Nota sobre nidificación de Petreles (Procellariiformes) en isla Ardley, Shetland del Sur
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Date
1986
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Abstract
Gran esfuerzo se ha concentrado en estudiar las colonias de pingüinos que nidifican en isla Ardley (Shetland del Sur), dejando un poco de lado otros grupos de aves marinas que son muy numerosas en el área. Este es el caso particular de los Procellariiformes. Cuatro especies de este Orden se reproducen en la isla (Macronectes giganteus, Daption capense, Oceanites oceanicus, y Fregatta tropica). De otras tres especies (Fulmarus glacialoides, Pagodroma nivea, y Pachyptila desolata), se tienen antecedentes que nidifican en islas adyacentes a las Shetland del Sur, pero no se ha comprobado que nidifiquen en Ardley. En el presente trabajo se entrega información reproductiva de las cuatro especies de Procellariiformes nidificantes en Ardley. Especial énfasis se le da a Oceanites oceanicus por ser la especie mas abundante. Se localizaron 71 nidos, los que fueron caracterizados y controlados durante 14 días.
Ardley Island, a small island off the Fildes Peninsula, King George Island, South Shetland Islands, was searched for nesting procellariiform seabirds from 23 January to 6 February 1986. We located seven nests of Daption capense, 13 nests of Macronectes giganteus, and 71 nests of Oceanites oceanicus. ln addition, Fregatta tropica almost certainly breeds on the island and a possible nest site was located. An estimated 600 pairs of O. oceanicus nest on Ardley Island, a major breeding colony on the Fildes Peninsula. The variety of crevices occupied and the distribution of nests sites suggest that the breeding population of O. oceanicus may be limited by available snow-free nest sites. Numbers of breeding D. capense and M. giganteus are not limited by nest sites and appear more susceptible to human disturbance than O. oceanicus, particularly during the early phases of the breeding season. Three other species of procellariiforms (Fulmarus glacialoides, Pagodroma nivea, Pachyptila desolata) are known to nest either on the South Shetland Islands or adjacent areas of the Antarctic Peninsula, but apparently do not nest on Ardley Island.
Ardley Island, a small island off the Fildes Peninsula, King George Island, South Shetland Islands, was searched for nesting procellariiform seabirds from 23 January to 6 February 1986. We located seven nests of Daption capense, 13 nests of Macronectes giganteus, and 71 nests of Oceanites oceanicus. ln addition, Fregatta tropica almost certainly breeds on the island and a possible nest site was located. An estimated 600 pairs of O. oceanicus nest on Ardley Island, a major breeding colony on the Fildes Peninsula. The variety of crevices occupied and the distribution of nests sites suggest that the breeding population of O. oceanicus may be limited by available snow-free nest sites. Numbers of breeding D. capense and M. giganteus are not limited by nest sites and appear more susceptible to human disturbance than O. oceanicus, particularly during the early phases of the breeding season. Three other species of procellariiforms (Fulmarus glacialoides, Pagodroma nivea, Pachyptila desolata) are known to nest either on the South Shetland Islands or adjacent areas of the Antarctic Peninsula, but apparently do not nest on Ardley Island.
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Keywords
Procellariiformes, Golondrina de mar, Oceanites oceanicus
Citation
Serie Científica, nº 34, pp. 67-72, 1986