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Temporal latitudinal-gradient dynamics and tropical instability of deep-sea species diversity

Proceedings of the National Academy of Sciences of the United States of America

By:
, , ,
DOI: 10.1073/pnas.0910935106

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Abstract

A benthic microfaunal record from the equatorial Atlantic Ocean over the past four glacial-interglacial cycles was investigated to understand temporal dynamics of deep-sea latitudinal species diversity gradients (LSDGs). The results demonstrate unexpected instability and high amplitude fluctuations of species diversity in the tropical deep ocean that are correlated with orbital-scale oscillations in global climate: Species diversity is low during glacial and high during interglacial periods. This implies that climate severely influences deep-sea diversity, even at tropical latitudes, and that deep-sea LSDGs, while generally present for the last 36 million years, were weakened or absent during glacial periods. Temporally dynamic LSDGs and unstable tropical diversity require reconsideration of current ecological hypotheses about the generation and maintenance of biodiversity as they apply to the deep sea, and underscore the potential vulnerability and conservation importance of tropical deep-sea ecosystems.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Temporal latitudinal-gradient dynamics and tropical instability of deep-sea species diversity
Series title:
Proceedings of the National Academy of Sciences of the United States of America
DOI:
10.1073/pnas.0910935106
Volume
106
Issue:
51
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Proceedings of the National Academy of Sciences of the United States of America
First page:
21717
Last page:
21720
Number of Pages:
4