Publication Date:
2024-01-12
Description:
Spiders were sampled from one-hectare tropical rainforest plots in three
\nparks in northern Vietnam. Inventories were based on ecologically structured
\nsampling employing five methods. A series of non-parametric estimators were
\nused to extrapolate the true species richness from the samples for each locality
\nand indicate the magnitude of sampling effort necessary to inventory a variety of
\nprotected Southeast Asian tropical forests. We investigated the Beta diversity
\nbetween sites and explored the distinctness of the communities sampled by the
\nvarious collecting methods. Our approach takes the incompleteness of our inventories into account and estimates the number of unobserved shared species. Rank
\nsample abundance was positively correlated with number of sites observed.
\nHowever, when sample abundance was scaled by incidence (as an index of detection probability), this relationship disappeared. This suggests no difference in
\nthe probability that abundant and rare species will be present in different sites
\neven if the detection probability of rare species is low. The three sites differed in
\ntheir observed and estimated point diversity with the lowest diversity site, Cuc
\nPhuong, also having the least vertically-stratified spider community. The three
\nsites, separated by 150\xe2\x80\x93300 km and differing in vegetation community, elevation, geology, and other attributes, experience an estimated 65\xe2\x80\x9385% turnover in
\nspecies composition over differences of this magnitude. We discuss the rationale
\nfor using the non-parametric estimator approach and caution that estimates can
\nbe unreliable when samples contain an insufficient portion of the community.
Keywords:
Beta diversity
;
Chao-Jaccard index
;
community ecology
;
detection probability
;
ecological stratification
;
species accumulation curves
;
species richness estimators
;
structured sampling
Repository Name:
National Museum of Natural History, Netherlands
Type:
info:eu-repo/semantics/article
Format:
application/pdf
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