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首页> 外文学位 >Changes in Neogene Caribbean benthic community structure after closure of the Central America Seaway.
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Changes in Neogene Caribbean benthic community structure after closure of the Central America Seaway.

机译：中美洲航道关闭后新近纪加勒比海底栖动物群落结构的变化。

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摘要

The role that environmental forcing plays in driving macroevolution is a fundamental question in paleontology. To rigorously test the effect of environmental change on biology, independent paleoecological and paleoenvironmental data are necessary. Cases where these types of quantitative data have been generated are rare; consequently few paleobiologic studies have the rigor to address such questions. The work presented here uses quantitative ecological data on Caribbean bivalve assemblages dating back to 11 Ma to address the question of cause and effect with regard to environmental change, ecologic change, and biologic interactions.;Changes in the functional ecology of bivalve assemblages through time are linked to changes in Caribbean habitats. As coral reefs emerged as important habitats epifaunal bivalves became relatively more abundant constitutents of the bivalve assemblage. Likewise, as seagrass meadows became more common in the Caribbean, in conjunction with the emergence of coral reefs, bivalve diets diversified. Habitat also influenced biologic interactions. Predation intensity on bivalves increased in conjunction with the diversification of Caribbean habitats. Finally, throughout the Pliocene drilling among bivalve families remained constant, although drilling varies dramatically among bivalve taxa and is primarily related to life mode and habit. Thus, changes in the relative abundance of bivalves can also explain the observed differences in drilling intensity through time. As a whole, this research highlights the importance of environment in structuring communities and driving biological interactions. It also illustrates how the consequences of environmental perturbations may depend on cascades of ecological changes, with outcomes that are difficult to predict.
机译：环境强迫在推动宏观进化中的作用是古生物学中的一个基本问题。要严格测试环境变化对生物学的影响，需要独立的古生态学和古环境数据。生成这些类型的定量数据的情况很少见；因此，很少有古生物学研究能够解决这些问题。这里介绍的工作使用了可追溯到11 Ma的加勒比双壳类动物种群的定量生态数据，以解决环境变化，生态变化和生物相互作用方面的因果关系问题;双壳类动物的功能生态随着时间的变化是与加勒比地区栖息地的变化有关。随着珊瑚礁作为重要栖息地的出现，表足双壳类成为双壳类组合的相对更丰富的组成部分。同样，随着海草草甸在加勒比地区变得越来越普遍，再加上珊瑚礁的出现，双壳类动物的饮食变得多样化。生境也影响了生物相互作用。随着加勒比海栖息地的多样化，双壳类动物的捕捞强度也增加了。最后，尽管在双壳类群中钻探差异很大，并且主要与生活方式和习性有关，但在整个上新世，双壳类的钻探一直保持不变。因此，双壳类动物相对丰度的变化也可以解释所观察到的钻井强度随时间的差异。总体而言，这项研究突出了环境在构建社区和推动生物相互作用方面的重要性。它还说明了环境扰动的后果可能如何取决于生态变化的级联，其结果难以预测。

著录项

  • 作者

    Leonard-Pingel, Jill Suzanne.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Paleontology.;Paleoecology.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 130 p.
  • 总页数 130
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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