Aves, p�le ornithologique de Natagora

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Aves, 49/1 | 2012 | 53-57

  Optimizing the count of a cormorant breeding colony : lessons learned from the detailed observation of the Great Cormorants Phalacrocorax carbo in the wetland of biological interest of Harchies-Hensies-Pommerœul
Philippe Jenard

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Article summary

In 2005 a census was carried out on average every 4 days (26 visits over 109 days) of  the 5 subcolonies of Great Cormorant Phalacrocorax carbo in the wetland of biological interest of Harchies-Hensies-Pommerœul (50° 27’ N, 3° 41’ E)The longest interval between 2 successive counts never exceeded 6 days. Such accuracy allows various analyses amongst which a phenological analysis aimed at identifying the optimal periods to estimate the occupancy rate of a cormorant breeding colony. Indeed, in most cases, and certainly not seasons after seasons, it is not possible to survey so finely and so regularly a colony, so it is necessary to optimize the time of counting.

Articles on the same species

Grand Cormoran
Phalacrocorax carbo

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