DOI: 10.1016/j.palaeo.2017.08.033
论文题名: Relative abundances and palaeoecology of four suid genera in the Turkana Basin, Kenya, during the late Miocene to Pleistocene
作者: Rannikko J. ; Žliobaite I. ; Fortelius M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: C4
; Ecological niche
; Kolpochoerus
; Metridiochoerus
; Notochoerus
; Nyanzachoerus
英文摘要: Most suids (Mammalia: Suidae, pigs) worldwide are omnivores living in closed environments, but the African warthog (Phacochoerus) has special adaptations for grazing in open environments. Similar specializations have been recorded from Plio-Pleistocene African suids. Four genera, Nyanzachoerus, Notochoerus, Kolpochoerus, and Metridiochoerus, have been discovered in late Miocene to middle Pleistocene locations around the Turkana Basin.We analyse the relative abundances of these four suid genera compared to other mammals, from approximately 8-0.7. Ma. The dataset includes most of the mammal specimens collected from locations around the Kenyan side of the Turkana Basin. Species of genus Nyanzachoerus were dominant before 4. Ma, but their relative abundance decreases through time thereafter. At the same time, Notochoerus increases in relative abundance, followed by Kolpochoerus, and finally Metridiochoerus. Their peak relative abundances do not overlap: Notochoerus peaks at 3.44-2.53. Ma, Kolpochoerus at 2.53-1.87. Ma, and Metridiochoerus at 1.38-0.7. Ma.We interpret the palaeoecology of these suids based on their relative abundances over time and on published isotope and pollen data. We find that Nyanzachoerus was replaced by its abrasive-diet-specialized successor Notochoerus, possibly in response to a rapid decrease in forest cover. Notochoerus adapted at first to the expanding wood- and grasslands, and then to more arid shrublands. After a period of severe aridity around 2.7-2.5. Ma, more variable environments allowed Kolpochoerus and Metridiochoerus to disperse, while Notochoerus disappeared, perhaps having lost its competitive edge. Further changes in the environment encouraged the expansion of grasslands over shrublands, favouring Metridiochoerus. Kolpochoerus persisted in the more closed environments near water sources. © 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68124
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geosciences and Geography, University of Helsinki, 00560 Helsinki, Finland; Department of Computer Science, University of Helsinki, 00560 Helsinki, Finland; Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, NO-0316 Oslo, Norway
Recommended Citation:
Rannikko J.,Žliobaite I.,Fortelius M.. Relative abundances and palaeoecology of four suid genera in the Turkana Basin, Kenya, during the late Miocene to Pleistocene[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01