FNR 24000 Lecture Notes - Lecture 14: Bighorn Sheep, Electrofishing, Inbreeding Depression
1 Oct 2018
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Standardize the approach to maintain conspiracy among sites. Passive capture methods-let wildlife come to you. Indirect(non-invasive) methods-use measures that indicate the presence of species (calls, feces, tracks, etc. ) Mammals, amphibians-funnel trap pitfall traps, box traps. Grill and trammel nets wedge and entangle fish. Mesh size targets particular size of fish. Multiple mesh sizes are needed to better represent the entire range of fish sizes. Float line and lead line stretch net vertically. Animals fly into nets and become entangled. Pitfall traps allo(cid:449) a(cid:374)i(cid:373)al to fall do(cid:449)(cid:374) (cid:271)ut they (cid:272)a(cid:374)"t (cid:272)li(cid:373)(cid:271) out. Dredges are towed to capture benthic species. Drive nets-animals forced into areas were nets are located. Drugs immobilize animals after capture by other methods. Reduce injury risk to animals and humans. With the animals in hand, you have some options. Together, these techniques can help us determine population size. Qualifying population size is the first step to preserving a species.
