Based on a comprehensive literature survey, we determined the sources of the terrestrial vertebrate species on Christmas Island, asking where they originated relative to Wallace’s Line (the southern end of the divide lies 1100 km to the east, where the Lombok Strait adjoins the eastern Indian Ocean). The two bats, Pipistrellus murrayi and Pteropus natalis, are from the west. Concerning the endemic and ‘resident’ bird species, one is from the west (Collocalia natalis), four are from the east (Accipiter fasciatus, Egretta novaehollandiae, Falco cenchroides and Ninox natalis) and the other 15 are ambiguous or indeterminate. Most of the land-locked species are also from the east: rodents Rattus macleari and Rattus nativitatis, and squamates Cryptoblepharus egeriae, Emoia nativitatis and Lepidodactylus listeria. Additionally, two have westerly origins (Crocidura trichura and Cyrtodactylus sadleiri), one is ambiguous (Emoia atrocostata) and another is unknown (Ramphotyphlops exocoeti). West-directed surface currents that flow across the eastern Indian Ocean towards Christmas Island would have facilitated most of the land-animal colonizations. We therefore suggest that Wallace’s Line be redrawn such that the landmass is placed on the Australasian side of this fundamental biogeographical boundary.

中文翻译：

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根据印度洋东部圣诞岛动物区系重绘华莱士之线

根据一项全面的文献调查，我们确定了圣诞节岛上的陆生脊椎动物物种的来源，询问它们相对于华莱士之线的起源（鸿沟的南端位于东部1100公里，龙目岛海峡与东印度群岛毗邻海洋）。两只蝙蝠Pipistrellus murrayi和Pteropus natalis都来自西方。关于特有和“常住”鸟类，一种来自西部（Colllocalia natalis），四种来自东部（Accipiter fasciatus，Egretta novaehollandiae，Falco cenchroides和Ninox natalis）），而其他15个则模棱两可或不确定。大多数内陆物种也来自东部：啮齿动物Rattus macleari和Rattus nativitatis，以及鳞茎Cryptoblepharus egeriae，Emoia nativitatis和Lepidodactylus listeria。此外，有两个起源于西风（Crocidura trichura和Cyrtodactylus sadleiri），一个是模棱两可的（Emoia atrocostata），另一个是未知的（Ramphotyphlops exocoeti））。向西流过印度洋东部流向圣诞岛的地表水流将促进大多数陆地动物的定居。因此，我们建议重新绘制华莱士线，以使陆地位于该基本生物地理边界的澳大利亚一侧。