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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Goldcrests (Regulus) - a challenge for birdwatching and monitoring at a small scale
Auteurs :	Einhard Bezzel, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (49(2-3) DEC 2010)
Article en page(s) :	149-164
Résumé :	Goldcrests (Regulus) - a challenge for birdwatching and monitoring at a small scaleAt Garmisch-Partenkirchen/Bavaria in the Northern Alps of Germany, data on Goldcrests (Regulus regulus) and Firecrests (R ignicapillus) were collected by long-term recording over long periods Methods employed daily checks and 2285 days of mist-netting between 1966 and 2008 at a study plot of ca 8 ha, one line transect on the southern and one on the northern slope from 1980 until 1999, line transects in the village in 2006 - 2008 770 - 1000 m asl At the border between upland forest and outlying houses and gardens of the village Firecrests (F) were recorded probably breeding in at least 41, Goldcrest (G) in at least 39 years In both species, song decreased from a peak at the beginning of the breeding season the graph showing a steep left curve Song in autumn (subsong' excluded) was heard m both species equally frequently till mid-October First individuals of F were recorded 2 7 days earlier per decade, last individuals 5 1 days later Along line transects from valley to lower subalpine forest the abundance of G was lower than that of F, the rate of detection, however, was nearly identical in both species On average only 46% of singing territorial males were recorded during a single count along a transect, 65-69% at a maximum At least 6 visits per transect were needed between early April and late June to reach 100% of territories recorded per year For G there was a positive correlation between number of individuals encountered in winter and in the bleeding season In summer, proportionally more individuals of both species were found in closed forest than during migration periods This may influence the seasonal detectability In some years no or very few G were present during winter, but no relation with time and/or temperature or snow cover was found The number of breeding pairs has decreased in both species along the two line transects Local, actors (i e fallen spruce trees after storms) may explain this Of all the years with probable breeding, this could be confirmed for F in 38% and for G in 24% (mostly by seeing families with newly fledged young) Within the village single F were found in gardens dining the breeding season, but not on migration, whereas single G appeared only outside the breeding season Long-term observations over several years, including outside the breeding season may lead to imoroved under, tanding of breeding populations

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