Aves, p�le ornithologique de Natagora

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Aves, 28/2-3 | 1991 | 107-126

  Results of the operation of the first two years of the S.T.O.C. program in Northern France.
Raevel, P.

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In the srping of 1989 the annual S.T.O.C. program was set up to monitor the level of abundance of breeding populations of common birds in France. This paper summarizes the first two years' operating of the "netting" activity of this research program in Northern France, with three study sites : Nieppe Forest, Mardyck Fort and Camiers. The principle consists of the capture-ringing-recapture technique in small sites (less than 20 hectares) with a heavy rate of capture, such action being limited in time. 3,600 birds were caught in the first year, 3,100 in the second, representing 55 species. Capture results were the same for all three sites (about seven birds per net per session) with a slight global drop between 1989 and 1990. The species most captured are the Sylviidae (Warblers) : Willow Warbler, Chiffchaff, Garden Warbler, Blackcap, Whitethroat and Reed Warbler. Numbers are high in all three sites. The young to adult ratio was very weak for both years : 0.36 in 1989 and 0.13 in 1990 - this in all the sites. The return rates are higher, in general, than those of the whole of France.

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