Abstract
Context
Disentangling the relative effects of forest loss versus fragmentation on species distribution and abundance is crucial for adopting efficient biodiversity conservation actions, which could change with the nature of the landscape matrix.
Objectives
We tested the moderating effect of landscape matrix on insectivorous bats response to forest loss and fragmentation.
Methods
We conducted acoustic surveys at forest patches surrounded by either an agricultural-dominated matrix or a pine-dominated matrix. We related bat activity to forest amount and the number of forest patches at multiple spatial scales, and compared their effects between landscape matrices.
Results
Bat activity was associated with both predictors, however their effects varied with the matrix type. In agricultural landscapes, as the amount of forest increased, the activity of Histiotus montanus, Lasiurus cinereus and Tadarida brasiliensis increased, while activity of Myotis chiloensis decreased. Similarly, as fragmentation increased, the activity of Lasiurus varius and M. chiloensis increased, while activity of H. montanus decreased. In production-forest landscapes, only H. montanus decreased its activity with increasing forest amount. In contrast, activity of L. cinereus, M. chiloensis and T. brasiliensis increased with increasing fragmentation. Forest amount was a stronger predictor for agricultural landscapes than for production-forest landscapes, suggesting that low contrast matrices can mitigate the effects of forest loss.
Conclusions
Fragmented landscapes with native forest patches surrounded by a low contrast matrix may support a higher activity of insectivorous bats. Management efforts in fragmented landscapes should aim to decrease the patch-matrix contrast, which will mitigate the effects of forest loss on bats.
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Acknowledgments
We are grateful to L.F. Aguirre (PCMB) for the loan of bat detectors. Special thanks to R. Zúñiga and Y. Cerda for their invaluable help with the fieldwork and D. Rojas for his help with statistical analysis. We are also grateful to the Coordinating Editor and two anonymous reviewers for valuable comments that improved a previous version of the manuscript. This research has been partially supported by FONDECYT 1095046 and Programa Domeyko-Biodiversidad (IT3), Universidad de Chile. A. Rodríguez-San Pedro was supported by a doctoral fellowship from Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Chile.
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Rodríguez-San Pedro, A., Simonetti, J.A. The relative influence of forest loss and fragmentation on insectivorous bats: does the type of matrix matter?. Landscape Ecol 30, 1561–1572 (2015). https://doi.org/10.1007/s10980-015-0213-5
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DOI: https://doi.org/10.1007/s10980-015-0213-5