Vegetation structure influences foraging decisions in a declining grassland bird : the importance of fine-scale habitat and grazing regime
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Capsule: Whinchat Saxicola rubetra foraging behaviour was significantly influenced by habitat structure and grazing. Aims: To assess how foraging habitats selected by breeding Whinchats differed from wider territory attributes under contrasting grazing management in multiple upland areas in Scotland: principally sheep grazed, Red Deer grazed or ungrazed, and to identify how differing land use may limit suitable foraging areas. Methods: We compared fine-scale vegetation structure in patches chosen for foraging by Whinchats in contrasting grazing management regimes. Results: Whinchats were less likely to forage in patches with a greater cover of bracken and tall non-bracken vegetation, regardless of grazing regime. Grass cover influenced foraging behaviour in ungrazed habitats only, where Whinchats were less likely to forage in areas with high grass cover. Conclusion: Whinchats appear to require a mosaic or range of sward structures within breeding territories, highlighting the importance of establishing how vegetation structure influences breeding birds at different spatial scales. Our results suggest that suitable foraging patches were plentiful within grazed habitats but potentially limited in ungrazed habitats. Further work is needed to identify management regimes and interventions to maintain conditions suitable for breeding Whinchats that are compatible with other land use and conservation objectives.
Murray , C , Minderman , J , Allison , J & Calladine , J 2016 , ' Vegetation structure influences foraging decisions in a declining grassland bird : the importance of fine-scale habitat and grazing regime ' Bird Study , vol 63 , no. 2 , pp. 223-232 . DOI: 10.1080/00063657.2016.1180342
© 2016, British Trust for Ornithology. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.tandfonline.com / https://dx.doi.org/10.1080/00063657.2016.1180342
Funding: British Trust for Ornithology (BTO) Research Grant.
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