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Marine Ecology Progress Series

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MEPS 383:225-237 (2009)  -  DOI:

Effects of oceanographic retention on decapod and gastropod community diversity on seamounts

P. E. Brewin1,4,*, K. I. Stocks2, D. B. Haidvogel3, C. Condit1, A. Gupta2

1Center for Research in Biological Systems, and 2San Diego Supercomputer Center, University of California San Diego, 9500 Gilman Dr., MC 0505, La Jolla, California 92093-0505, USA
3Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Rd., New Brunswick, New Jersey 08901-8521, USA
4Present address: Flat 1, 3 Grove Park, London, SE5 8LT, UK

ABSTRACT: Using global physical and biological datasets, we tested oceanographic retention (factoring out effects of seamount depth and age) as one possible mechanism structuring seamount benthic decapod and gastropod communities. We first determined the relative oceanographic retentive potential (such as from Taylor caps or columns) for individual seamounts based on steady-state theory. This was then separately compared to decapod and gastropod taxonomic distinctness, our metric for the community’s response to oceanographic retention. Taxonomic distinctness is a metric based on phylogenetic relatedness between species. Therefore, between-seamount variability in taxonomic distinctness may reflect the effects of long-term oceanographic retention at the seamount spatial scale. Taxonomic distinctness and retention potential varied between seamounts, but retention did not explain variation in taxonomic distinctness. Among decapod communities, variation in taxonomic distinctness was partly explained by seamount summit depth. With respect to previously suggested causal relationships between seamount retention and biogeographic patterns (divergent seamount communities, high rates of endemism, and inferred speciation at the scale of the seamount), we concluded that seamount-scaled oceanographic retention is weak compared to other ecological drivers of community diversity on seamounts. Alternative processes (such as those related to depth), or alternative spatial scales (within each seamount or between seamount groups and chains) must be considered to explain divergent patterns among seamounts for these taxa.

KEY WORDS: Seamount · Taxonomic distinctness · Isolation · Gastropod · Decapod · Taylor cap · Taylor column · Retention · Data integration

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Cite this article as: Brewin PE, Stocks KI, Haidvogel DB, Condit C, Gupta A (2009) Effects of oceanographic retention on decapod and gastropod community diversity on seamounts. Mar Ecol Prog Ser 383:225-237.

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