Biogeography of terrestrial and freshwater vertebrates from the late Cretaceous (Campanian) Western Interior of North America
Biogeography of terrestrial and freshwater vertebrates from the late Cretaceous (Campanian) Western Interior of North America
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DOI：
10.1016/j.palaeo.2010.03.008
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发表时间：
2010-05-15
影响因子：
3
通讯作者：
Getty, M. A.
中科院分区：
文献类型：
--
作者：
Gates, T. A.;Sampson, S. D.;Getty, M. A.
北美西部内陆盆地（WIB）晚白垩世（晚坎帕尼亚期）脊椎动物区系的地理学研究表明，存在区系和植物区系的地域性，其特征是明显的北方和南方生物群系。“然而，“地方性假说”受到质疑，主要是基于这样一种论点，即所调查的动物群是从一系列穿时的、时间海侵的沉积物中恢复的，因此是不相关的。在晚坎帕尼亚时代的几个含化石单位中进行的大量工作，包括恐龙公园、朱迪思河、两个梅迪辛、凯帕罗维茨、果地/克特兰和阿古贾地层，极大地增加了对WIB脊椎动物群及其年代地层关系的了解。在这里，更新和大大扩展的动物群和年代地层数据集进行广泛的地理分析，这六个陆地含盐地层内的WIB的北美。利用相似性分析、Q型聚类分析、特有性简约分析和对应分析等统计方法，对该构造及其组成动物群进行了定量的地理比较，结果表明，该构造的动物群在北方和南方具有明显的差异，并以动物群的纬度梯度为界面。然而，这些动物群之间的界面的性质仍然不清楚，可能性包括：1）两个或两个以上的离散省份由一个（或多个）动物群混合区分开;和2）连续的纬度梯度或dine，没有离散的地方性区。缺乏证据的任何自然地理的障碍，南北扩散，气候变化内的WIB被认为是最有可能的解释，为总体pneumeographic模式观察晚坎帕尼亚脊椎动物类群。(C)2010爱思唯尔有限公司版权所有。
Previous biogeographic studies of late Cretaceous (late Campanian) vertebrate faunas in the Western Interior Basin (WIB) of North America have suggested the presence of faunal and floral provincialism, characterized by distinct northern and southern 'biomes.' However, the "provincialism hypothesis" has been questioned based largely on the contention that the investigated faunas were recovered from a series of diachronous, time-transgressive deposits, and are therefore non-correlative.Extensive work in several fossiliferous units of late Campanian age, including the Dinosaur Park, Judith River, Two Medicine, Kaiparowits, Fruitland/Kirtland, and Aguja formations, has greatly increased understanding of WIB vertebrate faunas and their chronostratigraphic relationships. Here updated and greatly expanded faunal and chronostratigraphic datasets are utilized to undertake an extensive biogeographic analysis of these six terrestrial fossiliferous formations within the WIB of North America. Quantitative biogeographic comparisons of the formations and their constituent faunas are conducted using four statistical methods: Analysis of Similarity, Q-mode cluster analysis, Parsimony Analysis of Endemicity, and Correspondence Analysis.The results of this study provide strong support for highly divergent faunas in northern and southern regions of the WIB, with a latitudinal faunal gradient as an interface. Yet the nature of the interface between these faunas remains unclear, with possibilities including: 1) two or more discrete provinces separated by a zone (or zones) of faunal mixing; and 2) a continuous latitudinal gradient or dine, with no discrete zones of endemism. Lacking evidence of any physiographic barrier to north-south dispersal, climatic variation within the WIB is regarded as the most likely explanation for the overarching biogeographic patterns observed for late Campanian vertebrate taxa. (C) 2010 Elsevier B.V. All rights reserved.