Buscar
Mostrando ítems 21-30 de 40
The Role of Hatching Asynchrony in a Seabird Species Exhibiting Obligate Brood Reduction
(Waterbird Society, 2017-09)
Brood reduction is a within-brood partial mortality due to sibling rivalry, and, in some species, the death of at least one sibling in the brood is almost guaranteed (obligate brood-reducers). Imperial Cormorants (Phalacrocorax ...
Breeding experience and foraging behaviour of Imperial Shags (Leucocarbo atriceps) in Argentina
(Csiro Publishing, 2014-03)
Breeding success depends on efficient foraging behaviour by breeding individuals. However, foraging skills are acquired over time and foraging behaviour is expected to be optimised over the course of successive breeding ...
Biología reproductiva de los cormoranes Imperial (Phalacrocorax atriceps) y Cuello Negro (P. magellanicus) en el Golfo San Jorge, Chubut, Argentina
(Aves Argentinas, 2003-12)
Estudiamos la biología reproductiva de los cormoranes Imperial Phalacrocorax atriceps y Cuello Negro P. magellanicus en el Golfo San Jorge, Argentina, durante las temporadas reproductivas de 1991 a 1993. Los fechas en que ...
Population trends of Imperial Cormorants (Leucocarbo atriceps) in northern coastal Argentine Patagonia over 26 years
(Taylor & Francis, 2020-04)
Monitoring programmes are essential for detecting population changes, but data series are difficult to sustain over time. Additionally, wide-scale monitoring is needed to adequately interpret demographic behaviour given ...
Sexual segregation in timing of foraging by imperial shags (Phalacrocorax atriceps): is it always ladies first?
(Springer Verlag Berlín, 2013-03-01)
The time seabirds have to forage is restricted while breeding, as time at sea must be balanced against the need to take turns with the partner protecting the nest site or offspring, and timing constraints change once the ...
Differences between colonies and chick-rearing stages in Imperial Cormorant (Phalacrocorax atriceps) diet composition: Implications for trophic studies and monitoring
(Wilson Ornithological Society, 2018-03)
We assessed differences in diet composition between Imperial Cormorants (Phalacrocorax atriceps) breeding at Isla Arce and Isla Vernaci Este, Golfo San Jorge, Argentina. Both colonies are located within the Patagonia Austral ...
A new anisakid species parasitizing the imperial cormorant Phalacrocorax atriceps from the north Patagonian coast, Argentina
(American Society of Parasitologists, 2008-08)
The anisakid species Contracaecum chubutensis n. sp. was found parasitizing the imperial cormorant Phalacrocorax atriceps at 2 different localities, Bahía Bustamante (45°11'S, 66°30'W) and Puerto Madryn (42°47'S, 65°02'W) ...
Moving towards acceleration for estimates of activity-specific metabolic rate in free-living animals: the case of the cormorant
(Wiley Blackwell Publishing, Inc, 2006-09)
1. Time and energy are key currencies in animal ecology, and judicious management of these is a primary focus for natural selection. At present, however, there are only two main methods for estimation of rate of energy ...
Cormoranes de la Costa Patagónica: Estado Poblacional, Ecología y Conservación
(Asociación Ornitológica del Plata, 2005-12)
A lo largo de la costa de Argentina nidifican cinco especies de cormoranes: el Cor-morán Imperial (Phalacrocorax atriceps), el Cormorán Cuello Negro (Phalacrocorax magellanicus), elCormorán Gris (Phalacrocorax gaimardi), ...
Effect of anthropic activity on the Imperial Cormorants and Rock Shags colonies in the Beagle Channel, Tierra del FuegoEfectos de la actividad antrópica sobre las colonias del Cormorán Imperial y Cormorán de las Rocas en el Canal Beagle, Tierra del Fuego
(Instituto de Oceanología, 2013-04)
Las aves marinas son importantes componentes del ecosistema marino y para las economías locales a través del ecoturismo. Distintas fuentes de disturbio humano pueden afectar a estas aves, causando un decrecimiento en el ...