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Article
Barrionuevo Melina, Auteur ; Simeon Lisovski, Auteur ; Annick Morgenthaler, Auteur ; Ana Millones, Auteur ; Esteban Frere, AuteurMany seabirds adjust migratory movements to interannual oceanic variability, tracking food resources, and potentially avoiding competition. This study examines the at-sea ecological niches of two penguin species, their overlap across years, and [...]
Article
Heloisa Helena Linhares, Auteur ; Esteban Frere, Auteur ; Ana Milliones, Auteur ; Gisele Pires de Mendonça Dantas, AuteurKelp Gull is the most abundant gull species in the Southern Hemisphere, occurring in South America, Africa, New Zealand, Australia, Sub-Antarctic Island, and Antarctica Peninsula. There is no consensus about the number of subspecies; some studie[...]
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Anna Carolina Milo Marasco, Auteur ; João Stenghel Morgante, Auteur ; Melina Barrionuevo, Auteur ; Esteban Frere, Auteur ; Gisele Pires de Mendonça Dantas, AuteurMolecular studies have shown that, although most avian species are socially monogamous, they can exhibit different reproductive strategies, such as extra-pair paternity (EPP) and intraspecific brood parasitism (IBP). We investigated the genetic [...]
Article
Annick Morgenthaler, Auteur ; Ana Millones, Auteur ; Patricia Gandini, Auteur ; Esteban Frere, AuteurThe available information about the feeding habits and preferences of the Red-legged Cormorant (Phalacrocorax gaimardi) generally suggests that this near-threatened South American cormorant is a sedentary benthic forager that also incorporates p[...]
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Melina Barrionuevo, Auteur ; Esteban Frere, AuteurCapsule: Most bird species start full incubation before the clutch is complete, others long after laying the last egg, gradually increasing the incubation temperature as incubation progresses, as is the case in Magellanic Penguins Spheniscus mag[...]
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Fernanda de Almeida Santos, Auteur ; João Stenghel Morgante, Auteur ; Esteban Frere, Auteur ; Ana Millones, Auteur ; Martin Sander, Auteur ; Juliana de Abreu Vianna, Auteur ; Gisele Pires de Mendonça Dantas, AuteurThe high dispersal ability of seabirds and the absence of geographical barriers has led to high gene flow and reduced population differentiation. Nevertheless, some species with philopatric behavior have restricted gene flow among colonies, reve[...]
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Javier Ciancio, Auteur ; Florencia Botto, Auteur ; Esteban Frere, AuteurThe Magellanic Penguin (Spheniscus magellanicus) is the most abundant and widely distributed top marine predator of Atlantic Ocean waters off the Patagonian coast. During the breeding season, this species consumes thousands of tonnes of its prey[...]
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Ana Millones, Auteur ; Patricia Gandini, Auteur ; Esteban Frere, AuteurThe world population of Red-legged Cormorant Phalacrocorax gaimardi is reasonably small and has showed rapid declines. In Argentina, this species breeds in 13 localities and is considered as Endangered' by the national government. In this study,[...]
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Patricia Gandini, Auteur ; Esteban Frere, AuteurSeabird mortality in longline fisheries is believed to be an important cause of the reductions in many seabird populations worldwide, and results in reduced fishing efficiency and economic losses for fishing companies. We estimated the economic [...]
Article
Melina Barrionuevo, Auteur ; Esteban Frere, AuteurIn birds, the adaptive significance of hatching asynchrony has been under debate for many years and the parental effects on hatching asynchrony have been largely assumed but not often tested. Some authors suggest that hatching asynchrony depends[...]
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Melina Barrionuevo, Auteur ; Esteban Frere, AuteurIn many bird species, eggs in a brood hatch within days of each other, leading to a size asymmetry detrimental to younger siblings. Hatching asynchrony is often thought of as an adaptive strategy, and the most widely studied hypothesis in relati[...]
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Juan E. Sala, Auteur ; Rory P. Wilson, Auteur ; Esteban Frere, Auteur ; Flavio Quintana, AuteurSeabirds have to deal with environmental variability and are predicted to modulate foraging behavior to maximize fitness, with particularly strong selection pressure for optimal behavior during chick provisioning when energy demands are high. We[...]
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Esteban Frere, Auteur ; Flavio Quintana, Auteur ; Patricia Gandini, Auteur ; Rory P. Wilson, AuteurRadiotelemetry was used to assess the distribution and diving behaviour of Rock Shags Phalacrocorax magellanicus and Red-legged Cormorants Phalacrocorax gaimardi breeding in sympatry, and Rock Shags breeding in isolation. When breeding in sympat[...]
