A method and apparatus for assessing the potential for recovery of a harvest-controlled spotted seal population

Abstract

The application discloses a kind of control fishing yield seal population recovery potential evaluation method and device, it is related to marine ecological protection and restoration field, mainly includes: four steps of modeling, predation rate calculation, fishing quantity reduction stage determination and seal population recovery potential evaluation.The application is based on Ecopath model, by introducing predation rate parameter, dynamically adjusts seal food habit matrix, reduces the data requirement of modeling, realizes the quantitative evaluation of fishing control measure protection benefit, provides practical method tool for seal population recovery potential evaluation.Therefore the seal population recovery potential evaluation method and device based on control fishing yield provided by the application have good seal population recovery potential evaluation ability, and can be widely applied to marine biological population resource recovery potential evaluation field.

Description

Technical Field

[0001] This application relates to the field of marine ecological protection and restoration, specifically to a method and apparatus for assessing the population recovery potential of spotted seals by controlling catch volume. Background Technology

[0002] This section is intended to provide background or context for the content set forth in the claims or specification, and the content described herein is not acknowledged as prior art simply because it is included in this section.

[0003] As the only pinniped species that breeds in my country's waters, the spotted seal is a Class I protected wild animal in China and one of only two marine species among the major umbrella seal / flagship species, making it of significant conservation importance. However, human activities, particularly fishing, have had multifaceted impacts on the spotted seal's life processes. Therefore, current high-intensity fishing activities cannot meet the conservation needs of the spotted seal. Scientifically assessing the recovery potential of the spotted seal population in response to different fishing control measures is a prerequisite for formulating fishing control measures based on the conservation needs of the spotted seal.

[0004] Assessing the recovery potential of marine biological populations faces unique challenges. Traditional analytical methods, such as quantitative surveys, sampling surveys, niche models, and systematic conservation planning, struggle to accurately reveal energy flow relationships at the ecosystem level, including those of spotted seals and fishery-caught species. The EwE model (Ecopath with Ecosim) constructs a complete food web from primary producers to apex predators, quantifying energy flow pathways and providing two approaches for assessing the recovery potential of marine biological populations. One approach, the traditional ecological capacity method, assesses the ecological capacity of target species in different aquatic ecosystems based on the Ecopath model. The other approach, the Ecosim method, utilizes the Ecosim model to assess the impact of different scenarios and external disturbances (such as fishing) on ​​ecosystems and marine biological biomass.

[0005] The inventors of this application discovered in their research that traditional ecological carrying capacity methods cannot assess the population recovery potential of species under superimposed external disturbances (such as changes in catch rates). While the Ecosim method can dynamically simulate external disturbances and better reproduce the reality of the ecosystem, its high data requirements (such as time series parameters) make it difficult to apply in areas with insufficient monitoring data. Against this backdrop, how to construct a technical framework for assessing the population recovery potential of marine biological resources using limited monitoring data, simulate the population recovery potential of marine organisms under external disturbances, and develop a dynamic assessment method with low data requirements and high ecological fidelity has become a potential research direction for assessing the recovery potential of marine biological population resources. Of course, similar problems exist for other marine species, such as the Yangtze finless porpoise and the Indo-Pacific humpback dolphin.

[0006] There is currently no effective solution to the above problems. Summary of the Invention

[0007] This application provides a method and apparatus for assessing the recovery potential of spotted seal populations by controlling catch volume, thereby at least solving the technical problem in related technologies that cannot assess the recovery potential of marine biological populations.

[0008] According to one aspect of the embodiments of this application, a method for assessing the population recovery potential of spotted seals under controlled catch limits is provided, comprising:

[0009] Step 1: Collect biological and ecological data of various species in the research area, as well as data on fishery species and catch volume. Divide each species into functional groups, construct a diet matrix, establish an Ecopath model, and test the model.

