Aquatic Invertebrates of Montana
Some advantages of collecting with traps
- Traps are more unbiased than human collectors.
- Traps can be designed, set and baited to target certain taxa.
- Traps can be replicated and used in experiments.
- Traps can provide some quality control for hand collecting methods.
- Traps integrate over time and might see rare or short lived species.
- Traps patiently wait for favorable weather conditions even when rare.
- Traps can provide clean samples that require little sorting.
- Traps are generally inexpensive.
- Traps can collect from even sensitive habitats with little impact on the area.
Some disadvantages of collecting with traps
- The samples can be lost due to trap destruction by the elements, animals or vandals.
- The traps may take some non-target taxa including rare or endangered species.
- The catch is not related only to organism density, but to density and species specific catchability.
- The trap catch may be smaller or larger than desired for analyses.
Some types of traps useful for collecting aquatic invertebrates
- Bottle traps
- Light traps
- Drift nets
- Emergence traps
- Sticky traps
- Lindgren Funnel trap
- Pitfall traps
22 MAR 1996 D.L. Gustafson