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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The Black Stork (Ciconia nigra) in Madrid region: status, population changes and reproduction
Auteurs :	Luis Santiago Cano Alonso, Auteur ; Manuel Fernandez, Auteur
Type de document :	Article
Dans :	Aves (40(1-4) 2003)
Article en page(s) :	38-44
Résumé :	The population of Black Stork has augmented gradually since, at the end of the 1980s, its reproduction in the area was observed, increasing from 2 pairs in 1992, to 12 in 2000. 38.46% out of 65 confirmed attempts of reproduction were carried out on rock, and 61.54% on trees; we observed inter-species competition for the occupation of Black Stork nests on rock, by Griffon Vulture. The reproductive period of Black Stork in Madrid region ranges from the first week of March, when the laying of the first pairs begins, until the end of August, when the last young fly. Predominantly, it occupies woodlands as nesting areas, in supramediterranean bioclimatic layers (higher altitude, lower temperatures) as well as in mesomediterranean layers (lower altitude, milder temperatures) The pairs in the mesomediterranean zone mainly select the month of March for their laying, though they may also use the month of April, while the layings of pairs breeding in the supramediterranean layer are more concentrated in time, in April. Neither the date of the laying nor the bioclimatic zone is related to a higher breeding success, the pairs just adapt themselves to the environmental conditions to carry out their laying. During these 10 years there was a mean of 77.66% productive pairs; 168 young were born, 3 being the most frequent number of young born to a pair. The mean productivity during this period was of 2.32 flown young/stable pair, the reproductive success being 2.53 young able to fly/breeding pair, and the fledging rate of 2.98 young/number of pairs that managed to make their young fly. These data are superior to those from other areas of the Iberian Peninsula. Because of these reproduction parameters, we come to the conclusion that the Black Stork population of the region will stay stable in the next years.

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