Feeding ecology of the Dark-rumped Petrel in the Galapagos Islands
Article Abstract:
The feeding ecology of the Dark-rumped Petrel (Pterodroma phaeopygia) in the Galapagos Islands was studied by examining food regurgitated by petrel chicks. Daily changes in mass were monitored to determine food quantity and food delivery rate by parents. It was found out that the chicks' diet consisted mainly of cephalopods, fish, crustaceans and stomach oils. Feeding rates declined from beginning to end of the nestling period, but meal sizes remained the same. Foraging by parents is nocturnal, and many of the prey are mesopelagic species taken from the ocean surface.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
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A comparative analysis of the nutritional quality of mixed and exclusive fruit diets for yellow-vented bulbuls
Article Abstract:
The feeding of a mixed fruit diet to yellow-vented bulbuls did not improve bird maintenance in captivity as compared to a single fruit diet. The birds compensated for low protein levels in fruits by increasing daily fruit intake. Fruit selection was biased toward those with the lowest seeds to pulp load rather than than toward fruits with the highest nutritional quality. Body mass decreases were observed regardless of diet and were attributed to decreasing apparent metabolizable energy, mineral nutrition imbalances and interference with protein digestion.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
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Notes on food habits of the Black and White Owl
Article Abstract:
The diet of the Black and White Owl (Ciccaba nigrolineata) was studied through analysis of fecal pellets from a pair of birds. According to biomass, about 78% of the prey were mammals, about 15% were birds and about 4% were insects. Several bat species made up about 64% of total mammalian biomass in the diet, indicating that the owls are more skilled in various capture strategies for this prey than previously assumed.
Publication Name: The Condor
Subject: Biological sciences
ISSN: 0010-5422
Year: 1992
User Contributions:
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