Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida)
Sea spiders, or pycnogonids, are a unique group of exclusively marine invertebrates that are found worldwide. A scarcity of pycnogonid research is reflected in the unclear position of this group with regards to the phylum Arthropoda and lack of certainty in their family-level phylogeny. Traditionall...
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ftunivauckland:oai:researchspace.auckland.ac.nz:2292/5367 2023-05-15T13:58:51+02:00 Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida) Nielsen, Johanna Fønss. 2005 http://hdl.handle.net/2292/5367 unknown ResearchSpace@Auckland Honours Thesis - University of Auckland UoA1579194 Whole document restricted but available by request. Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm Copyright: The author http://purl.org/eprint/accessRights/RestrictedAccess Fields of Research::270000 Biological Sciences Thesis 2005 ftunivauckland 2013-12-07T08:43:18Z Sea spiders, or pycnogonids, are a unique group of exclusively marine invertebrates that are found worldwide. A scarcity of pycnogonid research is reflected in the unclear position of this group with regards to the phylum Arthropoda and lack of certainty in their family-level phylogeny. Traditionally, the pycnogonid phylogeny has relied on the external morphological characters of temperate, shallow water species. The Antarctic sea spider fauna displays a high degree of endemism and a number of species have the potential to address several long-standing questions regarding the pycnogonid evolution. This research uses new sequence data from Antarctic species to provide the most complete molecular phylogenetic reconstructions of the Pycnogonida, and is the first study to formally test a number of alternative hypotheses on the interfamilial relationships of this group of organisms. The BioRoss 2004 pycnogonid collection was classified into 18 different OTUs (5 families & 10 genera) and used, in combination with publicly accessible sequences, to provide samples for this study. Partial regions of the nuclear 18S and 28S rDNA, mitochondrial 12S and 16S rDNA and protein coding COI loci were sequenced for each dataset, and the concatenated data tested for incongruence using the Partition of Homogeneity test. The distance based Neighbour Joining and character based Maximum Likelihood tree-building algorithms were used to reconstruct the pycnogonid phylogeny for each locus independently and as a concatenated dataset. A series of alternative evolutionary hypotheses based on previous studies were examined via the Shimodaira-Hasegawa test. The primary hypothesis examined was the cephalic appendage reductive trend, which implies that ancestral sea spider taxa possess the greatest complexity of anterior appendages. On all the individual locus trees the family Nymphonidae were the earliest diverged lineage of pycnogonids, although low resolution at the roots of the trees implies that the data are not strong enough to reject an alternative hypothesis of a basal Ammotheidae group. Pycnogonidae is not the most recently derived sea spider family and the cephalic appendage loss hypothesis is thus rejected. None of the phylogenies supported a close relationship between the Colossendeidae and Nymphonidae families and doubt is raised over the true identification of several GenBank sequences. Polymerous species do not form a combined, ancestral group but are instead more likely to represent recent divergences from three separate families. Strong evidence supports the placement of the transient Austropallene genus (Callipallenidae) at the base of the Nymphonidae family. This study, and ongoing work, has generated large amounts of new sequence data. This can be used in future pycnogonid phylogenetic research and/or in investigations on the highly contentious position of the Pycnogonida with regards to the phylum Arthropoda. A DNA Surveillance website has been created to assist in the molecular identification of pycnogonids from future benthic bio-discovery expeditions (http://www.dna-surveillance.auckland.ac.nz). Whole document restricted, but available by request, use the feedback form to request access. Thesis Antarc* Antarctic University of Auckland Research Repository - ResearchSpace Antarctic The Antarctic |
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University of Auckland Research Repository - ResearchSpace |
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ftunivauckland |
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Fields of Research::270000 Biological Sciences |
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Fields of Research::270000 Biological Sciences Nielsen, Johanna Fønss. Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida) |
topic_facet |
Fields of Research::270000 Biological Sciences |
description |
Sea spiders, or pycnogonids, are a unique group of exclusively marine invertebrates that are found worldwide. A scarcity of pycnogonid research is reflected in the unclear position of this group with regards to the phylum Arthropoda and lack of certainty in their family-level phylogeny. Traditionally, the pycnogonid phylogeny has relied on the external morphological characters of temperate, shallow water species. The Antarctic sea spider fauna displays a high degree of endemism and a number of species have the potential to address several long-standing questions regarding the pycnogonid evolution. This research uses new sequence data from Antarctic species to provide the most complete molecular phylogenetic reconstructions of the Pycnogonida, and is the first study to formally test a number of alternative hypotheses on the interfamilial relationships of this group of organisms. The BioRoss 2004 pycnogonid collection was classified into 18 different OTUs (5 families & 10 genera) and used, in combination with publicly accessible sequences, to provide samples for this study. Partial regions of the nuclear 18S and 28S rDNA, mitochondrial 12S and 16S rDNA and protein coding COI loci were sequenced for each dataset, and the concatenated data tested for incongruence using the Partition of Homogeneity test. The distance based Neighbour Joining and character based Maximum Likelihood tree-building algorithms were used to reconstruct the pycnogonid phylogeny for each locus independently and as a concatenated dataset. A series of alternative evolutionary hypotheses based on previous studies were examined via the Shimodaira-Hasegawa test. The primary hypothesis examined was the cephalic appendage reductive trend, which implies that ancestral sea spider taxa possess the greatest complexity of anterior appendages. On all the individual locus trees the family Nymphonidae were the earliest diverged lineage of pycnogonids, although low resolution at the roots of the trees implies that the data are not strong enough to reject an alternative hypothesis of a basal Ammotheidae group. Pycnogonidae is not the most recently derived sea spider family and the cephalic appendage loss hypothesis is thus rejected. None of the phylogenies supported a close relationship between the Colossendeidae and Nymphonidae families and doubt is raised over the true identification of several GenBank sequences. Polymerous species do not form a combined, ancestral group but are instead more likely to represent recent divergences from three separate families. Strong evidence supports the placement of the transient Austropallene genus (Callipallenidae) at the base of the Nymphonidae family. This study, and ongoing work, has generated large amounts of new sequence data. This can be used in future pycnogonid phylogenetic research and/or in investigations on the highly contentious position of the Pycnogonida with regards to the phylum Arthropoda. A DNA Surveillance website has been created to assist in the molecular identification of pycnogonids from future benthic bio-discovery expeditions (http://www.dna-surveillance.auckland.ac.nz). Whole document restricted, but available by request, use the feedback form to request access. |
format |
Thesis |
author |
Nielsen, Johanna Fønss. |
author_facet |
Nielsen, Johanna Fønss. |
author_sort |
Nielsen, Johanna Fønss. |
title |
Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida) |
title_short |
Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida) |
title_full |
Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida) |
title_fullStr |
Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida) |
title_full_unstemmed |
Molecular phylogenetics of Antarctic Sea spiders (Pycnogonida) |
title_sort |
molecular phylogenetics of antarctic sea spiders (pycnogonida) |
publisher |
ResearchSpace@Auckland |
publishDate |
2005 |
url |
http://hdl.handle.net/2292/5367 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Honours Thesis - University of Auckland UoA1579194 |
op_rights |
Whole document restricted but available by request. Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm Copyright: The author http://purl.org/eprint/accessRights/RestrictedAccess |
_version_ |
1766267225419808768 |