Aves, p�le ornithologique de Natagora

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Aves, 42/4 | 2005 | 313-324

  Evolution of the breeding population of the Great Cormorant (Phalacrocorax carbo) in the western part of Wallonia (Belgium, Hainaut Province) between 1992 and 2005.
Jenard, Ph.

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Article summary

In the context of the large increase of the European population of Great Cormorant (Phalacrocorax carbo sinensis), a breeding population colonised the western part of Wallonia (Belgium, Hainaut Province) in 1992. This population now amounts to 443 occupied nests in 2005, distributed in two colonies, Obourg and Hensies. The Obourg colony is settled in an abandoned quarry filled with water. The Hensies colony consist in two well distinct sub-colonies along a large semi-natural freshwater pond, one of the two sub-colonies being split in several nest groups, each of them with their own population dynamic. The high number of fledged youngs and the rapid increase of occupied nests observed in both colonies suggest that this population produced, from 1998 onwards, an excess of adults which has not been absorbed by the growth of the colonies or the foundation of neighbouring new colonies. Some observation about feeding grounds used by the breeding cormorant of these two colonies and inter-specific relationships are discussed.

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