Maximum dive depths of the Peruvian diving-petrel

Article Abstract:

Capillary-tub gauges have been successfully used to determine the maximum dive depth of some species of sea birds, although they can only record the deepest dives, which do not reflect the bird's normal foraging depths. A new study uses maximum depth gauges to determine the maximum diving depths of breeding Peruvian diving-petrels. The mean maximum diving depth is calculated to be around 31.6 mt, with the deepest dive being 83.1 mt. It is shown that diving depth values of Peruvian diving-petrels, related to body size in other diving birds, are 81% greater than predictions.

Sea birds, Seabirds

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Attraction of the endangered Dark-rumped Petrel to recorded vocalizations in the Galapagos Islands

Article Abstract:

The results of a study in the Galapagos Islands show that Dark-rumped Petrels (Pterodroma Phaeopygia) can be attracted by playbacks of their vocalizations. Mean capture rates in mist nets were higher with playbacks of vocalizations. It was also found out that certain vocalizations are interpreted by birds as indicators of the quality of nesting habitat. The findings can be useful in attracting the Dark-rumped Petrel to suitable habitats and thereby help to increase the population of the endangered seabird.

Birdsongs

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Reproductive biology and vocalizations of the horned guan Oreophasis derbianus in Mexico

Article Abstract:

A research study focused on the reproductive biology and vocalizations of the horned guans in Chiapas, Mexico's El Triunfo Biosphere Reserve. The horned guan, whose nests and eggs are described for the first time, has a polygynous mating system in which the males produce a minimum of five types of calls while the females make from seven to eight gutteral vocalizations. Several methods for conserving the Oreophasis derbianus and its habitat are discussed.

Analysis, Mexico, Natural history, Ornithological research, Birds, Animal reproduction

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