A benthic net suitable for different wetland habitats and taking into account qualitative and quantitative collection

Abstract

The application discloses a benthic animal net suitable for different wetland habitats and considering qualitative and quantitative collection, and relates to the technical field of wetland benthic animal collection. The benthic animal net comprises a first U-shaped frame, a second U-shaped frame which is located above the first U-shaped frame and has the same size and shape as the first U-shaped frame, a connecting rod which is arranged at opposite ends of the first U-shaped frame to form a D-shaped frame, an adjusting device which is used for selectively fixing the first U-shaped frame and the second U-shaped frame to make the first U-shaped frame and the second U-shaped frame be arranged in close contact or vertically, a net bag whose head part covers the first U-shaped frame, the adjusting device and the connecting rod, and whose tail part is used for detachably connecting with a collecting net, and an operating handle which is arranged in the U-shaped middle part of the first U-shaped frame. The device is a sampling device which can simultaneously consider the static water and flowing water wetland habitats and the quantitative and qualitative collection of benthic animals.

Description

Technical Field

[0001] This invention relates to the field of benthic animal collection technology, and more specifically, to a benthic animal net suitable for different wetland habitats and capable of both qualitative and quantitative collection. Background Technology

[0002] Benthic animals refer to aquatic animal groups that live on the bottom of water bodies and are usually attached to the bottom substrate. The bottom of a water body includes the surface or interior of sediments, and the bottom substrate includes silt, rocks, debris, aquatic plants, driftwood, etc. Because they are relatively sensitive to environmental changes, they are often used as important bioindicator groups for water quality monitoring and ecological assessment. In different aquatic habitats, the composition of the bottom substrate varies significantly due to differences in water flow patterns.

[0003] In still-water wetland habitats, the substrate is mostly composed of fine sand or silt. Qualitative sampling is typically performed by dragging a D-shaped hand net along the substrate surface. In flowing-water wetland habitats, the substrate is mostly composed of larger particles such as gravel, and a Sober net is commonly used for quantitative sampling. The traditional D-shaped net is a common tool for sampling benthic animals in various freshwater habitats. Its basic structure includes a D-shaped frame, a collection net, and a handle. The D-shaped frame consists of a horizontal frame and an arc-shaped frame, forming an overall D shape. The collection net covers the frame, forming a sampling bag. The handle is attached to the arc-shaped frame for operation. Holding the handle, the D-shaped net is swept across different types of habitats to allow benthic animals to enter the net. The Sober net is a more commonly used device for quantitative sampling of benthic animals in flowing-water habitats such as wading rivers and streams. Its core structure consists of a quantitative sampling frame, a collection net bag, and a handle. The quantitative sampling principle of the Sober net is based on a sampling frame with a fixed area. During sampling, a quantitative sampling frame is placed close to the riverbed substrate, and the area defined by the frame is the sampling area. Within this fixed area, the substrate is disturbed, and the flowing water washes benthic animals attached to the substrate surface or inhabiting the riverbed into the collection net bag. The density of individuals per unit area can be calculated by dividing the total number of each species collected by the area of ​​the sampling frame.

[0004] Existing D-nets are effective for qualitative collection of benthic animals. Qualitative collection refers to collecting biological samples within a defined area, primarily to understand species composition rather than emphasizing precise quantitative statistics. However, they cannot achieve accurate quantitative collection, especially when quantitative collection of benthic animals attached to or inhabiting the substrate is required in flowing water habitats. While Sober nets can perform quantitative collection—collecting biological samples under known area or volume conditions to calculate density or biomass—their design is not ideal for collecting benthic animals attached to plants in still water wetland habitats.

[0005] In summary, how to provide a sampling net that can simultaneously collect both quantitative and qualitative samples of benthic animals and is convenient to use in both flowing and still wetland habitats is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] Therefore, the purpose of this invention is to provide a benthic animal net suitable for different wetland habitats and capable of both qualitative and quantitative sampling. It is a sampling device that can simultaneously collect both quantitative and qualitative benthic animals and is convenient to use in both flowing and still water habitats.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A benthic animal net suitable for different wetland habitats and capable of both qualitative and quantitative collection includes:

[0009] First U-shaped frame;

[0010] A second U-shaped frame is located above the first U-shaped frame, and the second U-shaped frame has the same size and shape as the first U-shaped frame;

[0011] Connecting rods are provided at opposite ends of the first U-shaped frame to form a D-shaped frame;

[0012] An adjustment device is used to selectively fix the first U-shaped frame and the second U-shaped frame so that the first U-shaped frame and the second U-shaped frame are fitted together or set vertically.

