Abstract
The understanding and prediction of the responses of animal populations to habitat fragmentation is a central issue in applied ecology. The identification of habitat variables associated to patch occupancy is particularly important when habitat quality is affected by human activities. Here, we analyze the influence of patch and landscape characteristics on patch occupancy by the subterranean herbivorous rodent Ctenomys porteousi. Patch occupancy was monitored in a network of 63 habitat patches identified by satellite imagery analysis which extends along almost the whole distributional range for C. porteousi. Suitable habitat for the occurrence of C. porteousi is highly fragmented and represents <10% of the total area in its distributional range. The distribution of C. porteousi in the patch network is affected not only by characteristics of the habitat patches, but also by those of the surrounding landscape matrix. Significant differences between occupied and empty patches were found in several environmental variables. Overall, occupied patches were larger, less vegetated, more connected, and had larger neighbor patches than empty patches. A stepwise procedure on a generalized linear model selected four habitat variables that explain patch occupancy in C. porteousi; it included the effects of habitat quality in the matrix surrounding the patch, average vegetation cover in the patch, minimum vegetation cover in the matrix surrounding the patch, and the area of the nearest neighbor patch. These results indicate that patch occupancy in C. porteousi is strongly influenced by the availability and quality of habitat both in the patch and in the surrounding landscape matrix.
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Acknowledgments
This research was supported by grants from FONCYT (PICT 05-38361) and CONICET (PIP 5844) Argentina. The authors would like to express our gratitude to Matías S. Mora for assistance during fieldwork. FJM is a fellow and MJK is adjunct researcher from CONICET, Argentina. The author thank G. P. Fernández-Stolz and anonymous reviewer for their comments which greatly improved the quality of this manuscript.
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Mapelli, F.J., Kittlein, M.J. Influence of patch and landscape characteristics on the distribution of the subterranean rodent Ctenomys porteousi . Landscape Ecol 24, 723–733 (2009). https://doi.org/10.1007/s10980-009-9352-x
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DOI: https://doi.org/10.1007/s10980-009-9352-x