[0010] Step 2: Screen the predator functional groups of the restricted bait organism functional groups, calculate the predation rate of each predator functional group, obtain the average predation rate of the predator functional groups on the restricted bait organism functional groups, and determine the proportion of predation by the predator functional groups in the reduced catch of restricted bait organism functional groups.

[0011] Step 3: Estimate the ecological carrying capacity of predator functional groups. Based on the proportion of consumption of the limited prey organism functional group by each predator functional group, allocate the portion of the reduced prey organism catch from the prey organism functional group to each predator functional group. This process continues until a predator functional group reaches its maximum consumption of the limited prey organism functional group, which constitutes one stage. In the next stage, the predator functional group will no longer increase its consumption. This process continues until the catch of the limited prey organism functional group drops to 0.

[0012] Step 4: Based on the new consumption and new diet matrix of spotted seals after the reduction of prey catch, calculate the population recovery potential and recovery efficiency of spotted seals after the reduction of prey catch in each stage.

[0013] Furthermore, in step 1, the biological ecological data includes: biomass, production / biomass, and consumption / biomass of each species.

[0014] Furthermore, in step 1, the species are divided into functional groups, including: first, species with similar habitat layers and ecological habits are grouped into the same functional group; then, the spotted seal, the known food species of the spotted seal, and the main fishery resources in the study area are listed separately as functional groups for a single species.

[0015] Furthermore, in step 2, the limited prey organism functional group is the prey organism functional group of the captured spotted seals.

[0016] Further, in step 2, the predation rate of each predator functional group is calculated, including: calculating the predation rate based on the relevant parameters (a) output by the Ecopath model. ij v ij B i B j ), calculate the predation rate of each predator functional group on the limited prey organism functional group:

[0017] V ij =v ij B i / (2v ij +a ij B j ),

[0018] V ij % = V ij / B i ,

[0019] Among them, a ij B represents the instantaneous mortality rate per unit biomass of predator functional group j on prey-limiting functional group i. i B represents the biomass of functional group i of limited prey organisms. j This represents the biomass of predator functional group j. In the Ecopath model, the biomass (B) of each functional group is divided into two parts: one part being vulnerable predators (V). i The other part is that they are not easily preyed upon (BV). i ), v of each predator functional group ij Setting all values ​​to 2 indicates that the Ecopath model is a hybrid control mode, where the ecosystem is controlled by both upward and downward forces.

[0020] Furthermore, in step 3, estimating the ecological capacity of the predator functional group includes: continuously increasing the biomass of the functional group whose ecological capacity is to be acquired without changing the biomass of the functional group other than the ecological capacity to be acquired in the Ecopath model; when the biomass of the functional group whose ecological capacity is to be acquired increases to EE≥1 for any functional group, the biomass of the functional group whose ecological capacity is to be acquired at this time is taken as its ecological capacity.

[0021] Further, in step 4, the new diet matrix includes updating the diet matrix in the following manner: based on the new consumption Q′ of the predator functional group after the reduction of the catch of the limited prey biological functional group in each stage. j The diet matrix DC′ of the predator functional group is adjusted according to the following formula. ij :

[0022] From the formula get In the formula, Qj Q is the total consumption of predator functional group j, n is the number of prey functional groups, and Q is the total consumption of predator functional group j. ij It represents the amount of food consumed by predator functional group j in relation to prey functional group i, (Q / B). j It is the consumption / biomass of predator functional group j, DC′ ij It is the proportion of the total consumption of prey organism functional group i to the total consumption of predator functional group j;

[0023] Subsequently, based on the reduction in catch volume of each predator functional group within the restricted-prey functional group at each stage, the new consumption amount Q′ of each predator functional group on the restricted-prey functional group is calculated. ij Q′ of total consumption j Proportional calculation of the new diet matrix DC′ for predator functional groups ij :

[0024] Furthermore, in step 4, the recovery potential also includes calculating the recovery potential of spotted seals after the reduction in catch volume of each stage of the limited prey organism functional group as follows: based on the new consumption Q′ of spotted seals after the reduction in catch volume of the limited prey organism functional group. j and the updated diet matrix DC′ ij The biomass B′ of spotted seals after the reduction in catch was calculated. j :

[0025] B′ j This indicates the potential for the recovery of spotted seal populations.