[0013] The head of the net covers the first U-shaped frame, the adjustment device, and the connecting rod, and the tail of the net is detachably connected to the collection net.

[0014] The operating handle is located in the middle of the U-shape of the first U-shaped frame.

[0015] In one embodiment, the adjusting device includes a limiting plate, a spring plunger buckle, and a connecting plate. The connecting plate has a first interface for fixed connection with the first U-shaped frame, a second interface for rotatable connection with the second U-shaped frame, a third interface for fixed connection with the connecting rod, and a fourth interface for mounting the spring plunger buckle. The limiting plate has a 0° limiting hole, a 90° limiting hole, and a fifth interface for rotatable connection with the second U-shaped frame. The rotating shaft passes through the second interface, the bottom of the second U-shaped frame, and the fifth interface in sequence.

[0016] When the spring plunger buckle passes through the fourth interface and is inserted into the 0° limiting hole, the first U-shaped frame and the second U-shaped frame are fitted and fixedly connected to qualitatively collect benthic animals in still or flowing water habitats; when the spring plunger buckle passes through the fourth interface and is inserted into the 90° limiting hole, the first U-shaped frame and the second U-shaped frame are vertically fixedly connected to quantitatively collect benthic animals in flowing water habitats.

[0017] In one embodiment, the spring plunger latch includes a housing fixedly disposed on the connecting piece, a columnar pin disposed through the housing, and a compression spring. The compression spring is used to reset the columnar pin along the axial direction of the housing, and the columnar pin is used to insert into the 0° limiting hole or the 90° limiting hole.

[0018] In one embodiment, the net bag is provided with an openable zipper, which facilitates the disassembly of the collection net to replace it with a collection net that meets different aperture requirements.

[0019] In one embodiment, silicone pads are provided on the lower side of the D-shaped frame and on the side of the second U-shaped frame away from the first U-shaped frame, and the silicone pads and the connecting rod are fixedly connected by bolts.

[0020] In one embodiment, the operating handle and the middle part of the U-shaped frame are detachably connected.

[0021] In one embodiment, a threaded sleeve is provided in the middle of the U-shape of the first U-shaped frame, and the operating handle and the threaded sleeve are threadedly connected.

[0022] In one embodiment, the operating handle includes at least two telescopically connected straight rods for collecting benthic animals in wetland habitats at different water depths.

[0023] In one embodiment, a hand grip is provided at the end of the straight rod located at the far end of the first U-shaped frame.

[0024] In one embodiment, the first U-shaped frame, the second U-shaped frame, the connecting rod, and the operating handle are all made of stainless steel.

[0025] When using the benthic animal collection net provided by this invention, which is suitable for different wetland habitats and can be used for both qualitative and quantitative collection, when the adjustment device selectively fixes the first U-shaped frame and the second U-shaped frame so that the first U-shaped frame and the second U-shaped frame are fitted together, the second U-shaped frame and the D-shaped frame overlap, forming a structure similar to a traditional D-shaped hand net. This facilitates qualitative collection in both flowing and still water environments. It can repeatedly sweep across the substrate and aquatic plant surface in different microhabitats to collect as many species as possible. It can qualitatively determine the species richness, dominance, diversity, and dominant species of benthic animals in a certain area, rather than precisely measuring the population density of each species or the biomass data per unit area.

[0026] When the regulating device selectively fixes the first U-shaped frame and the second U-shaped frame so that the first and second U-shaped frames are vertically arranged, quantitative sampling can be carried out in a flowing water habitat. The sampler can stir the bottom silt in the second U-shaped frame, and the silt is washed into the collection net by the water flow. The water flow then washes the benthic animals in the second U-shaped frame into the collection net. By dividing the number of each benthic animal group collected by the area of ​​the second U-shaped frame, the density or biomass per unit area of ​​each benthic animal group can be calculated. Based on this data, diversity indices such as the Shannon-Wiener index, the Simpson index, and evenness can be calculated. Among them, the Shannon-Wiener index and the Simpson index are classic indicators for measuring biodiversity in ecology. They not only focus on the number and richness of species in a community, but also on whether the distribution of the number of individuals of each species is even.

