EFFECTS OF SAMPLING DESIGN ON AGE RATIOS OF MIGRANTS CAPTURED AT STOPOVER SITES

摘要: Abstract Age classes of migrant songbirds often differ in migration timing. This difference creates the potential for age-ratios recorded at stopover sites to vary with amount and distribution sampling effort used. To test these biases, we sub-sampled capture data from Middle Rio Grande Valley New Mexico. We created sets that reflected age ratios migrants would have been captured stratified concentrated designs four levels mist-netting effort. Analysis indicate Neotropical varied significantly design, but not More after-hatch-year were than designs. Age-ratio temperate did either or design. Sampling design is an important consideration interpretation among sites, standardization coul...