| Publication Type: | Journal Article |
| Year of Publication: | 1988 |
| Authors: | Herremans, M |
| Journal: | Ringing & Migration |
| Volume: | 9 |
| Issue: | 2 |
| Date Published: | 1988 |
| ISBN Number: | 0307-8698 |
| Keywords: | Belgium, Calobates cinereus, Europe, Motacilla, Motacilla caspica, Motacilla cinerea, Motacillidae, Western Europe |
| Abstract: | Active migration of Grey Wagtails was studied intensively during three autumns (1980, 1982, 1984) and partly during 1985 at an inland site in central Belgium. The total number of migrants observed was 720, and 416 birds were trapped. The most important passage was found during September and peaks occurred in the last fortnight of September and the first week of October. There was hardly any seasonal shift between years. This, together with the small overall shift in timing of passage over the whole range of distribution in western Europe points towards long?distance migratory behaviour. The extent of postjuvenile moult is described for greater?coverts, rectrices, tertials, alula?feathers and the carpal covert. Eighteen juveniles were trapped on migration when still obviously growing new body?feathers. There was a sharp decline in the mean extent of renewal of greater?coverts, rectrices and tertials for all successive sub?samples in the course of the autumn, which is mainly due to a gradual influx of birds with little additional postjuvenile moult. These were probably of mainly northern origin. There is generally little variation in Grey Wagtail measurements.Active migration of Grey Wagtails was studied intensively during three autumns (1980, 1982, 1984) and partly during 1985 at an inland site in central Belgium. The total number of migrants observed was 720, and 416 birds were trapped. The most important passage was found during September and peaks occurred in the last fortnight of September and the first week of October. There was hardly any seasonal shift between years. This, together with the small overall shift in timing of passage over the whole range of distribution in western Europe points towards long?distance migratory behaviour. The extent of postjuvenile moult is described for greater?coverts, rectrices, tertials, alula?feathers and the carpal covert. Eighteen juveniles were trapped on migration when still obviously growing new body?feathers. There was a sharp decline in the mean extent of renewal of greater?coverts, rectrices and tertials for all successive sub?samples in the course of the autumn, which is mainly due to a gradual influx of birds with little additional postjuvenile moult. These were probably of mainly northern origin. There is generally little variation in Grey Wagtail measurements. |
| URL: | http://dx.doi.org/10.1080/03078698.1988.9673933 |
| Short Title: | Ringing & Migration |
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