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Genetic Diversity and Environmental Preferences of Monothalamous Foraminifers Revealed through Clone Analysis of Environmental Small-Subunit Ribosomal DNA Sequences

Genetic Diversity and Environmental Preferences of Monothalamous Foraminifers Revealed through Clone Analysis of Environmental Small-Subunit Ribosomal DNA Sequences
Genetic Diversity and Environmental Preferences of Monothalamous Foraminifers Revealed through Clone Analysis of Environmental Small-Subunit Ribosomal DNA Sequences
Foraminifers form an important link between bacteria and macrobenthos in natural food webs and thereby play a major role in biogeochemical cycling. There have been few studies conducted to clarify these relationships, although the biomass of foraminifera, particularly the soft-shelled monothalamous taxa, is high in the deep seas. Molecular tools are now being used to study evolution and genetic diversity in widely separated oceanic environments. However, the relationship between genetic diversity and the ambient environment is not well understood. To test the idea that environmental conditions can affect genetic diversity, we conducted molecular phylogenetic analyses based on clone analysis of environmental DNA for benthic foraminifers and environmental measurements in sediments from various oceanic environments. Monothalamous foraminifers were found in dysoxic (<45 ?M), low-oxygen (<120 ?M), and well-oxygenated (>120 ?M) environments. The number of phylotypes was higher in the oxic environments of central Sagami Bay, Japan, and the east equatorial Pacific Ocean, than in the lower-oxygen areas of Sagami Bay. Phylotypes closely related to the genus Ovammina and some other saccamminids, as well as the calcareous genus Stainforthia, were preferentially found in lower dissolved-oxygen (DO) environments, while phylotypes of other saccamminids, Hippocrepinella, and an unidentified foraminiferal species, occurred at higher DO concentrations. Our analysis suggests that novel monothalamous phylotypes exist in habitats ranging from the sulfide-enriched environments of chemosynthetic ecosystems to those with high concentrations of DO as at the abyssal depths and in well-mixed bioturbated sediments.
0096-1191
3-13
Tsuchiya, M.
4a0d93d1-2f68-452b-9709-9584642f88a5
Gooday, A.J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Nomaki, H.
d8358e43-14a1-4b0a-a943-ed5773845364
Oguri, K.
6e58b55b-4bd7-4790-b32b-344a45dcc8df
Kitazato, H.
aeaa64e4-279a-4089-b0af-a733500f2e3b
Tsuchiya, M.
4a0d93d1-2f68-452b-9709-9584642f88a5
Gooday, A.J.
d9331d67-d518-4cfb-baed-9df3333b05b9
Nomaki, H.
d8358e43-14a1-4b0a-a943-ed5773845364
Oguri, K.
6e58b55b-4bd7-4790-b32b-344a45dcc8df
Kitazato, H.
aeaa64e4-279a-4089-b0af-a733500f2e3b

Tsuchiya, M., Gooday, A.J., Nomaki, H., Oguri, K. and Kitazato, H. (2013) Genetic Diversity and Environmental Preferences of Monothalamous Foraminifers Revealed through Clone Analysis of Environmental Small-Subunit Ribosomal DNA Sequences. The Journal of Foraminiferal Research, 43 (1), 3-13. (doi:10.2113/gsjfr.43.1.3).

Record type: Article

Abstract

Foraminifers form an important link between bacteria and macrobenthos in natural food webs and thereby play a major role in biogeochemical cycling. There have been few studies conducted to clarify these relationships, although the biomass of foraminifera, particularly the soft-shelled monothalamous taxa, is high in the deep seas. Molecular tools are now being used to study evolution and genetic diversity in widely separated oceanic environments. However, the relationship between genetic diversity and the ambient environment is not well understood. To test the idea that environmental conditions can affect genetic diversity, we conducted molecular phylogenetic analyses based on clone analysis of environmental DNA for benthic foraminifers and environmental measurements in sediments from various oceanic environments. Monothalamous foraminifers were found in dysoxic (<45 ?M), low-oxygen (<120 ?M), and well-oxygenated (>120 ?M) environments. The number of phylotypes was higher in the oxic environments of central Sagami Bay, Japan, and the east equatorial Pacific Ocean, than in the lower-oxygen areas of Sagami Bay. Phylotypes closely related to the genus Ovammina and some other saccamminids, as well as the calcareous genus Stainforthia, were preferentially found in lower dissolved-oxygen (DO) environments, while phylotypes of other saccamminids, Hippocrepinella, and an unidentified foraminiferal species, occurred at higher DO concentrations. Our analysis suggests that novel monothalamous phylotypes exist in habitats ranging from the sulfide-enriched environments of chemosynthetic ecosystems to those with high concentrations of DO as at the abyssal depths and in well-mixed bioturbated sediments.

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Published date: January 2013
Organisations: Marine Biogeochemistry

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Local EPrints ID: 348320
URI: http://eprints.soton.ac.uk/id/eprint/348320
ISSN: 0096-1191
PURE UUID: 3b1910dd-1052-413c-8b0f-84017907bc01

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Date deposited: 12 Feb 2013 10:31
Last modified: 14 Mar 2024 12:57

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Contributors

Author: M. Tsuchiya
Author: A.J. Gooday
Author: H. Nomaki
Author: K. Oguri
Author: H. Kitazato

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