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  • 1.
    Sanchez Tortosa, Francisco
    et al.
    Departamento de Biología Animal, Edificio C-1, Campus de Rabanales, Universidad de Córdoba, 14071.
    Pérez, Lorenzo
    Departamento de Biología Animal, Edificio C-1, Campus de Rabanales, Universidad de Córdoba, 14071.
    Hillström, Lars
    University of Gävle, Department of Mathematics, Natural and Computer Sciences, Ämnesavdelningen för naturvetenskap.
    Effect of food abundance on laying date and clutch size in the White Stork Ciconia ciconia2003In: Bird Study, ISSN 0006-3657, E-ISSN 1944-6705, Vol. 50, p. 112-115Article in journal (Refereed)
    Abstract [en]

    Capsule- Food independently affects both laying date and clutch size, suggesting that seasonal decline in clutch size is related to a decrease in food availability.

    Aim - To test the effect of food abundance on laying date and clutch size of the White Stork and identify the cause of seasonal decline in the number of eggs laid.

    Methods - During 1991 and 1996 we recorded clutch size and laying date of pairs breeding next to rubbish dumps (food abundant and constant throughout the breeding season) and birds breeding far from rubbish dumps (using natural food sources).

    Results - In 1991 there was no difference in mean laying date between pairs nesting at rubbish dumps and control pairs. Clutch size was significantly larger at rubbish dump nests. In contrast, mean laying date was earlier in control pairs in 1996 and there was no significant differences in clutch sizes, even when controlling for laying date effect.

    Conclusion - The results support the hypothesis that food availability independently affects both laying date and clutch size. The seasonal decline in clutch size close to rubbish dumps was negligible (1991) or much smaller than in the control zone (1996) suggesting that a progressive deterioration of natural food sources is the most probable reason for a decline in clutch size as the season advances.

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