[0026] Further, in step 4, the recovery efficiency includes calculating the recovery efficiency of the spotted seal after each stage of reduced prey catch as follows: based on the recovery amount (ΔB) of predator functional group j. j The reduction in catch (ΔL) of the functional group i of restricted bait organisms i )Calculate the recovery efficiency (RE) of the spotted seal:

[0027]

[0028] According to another aspect of the embodiments of this application, a device for assessing the recovery potential of spotted seal populations by controlling catch volume is also provided, including: a construction and verification module, a calculation module, a simulation module, and an assessment module.

[0029] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided, the storage medium including a stored program that executes the above-described method when the program is run.

[0030] According to another aspect of the embodiments of this application, an electronic device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor performs the above-described method through the computer program.

[0031] According to one aspect of this application, a computer program product or computer program is provided, comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the steps of any of the embodiments of the methods described above.

[0032] Compared to existing technologies, this invention, based on the Ecopath model, introduces a predation rate parameter to dynamically adjust the spotted seal diet matrix, reducing the data requirements for modeling and enabling a quantitative assessment of the conservation benefits of fishing control measures. This provides a practical method and tool for assessing the potential for spotted seal population recovery. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0034] Figure 1 This is a flowchart of an optional method for assessing the population recovery potential of spotted seals with controlled catch according to an embodiment of this application;

[0035] Figure 2 This is a schematic diagram of an optional scheme for assessing the recovery potential of spotted seal populations by controlling catch volume, according to an embodiment of this application.

[0036] Figure 3 This is a schematic diagram of an optional method for reducing anchovy catch according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of an optional method for reducing anchovy catch according to an embodiment of this application;

[0038] Figure 5 This is a schematic diagram of an optional spotted seal population recovery potential assessment device for controlling catch volume according to an embodiment of this application; and,

[0039] Figure 6 This is a structural block diagram of a terminal according to an embodiment of this application. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] According to one aspect of the embodiments of this application, a method embodiment for assessing the recovery potential of spotted seal populations by controlling catch volume is provided. Figure 1 This is a flowchart of an optional method for assessing the population recovery potential of spotted seals with controlled catches, according to an embodiment of this application. Figure 1 As shown, the method may include the following steps:

[0043] Step 1: Collect biological and ecological data of various species in the research area, as well as data on fishery species and catch volume. Divide each species into functional groups, construct a diet matrix, establish the Ecopath model, and perform model validation.

[0044] Biological and ecological data include: biomass, production / biomass, and consumption / biomass for each species; functional grouping of each species includes: first, classifying species with similar habitat layers and ecological habits into the same functional group; then, listing the spotted seal, the known food species of the spotted seal, and the main fishery resources in the study area separately as functional groups for individual species.

[0045] Step 2: Screen the predator functional groups of the restricted bait organism functional groups, calculate the predation rate of each predator functional group, obtain the average predation rate of the predator functional groups on the restricted bait organism functional groups, and determine the proportion of predation by the predator functional groups in the reduced catch of restricted bait organism functional groups.

[0046] The restricted prey organism functional group is the prey organism functional group of the spotted seals that have been caught.

[0047] Based on the parameters related to predation rate calculated from the Ecopath model output (a) ij v ij B i B j ), calculate the predation rate of each predator functional group on the limited prey organism functional group:

[0048] V ij =v ij B i / (2v ij +a ij B j ),

[0049] V ij % = V ij / B i ,

[0050] Among them, a ij B represents the instantaneous mortality rate per unit biomass of predator functional group j on prey-limiting functional group i. i B represents the biomass of functional group i of limited prey organisms. j This represents the biomass of predator functional group j. In the Ecopath model, the biomass (B) of each functional group is divided into two parts: one part is the biomass of the vulnerable predator (V). i The other part is that they are not easily preyed upon (BV). i ), v of each predator functional group ij Setting all values ​​to 2 indicates that the Ecopath model is a hybrid control mode, where the ecosystem is controlled by both upward and downward forces.

