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Trans‐equatorial migration and mixing in the wintering areas of a pelagic seabird
Despite increasing interest in long-distance migration, the wintering areas, migration corridors, and population mix in winter quarters of most pelagic marine predators are unknown. Here, we presentExpand
Sexual dimorphism and sexual segregation in foraging strategies of northern giant petrels, Macronectes halli, during incubation
The results indicate that sex-specific differences in fasting endurance, contest competition over food and flight metabolic rates are key elements in maintenance of sexual size dimorphism, segregating foraging strategies and presumably reducing competition between sexes. Expand
Feather mercury levels in seabirds at South Georgia: influence of trophic position, sex and age
We studied the mercury contamination of 13 species of seabirds breeding on Bird Island, South Georgia, in 1998. Total mercury concentrations in body feather samples of birds caught at their breedingExpand
Ocean Surface Winds Drive Dynamics of Transoceanic Aerial Movements
This study provides a novel approach to investigate wind-mediated movements in oceanic environments and shows that large-scale migration and dispersal processes over the oceans can be largely driven by spatiotemporal wind patterns. Expand
Multicolony tracking reveals the winter distribution of a pelagic seabird on an ocean basin scale
Aim: An understanding of the non-breeding distribution and ecology of migratory species is necessary for successful conservation. Many seabirds spend the non-breeding season far from land, andExpand
Sympatric speciation by allochrony in a seabird
Oceanodroma castro (the Madeiran or band-rumped storm-petrel) is a small seabird that nests on tropical and subtropical islands throughout the Atlantic and Pacific Oceans, and the first evidence for sympatric speciation by allochrony in a tetrapod is found. Expand
Foraging partitioning between giant petrels Macronectes spp. and its relationship with breeding population changes at Bird Island, South Georgia
Foraging areas of giant petrels overlapped extensively with longline fishery distribution, highlighting their susceptibility to being caught on longline hooks, and females were at higher risk during the study period since they made longer trips and foraged further west than males, into areas where local longline fisheries are more active. Expand
Causes and consequences of individual variability and specialization in foraging and migration strategies of seabirds
The effects of season (breeding vs. nonbreeding periods), breeding stage, breeding status, age, sex and individual specialization on foraging and migration strategies, as well as the consequences for population dynamics and conservation are reviewed. Expand
Stable isotopes reveal trophic segregation by sex and age in the southern giant petrel in two different food webs
Stable isotope values of male and female chicks in Patagonia did not differ; both attained high values, similar to adult males and higher than adult females, suggesting that parents do not provision their single offspring differently in relation to sex; however, they seem to provide offspring with a higher proportion of carrion, probably of higher quality, and more abundant food, than they consume themselves. Expand
Metals and selenium as bioindicators of geographic and trophic segregation in giant petrels Macronectes spp.
We analysed concentrations of cadmium, lead, mercury and selenium in blood from males and females of the 2 sibling species of giant petrels, the northern Macronectes halli and the southern M.Expand