The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity
Lasaea is a genus of molluscs that primarily consists of minute, hermaphroditic bivalves that occupy rocky shores worldwide. The majority of Lasaea species are asexual, polyploid, direct developers. However, two Australian species are exceptions: Lasaea australis is sexual, diploid and has planktotr...
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ftunivotagoour:oai:ourarchive.otago.ac.nz:10523/9580 2023-05-15T13:52:08+02:00 The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity Lockton, Katherine Spencer, Hamish 2019-09-03T10:35:13Z application/pdf http://hdl.handle.net/10523/9580 en eng University of Otago http://hdl.handle.net/10523/9580 All items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated. Phylogeography New Zealand Lasaea Mollusc Genetic Analysis Thesis or Dissertation 2019 ftunivotagoour 2022-05-11T19:21:56Z Lasaea is a genus of molluscs that primarily consists of minute, hermaphroditic bivalves that occupy rocky shores worldwide. The majority of Lasaea species are asexual, polyploid, direct developers. However, two Australian species are exceptions: Lasaea australis is sexual, diploid and has planktotrophic development, whereas Lasaea colmani is sexual, diploid and direct developing. The New Zealand species Lasaea hinemoa has not been phylogeographically studied. I investigated the phylogeography of L. hinemoa using mitochondrial and nuclear gene sequencing (COIII and ITS2, respectively). Additionally, I investigated population-level structuring around Dunedin using microsatellite markers that I developed. It was elucidated that the individuals that underwent genetic investigation consisted of four clades (Clade I, Clade II, Clade III and Clade IV). Clade I and Clade III dominated in New Zealand and support was garnered through gene sequencing and microsatellite analysis for these clades to represent separate cryptic species, with biogeographic splitting present. Clade II consisted of individuals that had been collected from the Antipodes Island. The Antipodes Island contained individuals from two clades (Clade I and Clade II), with Lasaea from the Kerguelen Islands being more closely related to individuals from Clade II than Clade I was to Clade II. This genetic distinction between Clade I and Clade II seemed to indicate transoceanic dispersal via the Antarctic Circumpolar Current (ACC) between the Kerguelen Islands and Antipodes Island. Clade IV clustered very distinctly from L. hinemoa, appearing to represent transoceanic dispersal by another Lasaea species. Thesis Antarc* Antarctic Antipodes Island Kerguelen Islands University of Otago: Research Archive (OUR Archive) Antarctic Kerguelen Kerguelen Islands New Zealand The Antarctic |
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Open Polar |
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University of Otago: Research Archive (OUR Archive) |
op_collection_id |
ftunivotagoour |
language |
English |
topic |
Phylogeography New Zealand Lasaea Mollusc Genetic Analysis |
spellingShingle |
Phylogeography New Zealand Lasaea Mollusc Genetic Analysis Lockton, Katherine The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity |
topic_facet |
Phylogeography New Zealand Lasaea Mollusc Genetic Analysis |
description |
Lasaea is a genus of molluscs that primarily consists of minute, hermaphroditic bivalves that occupy rocky shores worldwide. The majority of Lasaea species are asexual, polyploid, direct developers. However, two Australian species are exceptions: Lasaea australis is sexual, diploid and has planktotrophic development, whereas Lasaea colmani is sexual, diploid and direct developing. The New Zealand species Lasaea hinemoa has not been phylogeographically studied. I investigated the phylogeography of L. hinemoa using mitochondrial and nuclear gene sequencing (COIII and ITS2, respectively). Additionally, I investigated population-level structuring around Dunedin using microsatellite markers that I developed. It was elucidated that the individuals that underwent genetic investigation consisted of four clades (Clade I, Clade II, Clade III and Clade IV). Clade I and Clade III dominated in New Zealand and support was garnered through gene sequencing and microsatellite analysis for these clades to represent separate cryptic species, with biogeographic splitting present. Clade II consisted of individuals that had been collected from the Antipodes Island. The Antipodes Island contained individuals from two clades (Clade I and Clade II), with Lasaea from the Kerguelen Islands being more closely related to individuals from Clade II than Clade I was to Clade II. This genetic distinction between Clade I and Clade II seemed to indicate transoceanic dispersal via the Antarctic Circumpolar Current (ACC) between the Kerguelen Islands and Antipodes Island. Clade IV clustered very distinctly from L. hinemoa, appearing to represent transoceanic dispersal by another Lasaea species. |
author2 |
Spencer, Hamish |
format |
Thesis |
author |
Lockton, Katherine |
author_facet |
Lockton, Katherine |
author_sort |
Lockton, Katherine |
title |
The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity |
title_short |
The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity |
title_full |
The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity |
title_fullStr |
The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity |
title_full_unstemmed |
The Genetic Analysis of Lasaea hinemoa: The Story of an Evolutionary Oddity |
title_sort |
genetic analysis of lasaea hinemoa: the story of an evolutionary oddity |
publisher |
University of Otago |
publishDate |
2019 |
url |
http://hdl.handle.net/10523/9580 |
geographic |
Antarctic Kerguelen Kerguelen Islands New Zealand The Antarctic |
geographic_facet |
Antarctic Kerguelen Kerguelen Islands New Zealand The Antarctic |
genre |
Antarc* Antarctic Antipodes Island Kerguelen Islands |
genre_facet |
Antarc* Antarctic Antipodes Island Kerguelen Islands |
op_relation |
http://hdl.handle.net/10523/9580 |
op_rights |
All items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated. |
_version_ |
1766256394423500800 |