Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids
Thesis (Ph. D.)--Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2005. Includes bibliographical references. The overarching goal of this thesis was to investigate marine benthic invertebrate phylogeneti...
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ftmit:oai:dspace.mit.edu:1721.1/39191 2023-06-11T04:15:25+02:00 Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids Jennings, Robert M. (Robert Michael) Lauren S. Mullineaux. Woods Hole Oceanographic Institution. Joint Program in Biological Oceanography. Massachusetts Institute of Technology. Dept. of Biology. 2005 151 p. application/pdf http://hdl.handle.net/1721.1/39191 http://dspace.mit.edu/handle/1721.1/39191 eng eng Massachusetts Institute of Technology http://dspace.mit.edu/handle/1721.1/39191 http://hdl.handle.net/1721.1/39191 65197302 M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/39191 http://dspace.mit.edu/handle/1721.1/7582 Joint Program in Biological Oceanography Biology Woods Hole Oceanographic Institution Benthic animals Larvae Annelida Animal population genetics Thesis 2005 ftmit 2023-05-29T08:21:06Z Thesis (Ph. D.)--Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2005. Includes bibliographical references. The overarching goal of this thesis was to investigate marine benthic invertebrate phylogenetics and population genetics, focused on the phylum Annelida. Recent expansions of molecular methods and the increasing diversity of available markers have allowed more complex and fine-scale questions to be asked at a variety of taxonomic levels. At the phylogenetic level, whole mitochondrial genome sequencing of two polychaetes (the deep-sea tubeworm Riftia pachyptila and the intertidal bamboo worm Clymenella torquata) supports the placement of leeches and oligochaetes within the polychaete radiation, in keeping with molecular evidence and morphological reinvestigations. This re-interpretation, first proposed by others, synonomizes "Annelida" and "Polychaeta", and lends further support to the inclusion of echiurids, siboglinids (previously called vestimentiferans) within annelids, and sipunculans as close allies. The complete mt-genome of C. torquata was then rapidly screened to obtain markers useful in short timescale population genetics. (cont.) Two quickly evolving mitochondrial markers were sequenced from ten populations of C. torquata from the Bay of Fundy to New Jersey to investigate previous hypotheses that the Cape Cod, MA peninsula is a barrier to gene flow in the northwest Atlantic. A barrier to gene flow was found, but displaced south of Cape Cod, between Rhode Island and Long Island, NY. Imposed upon this pattern was a gradient in genetic diversity presumably due to previous glaciation, with northern populations exhibiting greatly reduced diversity relative to southern sites. These trends in C. torquata, combined with other recent short time scale population genetic research, highlight the lack of population genetics models relevant to marine benthic invertebrates. To this end, I constructed a model ... Thesis Northwest Atlantic DSpace@MIT (Massachusetts Institute of Technology) Long Island |
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Open Polar |
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DSpace@MIT (Massachusetts Institute of Technology) |
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ftmit |
language |
English |
topic |
Joint Program in Biological Oceanography Biology Woods Hole Oceanographic Institution Benthic animals Larvae Annelida Animal population genetics |
spellingShingle |
Joint Program in Biological Oceanography Biology Woods Hole Oceanographic Institution Benthic animals Larvae Annelida Animal population genetics Jennings, Robert M. (Robert Michael) Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids |
topic_facet |
Joint Program in Biological Oceanography Biology Woods Hole Oceanographic Institution Benthic animals Larvae Annelida Animal population genetics |
description |
Thesis (Ph. D.)--Joint Program in Biological Oceanography (Massachusetts Institute of Technology, Dept. of Biology; and the Woods Hole Oceanographic Institution), 2005. Includes bibliographical references. The overarching goal of this thesis was to investigate marine benthic invertebrate phylogenetics and population genetics, focused on the phylum Annelida. Recent expansions of molecular methods and the increasing diversity of available markers have allowed more complex and fine-scale questions to be asked at a variety of taxonomic levels. At the phylogenetic level, whole mitochondrial genome sequencing of two polychaetes (the deep-sea tubeworm Riftia pachyptila and the intertidal bamboo worm Clymenella torquata) supports the placement of leeches and oligochaetes within the polychaete radiation, in keeping with molecular evidence and morphological reinvestigations. This re-interpretation, first proposed by others, synonomizes "Annelida" and "Polychaeta", and lends further support to the inclusion of echiurids, siboglinids (previously called vestimentiferans) within annelids, and sipunculans as close allies. The complete mt-genome of C. torquata was then rapidly screened to obtain markers useful in short timescale population genetics. (cont.) Two quickly evolving mitochondrial markers were sequenced from ten populations of C. torquata from the Bay of Fundy to New Jersey to investigate previous hypotheses that the Cape Cod, MA peninsula is a barrier to gene flow in the northwest Atlantic. A barrier to gene flow was found, but displaced south of Cape Cod, between Rhode Island and Long Island, NY. Imposed upon this pattern was a gradient in genetic diversity presumably due to previous glaciation, with northern populations exhibiting greatly reduced diversity relative to southern sites. These trends in C. torquata, combined with other recent short time scale population genetic research, highlight the lack of population genetics models relevant to marine benthic invertebrates. To this end, I constructed a model ... |
author2 |
Lauren S. Mullineaux. Woods Hole Oceanographic Institution. Joint Program in Biological Oceanography. Massachusetts Institute of Technology. Dept. of Biology. |
format |
Thesis |
author |
Jennings, Robert M. (Robert Michael) |
author_facet |
Jennings, Robert M. (Robert Michael) |
author_sort |
Jennings, Robert M. (Robert Michael) |
title |
Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids |
title_short |
Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids |
title_full |
Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids |
title_fullStr |
Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids |
title_full_unstemmed |
Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids |
title_sort |
mitochondrial genomics and northwestern atlantic population genetics of marine annelids |
publisher |
Massachusetts Institute of Technology |
publishDate |
2005 |
url |
http://hdl.handle.net/1721.1/39191 http://dspace.mit.edu/handle/1721.1/39191 |
geographic |
Long Island |
geographic_facet |
Long Island |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
http://dspace.mit.edu/handle/1721.1/39191 http://hdl.handle.net/1721.1/39191 65197302 |
op_rights |
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/39191 http://dspace.mit.edu/handle/1721.1/7582 |
_version_ |
1768372227543138304 |