[0051] Step 3: Estimate the ecological carrying capacity of the predator functional group. Based on the proportion of consumption of the limited prey organism functional group by each predator functional group, allocate the portion of the reduced prey organism catch from the prey organism functional group to each predator functional group. This process continues until a certain predator functional group reaches its maximum consumption of the limited prey organism functional group, which constitutes one stage. In the next stage, the predator functional group will no longer increase its consumption. This process continues until the catch of the limited prey organism functional group drops to 0.

[0052] Without changing the biomass of functional groups other than the ecological capacity to be acquired in the Ecopath model, the biomass of the functional groups for which the ecological capacity to be acquired is continuously increased. When the biomass of the functional group for which the ecological capacity to be acquired is increased to EE≥1 for any functional group, the biomass of the functional group for which the ecological capacity to be acquired is taken as its ecological capacity.

[0053] Step 4: Based on the new consumption and new diet matrix of spotted seals after the reduction of prey catch, calculate the population recovery potential and recovery efficiency of spotted seals after the reduction of prey catch in each stage.

[0054] The diet matrix can be updated as follows: based on the new consumption Q' of the predator functional group after the reduction in the catch of the limited prey organism functional group in each stage. j The diet matrix DC of the predator functional group is adjusted according to the following formula. ij From the formula get In the formula, Q j Q is the total consumption of predator functional group j, n is the number of prey functional groups, and Q is the total consumption of predator functional group j. ij It represents the amount of food consumed by predator functional group j in relation to prey functional group i, (Q / B). j It is the consumption / biomass of predator functional group j, DC ij It is the proportion of the total consumption of prey organism functional group i to the total consumption of predator functional group j; then, based on the reduction of the catch of prey organism functional groups in each stage, the new consumption Q′ of each predator functional group on the prey organism functional group. ij Q′ of total consumption j Proportional calculation of the new diet matrix DC′ for predator functional groups ij :

[0055] The recovery potential of spotted seals after each stage of reduced prey catch was calculated as follows: based on the new consumption Q′ of spotted seals after the reduction of prey catch for each functional group of restricted prey. j and the updated diet matrix DC ij The biomass B′ of spotted seals after the reduction in catch was calculated. j B′ j This indicates the potential for the recovery of spotted seal populations.

[0056] The recovery efficiency of spotted seals after each stage of reduced prey catch was calculated as follows: based on the recovery amount ΔB of predator functional group j. j The reduction in catch ΔL of bait organism functional group i i Calculate the recovery efficiency (RE) of the spotted seal:

[0057] The following combination Figure 2-4 Further details of the implementation scheme of this application:

[0058] Figure 2 A scheme for assessing the recovery potential of spotted seal populations under controlled catch measures is presented, comprising the following steps:

[0059] Step 1: Fish biomass data primarily comes from the report "Basic Survey of Environment and Resources in Changdao" compiled by the Shandong Institute of Marine Resources and Environment, provided by the Changdao National Park Management Center. Biomass data for other functional groups are derived from empirical equations. Production / biomass and consumption / biomass for fish functional groups are obtained from the life history tool of Fishbase (https: / / fishbase.org / ). Other species data are obtained based on relevant literature. This embodiment divides the Changdao marine ecosystem into 31 functional groups (see Table 1), with spotted seals, reported spotted seal prey species, and major fishery resources in the Changdao waters listed separately as functional groups. In this embodiment, the diet data for each species mainly comes from stomach contents analysis and stable isotope analysis. The spotted seal diet data is adjusted from the biologically classified Bering Sea spotted seal diet data to the ecologically functional classification diet data. Finally, the Changdao spotted seal diet data is obtained based on the proportion of biomass in each functional group to the biomass of the same ecological functional group in the Changdao marine Ecopath model. Fisheries data are from the Fisheries Statistical Yearbook of the Changdao Marine Ecological Civilization Comprehensive Experimental Zone (2016-2020).

