Is there an optimum scale for predicting bird species’ distribution in agricultural landscapes?
2014
Pelosi, Céline | Bonthoux, Sébastien | Castellarini, Fabiana | Michel, Goulard | Ladet, Sylvie | Balent, Gerard | Physicochimie et Ecotoxicologie des SolS d'Agrosystèmes Contaminés (PESSAC) ; Institut National de la Recherche Agronomique (INRA) | Dynamiques Forestières dans l'Espace Rural (DYNAFOR) ; Institut National de la Recherche Agronomique (INRA)-École nationale supérieure agronomique de Toulouse (ENSAT) ; Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT)-Université de Toulouse (UT) | Cités, Territoires, Environnement et Sociétés (CITERES) ; Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS) | Instituto Multidisciplinario de Biología Vegetal [Córdoba] (IMBIV) ; Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Facultad de Ciencias Exactas, Físicas y Naturales [Córdoba] (FCEFyN) ; Universidad Nacional de Córdoba [Argentina]-Universidad Nacional de Córdoba [Argentina] | ANR-07-BDIV-0002,BIODIVAGRIM,Conservation de la biodiversité dans les agro-écosystèmes une modélisation spatialement explicite des paysages(2007)
Changes in forest cover in agricultural landscapes affect biodiversity. Its management needs some indications about scale to predict occurrence of populations and communities. In this study we considered a forest cover index to predict bird species and community patterns in agricultural landscapes in southwestern France. We used generalized linear models for that purpose with prediction driven by wooded areas’ spatial distribution at nine different radii. Using 1064 point counts, we modelled the distribution of 10 bird species whose habitat preferences are spread along a landscape opening gradient. We also modelled the distribution of species richness for farmland species and for forest species. We used satellite images to construct a ‘wood/non-wood’ map and calculated a forest index, considering the surface area of wooded areas at nine radii from 110 m to 910 m. The models’ predictive quality was determined by the AUC (for predicted presences) and r (for predicted species richness) criteria. We found that the forest cover was a good predictor of the distribution of seven bird species in agricultural landscapes (mean AUC for the seven species ¼ 0.74 for the radius 110 m). Species richness of farmland and forest birds was satisfactorily predicted by the models (r ¼ 0.55 and 0.49, respectively, for the radius 110 m). The presence of the studied species and species richness metrics were better predicted at smaller scales (i.e. radii between 110 m and 310 m) within the range tested. These results have implications for bird population management in agricultural landscapes since better pinpointing the scale to predict species distributions will enhance targeting efforts to be made in terms of landscape management.
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