| Popis: |
The Greater White-fronted Goose Anser albifrons has recently begun to winter at Lake Otomonuma (Akita Prefecture), a migratory stop-over site located 180 km northwest of its main wintering site at Lake Izunuma–Uchinuma (Miyagi Prefecture), in northern Honshu, Japan. Data collected over a 17-year period (from 1987/1988 to 2003/2004) have allowed us to analyze factors influencing the large-scale redistribution of this species. The number of geese in Akita increased during November and December, but decreased in January. The number of geese wintering in Akita from November to December was not correlated with the number wintering in Miyagi; therefore, migration from the breeding area or from northern staging sites seems to have caused the population to increase in Akita in December. The population in Akita decreases with low temperatures in January; however, the decrease in Akita was not correlated directly with an increase in Miyagi from December to January as the geese also visit other more souther... |