[0060] Table 1. Functional groups and main species composition of the Ecopath model of the Changdao marine ecosystem.

[0061]

[0062]

[0063] Step 2: The assessment process is illustrated using the impact of controlled anchovy catches on the recovery potential of spotted seal populations as an example. First, predator functional groups for anchovies in the Changdao waters were screened, including 11 functional groups such as spotted seals, finless porpoises, and cartilaginous fish. Then, the predation rate of each predator functional group on anchovies was calculated, yielding an average predation rate of 47.86%, meaning that 47.86% of the reduced anchovy catch's resources and energy were obtained from predation (see Table 2).

[0064] Table 2. Predation rates of various predators on anchovies in the waters off Changdao Island.

[0065]

[0066] Step 3: Estimate the ecological carrying capacity of the anchovy predator functional groups (see Table 3). Based on the proportion of consumption of the limited prey organism functional group by each predator functional group, allocate the prey portion of the reduced prey organism catch to each predator functional group. During the simulated reduction of anchovy catch, the squid first reaches its maximum consumption of anchovies, marking the first stage of anchovy catch reduction. As anchovy catch further decreases, other cephalopods reach their maximum consumption of anchovies, marking the second stage of anchovy catch reduction. This process continues until the anchovy catch reaches zero. The results show that there are a total of 11 stages when the anchovy catch decreases to zero (see Table 4).

[0067] Table 3. Ecological carrying capacity and maximum consumption of anchovy predators in the waters off Changdao Island (unit: t / km²) 2 )

[0068] Predator Functional Group Current biomass Ecological capacity Maximum consumption of anchovies Yangtze finless porpoise 0.0246 0.0327 0.0729 Cartilaginous fish 0.0189 0.1028 0.0055 Blue-spotted mackerel 0.0065 0.0193 0.0686 mackerel 0.0053 0.0110 0.0863 Bottom-feeding fish 0.0439 0.0579 0.0332 Small yellow croaker 0.0220 0.0280 0.0066 Other bottom-dwelling, generalist fish 0.0300 0.0384 0.1065 Other bottom-feeding crustaceans 0.0508 0.0666 0.0306 Squid 0.1399 0.1477 0.1912 Other cephalopods 0.1205 0.1448 0.1470

[0069] Table 4. Stages of Anchovy Catch Decline (Unit: t / km) 2 )

[0070]

[0071] Step 4: Based on the new consumption of spotted seals after the reduction in anchovy catch in each stage (Q' j Adjust its diet matrix (DC) ij The population recovery potential of spotted seals after the reduction in anchovy catch at each stage was calculated (see Table 5). This embodiment followed the assessment methods and procedures for the recovery potential of spotted seal populations after the reduction in anchovy catch, and also assessed the recovery potential of spotted seal populations after the reduction in catches of other prey organisms. The population recovery potential of spotted seals was greatest after the reduction in anchovy catch, with the maximum possible recovery of spotted seal biomass to 0.02171 t / km². 2 (Approximately 1281 individuals), which is 3.18 times the current population size, representing a recovery of 0.01488 t / km². 2 (Approximately 878 individuals), far exceeding the benefits of reduced catches from other prey organisms for the recovery of spotted seal populations (see Table 6). The reduction in silver pomfret catches resulted in the highest recovery efficiency for spotted seal populations (1.74%), followed by anchovies (1.52%); the recovery efficiency from invertebrates and crustaceans was lower. This embodiment assessed not only the recovery potential of spotted seals but also the recovery potential of marine biodiversity in the Changdao waters, i.e., the umbrella effect of spotted seal conservation. The reduction in anchovy catches could potentially restore marine biodiversity in the Changdao waters by up to 0.02526 t / km². 2 The total is approximately 89.46 tons (see Table 7).

