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Ecological and evolutionary consequences of benthic community stasis in the very deep sea (>1500 m)

Published online by Cambridge University Press:  08 April 2016

Martin A. Buzas
Affiliation:
Smithsonian Institution, NHB MRC-121, Washington, D.C. 20013-7012, U.S.A. E-mail: [email protected]
Lee-Ann C. Hayek
Affiliation:
Smithsonian Institution, NHB MRC-121, Washington, D.C. 20013-7012, U.S.A. E-mail: [email protected]
Stephen J. Culver
Affiliation:
Department of Geological Sciences, East Carolina University, Greenville, North Carolina 27858, U.S.A.
Bruce W. Hayward
Affiliation:
Geomarine Research, 49 Swainston Road, St. Johns, Auckland, New Zealand
Lisa E. Osterman
Affiliation:
U. S. Geological Survey, 600 Fourth Street South, St. Petersburg, Florida 33701, U.S.A.

Abstract

An enigma of deep-sea biodiversity research is that the abyss with its low productivity and densities appears to have a biodiversity similar to that of shallower depths. This conceptualization of similarity is based mainly on per-sample estimates (point diversity, within-habitat, or α-diversity). Here, we use a measure of between-sample within-community diversity (β1H) to examine benthic foraminiferal diversity between 333 stations within 49 communties from New Zealand, the South Atlantic, the Gulf of Mexico, the Norwegian Sea, and the Arctic. The communities are grouped into two depth categories: 200–1500 m and >1500 m. β1H diversity exhibits no evidence of regional differences. Instead, higher values at shallower depths are observed worldwide. At depths of >1500 m the average β1H is zero, indicating stasis or no biodiversity gradient. The difference in β1H-diversity explains why, despite species richness often being greater per sample at deeper depths, the total number of species is greater at shallower depths. The greater number of communities and higher rate of evolution resulting in shorter species durations at shallower depths is also consistent with higher β1H values.

Type
Articles
Copyright
Copyright © The Paleontological Society 

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