[0027] In summary, the benthic animal net provided by this invention is applicable to different wetland habitats and can be used for benthic animal collection in both still and flowing water habitats, while simultaneously enabling both quantitative and qualitative collection of benthic animals. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 A schematic diagram of a benthic animal collection net structure provided by the present invention, which is suitable for different wetland habitats and takes into account both qualitative and quantitative collection.

[0030] Figure 2 A schematic diagram of the structure for fitting the first U-shaped frame and the second U-shaped frame together;

[0031] Figure 3A schematic diagram of a structure in which the first U-shaped frame and the second U-shaped frame are arranged perpendicularly;

[0032] Figure 4 This is a schematic diagram of the connecting piece.

[0033] Figure 5 This is a schematic diagram of the limiting piece.

[0034] Figure 6 This is a schematic diagram of the spring plunger snap-fit ​​mechanism.

[0035] Figures 1-6 middle:

[0036] 1 is the first U-shaped frame, 2 is the second U-shaped frame, 3 is the connecting rod, 4 is the adjusting device, 41 is the limiting piece, 42 is the spring plunger buckle, 421 is the housing, 422 is the columnar pin, 43 is the fifth interface, 44 is the 0° limiting hole, 45 is the 90° limiting hole, 5 is the operating handle, 51 is the straight rod, 52 is the hand grip, 6 is the silicone pad, 7 is the threaded sleeve, 8 is the connecting piece, 81 is the first interface, 82 is the second interface, 83 is the third interface, 84 is the fourth interface, and 9 is the rotating shaft. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The core of this invention is to provide a benthic animal collection net suitable for different wetland habitats. It is a sampling net that can simultaneously collect both quantitative and qualitative benthic animals and is convenient to use in both flowing and still water habitats.

[0039] Please refer to Figures 1 to 3 This specific embodiment provides a benthic animal net suitable for different wetland habitats and capable of both qualitative and quantitative collection, including:

[0040] First U-shaped frame 1;

[0041] The second U-shaped frame 2 is located above the first U-shaped frame 1, and the second U-shaped frame 2 has the same size and shape as the first U-shaped frame 1;

[0042] Connecting rod 3 is located at opposite ends of the first U-shaped frame 1 to form a D-shaped frame;

[0043] Adjustment device 4 is used to selectively fix the first U-shaped frame 1 and the second U-shaped frame 2 so that the first U-shaped frame 1 and the second U-shaped frame 2 are fitted together or set vertically.

[0044] The head of the net covers the first U-shaped frame 1, the adjustment device 4 and the connecting rod 3, and the tail of the net is used for detachable connection with the collection net.

[0045] The operating handle 5 is located in the middle of the U-shape of the first U-shaped frame 1.

[0046] In practical applications, the shape, structure, type, and position of the first U-shaped frame 1, the second U-shaped frame 2, the connecting rod 3, the adjusting device 4, the net bag, and the operating handle 5 can be determined according to the actual situation and needs.

[0047] It should be noted that this application allows for rapid switching of collection modes depending on the collection objective. When using a benthic animal net suitable for different wetland habitats and capable of both qualitative and quantitative collection for qualitative sampling, the adjustment device 4 should be selectively fixedly connected to the first U-shaped frame 1 and the second U-shaped frame 2. Specifically, when the first U-shaped frame 1 and the second U-shaped frame 2 are fitted together, it functions as a hand-held net, suitable for qualitative collection of benthic animals in still or flowing water habitats. That is, investigators can use the fitted first U-shaped frame and second U-shaped frame to sweep and collect samples from the bottom layer of flowing and still water wetlands, the surface of aquatic vegetation, and the rhizosphere, thereby expanding the sample coverage and improving the species detection rate.

[0048] When using a benthic animal net suitable for different wetland habitats and capable of both qualitative and quantitative sampling for quantitative collection, the first U-shaped frame 1 and the second U-shaped frame 2 should be selectively fixed and connected via the adjusting device 4, ensuring that the first U-shaped frame 1 and the second U-shaped frame 2 are set perpendicularly. Together, the first U-shaped frame 1 and the second U-shaped frame 2 form a fixed-area quantitative sampling frame, suitable for quantitative sampling of benthic animals in flowing water habitats. In this configuration, the sampling structure formed by the first U-shaped frame 1 and the second U-shaped frame 2 has the largest water-facing area, clear quadrat boundaries, and can closely conform to the bottom of the sample plot. When using this device for sampling, the net opening should face the direction of the incoming water, i.e., be set up against the direction of water flow. The water flow will drive the benthic animals within the quadrat into the net, maximizing the retention of benthic animals within the quadrat and reducing the possibility of them escaping during sampling, thereby improving the accuracy and repeatability of the quantitative sampling results.

