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1 December 2013 Breeding Productivity in Relation to Nesting Substrate and Nest Site Accessibility to Humans in the Black Stork Ciconia Nigra
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Abstract

The black stork Ciconia nigra is a threatened tree-nesting species in Europe. The relatively poorly studied and isolated Iberian population is unusual in Europe in that the majority of known pairs are cliff-nesting. This permits the analysis of productivity differences in relation to nesting substrate in different subpopulations, comparing not only the mean number of fledged chicks/nest between cliff-nesting and tree-nesting pairs but also considering whether the nests are located in restricted- or open-access areas. The results reveal that nesting substrate does not determine differences in productivity. Only those cliff-nesting pairs that breed in open-access areas have significantly lower productivity than pairs that breed elsewhere. Therefore, whether or not black storks nest on cliffs and on trees should not have a relevant effect per se on the productivity of the species but such an effect may arise in relation to the degree of human access to the cliff-nesting sites. Further in-depth research is needed about the exact causes of lower productivity in pairs that nest on cliffs located in open-access areas.

Luis Santiago Cano-Alonso and José Luis Tellería "Breeding Productivity in Relation to Nesting Substrate and Nest Site Accessibility to Humans in the Black Stork Ciconia Nigra," Ardeola 60(2), 357-363, (1 December 2013). https://doi.org/10.13157/arla.60.2.2013.357
Received: 20 December 2012; Accepted: 4 April 2013; Published: 1 December 2013
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