[0072] Traditional ecological carrying capacity methods for assessing the population recovery potential of spotted seals only consider spotted seals as the conservation target, resulting in a population recovery potential of 0.010051 t / km². 2 (Approximately 887 heads), recovery rate is 0.003185 t / km 2 (Approximately 284 individuals). The assessment method used in this embodiment improved the recovery potential of the spotted seal population by 209% compared to the traditional ecological carrying capacity method, indicating that the recovery potential of the spotted seal population was significantly enhanced after the superimposed protection of food organisms. At the same time, the umbrella effect of spotted seal protection was also assessed.

[0073] Table 5. Population recovery potential of spotted seals affected by reduced anchovy catch at each stage (unit: t / km) 2 )

[0074]

[0075] Table 6 Summary of the assessment results of the recovery potential of spotted seal population in the waters off Changdao Island (Unit: t / km) 2 )

[0076]

[0077] Table 7. Benefits of reduced anchovy catch on the restoration of biological resources in the Changdao waters (unit: t / km²) 2 )

[0078]

[0079] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0080] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0081] According to another aspect of the embodiments of this application, a device for assessing the population recovery potential of spotted seals with controlled catches is also provided for implementing the above-described method for assessing the population recovery potential of spotted seals with controlled catches. Figure 5 This is a schematic diagram of an optional spotted seal population recovery potential assessment device according to an embodiment of this application, such as... Figure 5 As shown, the device may include:

[0082] The module includes a construction and verification module 51, a calculation module 53, a simulation module 55, and an evaluation module 57.

[0083] According to another aspect of the embodiments of this application, a server or terminal is also provided for implementing the above-described method for assessing the population recovery potential of spotted seals by controlling catch volume.

[0084] Figure 6 This is a structural block diagram of a terminal according to an embodiment of this application, such as... Figure 6 As shown, the terminal may include: one or more (only one is shown in the figure) processors 601, memory 603, and transmission devices 605, such as... Figure 6 As shown, the terminal may also include input / output devices 607.

[0085] The memory 603 can be used to store software programs and modules, such as the program instructions / modules corresponding to the method and apparatus for assessing the recovery potential of spotted seal populations under controlled catch limits in this embodiment of the application. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory 603, thereby realizing the aforementioned method for assessing the recovery potential of spotted seal populations under controlled catch limits. The memory 603 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 603 may further include memory remotely located relative to the processor 601, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0086] The aforementioned transmission device 605 is used to receive or send data via a network, and can also be used for data transfer between the processor and memory. Specific examples of the network described above may include wired networks and wireless networks. In one example, the transmission device 605 includes a Network Interface Controller (NIC), which can be connected to other network devices and a router via a network cable to communicate with the Internet or a local area network. In another example, the transmission device 605 is a radio frequency (RF) module used for wireless communication with the Internet.

[0087] Specifically, memory 603 is used to store application programs.

[0088] The processor 601 can invoke the application program stored in the memory 603 via the transmission device 605 to perform the following steps:

[0089] Step 1: Collect biological and ecological data of various species in the research area, as well as data on fishery species and catch volume. Divide each species into functional groups, construct a diet matrix, establish an Ecopath model, and test the model.

[0090] Step 2: Screen the predator functional groups of the restricted bait organism functional groups, calculate the predation rate of each predator functional group, obtain the average predation rate of the predator functional groups on the restricted bait organism functional groups, and determine the proportion of predation by the predator functional groups in the reduced catch of restricted bait organism functional groups.

[0091] Step 3: Estimate the ecological carrying capacity of predator functional groups. Based on the proportion of consumption of the limited prey organism functional group by each predator functional group, allocate the portion of the reduced prey organism catch from the prey organism functional group to each predator functional group. This process continues until a predator functional group reaches its maximum consumption of the limited prey organism functional group, which constitutes one stage. In the next stage, the predator functional group will no longer increase its consumption. This process continues until the catch of the limited prey organism functional group drops to 0.

