气候变化领域集成服务门户(CCPortal): New fossil and isotope evidence for the Pleistocene zoogeographic transition and hypothesized savanna corridor in peninsular Thailand

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DOI	10.1016/j.quascirev.2019.105861
	New fossil and isotope evidence for the Pleistocene zoogeographic transition and hypothesized savanna corridor in peninsular Thailand
	Suraprasit K.; Jongautchariyakul S.; Yamee C.; Pothichaiya C.; Bocherens H.
发表日期	2019
ISSN	0277-3791
卷号	221
英文摘要	Despite the explanation that the present-day biogeographic boundary between the Indochinese and Sundaic subregions at the Kra Isthmus, the narrowest part of Peninsular Thailand, in relation to differences in faunal and floral composition is almost conventionally valid for many groups of organisms, the distribution limits of modern and Pleistocene mammals in this region remain unclear. Moreover, environmental factors driving the past distribution patterns in a Southeast Asian mammal community and vegetation types contributing to the controversial hypothesis of an equatorial savanna corridor in the Thai-Malay Peninsula have rarely been demonstrated due to the scarcity of data. Since the discovery of a new Pleistocene fossil site, Yai Ruak Cave in Krabi Province, mammal fossils have been recovered from infilling sediments within the Permian karsts. On the basis of our first excavation, four mammal taxa: Hystrix cf. brachyura, Crocuta crocuta ultima, Rhinoceros sondaicus, and Rusa unicolor are taxonomically identified. A preliminary biochronological age ranging from the late Middle to early Late Pleistocene for the fauna based on the presence of C. c. ultima is proposed. The occurrence of C. c. ultima in this cave also represents the southernmost record of its known distribution, thus suggesting a non-concordant southern range limit of the Indochinese species at the Isthmus of Kra, but somewhere south of Krabi, during the Pleistocene. A bulk analysis of stable carbon isotopes investigated from tooth enamel of these mammals exhibits a variety of habitats ranging from pure C3 to C4 ecosystems, implying the existence of an open grassland landscape. The serial δ18O data collected along the tooth crown heights of R. sondaicus possibly reflect no or little seasonal variation with high annual precipitation due to a major influence of both Southwest and Northeast monsoons in the region, similar to the modern climate. Unlike today, more open vegetation/forest-grassland mosaic was however dominant in Peninsular Thailand at that time. The southward distribution range of the spotted hyaena was likely limited by the discontinuous north-south savanna corridor, latitudinally separated by a transequatorial rainforest belt, starting around the northern part of Sundaland. The ecological distinction between closed and open canopy habitats in the Thai-Malay Peninsula remarkably played a major role in confining the southward distribution of some Indochinese species and in obstructing the migration of grassland-inhabiting taxa across the Sundaic subregion during the Pleistocene glacials. © 2019 Elsevier Ltd
英文关键词	Biochronology; Indochinese-Sundaic boundary; Krabi; Large mammal fauna; Paleoclimatology; Pleistocene; Southeastern Asia; Spotted hyaena; Stable isotopes; Sundaland
语种	英语
scopus关键词	Caves; Ecosystems; Isotopes; Mammals; Tooth enamel; Vegetation; Biochronology; Indochinese-Sundaic boundary; Krabi; Large mammals; Paleoclimatology; Pleistocene; Southeastern Asia; Spotted hyaena; Stable isotopes; Sundaland; Population distribution; biochronology; C3 plant; C4 plant; community structure; dominance; fossil record; geographical distribution; grassland; identification method; isotopic analysis; mammal; paleoclimate; Pleistocene; savanna; seasonal variation; stable isotope; tooth; vegetation type; zoogeography; Isthmus of Kra; Krabi; Malay Peninsula; Southern Region; Thailand; Thailand; Cervus unicolor; Crocuta crocuta; Hyaena; Hystrix brachyurus; Mammalia; Rhinoceros sondaicus
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151790
作者单位	Morphology of Earth Surface and Advanced Geohazards in Southeast Asia Research Unit (MESA RU), Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand; Department of Geosciences, Biogeology, University of Tübingen, Hölderlinstraße 12, Tübingen, 72074, Germany; Department of Mineral Resources, Rama VI Road, Bangkok, 10400, Thailand; Senckenberg Research Centre for Human Evolution and Paleoenvironment (S-HEP), University of Tübingen, Sigwartstrasse 10, Tübingen, 72076, Germany
推荐引用方式 GB/T 7714	Suraprasit K.,Jongautchariyakul S.,Yamee C.,et al. New fossil and isotope evidence for the Pleistocene zoogeographic transition and hypothesized savanna corridor in peninsular Thailand[J],2019,221.
APA	Suraprasit K.,Jongautchariyakul S.,Yamee C.,Pothichaiya C.,&Bocherens H..(2019).New fossil and isotope evidence for the Pleistocene zoogeographic transition and hypothesized savanna corridor in peninsular Thailand.Quaternary Science Reviews,221.
MLA	Suraprasit K.,et al."New fossil and isotope evidence for the Pleistocene zoogeographic transition and hypothesized savanna corridor in peninsular Thailand".Quaternary Science Reviews 221(2019).