Literaturdatenbank
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Santos, X., Badiane, A., & Matos, C. , Land-use and forest-fire histories affect the distribution of testudo hermanni hermanni at the serra de l’albera (ne iberia). Unpublished paper presented at Atelier international sur la gestion et la restauration des populations et habitats de la Tortue d’Hermann / International workshop on the management and restoration of Hermann’s tortoise populations and habitats.
Added by: Admin (06 Jan 2014 18:25:18 UTC) |
| Resource type: Conference Paper BibTeX citation key: Santos2013 View all bibliographic details  |
Categories: General Keywords: Habitat - habitat, Schildkröten - turtles + tortoises, Südwesteuropa - South-Western Europa, Testudinidae, Testudo hermanni Creators: Badiane, Matos, Santos Collection: Atelier international sur la gestion et la restauration des populations et habitats de la Tortue d’Hermann / International workshop on the management and restoration of Hermann’s tortoise populations and habitats |
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| Abstract |
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Testudo hermanni Testudinidae The Serra de l’Albera is the most western population of the Testudo hermanni hermanni subspecies. This population is characterized by a limited distribution range and a low population density. A number of threats have been described for this population including habitat loss and fragmentation, indiscriminate collection of individuals, habitat alteration, eggs predation by the wild boar and small carnivores, and forest fires. Based on a fieldwork study in 25 sites (with 5 replicates per site) in 2012 and 2013, we have explored factors which could explain presence/absence and relative abundances of this species. As predictors, we have used the fire-history (i.e. number of fires and time since the last fire), land-use heterogeneity (i.e. evenness calculated from the extension of land uses in a 1000-m buffer around transects), complexity of the habitat structure and plant diversity (i.e. evenness calculated from a 100-m transect measured within the sampled sites), and the geographical location of sampled transects. Our results suggest that high habitat complexity is a main element that explains abundances. However, we also found a geographic effect: in transects apparently adequate, tortoises were absent, whereas they were present in repeated-burnt sites clustered to unburnt sites with moderate tortoises abundance. These unexpected results suggest that historical factors as well as habitat complexity are both critical factors driving presence and abundance of Testudo hermanni hermanni at the Albera range.
Added by: Admin |