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Connectivity Predicts Presence but Not Population Density in the Habitat-Specific Mountain Lizard Iberolacerta martinezricai

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  • Diego Lizana-Ciudad

    (Section of Zoology, Department of Animal Biology, Parasitology, Ecology, Edaphology and Agronomic Chemistry, Campus Miguel de Unamuno, University of Salamanca, 37071 Salamanca, Spain)

  • Víctor J. Colino-Rabanal

    (Section of Zoology, Department of Animal Biology, Parasitology, Ecology, Edaphology and Agronomic Chemistry, Campus Miguel de Unamuno, University of Salamanca, 37071 Salamanca, Spain)

  • Óscar J. Arribas

    (Ntra. Sra. de Calatañazor 17 b, 42004 Soria, Spain)

  • Miguel Lizana

    (Section of Zoology, Department of Animal Biology, Parasitology, Ecology, Edaphology and Agronomic Chemistry, Campus Miguel de Unamuno, University of Salamanca, 37071 Salamanca, Spain)

Abstract

The Batuecan lizard Iberolacerta martinezricai is a critically endangered species due to its significantly reduced distribution, which is restricted to the scree slopes (SS) of a few mountain peaks within the Batuecas-Sierra de Francia Natural Park (western Spain). Given its high specialisation in this type of discontinuous habitat, the long-term conservation of the species requires maintaining the connectivity between populations. This study analyses the contribution of connectivity, as well as other patch-related factors, in the distribution and density patterns of the species. With this aim, 67 SS were sampled by line transects from May to October 2018. Each SS was characterised using variables indicative of the microhabitat conditions for the lizard. Inter-SS connectivity was quantified using graph theory for seven distances. Generalised linear models (GLMs) were performed for both presence and density. Model results showed that while connectivity was a relevant factor in the presence of lizards, density only involved patch-related variables. Discrepancies probably occurred because the factors influencing presence operate on a wider scale than those of abundance. In view of the results, the best-connected SS, but also those where the lizard is most abundant and from which more dispersed individuals are likely to depart, seem to be the essential patches in any conservation strategy. The results may also be relevant to other species with habitat-specific requirements.

Suggested Citation

  • Diego Lizana-Ciudad & Víctor J. Colino-Rabanal & Óscar J. Arribas & Miguel Lizana, 2021. "Connectivity Predicts Presence but Not Population Density in the Habitat-Specific Mountain Lizard Iberolacerta martinezricai," Sustainability, MDPI, vol. 13(5), pages 1-14, March.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:5:p:2647-:d:508708
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