| Were Late Cretaceous extinctions of gastropods selective by generic longevity? |
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| 作者姓名： | Dmitry A.Ruban |
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| 作者单位： | Division of Mineralogy and Petrography,Geology and Geography Faculty,Southern Federal University |
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| 摘 要： | Many gastropod taxa went extinct during the Late Cretaceous.The stratigraphic ranges of 268 genera permit to establish the longevity of extinction victims for each stage of this epoch."Young" taxa (originated within 3 epochs before the extinction) prevailed among victims of the extinctions in all stages.The proportion of "old" taxa(originated before the Cretaceous) that went extinct was the highest in the Cenomanian,and it was the lowest in the Coniacian and the Maastrichtian.It appears that the end-Cretaceous mass extinction affected chiefly "young" taxa.However,the comparison with the earlier time intervals suggests that this pattern of selectivity by generic longevity was not specific for the noted catastrophe,but,in contrast,it was typical for the entire Late Cretaceous.The latest Cenomanian environmental perturbation(OAE2) caused a stronger extinction of "old" taxa,and thus,this biotic crisis was less selective by generic longevity.This hypothesis,however,is not proven by the statistical test.
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| 关 键 词： | 生物大灭绝 晚白垩世 动物类群 腹足类 长寿 通用 白垩纪末期 时间间隔 |
| 收稿时间： | 11 February 2012 |
http://www.sciencedirect.com/science/article/pii/S1674987112000576 |
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| Dmitry A.Ruban.http://www.sciencedirect.com/science/article/pii/S1674987112000576[J].Geoscience Frontiers,2013,4(1):87-93. |
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| Authors: | ,
Dmitry ARuban |
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| Institution: | P.O.Box 7333.Rostov-na-Donu, 344056, Russian Federation(for postal communication);Division of Mineralogy and Petrography, Geology and Geography Faculty, Southern Federal University, Zorge Street 40, Rostov-na-Donu, 344090, Russian Federation |
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| Abstract: | Many gastropod taxa went extinct during the Late Cretaceous. The stratigraphic ranges of 268 genera permit to establish the longevity of extinction victims for each stage of this epoch. “Young” taxa (originated within 3 epochs before the extinction) prevailed among victims of the extinctions in all stages. The proportion of “old” taxa (originated before the Cretaceous) that went extinct was the highest in the Cenomanian, and it was the lowest in the Coniacian and the Maastrichtian. It appears that the end-Cretaceous mass extinction affected chiefly “young” taxa. However, the comparison with the earlier time intervals suggests that this pattern of selectivity by generic longevity was not specific for the noted catastrophe, but, in contrast, it was typical for the entire Late Cretaceous. The latest Cenomanian environmental perturbation (OAE2) caused a stronger extinction of “old” taxa, and thus, this biotic crisis was less selective by generic longevity. This hypothesis, however, is not proven by the statistical test. |
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| Keywords: | Gastropods Extinction Longevity Selectivity Late Cretaceous |
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