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Ballestar, R., Bordonado, S., Bonilla, J., Brugada, L., Gazcano, C., & Avellan, C., et al. , Abundance patterns at local scale and conservation of the spur-thighed tortoise (testudo graeca graeca) in almeria province (andalusia, spain). Paper presented at XIII Congreso Espanol. 
Added by: Admin (14 Aug 2008 20:32:44 UTC)
Resource type: Proceedings Article
BibTeX citation key: Ballestar2006
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Categories: General
Keywords: Habitat = habitat, Schildkröten = turtles + tortoises, Südwesteuropa = South-Western Europe, Testudinidae
Creators: , Avellan, Ballestar, Bonilla, Bordonado, Brugada, Gazcano, Giménez Casalduero, Lloret, Montesinos, Planelles, Richarte
Publisher: Sociedad de Ciencias Aranzadi Zientzi Elkartea
Collection: XIII Congreso Espanol
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Abstract     
Testudinidae Individual abundance in a local population is, in general, the most interesting variable in Ecology studies (McCallum, 2000), from which different approximations to the population dynamics of the species can be made. In this study, an analysis was made of 55 spur-tighed tortoise populations spread all along their distribution area in Almeria province, with the objective of determining the abundance of the tortoise and its conservation status, as well as to relate that abundance to different environmental variables using Generalized Linear Models (GLM). For this purpose, different census itineraries consisting in linear transects along 2005 and 2006 spring season were made. To figure out density in each area, the Distance program (Laake et al., 1993) was used. The abundance estimates obtained with this system varied between 0.85 individuals per hectare and around 20 individuals/ha. It was detected that the variables which most influence spur-tighed tortoise density are minimum annual temperature, spring rain shortage, altitude above sea level and the presence of open scrubland and herbaceous and wooded non-irrigated crops.
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