Effect of landscape structure on the spatial distribution of Mediterranean dung beetle diversity

Authors

  • Catherine Numa,

    Corresponding author
    1. Instituto Universitario de Investigación: Centro Iberoamericano de la Biodiversidad (CIBIO) – Universidad de Alicante, Alicante, Spain,
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  • José R. Verdú,

    1. Instituto Universitario de Investigación: Centro Iberoamericano de la Biodiversidad (CIBIO) – Universidad de Alicante, Alicante, Spain,
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  • A. Sánchez,

    1. Departamento de Análisis Geográfico Regional y Geografía Física, Universidad de Alicante, Alicante, Spain
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  • Eduardo Galante

    1. Instituto Universitario de Investigación: Centro Iberoamericano de la Biodiversidad (CIBIO) – Universidad de Alicante, Alicante, Spain,
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*Correspondence: Catherine Numa, Instituto Universitario de Investigación: Centro Iberoamericano de la Biodiversidad (CIBIO) – Universidad de Alicante. San Vicente del Raspeig, 03080 Alicante, Spain. E-mail: numa@ua.es

ABSTRACT

Aim  Landscape structure influences the distribution of animals, altering their movements and their ability to reach habitat patches. We analysed the spatial patterns of dung beetle species diversity in three differently structured natural landscapes in a Mediterranean protected area in the centre of the Iberian Peninsula.

Location  Cabañeros National Park, Central Spain.

Methods  Diversity components within (α) and among (β) the three main vegetation types in the reserve were compared by using a hierarchical nested design. These were forests, scrublands and grasslands embedded in three different landscapes, where each was the most dominant and structurally connected habitat.

Results  Species richness of grassland habitat did not vary across landscapes, but forest habitat showed lower species richness in the grassland-dominated landscape. Scrubland was the least species-rich habitat, but here again there was no significant variation across landscapes. However, in all cases, there was a significant influence of habitat context (configuration of habitat patches within landscape matrix) on similarity of species composition. These tended to be more similar to the dominant landscape matrix where they were embedded, rather than to the same habitat type in other landscapes. Additive partitioning of diversity showed higher than expected values of β in all landscapes, which indicated a structured response. Highest values of β in the grassland-dominated landscape suggest that this was the least connected landscape for dung beetles.

Main conclusions  Our results suggest that in homogeneous conditions of climate and trophic resources, landscape structure may well be more important than habitat type as a determinant of dung beetle distribution in the Mediterranean.

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