Aves, p�le ornithologique de Natagora

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Aves, 38/1 | 2001 | 27-44

  Breeding of Black-headed Gull (Larus ridibundus) in the marsh complex of Harchies-Hensies-Pommeroeul from 1972 to 1999.
Loison, M. & Godin, J.

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Article summary

Black-headed Gull was a regular breeder in the marsh complex of Harchies-Hensies-Pommeroeul from 1972 to 1986. After a gap of 12 years, the site was occupied again in 1999. The breeding population grew to about 150 pairs in 1975, 500 pairs in 1979, and culminated to about 1.000 pairs in 1985. Limitation measures by egg removal were organised from 1982, followed by egg injection with formol in 1985 and 1986. Rather than those operations however, the site desertion seems to be due to various factors such as the evolution of the milieu and, foremost, disturbances. Observation data (history of installation, numbers, colony localisation, reproduction chronology, perturbation factors during breeding : disturbances, predation, competitors and commensals) as well as ringing data (organisation, numbers, length of time with ring, geographical distribution of recoveries, distance and directions) are presented and commented.

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