The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics
Typescript Thesis (PhD) -- University of Melbourne, Faculty of Science, 2006 Includes bibliographical references (leaves 178-189) The morphology of Antarctic krill, Euphausia superba, has traditionally been described using measures of size, such as total length, carapace length, and uropod length, o...
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ftumelbourne:oai:jupiter.its.unimelb.edu.au:11343/342191 2024-06-02T07:58:05+00:00 The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics Finley, Luke, (Marine biologist) 2006 http://hdl.handle.net/11343/342191 English eng University of Melbourne THSS_b3088039-00001 http://hdl.handle.net/11343/342191 Copyright in works deposited in Minerva Access is retained by the copyright owner. The work may not be altered without permission from the copyright owner. Readers may only download, print and save electronic copies of whole works for their own personal non-commercial use. Any use that exceeds these limits requires permission from the copyright owner. Attribution is essential when quoting or paraphrasing from these works. Krill Krill -- Antarctic Ocean Marine biology -- Antarctic Ocean Geometric measure theory PhD thesis 2006 ftumelbourne 2024-05-06T14:34:20Z Typescript Thesis (PhD) -- University of Melbourne, Faculty of Science, 2006 Includes bibliographical references (leaves 178-189) The morphology of Antarctic krill, Euphausia superba, has traditionally been described using measures of size, such as total length, carapace length, and uropod length, or weight, or a combination of these. These measures are then used to derive other biological parameters such as growth rate, recruitment size, and biomass. Despite well- established protocols for deriving parameters from linear measurements, this practise can be problematic because krill can shrink. There is therefore a need to develop new methods that do not rely on length measurements for studying krill population structure and this thesis describes such work. Geometric morphometrics (GM) provides a possible alternative to using linear measurements for describing body morphology, and to date has not been used to study krill populations. One of the GM methods uses landmarks to capture the geometry of morphological structures independently of size and this allows size to be compared to shape, rather than shape being described using size measures. Differences in shape can then be described within- and between- groups of specimens. A series of freeware programs enable a trained operator to facilitate the shape analysis process. In this study, live and preserved krill specimens were gathered from various locations around Antarctica. The lateral aspect of the carapace was photographed and six landmarks were digitised to capture the geometry of the carapace. Traditional size variables were measured during the GM analysis so that the relative success of the GM method against existing methods could be reported. The specimens selected for the GM analysis were compared to the sampled population using the relationship between carapace length and total length for different maturity stages. This relationship was similar between female maturity stages, whereas male krill displayed carapace dimorphism between maturity stages. ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctic Krill Antarctic Ocean Antarctica Euphausia superba The University of Melbourne: Digital Repository Antarctic Antarctic Ocean |
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Open Polar |
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The University of Melbourne: Digital Repository |
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ftumelbourne |
language |
English |
topic |
Krill Krill -- Antarctic Ocean Marine biology -- Antarctic Ocean Geometric measure theory |
spellingShingle |
Krill Krill -- Antarctic Ocean Marine biology -- Antarctic Ocean Geometric measure theory Finley, Luke, (Marine biologist) The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics |
topic_facet |
Krill Krill -- Antarctic Ocean Marine biology -- Antarctic Ocean Geometric measure theory |
description |
Typescript Thesis (PhD) -- University of Melbourne, Faculty of Science, 2006 Includes bibliographical references (leaves 178-189) The morphology of Antarctic krill, Euphausia superba, has traditionally been described using measures of size, such as total length, carapace length, and uropod length, or weight, or a combination of these. These measures are then used to derive other biological parameters such as growth rate, recruitment size, and biomass. Despite well- established protocols for deriving parameters from linear measurements, this practise can be problematic because krill can shrink. There is therefore a need to develop new methods that do not rely on length measurements for studying krill population structure and this thesis describes such work. Geometric morphometrics (GM) provides a possible alternative to using linear measurements for describing body morphology, and to date has not been used to study krill populations. One of the GM methods uses landmarks to capture the geometry of morphological structures independently of size and this allows size to be compared to shape, rather than shape being described using size measures. Differences in shape can then be described within- and between- groups of specimens. A series of freeware programs enable a trained operator to facilitate the shape analysis process. In this study, live and preserved krill specimens were gathered from various locations around Antarctica. The lateral aspect of the carapace was photographed and six landmarks were digitised to capture the geometry of the carapace. Traditional size variables were measured during the GM analysis so that the relative success of the GM method against existing methods could be reported. The specimens selected for the GM analysis were compared to the sampled population using the relationship between carapace length and total length for different maturity stages. This relationship was similar between female maturity stages, whereas male krill displayed carapace dimorphism between maturity stages. ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Finley, Luke, (Marine biologist) |
author_facet |
Finley, Luke, (Marine biologist) |
author_sort |
Finley, Luke, (Marine biologist) |
title |
The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics |
title_short |
The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics |
title_full |
The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics |
title_fullStr |
The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics |
title_full_unstemmed |
The biology of Antarctic krill : investigating the shape of krill using geometric morphometrics |
title_sort |
biology of antarctic krill : investigating the shape of krill using geometric morphometrics |
publisher |
University of Melbourne |
publishDate |
2006 |
url |
http://hdl.handle.net/11343/342191 |
geographic |
Antarctic Antarctic Ocean |
geographic_facet |
Antarctic Antarctic Ocean |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Ocean Antarctica Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Ocean Antarctica Euphausia superba |
op_relation |
THSS_b3088039-00001 http://hdl.handle.net/11343/342191 |
op_rights |
Copyright in works deposited in Minerva Access is retained by the copyright owner. The work may not be altered without permission from the copyright owner. Readers may only download, print and save electronic copies of whole works for their own personal non-commercial use. Any use that exceeds these limits requires permission from the copyright owner. Attribution is essential when quoting or paraphrasing from these works. |
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