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Astruc, G., Couturier, T., Besnard, A., Bertolero, A., Bosc, V., & Cheylan, M. , Facteurs déterminants l’abondance et l’occurrence de la tortue d’hermann en france et en espagne. Unpublished paper presented at Atelier international sur la gestion et la restauration des populations et habitats de la Tortue d’Hermann / International workshop on the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 18:23:59 UTC)
Resource type: Conference Paper
BibTeX citation key: Astruc2013
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Categories: General
Keywords: Habitat - habitat, Schildkröten - turtles + tortoises, Südwesteuropa - South-Western Europa, Testudinidae, Testudo hermanni
Creators: Astruc, Bertolero, Besnard, Bosc, Cheylan, Couturier
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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Views index: 18%
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Abstract     
Testudo hermanni Testudinidae Major landscape transformations have occurred in the northern Mediterranean over the last decades, including urbanization, agricultural intensification and land abandonment, which, in turn, increase the risk of the propagation of fire. We used repeated-count surveys conducted at 369 sites in France and Spain to jointly model the effects of environmental covariates on the abundance, occupancy and detection of Hermann’s tortoise, a long-lived and endangered species, using a novel zero-inflated approach. We also employed a large dataset of presence-only data collected in Provence to model environmental influences on occurrence probability using maximum entropy models. In Provence, we found high occurrence probability in habitats of scrub and herbaceous vegetation (65%), forests (56%) and agricultural areas (44%), and low probability (16%) in artificial areas. In both France and Spain, sites that experienced wildfires over the last 50 years hosted 31% fewer individuals than unburned sites. In Provence, higher wildfire frequency decreased this species’ occurrence probability, from 62% when no fire had occurred over the last 50 years, to 8% in areas that had burned at least 3 times. We also showed a long recovery time for abundance (more than 20 years) after wildfires. These results suggest that although Hermann’s tortoise is tolerant of a variety of environmental conditions, it is particularly affected by the conversion of natural to artificial areas. The species is also highly sensitive to wildfires, so the higher wildfire frequency predicted by climate change scenarios in the Mediterranean is likely to increase the risk of extinction for some populations.
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