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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Effect of plot type, age and date on seed depletion and bird use of Wild Bird Seed Mixtures in England (2014)
Auteurs :	Jennifer A. Bright, Auteur ; Rob H. Field, Auteur ; Antony J. Morris, Auteur ; Andrew I. Cooke, Auteur ; Jeremy Fern, Auteur ; Philip V. Grice, Auteur ; Will Peach, Auteur
Type de document :	Article
Dans :	Bird Study (61(4) OCT 2 2014)
Article en page(s) :	518-526
Résumé :	Capsule Bird and seed abundances decreased in both standard and enhanced Agri-Environment Scheme seed mixtures (plots of seed-bearing crops) between November and February. Aims We analysed effects of Agri-Environment seed mixture type ('standard' or 'enhanced'), plot age and non-target species on seed and bird abundance. Methods Surveys were conducted in November/December and January/February on 36 standard and 19 enhanced seed mixtures to test effect of plot type and age on abundance of buntings, finches and seeds. Results Bunting and finch densities decreased between January/February and November/December. Seed decreased by approximately 70% between surveys, plot type did not affect depletion. Second-year plots contained nearly 90% less seed, and non-significantly lower bunting and finch densities. Bunting densities were positively related to cereal seed abundance, and finch densities to non-cereal seed; these relationships did not differ between plot types. There was no evidence that non-target species affected use of seed mixtures by target species. Conclusion There was no evidence that plot type affected seed or bird abundances. Increased quality and uptake of Agri-Environment Scheme seed-rich habitats (seed mixtures and over-winter stubbles, possibly alongside well-implemented supplementary feeding) is needed to provide late-winter seed, especially cereals for species of conservation concern.

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