Population spatial structuring on the feeding grounds in North Atlantic humpback whales (Megaptera novaeangliae)

摘要: Population spatial structuring among North Atlantic humpback whales Megaptera novaeangliae on the summer feeding grounds was investigated using movement patterns of identified individuals. We analysed results from an intensive 2-year ocean-basin-scale investigation resulting in 1658 individuals by natural markings and 751 genetic markers supplemented with data a long-term collaborative study 3063 markings. Re-sighting distances ranged 2200 km. The frequencies (F) re-sighting (D) observed consecutive years were best modelled inverse allometric function (F=6631D(-1.24), r(2)=0.984), reflecting high levels site fidelity (median distance 550 km). distribution differed east west 45 degrees W, more long-distance east. This difference is consistent regional prey predictability. Four aggregations identified: Gulf Maine, eastern Canada, West Greenland Atlantic. There exchange rate 0.98% between western aggregations. prevalence made delineation possible additional less clear. Limited sites separated as little tens kilometres produced lower-level within all Regional temporal differences reflected similar foraging responses to varying availability A negative relationship shown relative abundance herring sand lance Maine whale Canada.