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Brachiopod palaeobiogeography in the western Tethys during the Early Jurassic diversity maximum: introduction of a Pontic Province
Lethaia ( IF 1.5 ) Pub Date : 2019-06-24 , DOI: 10.1111/let.12337
Attila Vörös 1 , Gilles Escarguel 2
Affiliation  

The biogeography of Pliensbachian (Early Jurassic) brachiopods in western Tethys is investigated using complementary multivariate tools including metric and non‐metric ordination, additive cluster and bootstrapped spanning network analyses, as well as one‐way analysis of similarity and similarity percentage analysis. All analyses were conducted using the Dice and Simpson similarity indices for presence/absence data on occurrence datasets involving 24 assemblages homogenized at the species level, including (403 taxa) or excluding (210 taxa) species found in only one assemblage. The analyses present a highly consistent biogeographical picture involving three main clusters: the Euro‐Boreal, Mediterranean and Pontic biochores. The brachiopod species typical of the newly defined Pontic biochore are illustrated. The three assemblages from the Atlas area are interpreted as a fourth biochore, compositionally intermediate between those of the Euro‐Boreal and Mediterranean. The Mediterranean biochore can be further divided into an intra‐ and a peri‐Mediterranean group. These five, palaeogeographically well‐constrained biochores show moderate to high degrees of species endemicity, ranging from 20% (Atlas) to 58% (Euro‐Boreal). Based on available evidence, and after a reasonable cutback of the customary scale of ranks, the following biogeographical categories and names are suggested for the western Tethyan Pliensbachian brachiopod biochores: Euro‐Boreal Province, Mediterranean Province (including an intra‐Mediterranean and a peri‐Mediterranean Subprovince), Pontic Province and Atlas Subprovince. In addition, a still poorly documented brachiopod biochore occurs on the Gondwana margin as a possible precursor of the extensive Middle to Late Jurassic Ethiopian Province.

中文翻译:

侏罗纪早期物种多样性最高时期特提斯西部的腕足类古生物地理:庞蒂克省的介绍

使用互补的多元工具,包括公制和非公制排序,加性类集和自举跨越网络分析,以及相似性和相似性百分比分析的单向分析,研究了特提斯西部的普林斯巴赫(侏罗纪早期)腕足动物的生物地理学。使用Dice和Simpson相似性指数进行所有分析,以分析涉及24种在物种水平上均质化的组合的出现数据集的存在/不存在数据,包括仅在一个组合中发现的(403类群)或排除(210类群)种。分析显示了高度一致的生物地理图景,涉及三个主要类别:欧洲-北方,地中海和庞蒂克生物群落。图解说明了新定义的庞蒂生物群落典型的腕足动物。来自阿特拉斯(Atlas)地区的三种组合被解释为第四种生物群落,在成分上介于欧洲北方和地中海生物群落之间。地中海生物群落可进一步分为地中海内部群和地中海周围群。这五种古地理条件严格的生物种群显示中度到高度的物种特有度,范围从20%(Atlas)到58%(Euro-Boreal)。根据现有证据,并在合理缩减惯常等级后,建议对西部特提斯人Pliensbachian腕足生物群落以下生物地理类别和名称:欧洲北部省,地中海省(包括地中海内部和地中海沿岸)地中海省),蓬蒂克省和阿特拉斯省。此外,
更新日期:2019-06-24
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