...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Last global extinction in the deep sea during the mid-Pleistocene climate transition
【24h】

Last global extinction in the deep sea during the mid-Pleistocene climate transition

机译：中更新世气候过渡期间深海的最后一次全球灭绝

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Twenty percent (19 genera, 95 species) of cosmopolitan, deep-sea (500-4000 m), benthic foraminiferal species became extinct during the late Pliocene-Middle Pleistocene (3-0.12 Ma), with the peak of extinctions (76 species) occurring during the mid-Pleistocene Climate Transition (MPT, 1.2-0.55 Ma). One whole family (Stilostomellidae, 30 species) was wiped out, and a second (Pleurostomellidae, 29 species) was decimated with just one species possibly surviving through to the present. Our studies at 21 deep-sea core sites show widespread pulsed declines in abundance and diversity of the extinction group species during more extreme glacials, with partial interglacial recoveries. These declines started in the late Pliocene in southern sourced deep water masses (Antarctic Bottom Water, Circumpolar Deep Water) and extending into intermediate waters (Antarctic Intermediate Water, North Atlantic Deep Water) in the MPT, with the youngest declines in sites farthest downstream from high-latitude source areas for intermediate waters. We infer that the unusual apertural types that were targeted by this extinction period were adaptations for a specific kind of food source and that it was probably the demise of this microbial food that resulted in the foraminiferal extinctions. We hypothesize that it may have been increased cold and oxygenation of the southern sourced deep water masses that impacted on this deep water microbial food source during major late Pliocene and Early Pleistocene glacials when Antarctic ice was substantially expanded. The food source in intermediate water was not impacted until major glacials in the MPT when there were significant expansion of polar sea ice in both hemispheres and major changes in the source areas, temperature, and oxygenation of global intermediate waters.
机译：在上新世-中更新世（3-0.12 Ma）晚期，有20％（19属95种）世界性深海（500-4000 m）底栖有孔虫物种灭绝，灭绝高峰（76种）发生在更新世中期（MPT，1.2-0.55 Ma）期间。消灭了一个完整的科（虎耳草科，30种），而第二个科（P毛虫科，29种）被灭绝，只有一种可能存活至今。我们在21个深海核心站点的研究表明，在更极端的冰川时期，灭绝类物种的丰度和多样性出现了广泛的脉冲式下降，部分冰川间恢复了。这些下降始于上新世晚期的南部源深水团块（南极底水，极地深水），并延伸到MPT的中间水域（南极中层水，北大西洋深水），而距下游最远的站点下降幅度最小。中等水域的高纬度源区。我们推断，此灭绝期所针对的异常孔眼类型是对特定种类食物的适应，并且可能是这种微生物食物的灭绝导致了有孔虫的灭绝。我们假设，南极冰层大面积扩张时，主要晚新世和早更新世冰川期间，南部源深水团的寒冷和充氧作用可能会影响这种深水微生物食物来源。直到MPT中的主要冰川出现时，中间水域的食物来源才受到影响，当时两半球中的极地海冰都显着膨胀，并且全球中间水域的来源区域，温度和含氧量发生了重大变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号