Literaturdatenbank
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Popgeorgiev, G., & Tzankov, N. D. , The effects of fires of different ages on the demographic structure of hermann’s (testudo hermanni boettgeri mojsisovics, 1889) and spur-thighed (testudo graeca ibera pallas, 1814) tortoise populations in eastern rhodopes mountains, bulgaria. Unpublished paper presented at Atelier international sur la gestion et la restauration des populations et habitats de la Tortue d’Hermann / International workshop on the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 18:25:11 UTC) |
| Resource type: Conference Paper BibTeX citation key: Popgeorgiev2013 View all bibliographic details  |
Categories: General Keywords: Habitat - habitat, Schildkröten - turtles + tortoises, Südosteuropa - South-Eastern Europe, Testudinidae, Testudo graeca, Testudo hermanni Creators: Popgeorgiev, Tzankov 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 graeca Testudinidae Annual fires affect hundreds of regions in Bulgaria. The numerous fires during the last decade in the area of Eastern Rhodopes (Southeastern Bulgaria) led to large losses of habitat for the Hermann’s (Testudo hermanni boettgeri) and Spur-thighed (Testudo graeca ibera) tortoises. This region is among the places that are densely populated by tortoises. Six pairs of polygons affected by fires respectively in 1996, 2000 and 2003 were studied from 2005 to 2007. The data from this study demonstrate that fires haves caused large negative impacts on the populations of Testudo hermanni and slightly lower impacts on Testudo graeca. The average density of the Testudo hermanni populations in the burned areas is 7.2 times lower than that of the control areas. The differences in the population densities of Testudo graeca are smaller, but are still well pronounced – the density for the burned area is 4.2 times lower than that of the control area. The recorded mortality due to fire is considerably higher for Testudo hermanni. For Testudo graeca, observed mortality is three times lower. For both species, females are the more affected classes in respect to males and juveniles. Fires are among the most significant threats for tortoises and a set of large scale measures have to be implemented in a national and in a local level in order to reduce the negative impact of such factor.
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