Visual Search for Tropical Web Spiders: The Influence of Plot Length, Sampling Effort, and Phase of the Day on Species Richness

摘要: Empirical studies using visual search methods to investigate spider communities were conducted with different sampling protocols, including a variety of plot sizes, efforts, and diurnal periods for sampling. We sampled 11 plots ranging in size from 5 by 10 m 60 m. In each plot, we computed the total number species detected every min during 1 hr daytime nighttime (0630 hours 1100 hours, both a.m. p.m.). measured influence time effort on measurement richness comparing curves produced sample-based rarefaction estimation (first-order jackknife). used general linear model repeated measures assess whether phase day which occurred differences lengths influenced observed estimated. To measure composition between phases day, multiresponse permutation procedure graphical representation based nonmetric multidimensional scaling. After 50 sampling, noted decreased rate accumulation tendency estimated reach an asymptote. did not detect effect sampled. However, found day. Based these results, propose guidelines tropical web spiders.