The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica
Widely dispersing species experience a variety of abiotic or biotic variables that can affect their distribution and their population genetic differentiation. These variables can be subtle such as differences in microhabitat or community assemblage or more obvious such as continental drift or glacia...
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ftunivgeorgia:oai:athenaeum.libs.uga.edu:10724/25736 2023-05-15T17:31:37+02:00 The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica Bell, Tina Marie 2009-08 http://hdl.handle.net/10724/25736 http://purl.galileo.usg.edu/uga_etd/bell_tina_m_200908_phd eng eng uga bell_tina_m_200908_phd http://purl.galileo.usg.edu/uga_etd/bell_tina_m_200908_phd http://hdl.handle.net/10724/25736 public North Atlantic Idotea balthica feeding behavior phylogeography reproductive isolation sexual isolation speciation mtCOI gut contents genetic diversity Dissertation 2009 ftunivgeorgia 2020-09-23T12:13:31Z Widely dispersing species experience a variety of abiotic or biotic variables that can affect their distribution and their population genetic differentiation. These variables can be subtle such as differences in microhabitat or community assemblage or more obvious such as continental drift or glaciation. The interaction of these variables and their ability to constrain or facilitate gene flow between populations are addressed along the North American coastline with the marine isopod, Idotea balthica. This species shows latitudinal population genetic differentiation in the gene, mitochondrial cytochrome oxidase I (mtCOI). The mechanisms that created and currently maintain this pattern in population genetic diversity in this species are unknown. This study addressed whether North American populations of I. balthica are defined by distinct feeding behaviors and whether feeding preference could be a diversity maintaining mechanism in this species. Feeding assays showed that feeding preferences did differ between North American populations. Southern populations consume Zostera marina at a higher rate than northern populations while northern populations consume more Fucus vesiculosus than southern populations. PCR-based gut content analyses revealed that northern populations tend to be more selective in their food choices than those in southern populations. Partial reproductive barriers were found from inter-population crosses where fecundity and offspring survivorship were reduced from intra-population crosses. This finding suggests that reproductive barriers may be maintaining genetic diversity in this species and that North American populations of I. balthica may actually be incipient species. The historical dispersal patterns of this species between North America and Europe post-glaciation are also addressed but remain inconclusive. PhD Genetics Genetics John P. Wares John P. Wares Erik Sotka Dave Moeller Rodney Mauricio Michael Arnold Doctoral or Postdoctoral Thesis North Atlantic University of Georgia: Athenaeum@UGA Sotka ENVELOPE(28.667,28.667,66.817,66.817) |
institution |
Open Polar |
collection |
University of Georgia: Athenaeum@UGA |
op_collection_id |
ftunivgeorgia |
language |
English |
topic |
North Atlantic Idotea balthica feeding behavior phylogeography reproductive isolation sexual isolation speciation mtCOI gut contents genetic diversity |
spellingShingle |
North Atlantic Idotea balthica feeding behavior phylogeography reproductive isolation sexual isolation speciation mtCOI gut contents genetic diversity Bell, Tina Marie The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica |
topic_facet |
North Atlantic Idotea balthica feeding behavior phylogeography reproductive isolation sexual isolation speciation mtCOI gut contents genetic diversity |
description |
Widely dispersing species experience a variety of abiotic or biotic variables that can affect their distribution and their population genetic differentiation. These variables can be subtle such as differences in microhabitat or community assemblage or more obvious such as continental drift or glaciation. The interaction of these variables and their ability to constrain or facilitate gene flow between populations are addressed along the North American coastline with the marine isopod, Idotea balthica. This species shows latitudinal population genetic differentiation in the gene, mitochondrial cytochrome oxidase I (mtCOI). The mechanisms that created and currently maintain this pattern in population genetic diversity in this species are unknown. This study addressed whether North American populations of I. balthica are defined by distinct feeding behaviors and whether feeding preference could be a diversity maintaining mechanism in this species. Feeding assays showed that feeding preferences did differ between North American populations. Southern populations consume Zostera marina at a higher rate than northern populations while northern populations consume more Fucus vesiculosus than southern populations. PCR-based gut content analyses revealed that northern populations tend to be more selective in their food choices than those in southern populations. Partial reproductive barriers were found from inter-population crosses where fecundity and offspring survivorship were reduced from intra-population crosses. This finding suggests that reproductive barriers may be maintaining genetic diversity in this species and that North American populations of I. balthica may actually be incipient species. The historical dispersal patterns of this species between North America and Europe post-glaciation are also addressed but remain inconclusive. PhD Genetics Genetics John P. Wares John P. Wares Erik Sotka Dave Moeller Rodney Mauricio Michael Arnold |
format |
Doctoral or Postdoctoral Thesis |
author |
Bell, Tina Marie |
author_facet |
Bell, Tina Marie |
author_sort |
Bell, Tina Marie |
title |
The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica |
title_short |
The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica |
title_full |
The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica |
title_fullStr |
The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica |
title_full_unstemmed |
The maintenance of genetic diversity in the North Atlantic isopod, Idotea balthica |
title_sort |
maintenance of genetic diversity in the north atlantic isopod, idotea balthica |
publisher |
uga |
publishDate |
2009 |
url |
http://hdl.handle.net/10724/25736 http://purl.galileo.usg.edu/uga_etd/bell_tina_m_200908_phd |
long_lat |
ENVELOPE(28.667,28.667,66.817,66.817) |
geographic |
Sotka |
geographic_facet |
Sotka |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
bell_tina_m_200908_phd http://purl.galileo.usg.edu/uga_etd/bell_tina_m_200908_phd http://hdl.handle.net/10724/25736 |
op_rights |
public |
_version_ |
1766129285732499456 |