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首页> 外文期刊>Ostrich >An assessment of the impact of predation by Cape fur seals Arctocephalus pusillus pusillus on seabirds at Dyer Island, South Africa
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An assessment of the impact of predation by Cape fur seals Arctocephalus pusillus pusillus on seabirds at Dyer Island, South Africa

机译：在南非代尔岛，海角毛皮海豹Arctocephalus pusillus pusillus对海鸟的捕食影响评估

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At Dyer Island, South Africa, observations of predation of seabirds by Cape Fur Seals Arctocephalus pusillus pusillus were made during 2004 and 2006/07. It was estimated that seals killed about 7% of adult African Penguins Spheniscus demersus annually. This may have contributed to the penguin colony not increasing in spite of food becoming more available in its vicinity during an eastward shift of epipelagic fish resources off South Africa at the start of the twenty-first century. Adult penguins were most susceptible to mortality in the breeding season as they returned to feed chicks in the evening. Seals also killed substantial numbers (3-9%) of Cape Cormorant Phalacrocorax capensis fledglings as they left the island, mostly in the morning. The losses of Cape Cormorant fledglings accounted for about 95% of the overall mortality of seabirds attributable to seals. Mortality inflicted by seals on adults of four species of cormorant was negligible and no predation by seals on gulls and terns was observed.
机译：在南非的代尔岛，2004年和2006/07年间观察到了海角海狗北极头Arc的捕食海鸟的行为。据估计，海豹每年会杀死约7％的成年非洲企鹅Spheniscus demersus。尽管二十世纪初表皮鱼类资源从南非向东转移的过程中，尽管附近有更多的食物，但企鹅种群却没有增加。成年企鹅在繁殖季节最容易死亡，因为它们在晚上返回喂小鸡。当海豹离开岛时，大部分时间是在早上，海豹也杀死了相当数量（3-9％）的Cape角海角雏鸟。 Cor角幼鸟的损失约占海豹海鸟总死亡率的95％。海豹对四种of的成年人造成的死亡率微不足道，没有观察到海鸥和燕鸥对海豹的捕食。

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