Skip to Main content Skip to Navigation
Journal articles

Non-native spiders change assemblages of Hawaiian forest fragment kipuka over space and time

Abstract : We assessed how assemblages of spiders were structured in small Hawaiian tropical forest fragments (Hawaiian, kipuka) within a matrix of previous lava flows, over both space (sampling kipuka of different sizes) and time (comparison with a similar study from 1998). Standardized hand-collection by night was carried out in May 2016. In total, 702 spiders were collected, representing 6 families and 25 (morpho-)species. We found that the number of individuals, but not species richness, was highly correlated with the area of sampled forest fragments, suggesting that kipuka act as separate habitat islands for these predatory arthropods. Species richness was significantly lower in the lava matrix outside the kipuka compared to the kipuka habitats, although there was no statistical difference in species composition between the two habitats, largely because of similarity of non-native species in both habitats. Over the last 20 years, the abundance of non-native spider species substantially increased in both kipuka and lava habitats, in marked contrast to the vegetation that has remained more intact. With endemicity of terrestrial arthropods reaching over 95% in native forests, non-native predatory species present a critical challenge to the endemic fauna.
Document type :
Journal articles
Complete list of metadatas

Cited literature [23 references]  Display  Hide  Download

https://hal-univ-rennes1.archives-ouvertes.fr/hal-02562173
Contributor : Laurent Jonchère <>
Submitted on : Wednesday, July 15, 2020 - 3:56:36 PM
Last modification on : Friday, August 28, 2020 - 4:38:34 PM

File

NB_article_48498_en_1.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Julien Petillon, Kaina Privet, George K. Roderick, Rosemary G. Gillespie, Don K. Price. Non-native spiders change assemblages of Hawaiian forest fragment kipuka over space and time. NeoBiota, Pensoft Publishers, 2020, 55 (55), pp.1-9. ⟨10.3897/neobiota.55.48498⟩. ⟨hal-02562173⟩

Share

Metrics

Record views

54

Files downloads

65