|Keywords||Anolis bimaculatus, A. schwartzi, habitat and microhabitat use, structural niche breadth and Overlap|
|Abstract||Anolis schwartzi and A. bimaculatus are St. Christopher Bank endemics. In June 2004, we examined populations of both species at six sites on the The Quill, a dormant volcano on St. Eustatius, in order to: (1) estimate population densities, (2) study microhabitat utilization, and (3) evaluate the structural niche breadths of both species and niche overlaps between species. Estimated population densities were 729-6812/ha for A. schwartzi on the leeward (west-facing) slope and 3201/ha and 4368/ha on the windward slope. Anolis bimaculatus was very rare in our leeward study plots, but we calculated densities of 1042/ha and 1667/ha for extensively insolated plots on the windward slope. Anolis schwartzi effectively utilized all sampled habitats, but preferred those with shade and abundant rocks. On the leeward side, A. schwartzi was most abundant on rocks and litter. On the windward side, both species preferred trunks of trees in the absence of large rocks; however, A. schwartzi appeared to prefer rocks, when available. Perch heights for A. schwartzi and A. bimaculatus were greater at windward than at leeward sites, and A. bimaculatus perched higher than A. schwartzi. Both species used smaller trunks, but A. bimaculatus used larger trees than A. schwartzi, with adult males of both species showing a preference for tree trunks of large diameter. Most individuals in all size classes of both species were in full shade. Niche breadths were generally indicative of habitat generalists and niche overlaps were high for all size classes of both species across all study sites.|
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|Name||Affiliation||Home page||Total pubs|
|Diaz PM||Department of Biology, University of Puerto Rico, Rio Piedras, PR 00931, USA||1|
|Heinz H||Department of Biology, North Carolina State University, Raleigh, NC 27695 USA||1|
|Parmerlee JrJS||Department of Biology, Haskell Indian Nations University, Lawrence, Kansas 66046 and Department of Biology, Johnson County Community College, Overland Park, Kansas 66210, USA.||3|
|Powell R||Department of Biology, Avila University, Kansas City, Missouri firstname.lastname@example.org||14|
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