Use of Track Stations to Index Abundance of Sciurids

摘要: We developed rainproof track stations to index sciurid abundance. Track were effective at detecting presence of a species and provided useful abundance in two validation efforts. In the more rigorous validation, we documented correlation indices (our catch-per-unit-effort, CPUE) with population size Abert's squirrels ( Sciurus aberti ) as estimated by mark-recapture methods on eight 60-ha plots April August 1996. The (number visited) was correlated highly both r = 0.983) 0.924). CPUE, measured cumulative number captured first day 2 days trapping effort, performed well 0.905 0.945 August) index. also examined between these for chipmunks Tamias ), golden-mantled ground Spermophilus lateralis rock S. variegatus double-sampling 30 (2.25 ha each) diurnal sciurids 1994 1995. CPUE 0.815), 0.881), 0.868), 0.926). Similarity regression slopes suggested that valid across seasons. Both trap less powerful statistically than estimates differences among seasons but did detect large without unacceptable Type I errors. Compared live-trapping, results time, expensive easier deploy field, caused no mortality animals, eliminated exposure technicians diseases transmitted rodents.