BILL MORPHOLOGY AND DIET OF A FILTER-FEEDING SEABIRD - THE BROAD-BILLED PRION PACHYPTILA-VITTATA AT SOUTH-ATLANTIC GOUGH ISLAND

被引:30
作者
KLAGES, NTW [1 ]
COOPER, J [1 ]
机构
[1] UNIV CAPE TOWN,PERCY FITZPATRICK INST AFRICAN ORNITHOL,RONDEBOSCH 7700,SOUTH AFRICA
关键词
D O I
10.1111/j.1469-7998.1992.tb04401.x
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
One hundred and fifty diet samples collected from broad-billed prions Pachyptila vittata at South Atlantic Gough Island and Tristan da Cunha over four years during the breeding season showed that they fed almost exclusively on copepods (0.7-4.1 mm in size), consistent with a bill morphology adapted for filter-feeding. Food is sieved from the surface of the ocean by means of palatal lamellae, of which there are 112-136 on either side, 0.16 mm apart. The filtration area of both rows of lamellae together amounted to 785 mm2 and the bill held 4.1 ml of water with a maximally extended mandibular pouch. Both sexes of broad-billed prions look outwardly alike but morphometric measurements proved that males are slightly larger.
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页码:385 / 396
页数:12
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