Parkinson's petrel distribution and foraging ecology in the Eastern Pacific:aspects of an exclusive feeding relationship with dolphins

Article Abstract:

Parkinson's petrels in the eastern tropical Pacific ranged from southern Mexico to northern Peru and seaward through the Galapagos to 110 degrees west longitude. This species has a consistent association with two rare dolphins, the melon-headed whale and the false killer whale. Foraging behavior was primarily association with dolphin herds, followed by ship following then scavenging of dead prey. They are thought to feed by diving under the surface to retreive scraps of large prey torn apart by the dolphins feeding below the surface. Most of the petrels observed had diurnal foraging patterns.

Animal populations, Dolphins, Dolphins (Mammals), Pacific Coast (South America)

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Field energy expenditures of the southern giant-petrel

Article Abstract:

Energy expenditure rates for southern giant-petrels were calculated using the doubly labeled water method. Foraging metabolic rates were 6.3 times that of the standard metabolic rate (SMR), much higher than those for albatrosses of similar size. The integrated field metabolic rate of 4,330 kJ/day was 4.6 times SMR and was the highest evermeasured in any bird. As compared to albatrosses, petrels spend more time in flapping flight, have higher wing loading and feed their chicks more frequently. These may account for the higher energy expenditure.

Energy metabolism, Animal anatomy

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Wing ecomorphology of seabirds from Johnston Atoll

Article Abstract:

A new study examines the wing morphology of nine species of seabird in the tropical Pacific to investigate the theory that wing morphology reflects ecological differences in searching for and catching prey. It is shown that foraging differences among species correlated with predicted differences in wing morphology.

Behavior, Pacific Ocean, Sea birds, Bird flight, Morphology (Animals), Animal morphology, Seabirds, Johnston Atoll

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