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Effects of natural forest fragmentation on a Hawaiian spider community

January 1, 2004

The kipuka system, a network of forest fragments surrounded by lava flows on the island of Hawaii, offers an opportunity to study the natural, long-term fragmentation of a native ecosystem. We examined the impacts of habitat edges upon the community structure of nocturnally active native spiders, primarily in the genus Tetragnatha. We measured plant and spider species distributions across the edges of four small fragments and one large continuously forested area that were surrounded by a lava flow in 1855. Results indicated that an ???20 m edge ecotone surrounds core forest habitat. Spider community structure changed across the edge, with a decrease in total species richness and diversity at the forest/lava boundary, and a change in the dominant taxon from native Tetragnatha (Tetragnathidae) to native Cyclosa (Araneidae). Severe habitat restrictions were found for some spider species. In addition, nearly all of the spiders captured were endemic species, and the few introduced species were limited to the younger and more open lava flows. Our results suggest that species responses to edges can vary, and that core habitat specialists may decline in fragmented conditions.

Publication Year 2004
Title Effects of natural forest fragmentation on a Hawaiian spider community
DOI 10.1603/0046-225X-33.5.1296
Authors Amy G. Vandergast, Rosemary G. Gillespie
Publication Type Article
Publication Subtype Journal Article
Series Title Environmental Entomology
Index ID 70026591
Record Source USGS Publications Warehouse
USGS Organization Western Ecological Research Center