[0049] The adjustment device 4 allows for selective fixing of the first U-shaped frame 1 and the second U-shaped frame 2 according to the survey objectives, enabling switching between a fitted and vertical configuration. When sampling different habitat types to maximize the acquisition of local species, the first U-shaped frame 1 and the second U-shaped frame 2 can be fitted together to form a structure similar to a D-shaped hand net for qualitative sampling. When conducting quantitative surveys of benthic communities to obtain parameters such as benthic density, biomass, dominant species composition, and species diversity, the first U-shaped frame 1 and the second U-shaped frame 2 can be vertically positioned to form a structure similar to a Soap net for standardized sampling. This allows for rapid switching between two working states using the same device, meeting the different needs of qualitative and quantitative surveys of benthic animals in river wetlands without the need to carry and change different sampling tools, thus improving field survey efficiency. Furthermore, this application does not restrict the replacement of the net; surveyors can select and replace suitable nets according to on-site sampling conditions and actual needs, improving the adaptability and flexibility of sampling operations.

[0050] In summary, the benthic animal net provided by this invention is applicable to different wetland habitats and can be used for benthic animal collection in both still and flowing water habitats, while simultaneously enabling both quantitative and qualitative collection of benthic animals.

[0051] In one embodiment, the adjusting device 4 includes a limiting piece 41 (such as...). Figure 5 (as shown) and spring plunger clip 42 (as shown) Figure 6 (as shown) and connecting piece 8 (as shown) Figure 4 As shown, the connecting piece 8 has a first interface 81 for fixed connection with the first U-shaped frame 1, a second interface 82 for rotatable connection with one side of the second U-shaped frame 2, a third interface 83 for fixed connection with the connecting rod 3, and a fourth interface 84 for installing the spring plunger buckle 42; the limiting piece 41 has a 0° limiting hole 44, a 90° limiting hole 45, and a fifth interface 43 for rotatable connection with the other side of the second U-shaped frame 2, and the rotating shaft passes through the second interface 82, the bottom of the second U-shaped frame 2, and the fifth interface 43 in sequence; when the spring plunger buckle 42 passes through the fourth interface 84 and is inserted into the 0° limiting hole 44, the first U-shaped frame 1 and the second U-shaped frame 2 are fitted and fixedly connected; when the spring plunger buckle 42 passes through the fourth interface 84 and is inserted into the 90° limiting hole 45, the first U-shaped frame 1 and the second U-shaped frame 2 are vertically fixedly connected.

[0052] It should be noted that the structure of the limiting piece 41 is as follows: Figure 5As shown, the 0° limiting hole 44, the 90° limiting hole 45, and the fifth interface 43 can be triangularly distributed so that when the spring plunger buckle 42 passes through the fourth interface 84 and is inserted into the 0° limiting hole 44, the included angle between the second U-shaped frame 2 and the D-shaped frame is close to 0°, thereby enabling qualitative data collection in both flowing and still water environments, and facilitating carrying operations; when the spring plunger buckle 42 passes through the fourth interface 84 and is inserted into the 90° limiting hole 45, the included angle between the second U-shaped frame 2 and the D-shaped frame is close to 90°, thereby enabling quantitative data collection in both flowing and still water environments.

[0053] In one embodiment, the spring plunger latch 42 includes a housing 421 fixedly mounted on the connecting piece 8, a columnar pin 422 penetrating the housing 421, and a compression spring. The compression spring is used to axially reset the columnar pin 422 along the housing 421. The columnar pin 422 is used to insert into the 0° limiting hole 44 or the 90° limiting hole 45. A pull ring can be provided at the end of the columnar pin 422 to move it outward, disengaging the insertion end of the columnar pin 422 from the 0° limiting hole 44 or the 90° limiting hole 45. When the external force is removed, the columnar pin 422 can be inserted into the 0° limiting hole 44 or the 90° limiting hole 45 under the action of the compression spring.