[0092] Step 4: Based on the new consumption and new diet matrix of spotted seals after the reduction of prey catch, calculate the population recovery potential and recovery efficiency of spotted seals after the reduction of prey catch in each stage.

[0093] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0094] Those skilled in the art will understand that Figure 6The structure shown is for illustrative purposes only. The terminal can be a smartphone (such as an Android phone, an iOS phone, etc.), a tablet computer, a PDA, a mobile internet device (MID), a PAD, or other terminal devices. Figure 6 This does not limit the structure of the aforementioned electronic device. For example, the terminal may also include components that are more... Figure 6 The more or fewer components shown (such as network interfaces, display devices, etc.), or having the same Figure 6 The different configurations shown.

[0095] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a computer-readable storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0096] Embodiments of this application also provide a storage medium. Optionally, in this embodiment, the storage medium can be used to execute program code for a method for assessing the population recovery potential of fish catches.

[0097] Optionally, in this embodiment, the storage medium may be located on at least one of the network devices in the network shown in the above embodiment.

[0098] Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:

[0099] Biological and ecological data of various species in the research area, as well as data on fishery catches and quantities, were collected. Each species was divided into functional groups, a diet matrix was constructed, an Ecopath model was established, and the model was validated. Predator functional groups within the restricted bait organism functional groups were screened, and the predation rate of each predator functional group was calculated. The average predation rate of each predator functional group on the restricted bait organism functional group was obtained, and the proportion of predation by the predator functional group within the reduced catch of the restricted bait organism functional group was determined. The ecological carrying capacity of each predator functional group was estimated, and the ecological carrying capacity of each predator functional group was determined based on its predation rate on the restricted bait organism functional group. The consumption ratio of the limited prey organism functional group is determined by allocating the portion of the reduced prey organism catch from the limited prey organism functional group to each predator functional group. This process continues until a predator functional group reaches its maximum consumption of the limited prey organism functional group, which constitutes one stage. In the next stage, that predator functional group no longer increases its consumption, and so on, until the catch of the limited prey organism functional group drops to 0. Based on the new consumption and new diet matrix of the spotted seals after the reduction in prey organism catch, the population recovery potential and recovery efficiency of the spotted seals after the reduction in prey organism catch in each stage are calculated.

