Contrasts in short- and long-term responses of Mediterranean reptile species to fire and habitat structure
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Changes in habitat structure constitute a major factor explaining responses of reptiles to fire. However, few studies have examined habitat factors that covary with fire-history variables to explain reptile responses. We hypothesise that more complex habitats should support richer reptile communities, and that species-specific relative abundance should be related to particular habitat features. From spring 2012–2014, twenty-five transects were surveyed in the Albera Region (north-east Iberia). The vegetation structure was measured and the extent of habitat types in a 1000-m buffer around each transect calculated. Reptile-community metrics (species richness and reptile abundance) were related to fire history, vegetation structure, and habitat types, using generalized additive models. These metrics correlated with habitat-structure variables but not with fire history. The number of species increased with more complex habitats but decreased with pine-plantation abundance in the 1000-m buffer. We found contrasting responses among reptiles in terms of time since fire and those responses differed according to vegetation variables and habitat types. An unplanned fire in August 2012 provided the opportunity to compare reptile abundance values between pre-fire and the short term (1–2 years) after the fire. Most species exhibited a negative short-term response to the 2012 fire except Tarentola mauritanica, a gecko that inhabits large rocks, as opposed to other ground-dwelling species. In the reptiles studied, contrasting responses to time since fire are consistent with the habitat–accommodation model of succession. These differences are linked to specific microhabitat preferences and suggest that functional traits can be used to predict species-specific responses to fire.
KeywordsDisturbance Repeated-fire regime Reptiles Habitat–accommodation model Microhabitat preferences
We are especially grateful to Joan Budó, Xavier Caparelles, and Albert Vilardell from the Centre de Reproducció de Tortugues for their valuable logistic support and transmission of historic information of the herpetofauna, vegetation, and economic development of the Albera region; Leonardo Bejarano (Generalitat de Catalunya) for supplying the GIS shapefiles from the habitat types for the study area and Núria Nadal (Forestal Catalana), who supplied information on the fire history within the project Pla de Prevenció d’Incendis Forestals del Massís de l’Albera granted by the Departament d’Agricultura, Ramaderia, Pesca, Alimentació i Medi Natural (Generalitat de Catalunya). Two anonymous reviewers gave helpful comments which improved the text. Philip Wheeler and Melanie Coull are thanked for their improvements to the English version of this manuscript. David Nesbitt corrected the English style. Xavier Santos was funded by a post-doctoral grant (SFRH/BPD/73176/2010) from Fundação para a Ciência e a Tecnologia (Portugal) and Cátia Matos was funded by a doctoral grant from Natural England (UK).
Author contribution statement
X. S. conceived of and designed the fieldwork experiment; X. S. and A. B. conducted the fieldwork; X. S. and C. M. analysed data; X. S. wrote the manuscript, and the other authors provided editorial advice.
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