Feeding, fasting and foraging success during chick rearing in macaroni penguins
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چکیده
منابع مشابه
Corticosterone predicts foraging behavior and parental care in macaroni penguins.
Corticosterone has received considerable attention as the principal hormonal mediator of allostasis or physiological stress in wild animals. More recently, it has also been implicated in the regulation of parental care in breeding birds, particularly with respect to individual variation in foraging behavior and provisioning effort. There is also evidence that prolactin can work either inversely...
متن کاملEnergetics of diving in macaroni penguins.
Heart rate (fH), abdominal temperature (T(ab)) and diving depth were measured in thirteen free-ranging breeding female macaroni penguins. Measurement of these variables allowed estimation of the mass-specific rate of oxygen consumption (V(O(2))) while diving and investigation of the physiological adjustments that might facilitate the diving behaviour observed in this species. In common with oth...
متن کاملHabitat selection by foraging macaroni penguins correlates with hematocrit, an index of aerobic condition
Reproductive investment during the chick-rearing period is an important contributor to lifetime fitness. Key to chick-rearing is the success of parental foraging, as food deliveries affect chick growth and survival up until fledging. For seabirds, oceanographic conditions including factors such as sea surface temperature are known to influence foraging decisions, but few studies have examined t...
متن کاملLong-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 almost entirely on lipids as an energy source, bo...
متن کاملInfluence of oceanographic structures on foraging strategies: Macaroni penguins at Crozet Islands
BACKGROUND In the open ocean, eddies and associated structures (fronts, filaments) have strong influences on the foraging activities of top-predators through the enhancement and the distribution of marine productivity, zooplankton and fish communities. Investigating how central place foragers, such as penguins, find and use these physical structures is crucial to better understanding their at-s...
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ژورنال
عنوان ژورنال: Marine Ecology Progress Series
سال: 2007
ISSN: 0171-8630,1616-1599
DOI: 10.3354/meps07024