@ARTICLE{TreeBASE2Ref15930,
author = {Rebecca L. Hunter and Kenneth M. Halanych},
title = {Evaluating connectivity in the brooding brittle star Astrotoma agassizii across the Drake Passage in the Southern Ocean},
year = {2008},
keywords = {},
doi = {},
url = {},
pmid = {},
journal = {Journal of Heredity},
volume = {99},
number = {},
pages = {137--148},
abstract = {Studies examining population structure and genetic diversity of benthic marine invertebrates in the Southern Ocean have emerged in recent years. However, many taxonomic groups remain largely unstudied, echinoderms being one conspicuous example. The brittle star Astrotoma agassizii is distributed widely throughout Antarctica and southern South America. This species is a brooding echinoderm and therefore may have limited dispersal capacity. In order to determine the effect of hypothesized isolating barriers in the Southern Ocean, such as depth, geographic distance and the Polar Front, two mtDNA markers were used to compare populations from the South American and Antarctic continental shelves. Astrotoma agassizii was shown to be genetically discontinuous across the Polar Front. In fact, populations previously assumed to be panmictic instead represent three separate lineages that lack morphological distinction. However, within lineages, genetic continuity was displayed across a large geographic range (> 500 km). Therefore, despite lacking a pelagic larval stage, A. agassizii can disperse across substantial geographic distance within continental shelf regions. These results indicate that geographic distance alone may not be a barrier to dispersal, but rather the combined effects of distance, depth and the Polar Front act to prevent gene flow between A. agassizii populations in the Southern Ocean.}
}
Citation for Study 2013
Citation title:
"Evaluating connectivity in the brooding brittle star Astrotoma agassizii across the Drake Passage in the Southern Ocean".
This study was previously identified under the legacy study ID S2005
(Status: Published).
Citation
Hunter R., & Halanych K. 2008. Evaluating connectivity in the brooding brittle star Astrotoma agassizii across the Drake Passage in the Southern Ocean. Journal of Heredity, 99: 137-148.
Authors
Abstract
Studies examining population structure and genetic diversity of benthic marine invertebrates in the Southern Ocean have emerged in recent years. However, many taxonomic groups remain largely unstudied, echinoderms being one conspicuous example. The brittle star Astrotoma agassizii is distributed widely throughout Antarctica and southern South America. This species is a brooding echinoderm and therefore may have limited dispersal capacity. In order to determine the effect of hypothesized isolating barriers in the Southern Ocean, such as depth, geographic distance and the Polar Front, two mtDNA markers were used to compare populations from the South American and Antarctic continental shelves. Astrotoma agassizii was shown to be genetically discontinuous across the Polar Front. In fact, populations previously assumed to be panmictic instead represent three separate lineages that lack morphological distinction. However, within lineages, genetic continuity was displayed across a large geographic range (> 500 km). Therefore, despite lacking a pelagic larval stage, A. agassizii can disperse across substantial geographic distance within continental shelf regions. These results indicate that geographic distance alone may not be a barrier to dispersal, but rather the combined effects of distance, depth and the Polar Front act to prevent gene flow between A. agassizii populations in the Southern Ocean.
About this resource
- Canonical resource URI:
http://purl.org/phylo/treebase/phylows/study/TB2:S2013
- Other versions:
Nexus
NeXML
- Show BibTeX reference
@ARTICLE{TreeBASE2Ref15930,
author = {Rebecca L. Hunter and Kenneth M. Halanych},
title = {Evaluating connectivity in the brooding brittle star Astrotoma agassizii across the Drake Passage in the Southern Ocean},
year = {2008},
keywords = {},
doi = {},
url = {},
pmid = {},
journal = {Journal of Heredity},
volume = {99},
number = {},
pages = {137--148},
abstract = {Studies examining population structure and genetic diversity of benthic marine invertebrates in the Southern Ocean have emerged in recent years. However, many taxonomic groups remain largely unstudied, echinoderms being one conspicuous example. The brittle star Astrotoma agassizii is distributed widely throughout Antarctica and southern South America. This species is a brooding echinoderm and therefore may have limited dispersal capacity. In order to determine the effect of hypothesized isolating barriers in the Southern Ocean, such as depth, geographic distance and the Polar Front, two mtDNA markers were used to compare populations from the South American and Antarctic continental shelves. Astrotoma agassizii was shown to be genetically discontinuous across the Polar Front. In fact, populations previously assumed to be panmictic instead represent three separate lineages that lack morphological distinction. However, within lineages, genetic continuity was displayed across a large geographic range (> 500 km). Therefore, despite lacking a pelagic larval stage, A. agassizii can disperse across substantial geographic distance within continental shelf regions. These results indicate that geographic distance alone may not be a barrier to dispersal, but rather the combined effects of distance, depth and the Polar Front act to prevent gene flow between A. agassizii populations in the Southern Ocean.}
}
- Show RIS reference
TY - JOUR
ID - 15930
AU - Hunter,Rebecca L.
AU - Halanych,Kenneth M.
T1 - Evaluating connectivity in the brooding brittle star Astrotoma agassizii across the Drake Passage in the Southern Ocean
PY - 2008
UR -
N2 - Studies examining population structure and genetic diversity of benthic marine invertebrates in the Southern Ocean have emerged in recent years. However, many taxonomic groups remain largely unstudied, echinoderms being one conspicuous example. The brittle star Astrotoma agassizii is distributed widely throughout Antarctica and southern South America. This species is a brooding echinoderm and therefore may have limited dispersal capacity. In order to determine the effect of hypothesized isolating barriers in the Southern Ocean, such as depth, geographic distance and the Polar Front, two mtDNA markers were used to compare populations from the South American and Antarctic continental shelves. Astrotoma agassizii was shown to be genetically discontinuous across the Polar Front. In fact, populations previously assumed to be panmictic instead represent three separate lineages that lack morphological distinction. However, within lineages, genetic continuity was displayed across a large geographic range (> 500 km). Therefore, despite lacking a pelagic larval stage, A. agassizii can disperse across substantial geographic distance within continental shelf regions. These results indicate that geographic distance alone may not be a barrier to dispersal, but rather the combined effects of distance, depth and the Polar Front act to prevent gene flow between A. agassizii populations in the Southern Ocean.
L3 -
JF - Journal of Heredity
VL - 99
IS -
SP - 137
EP - 148
ER -
Go to search
Citation
Taxa
Matrices
Trees
Analyses
