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Bird extinctions and fossil bones from Mangere Island, Chatham Islands | Notornis and Birds New Zealand

机译：查塔姆群岛曼格里岛的鸟类灭绝和化石骨骼|诺托尼斯和鸟类新西兰

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Fossil bones and earlier observations indicate that up to 22 species of bird have become extinct on Mangere Island. The extinctions appear to have been primarily a result of predation by cats, but human hunting and bush clearance are likely to account for the disappearance of some species. A crested penguin Eudyptes ?n.sp., two species of Pterodroma petrel, a shelduck Tadorna ?n.sp., Dieffenbach's Rail Gallirallus dieffenbachii, and a kaka Nestor ?n.sp. are present in fossil deposits on Mangere Island, but have not been reported from the island before. The relative proportion of remains in the deposits suggest that Blue Penguins Eudyptula minor, Broad-billed Prions Pachyptila vittata and Sooty Shearwaters Puffinus griseus have become more common on the island. Any such increases on Mangere Island, could have been a response of a few species to the large decrease in numbers and diversity that has affected seabirds as a whole at the Chathams. Some seabird species may have been able to increase because of reduced competition for food.
机译：化石的骨骼和早期的观察表明，曼格勒岛上多达22种鸟类灭绝。灭绝似乎主要是由于猫的捕食造成的，但是人类的狩猎和灌木丛的清除很可能是某些物种消失的原因。凤头企鹅Eudyptes？n.sp。，两种翼手龙海燕，谢尔德Tadorna？n.sp。，迪芬巴赫​​的Rail Gallirallus dieffenbachii和kaka Nestor？n.sp.。现存于Mangere岛上的化石矿床中，但之前从未有过报道。沉积物中残留物的相对比例表明，小岛上的蓝企鹅Eudyptula，宽嘴Pr病毒Pachyptila vittata和Sooty Shearwaters Puffinus griseus变得更加普遍。 Mangere岛上的任何此类增加，可能是少数物种对Chathams整体上影响海鸟的数量和多样性大幅度减少的反应。由于减少了对食物的竞争，一些海鸟物种可能已经能够增加。

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