[0100] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0101] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0102] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0103] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0104] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0105] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0106] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0107] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0108] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for assessing the population recovery potential of spotted seals under controlled catch conditions, characterized in that, include: Step 1: Collect biological and ecological data of various species in the research area, as well as data on fishery species and catch volume. Divide each species into functional groups, construct a diet matrix, establish an Ecopath model, and test the model. In step 1, the species are divided into functional groups, including: first, species with similar habitat layers and ecological habits are grouped into the same functional group; then, the spotted seal, the known food species of the spotted seal, and the main fishery resources in the study area are listed separately as functional groups for individual species. Step 2: Screen the predator functional groups of the limited prey organism functional groups, calculate the predation rate of each predator functional group, obtain the average predation rate of the predator functional groups on the limited prey organism functional groups, and determine the proportion of predation by the predator functional groups in the reduced catch of the limited prey organism functional groups; in Step 2, the calculation of the predation rate of each predator functional group includes: calculating the predation rate based on the relevant parameters output by the Ecopath model ( a ij , v ij , , ), calculate the predation rate of each predator functional group on the limited prey organism functional group: ， ， in, a ij Indicates the predator functional group j The effect of unit biomass on the functional group of limited prey organisms i The resulting instantaneous mortality rate, Indicates the functional group of limited bait organisms i biomass, Indicates the predator functional group j Biomass, the biomass of each functional group in the Ecopath model It is divided into two parts, one of which is vulnerable to predation. The other part is that they are not easily preyed upon. - ), each predator functional group v ij All values ​​are set to 2, indicating that the Ecopath model is a hybrid control mode, where the ecosystem is controlled by both upward and downward forces. Step 3: Estimate the ecological carrying capacity of predator functional groups. Based on the proportion of consumption of the limited prey organism functional group by each predator functional group, allocate the portion of the reduced prey organism catch from the limited prey organism functional group to each predator functional group until a certain predator functional group reaches its maximum consumption of the limited prey organism functional group, entering a new phase. In the next phase, that predator functional group will no longer increase its consumption, and so on, until the catch of the limited prey organism functional group drops to 0. In Step 3, estimating the ecological carrying capacity of the predator functional group includes: Without changing the biomass of the functional groups other than the ecological capacity to be acquired in the Ecopath model, the biomass of the functional groups of the ecological capacity to be acquired is continuously increased. When the biomass of the functional groups of the ecological capacity to be acquired is increased to EE≥1 for any functional group, the biomass of the functional groups of the ecological capacity to be acquired at this time is taken as its ecological capacity. Step 4: Based on the new consumption and new diet matrix of spotted seals after the reduction of prey catch, calculate the population recovery potential and recovery efficiency of spotted seals after the reduction of prey catch in each stage. In step 4, the diet matrix is ​​updated as follows: Based on the new consumption of the predator functional group after the reduction of the catch of the limited prey biological functional group in each stage. Q ’ j Adjust the diet matrix of the predator functional group according to the following formula. : From the formula ,get In the formula, It is the predator functional group j Total consumption, n It refers to the number of functional groups of the bait organisms. It is the predator functional group j Functional groups of feed organisms i Consumption amount, It is the predator functional group j Consumption / Biomass It is the functional group of bait organisms i Predator functional group j The proportion of total consumption; Subsequently, based on the reduction in catch volume of each predator functional group within the restricted-prey functional group at each stage, the new consumption of the restricted-prey functional group by each predator functional group was determined. Percentage of total consumption Proportional calculation of predator functional groups and new diet matrix : ; In step 4, the recovery potential of spotted seals after the reduction in catch of each stage of the restricted prey organism functional group is calculated as follows: New consumption of spotted seals after reduction in catch volume based on the functional group of restricted bait organisms. and the updated diet matrix The biomass of spotted seals after the reduction in catch was calculated. : , This indicates the potential for the recovery of spotted seal populations; In step 4, the recovery efficiency of the spotted seals after the reduction in the catch of limited prey organisms at each stage is calculated as follows: According to predator functional groups j Recovery amount ( ) and the functional group of limited bait organisms i The reduction in fishing ( Calculate the recovery efficiency of spotted seals. : 。 2. The method according to claim 1, characterized in that, In step 1, the biological ecological data includes: biomass, production / biomass, and consumption / biomass of each species.

3. The method according to claim 1, characterized in that, In step 2, the limited-hunting prey organism functional group is the prey organism functional group of the captured spotted seals.

4. An apparatus for implementing the method for assessing the population recovery potential of spotted seals by controlling catch volume as described in claim 1, characterized in that, The device includes: The construction and verification module is used to collect biological and ecological data of various species in the research sea area, fishery species and catch data, classify each species into functional groups, construct a diet matrix, establish an Ecopath model and verify the model. The calculation module is used to screen the predator functional groups of the restricted bait organism functional groups, calculate the predation rate of each predator functional group, obtain the average predation rate of the predator functional groups on the restricted bait organism functional groups, and determine the proportion of predation by the predator functional groups in the reduced catch of restricted bait organism functional groups. The simulation module is used to estimate the ecological carrying capacity of predator functional groups. Based on the proportion of consumption of the limited prey organism functional group by each predator functional group, the portion of the reduced catch of the prey organism functional group is allocated to each predator functional group. This continues until a certain predator functional group reaches its maximum consumption of the limited prey organism functional group, at which point a phase begins. In the next phase, that predator functional group no longer increases its consumption, and this process continues until the catch of the limited prey organism functional group drops to zero. The assessment module is used to calculate the population recovery potential and recovery efficiency of spotted seals after each stage of reduced prey catch, based on the new consumption and new diet matrix of the prey catch.

Images