1973
DOI: 10.3406/revec.1973.4713
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Déplacements saisonniers des Fous de Bassan de l’ile Bonaventure (Canada)

Abstract: Plus de 11000 jeunes Fous de Bassan (Sula bassana) ont été bagués sur l’Ile Bonaventure (48°3’N., 64°1’W., Province Québec) et 417 retours ont été enregistrés et analysés. La distribution géographique des retours indique que la voie de migration des Fous de Bassan est exclusivement côtière. En automne, peu après la fin de la reproduction, juvéniles, sous-adultes et adultes partent ensemble vers les latitudes chaudes, au moment où leurs proies migrent vers le large et avant que les conditions météorologiques so… Show more

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“…Nor can the decline be explained by changes in the physical structure of the cliff-face (produced by erosion and other similar factors) making it less suitable for nesting; the physical features of all the nesting areas appear unchanged (based upon examination of aerial photographs and ground observations). There is also little evidence to indicate an increased emigration of Bonaventure-reared birds to other Gannet colonies in eastern Canada (see Moisan and Scherrer 1973) as has been suggested for the growth of certain colonies in east Newfoundland (Tuck 1960). Two main classes of factors seem possible to explain the decrease: either changes in certain properties at the colony, and/or changes in the food supply (quantity and/or quality) at sea.…”
Section: Population Changesmentioning
confidence: 99%
“…Nor can the decline be explained by changes in the physical structure of the cliff-face (produced by erosion and other similar factors) making it less suitable for nesting; the physical features of all the nesting areas appear unchanged (based upon examination of aerial photographs and ground observations). There is also little evidence to indicate an increased emigration of Bonaventure-reared birds to other Gannet colonies in eastern Canada (see Moisan and Scherrer 1973) as has been suggested for the growth of certain colonies in east Newfoundland (Tuck 1960). Two main classes of factors seem possible to explain the decrease: either changes in certain properties at the colony, and/or changes in the food supply (quantity and/or quality) at sea.…”
Section: Population Changesmentioning
confidence: 99%