Behavioral and hormonal responses of Magellanic penguins (Spheniscus magellanicus) to tourism and nest site visitation

One of the results of human disturbance at seabird colonies may be the provocation of the typical vertebrate adrenocortical response to stressors, but there have been few studies that demonstrate this. The present study demonstrates that simple human presence at the nest site, without effects of capture or handling, is physiologically stressful for breeding Magellanic […]

State-dependent decisions in long-term fasting king penguins, Aptenodytes patagonicus, during courtship and incubation

Using an automatic identification and weighing system, we investigated changes in adult body mass in relation to reproductive behaviour during courtship and incubation in free-living king penguins. Despite stressful nutritional conditions and variability of fast length, the majority of pairs incubated successfully by accumulating large body reserves before fasting, which provided flexibility in fasting strategies. […]

Long-term fasting and re-feeding in penguins

Spontaneous fasting during reproduction (sometimes with a full stomach) and moult is a major characteristic of the annual cycle of penguins. Long-term fasting (up to four months in male emperor penguins) is anticipated by the accumulation of fat (incubation fast) and of fat and protein (moult fast). During most of the incubation fast, birds rely […]

Behavioral and Physiological Significance of Minimum Resting Metabolic Rate in King Penguins

Because fasting king penguins (Aptenodytes patagonicus) need to conserve energy, it is possible that they exhibit particularly low metabolic rates during periods of rest. We investigated the behavioral and physiological aspects of periods of minimum metabolic rate in king penguins under different circumstances. Heart rate (f(H)) measurements were recorded to estimate rate of oxygen consumption […]

Rush and grab strategies in foraging marine endotherms: the case for haste in penguins

The speed at which air-breathing marine predators that forage by diving should swim is likely to depend on a variety of factors that differ substantially from those relevant in animals for hich access to oxygen is unlimited. We used loggers attached to free-living penguins to examine the speed at which three species swam during periods […]

Hematology and plasma chemistry values in free-ranging Humboldt penguins (Spheniscus humboldti) in Chile

Abstract 10.1002/zoo.1430140403.abs To establish baseline hematologic and plasma biochemistry values in free-ranging Humboldt penguins (Spheniscus humboldti), heparinized blood samples were collected from 51 apparently healthy, adult Humboldt penguins residing at two colonies off the Chilean coast. Thirty samples were collected in April, 1992, from penguins inhabiting the Ex-islote de los Pájaros Niños in Algarrobo, Chile. […]

Aggressiveness in king penguins in relation to reproductive status and territory location

King penguins, Aptenodytes patagonicus, vigorously defend small territories in very dense colonies. The egg-laying season lasts approximately 4 months, but only pairs that reproduce during the first half of the period succeed in fledging a chick. I examined various factors affecting aggressiveness of king penguins during the breeding season and focused on the differences between […]

Aspergillosis: a limiting factor during recovery of captive magellanic penguins

The article describes the epidemiology, macroscopic and histological lesions as well as the isolation of Aspergillus flavus and A. fumigatus from Magellanic penguins (Spheniscus magellanicus) during recovery in the Center for Recovery of Marine Animals (CRAM – 32ºS/52ºW), over a period of two years. From January 2004 to December 2005 the Center received 52 Magellanic […]

Management of penguin populations in North American zoos and aquariums

The North American zoo community has made great strides towards collaborating in the management of captive penguins on the subcontinent. Organized captive management programmes such as that of the American Zoo and Aquarium Association Species Survival Plan (SSP) and Penguin Taxonomic Advisory Group (TAG) have enhanced the zoo community’s ability to contribute to penguin conservation […]

Morphological aspects of the heart of the northern rockhopper penguin (Eudyptes chrysocome moseleyi): possible implication in diving behavior and ecology?

We compared the heart morphology of the small, deep-diving northern rockhopper penguin to the hearts of small, shallow-diving and large, deep-diving penguin species. The rockhopper penguin had a heart larger than expected for its body mass, and its heart weight/body weight was significantly greater than in the larger Adélie penguin. We found the rockhopper’s right […]