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Published in: Biodiversity and Conservation 7/2019

13-04-2019 | Original Paper

Long-term monitoring of Menorcan butterfly populations reveals widespread insular biogeographical patterns and negative trends

Authors: Pau Colom, David Carreras, Constantí Stefanescu

Published in: Biodiversity and Conservation | Issue 7/2019

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Abstract

A number of studies analysing the structure of butterfly communities on Mediterranean islands have confirmed the well-established pattern of a current decrease in species richness in island communities. However, these studies generally lack quantitative data on butterfly population densities across habitats and over time. This precludes testing the hypotheses of ecological release, niche expansion and density compensation in island populations and their links to the presence of fewer competitors and/or predators. Here we use long-term monitoring data on butterfly populations from five sites on Menorca (Balearic Islands) and 20 sites from continental Catalonia (NE Spain) to test several hypotheses regarding island biogeography. We first confirm that island butterfly assemblages are not only impoverished versions of their continental counterparts but also have an over-representation of habitat generalists and highly mobile species. On the other hand, we did not find a consistent phenomenon of niche expansion and density compensation was only found for Celastrina argioulus and Gonepteryx cleopatra. Given the absence of habitat specialists on islands and the severe population declines taking place amongst specialist species on mainland Catalonia in the past two decades, we expected to detect more positive trends in island butterfly communities. Instead, we noted widespread declines, comparable to those previously recorded on the continent. Both the extension of the summer drought on Menorca and general habitat degradation due to the abandonment of cattle and sheep grazing may be responsible for these general declines.
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Metadata
Title
Long-term monitoring of Menorcan butterfly populations reveals widespread insular biogeographical patterns and negative trends
Authors
Pau Colom
David Carreras
Constantí Stefanescu
Publication date
13-04-2019
Publisher
Springer Netherlands
Published in
Biodiversity and Conservation / Issue 7/2019
Print ISSN: 0960-3115
Electronic ISSN: 1572-9710
DOI
https://doi.org/10.1007/s10531-019-01764-1