[0054] By using the connecting piece 8, the limiting piece 41, and the spring plunger buckle 42, the components can rotate relative to each other without slipping or shifting. After locking, they are resistant to torsion and vibration, and will not loosen when used in the field. The entire process of tightening, locking, loosening, and disassembling can be completed with one hand.

[0055] In one embodiment, the net bag is equipped with an openable zipper, which facilitates the removal and replacement of the sampling net to meet different aperture requirements. In other words, the zipper allows for easy removal of sampling nets with different aperture requirements, improving sampling efficiency.

[0056] It should be noted that the outer edge of the first U-shaped frame is equipped with a mesh bag with a single-sided toothed chain strap and Velcro. The head of the mesh bag has a hook side and a rough side, which are adhered and fixed to the outer edge of the first U-shaped frame. The tail of the mesh bag is equipped with a single-sided toothed chain strap. The head of the collection net also has a single-sided toothed chain strap and a pull tab. The collection net and the mesh bag are detachably connected by two toothed chain straps and a pull tab to allow for the replacement of different models of collection nets. In one embodiment, silicone gaskets 6 are provided on the lower side of the D-shaped frame and on the side of the second U-shaped frame 2 away from the first U-shaped frame 1. The silicone gaskets 6 and the connecting rods 3 are fixedly connected by bolts.

[0057] It should be noted that a silicone strip is fixed to the lower side of the D-shaped frame and the side of the second U-shaped frame 2 away from the first U-shaped frame 1 by rivets. The silicone strip helps to improve the sealing between the components. When the skirt frame is pressed against the stone in the river water, it can maintain a tighter connection with the stone, so as to effectively prevent benthic animals from escaping from the bottom.

[0058] In one embodiment, the operating handle 5 and the middle of the U-shaped part of the first U-shaped frame 1 are detachably connected. When either the operating handle 5 or the first U-shaped frame 1 is damaged, the damaged part can be replaced by disassembly, and the new part and other undamaged parts can be assembled and used to improve the service life of the device and reduce the maintenance cost of the device.

[0059] In one embodiment, a threaded sleeve 7 is provided in the middle of the U-shape of the first U-shaped frame 1, and the operating handle 5 is threadedly connected to the threaded sleeve 7, which facilitates the disassembly and assembly of the first U-shaped frame 1 and the operating handle 5.

[0060] In one embodiment, the operating handle 5 includes at least two telescopically connected straight rods 51 for collecting benthic animals in wetland habitats at different water depths.

[0061] For example, multiple straight rods 51 can be set up in sequence. Fixing holes can be provided on the outer ring of straight rods 51, and compressible protrusions can be provided on the inner ring of straight rods 51. When the inner ring of straight rods 51 is extended or retracted to the desired position, the protrusions pop out and engage with the fixing holes to achieve the telescopic connection operation between the straight rods 51, so that the device can collect benthic animals in wetland habitats with different water depths.

[0062] In one embodiment, a handle 52 is provided at the end of the straight rod 51 at the far end of the first U-shaped frame 1, so that the operator can hold and control it to adjust the falling position of the net.

[0063] In one embodiment, the first U-shaped frame 1, the second U-shaped frame 2, the connecting rod 3, and the operating handle 5 are all made of stainless steel, which can ensure the lightweight nature of the device and avoid corrosion during use.

[0064] This application innovatively fixes the base of the net bag to the D-shaped frame with bolts, and provides a detachable zipper on the net bag for easy removal and installation of different types of collection nets. The handle 5 connecting to the first U-shaped frame 1 has a threaded sleeve 7 at its tip to increase its length. Furthermore, both the second U-shaped frame 2 and the D-shaped frame are hollow iron pipe frames. A ring of silicone gaskets 6 is fixed to the bottom of the second U-shaped frame 2 and the D-shaped frame with rivets, and an adjustment device 4 is provided at the connection between the second U-shaped frame 2 and the D-shaped frame. A limiting piece 41 and a spring plunger buckle 42 allow the second U-shaped frame 2 and the D-shaped frame to be vertically or flush.

[0065] It should be noted that the first U-shaped frame 1 and the second U-shaped frame 2, the 0° limiting hole 44 and the 90° limiting hole 45 mentioned in this application are only distinguished by their different positions and do not have any order of precedence.

