Growth Energetics of Nestling Northern Gannets (Sula bassanus)

Meta-population evidence of oriented chain migration in northern gannets (Morus bassanus)

Pursuit plunging by northern gannets (Sula bassana) feeding on capelin (Mallotus villosus).

Northern gannets (Sula bassana) are considered to obtain prey usually by rapid, vertical, shallow plunge dives. In order to test this contention and investigate underwater foraging behaviour, we attached two types of data-logging systems to 11 parental northern gannets at Funk Island in the North-Wiest Atlantic. We documented, for the first time to the authors' knowledge, gannets performing lon...

Food Consumption and Growth Energetics of Nestling Golden Eagles

AasTaAcT. -Food consumption, energy metabolism, and growth of 12 wild Golden Eagle (Aquilu chrysaetos) chicks were compared with 4 captive chicks to evaluate the influence of food availability and sibling interaction on growth in wild nestlings. Captive female and male eaglets consumed and assimilated similar amounts of black-tailed jack rabbit (Lepus calijbrnicus). A linear relationship betwee...

Contrasting foraging tactics by northern gannets (Sula bassana) breeding in diVerent oceanographic domains with diVerent prey Welds

In order to forage and to provision oVspring eVectively, seabirds negotiate a complex of behavioural, energetic, environmental and social constraints. In Wrst tests of GPS loggers with seabirds in North America, we investigated the foraging tactics of free-ranging northern gannets (Sula bassana) at a large and a mediumsized colony that diVered in oceanography, coastal position and prey Welds. G...

Predation on marine-phase Atlantic salmon (Salmo salar) by gannets (Morus bassanus) in the Northwest Atlantic

Predation on Atlantic salmon (Salmo salar) has been recorded in rivers and estuaries, but there is little documentation of predation at sea. Prey landed by gannets (Morus bassanus) over 24 years in a large colony off northeast Newfoundland included small proportions of post-smolt Atlantic salmon. Before 1990, when shifts in oceanographic conditions and pelagic food webs occurred in the Labrador...