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Local Extinction of Dragonfly and Damselfly Populations in Low- and High-Quality Habitat Patches

Authors

  • JUKKA SUHONEN,

    1. Department of Biological and Environmental Science, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
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    • Current address: Section of Ecology, Department of Biology, University of Turku, FI-20014 Turku, Finland, emailjuksuh@utu.fi

  • MILLA HILLI-LUKKARINEN,

    1. Department of Biological and Environmental Science, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
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    • Current address: Environmental Protection Department, City of Tampere, P.O. Box 487, FI-33101 Tampere, Finland

  • ESA KORKEAMÄKI,

    1. Department of Biological and Environmental Science, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
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    • Current address: Finnish Forest and Park Service, Sapokankatu 2, FI-48100 Kotka, Finland

  • MARKKU KUITUNEN,

    1. Department of Biological and Environmental Science, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
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  • JOHANNA KULLAS,

    1. Department of Biological and Environmental Science, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
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    • Current address: West Finland Regional Environment Centre, Research and Nature Conservation, P.O. Box 262, FI-65101 Vaasa, Finland

  • JOUNI PENTTINEN,

    1. Department of Biological and Environmental Science, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
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  • JUKKA SALMELA

    1. Department of Biological and Environmental Science, P.O. Box 35, FI-40014, University of Jyväskylä, Finland
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Abstract

Abstract: Understanding the risk of extinction of a single population is an important problem in both theoretical and applied ecology. Local extinction risk depends on several factors, including population size, demographic or environmental stochasticity, natural catastrophe, or the loss of genetic diversity. The probability of local extinction may also be higher in low-quality sink habitats than in high-quality source habitats. We tested this hypothesis by comparing local extinction rates of 15 species of Odonata (dragonflies and damselflies) between 1930–1975 and 1995–2003 in central Finland. Local extinction rates were higher in low-quality than in high-quality habitats. Nevertheless, for the three most common species there were no differences in extinction rates between low- and high-quality habitats. Our results suggest that a good understanding of habitat quality is crucial for the conservation of species in heterogeneous landscapes.

Abstract

Resumen: La comprensión del riesgo de extinción de una población es un problema importante tanto en ecología teórica como aplicada. El riesgo de extinción local depende de varios factores, incluyendo el tamaño poblacional, la estocasticidad ambiental o demográfica, las catástrofes naturales o la pérdida de diversidad genética. La probabilidad de extinción local también puede ser mayor en hábitats vertedero de baja calidad que en hábitats fuente de alta calidad. Probamos esta hipótesis mediante la comparación de tasas de extinción local de 15 especies de Odonata (libélulas) entre 1930–1975 y 1995–2003 en Finlandia central. Las tasas de extinción local fueron mayores en hábitats de baja calidad que en hábitats de alta calidad. Sin embargo, no hubo diferencias entre las tasas de extinción de las tres especies más comunes en hábitats de alta y baja calidad. Nuestros resultados sugieren que un buen entendimiento de la calidad del hábitat es crucial para la conservación de especies en paisajes heterogéneos.

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