[0066] In addition, it should be noted that the orientation or positional relationship indicated by "up and down" or "vertical" in this application is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the purpose of simplifying the description and making it easier to understand, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this invention is within the scope of protection of this invention and will not be elaborated upon here.

[0068] The foregoing has provided a detailed description of the benthic animal net provided by this invention, which is suitable for different wetland habitats and allows for both qualitative and quantitative collection. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A benthic animal net suitable for different wetland habitats and capable of both qualitative and quantitative collection, characterized in that, include: First U-shaped frame (1); The second U-shaped frame (2) is located above the first U-shaped frame (1), and the second U-shaped frame (2) has the same size and shape as the first U-shaped frame (1); Connecting rods (3) are located at opposite ends of the first U-shaped frame (1) to form a D-shaped frame; Adjustment device (4) is used to selectively fix the first U-shaped frame (1) and the second U-shaped frame (2) so that the first U-shaped frame (1) and the second U-shaped frame (2) are fitted together or set vertically; The net covers the first U-shaped frame (1), the adjusting device (4), and the connecting rod (3) at its head, and the tail of the net is detachably connected to the collection net. The operating handle (5) is located in the middle of the U-shape of the first U-shaped frame (1).

2. The benthic animal net according to claim 1, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... The adjusting device (4) includes a limiting piece (41), a spring plunger buckle (42), and a connecting piece (8). The connecting piece (8) has a first interface (81) for fixed connection with the first U-shaped frame (1), a second interface (82) for rotatable connection with one side of the second U-shaped frame (2), a third interface (83) for fixed connection with the connecting rod (3), and a fourth interface (84) for installing the spring plunger buckle (42). The limiting piece (41) has a 0° limiting hole (44), a 90° limiting hole (45), and a fifth interface (43) for rotatable connection with the other side of the second U-shaped frame (2). The rotating shaft passes through the second interface (82), the bottom of the second U-shaped frame (2), and the fifth interface (43) in sequence. When the spring plunger buckle (42) passes through the fourth interface (84) and is inserted into the 0° limiting hole (44), the first U-shaped frame (1) and the second U-shaped frame (2) are fitted and fixedly connected to qualitatively collect benthic animals in still or flowing water habitats; when the spring plunger buckle (42) passes through the fourth interface (84) and is inserted into the 90° limiting hole (45), the first U-shaped frame (1) and the second U-shaped frame (2) are vertically fixedly connected to quantitatively collect benthic animals in flowing water habitats.

3. The benthic animal net according to claim 2, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... The spring plunger buckle (42) includes a housing (421) fixed on the connecting piece (8), a columnar pin (422) passing through the housing (421), and a compression spring. The compression spring is used to reset the columnar pin (422) axially along the housing (421). The columnar pin (422) is used to insert into the 0° limiting hole (44) or the 90° limiting hole (45).

4. The benthic animal net according to any one of claims 1 to 3, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... The net bag is equipped with an openable zipper, which allows for easy disassembly of the collection net to replace it with a collection net that meets different aperture requirements.

5. The benthic animal net according to claim 4, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... Silicone gaskets (6) are provided on the lower side of the D-shaped frame and on the side of the second U-shaped frame (2) away from the first U-shaped frame (1). The silicone gaskets (6) and the connecting rod (3) are fixedly connected by bolts.

6. The benthic animal net according to any one of claims 1 to 3, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... The operating handle (5) and the middle part of the first U-shaped frame (1) are detachably connected.

7. The benthic animal net according to claim 6, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... The first U-shaped frame (1) has a threaded sleeve (7) in the middle of the U-shape, and the operating handle (5) and the threaded sleeve (7) are threadedly connected.

8. The benthic animal net according to claim 7, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... The operating handle (5) includes at least two telescopically connected straight rods (51) for collecting benthic animals in wetland habitats at different water depths.

9. The benthic animal net according to claim 8, suitable for different wetland habitats and capable of both qualitative and quantitative collection, is characterized in that... A hand grip (52) is provided at the end of the straight rod (51) at the far end of the first U-shaped frame (1).

10. The benthic animal net according to any one of claims 1 to 3, suitable for different wetland habitats and capable of both qualitative and quantitative collection, characterized in that... The first U-shaped frame (1), the second U-shaped frame (2), the connecting rod (3) and the operating handle (5) are all made of stainless steel.

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