| Titre : | [Body mass dynamics of migratory Reed Warblers (Acrocephalus scirpaceus) at a lake in northern Germany.] (2001) |
| Auteurs : | Stefan Braeger, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (41(2) 2001) |
| Article en page(s) : | 109-118 |
| Langues: | Allemand |
| Résumé : | In the years 1995, 1998, 1999, and 2000, a total of 860 Reed Warblers (89% immatures of the same year) were mistnetted in the reedbeds of lake Lankersee, northern Germany, during the months July to September at the start of the southward migration. The mean body mass was 12.08 g and varied significantly between years. Furthermore, in each of three years, adult birds were significantly heavier by 0.7-0.9 g than immatures. Immature birds were significantly heavier by 0.8-1.2 g in the afternoon and evening (16.30 h-22.30 h) than in the morning (05.30 h-11.30 h). In each of the four years, 12-26% of the Reed Warblers were caught repeatedly after 1-37 days (median=3-4 days for final recaptures). In two years, birds caught more than once were significantly heavier at initial weighing than those caught only once (and presumed to have started migration shortly thereafter). In the other two years the mean weights did not differ significantly. In the absence of any continuous increase in mean body mass, these results indicate a lack of any premigratory fattening in Reed Warblers of northern Germany which appear to migrate at least to the Belgian stop-over sites (500 km to the southwest) with relatively low body masses. These results agree with premigratory body masses of seven individuals recaught after a few days in Belgium and France as well as with the body mass dynamics of migratory Reed Warblers at other ringing stations. |
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