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Evaluating connectivity between Natura 2000 sites within the montado agroforestry system: a case study using landscape genetics of the wood mouse (Apodemus sylvaticus)

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Abstract

Context

The Natura 2000 network is the centerpiece of European nature conservation policy but its effectiveness is challenged by ongoing landscape change.

Objective

Our objective was to assess landscape connectivity between Natura 2000 sites in the biodiversity-rich western Mediterranean region.

Methods

We used the wood mouse as a focal species with short-range dispersal and obtained genetic data for 393 individuals uniformly distributed between two Natura 2000 sites in SW Portugal. We created a map of connectivity between the two sites that was based on a stack of analyses including reciprocal causal modeling and least-cost path modeling coupled with resistant kernel analysis.

Results

Wood mice in the study area were genetically diverse and connected by gene flow over a large area. We did not find evidence of major population subdivision in the study area. Gene flow was limited by geographic distance, with significant genetic similarity between individuals within 3 km of each other. Vegetation cover and land use explained more of the variation in genetic distance than geographic distance alone. In particular, agroforestry areas and transitional woodland were associated with higher costs to movement than forest or arable land uses. This result may have been influenced by the difficulty in classifying land use in the open montado.

Conclusions

The Natura 2000 sites we studied are well connected by multiple corridors for dispersal. Our analysis also highlighted the importance of the Serra de Grândola, part of the European Long Term Ecological Research Network but not yet included in Natura 2000.

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Acknowledgments

We thank the anonymous reviewers and Denise O’ Meara for their helpful comments on earlier drafts of this manuscript. Fabiana Marques and Ana Catarina Silva provided fieldwork support. This study was funded by the Portuguese Foundation for Science and Technology (FCT) projects PTDC/BIA-BEC/101511/2008 and LTER/BIA-BEC/0048/2009, and individual contracts C2007-UL-342-CBA1 (CF) and SFRH/BD/38053/2007 (FA). Fieldwork was carried out under license from the Portuguese Institute for Nature Conservation and Biodiversity (ICNB; Instituto da Conservação da Natureza e Biodiversidade).

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  1. Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016, Lisbon, Portugal

    Jacinta Mullins, Fernando Ascensão, Luciana Simões, Leonardo Andrade, Margarida Santos-Reis & Carlos Fernandes

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  1. Jacinta Mullins
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  2. Fernando Ascensão
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  3. Luciana Simões
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Correspondence to Jacinta Mullins.

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J. Mullins and F. Ascensão are joint first authors and have contributed equally to the work.

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Mullins, J., Ascensão, F., Simões, L. et al. Evaluating connectivity between Natura 2000 sites within the montado agroforestry system: a case study using landscape genetics of the wood mouse (Apodemus sylvaticus). Landscape Ecol 30, 609–623 (2015). https://doi.org/10.1007/s10980-014-0130-z

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