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

  • Pau ColomEmail author
  • David Carreras
  • Constantí Stefanescu
Original Paper

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.

Keywords

Island biogeography Balearic Islands Butterfly assemblages Habitat specialization Density compensation Population trends 

Notes

Acknowledgements

We would like to thank all the CBMS volunteers who have carried out the counts during all these years. This research would not have been possible without them. We would also specifically like to thank the Socio-environmental Observatory of Menorca, the Natural Park of S’Albufera des Grau and Menorca Agency Biosphere Reserve for their support for the Menorcan recording stations. Yolanda Melero, Ferran Páramo and Andreu Ubach assisted in data analysis and organisation.

Supplementary material

10531_2019_1764_MOESM1_ESM.docx (25 kb)
Supplementary material 1 (DOCX 25 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Institut Mediterrani d’Estudis Avançats (CSIC-UIB)Global Change Research GroupEsporlesSpain
  2. 2.Observatori Socioambiental de MenorcaInstitut Menorquí d’EstudisMaóSpain
  3. 3.Museu de Ciències Naturals de GranollersGranollersSpain
  4. 4.Centre de Recerca Ecològica i Aplicacions Forestals (CREAF-CSIC-UAB)Universitat Autònoma de BarcelonaCerdanyola De VallèsSpain

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