Winter feeding of the Crane in cereal farmland at Gallocanta, Spain

摘要: The numbers, distribution and feeding habits of Cranes Grus grus were studied in relation to food availability a cereal-growing farmland at Laguna de Gallocanta, Spain, from October 1981 March 1983. seasonal variation patterns bird numbers are similar, both showing peaks autumn spring minimum January. correspondence is higher zones adjacent the roost, suggesting that birds prefer forage as close roost possible. Poor conditions mid-winter determine decrease mean flock size dispersion birds, well reduction wintering population size. utilize cultivated ground natural grasslands areas. Sunflower stubble fields strongly selected autumn, while cereal sown mainly utilized respectively. Natural positively selected.