A comparative analysis of terrestrial arthropod assemblages from a relict forest unveils historical extinctions and colonization differences between two oceanic islands

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Boieiro , M , Matthews , T J , Rego , C , Crespo , L , Aguiar , C A S , Cardoso , P , Rigal , F , Silva , I , Pereira , F , Borges , P A V & Serrano , A R M 2018 , ' A comparative analysis of terrestrial arthropod assemblages from a relict forest unveils historical extinctions and colonization differences between two oceanic islands ' , PLoS One , vol. 13 , no. 4 , 0195492 . https://doi.org/10.1371/journal.pone.0195492

Title: A comparative analysis of terrestrial arthropod assemblages from a relict forest unveils historical extinctions and colonization differences between two oceanic islands
Author: Boieiro, Mario; Matthews, Thomas J.; Rego, Carla; Crespo, Luis; Aguiar, Carlos A. S.; Cardoso, Pedro; Rigal, Francois; Silva, Isamberto; Pereira, Fernando; Borges, Paulo A. V.; Serrano, Artur R. M.
Contributor: University of Helsinki, Finnish Museum of Natural History
Date: 2018-04-25
Language: eng
Number of pages: 22
Belongs to series: PLoS One
ISSN: 1932-6203
URI: http://hdl.handle.net/10138/235201
Abstract: During the last few centuries oceanic island biodiversity has been drastically modified by human-mediated activities. These changes have led to the increased homogenization of island biota and to a high number of extinctions lending support to the recognition of oceanic islands as major threatspots worldwide. Here, we investigate the impact of habitat changes on the spider and ground beetle assemblages of the native forests of Madeira (Madeira archipelago) and Terceira (Azores archipelago) and evaluate its effects on the relative contribution of rare endemics and introduced species to island biodiversity patterns. We found that the native laurel forest of Madeira supported higher species richness of spiders and ground beetles compared with Terceira, including a much larger proportion of indigenous species, particularly endemics. In Terceira, introduced species are well-represented in both terrestrial arthropod taxa and seem to thrive in native forests as shown by the analysis of species abundance distributions (SAD) and occupancy frequency distributions (OFD). Low abundance range-restricted species in Terceira are mostly introduced species dispersing from neighbouring man-made habitats while in Madeira a large number of true rare endemic species can still be found in the native laurel forest. Further, our comparative analysis shows striking differences in species richness and composition that are due to the geographical and geological particularities of the two islands, but also seem to reflect the differences in the severity of human-mediated impacts between them. The high proportion of introduced species, the virtual absence of rare native species and the finding that the SADs and OFDs of introduced species match the pattern of native species in Terceira suggest the role of man as an important driver of species diversity in oceanic islands and add evidence for an extensive and severe human-induced species loss in the native forests of Terceira.
Subject: SPECIES-ABUNDANCE DISTRIBUTIONS
NORTH-ATLANTIC OCEAN
BIODIVERSITY HOTSPOTS
BEETLES COLEOPTERA
MASS EXTINCTION
GAMBIN MODEL
DIVERSITY
CONSERVATION
AZORES
ARCHIPELAGO
1181 Ecology, evolutionary biology
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