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Documents disponibles écrits par cet auteur (5)
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Article
L. Garcia, Auteur ; J. A. Amat, Auteur ; A. Sanchez, Auteur
Article
J. A. Amat, AuteurRed-crested Pochards (Netta rufina) have been observed feeding on plants brought by their mates to the water surface, and this behaviour has been traditionally considered as courtship feeding. In this paper I report on this behaviour and examine[...]
Article
J. A. Amat, AuteurA small percentage (4.5%) of females Kentish plovers (Charadrius alexandrinus) observed breeding in southern Spain expressed a plumage trait characteristic of males: the forecrown (frontal) black bar. The expression of this male trait may be age[...]
Article
J. A. Amat, Auteur ; L. M. Carrascal, Auteur ; J. Moreno, AuteurWe manipulated clutches of Chinstrap Penguins to examine the effects of brood size and offspring age on brood defence le, els. Nest defence intensity increased with increasing offspring age, Experimental birds reduced nest defence intensity afte[...]
Article
J. A. Amat, Auteur ; R. M. Fraga, Auteur ; G. M. Arroyo, AuteurDans Ardea (89(2) 2001)Offspring size is a very important life-history trait that may be affected by maternal effects and environmental conditions. We studied variation in egg size and within-clutch symmetry variation in egg volume in Kentish Plovers Charadrius alexan[...]
