近日,，中國(guó)科學(xué)院南京地質(zhì)古生物研究所黃冰副研究員等在國(guó)際學(xué)術(shù)期刊《三古》（Palaeogeography,，Palaeoclimatology，Palaeoecology）刊登了其最新的研究成果“Global palaeobiogeographical patterns in brachiopods from survival to recovery after the end-Ordovician mass extinction,，”,，文章中，研究者揭示了奧陶紀(jì)末大滅絕后殘存-復(fù)蘇早期全球腕足動(dòng)物古地理最新研究成果。
地史時(shí)期的生物大滅絕事件不僅使生態(tài)系統(tǒng)和生態(tài)結(jié)構(gòu)遭受重創(chuàng),，同時(shí)因其時(shí)空分布特征,，也會(huì)對(duì)全球古生物地理格局產(chǎn)生一定程度的影響。滅絕事件后的殘存期—復(fù)蘇早期作為從滅絕到輻射的中間環(huán)節(jié),，承載著非常重要的宏演化過(guò)程,。在全球框架下對(duì)該時(shí)期進(jìn)行古生物地理學(xué)研究，有助于進(jìn)一步探索大滅絕后宏演化的過(guò)程及其意義,。
該研究基于已發(fā)表的資料及掌握的最新數(shù)據(jù)的整理,，建立了全球腕足動(dòng)物志留紀(jì)初魯?shù)ぴ缙冢埓嫫冢┖汪數(shù)ね砥冢◤?fù)蘇早期）共計(jì)29個(gè)產(chǎn)地408個(gè)出現(xiàn)信息數(shù)據(jù)集。運(yùn)用聚類分析（CA）和非度量性多元標(biāo)度變換（NMDS）,，研究人員對(duì)奧陶紀(jì)末大滅絕后殘存期及復(fù)蘇早期腕足動(dòng)物進(jìn)行定量古生物地理研究,，發(fā)現(xiàn)了該時(shí)期全球腕足動(dòng)物具有沿緯度分帶傾向的古生物地理分布格局。對(duì)魯?shù)ぴ?、晚期腕足?dòng)物數(shù)據(jù)的頻率分析表明,，多數(shù)滅絕前的世界性分子在滅絕后的殘存期（魯?shù)ぴ缙冢﹥H在一處發(fā)現(xiàn)，表明其收縮了分布范圍以躲避災(zāi)難,。待魯?shù)ね砥诃h(huán)境好轉(zhuǎn),，腕足動(dòng)物多樣性增高，同時(shí)有更多的分子不再局限于一個(gè)產(chǎn)地或古板塊,，而擴(kuò)散到更多區(qū)域,，顯示出生物群面貌有所好轉(zhuǎn)的跡象，生物“復(fù)蘇期”開(kāi)始,。（生物谷Bioon.com）
doi:10.1016/j.palaeo.2012.01.009
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Globalpalaeobiogeographicalpatterns in brachiopods from survival to recoveryafter the end-Ordovicianmassextinction
Bing Huanga, , , Jiayu Ronga, L. Robin M. Cocksb
Extinction events usually disrupt palaeobiogeographicalpatterns, but there have been few detailed studies of the Early Silurian survival–recovery period after the Late Ordovicianmassextinction. This paper summarizes and revises published information on the recovery of Early and Late Rhuddanian brachiopod faunas. The global dataset consists of 137 occurrences, 72 genera, and 13 localities of Early Rhuddanian (survival interval), and 271 occurrences, 91 genera, and 26 localities of the Late Rhuddanian (early recovery interval). The data are analyzed using Cluster Analysis, Nonmetric Multidimensional Scaling, and Minimum Spanning Tree using Yule's Y coefficient and the Raup–Crick coefficient (probabilistic index of similarity). The results display palaeolatitudinal distribution patterns for brachiopods during their survival and recovery. Frequency analysis of the data indicates that cosmopolitan taxa before the massextinction decreased in their post-extinction distribution. The survivors were mostly confined to one palaeoplate or even one locality in the survival interval, but expanded progressively in the subsequent recovery period. multiple strategies to enhance its adaptation to high-temperature and high-humidity conditions.
