Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics
Synaphobranchus eels are difficult to identify at species level. A literature study of previous taxonomic work on these species revealed several inconsistencies concerning the diagnostic characters of Synaphobranchus kaupii and Synaphobranchus affinis. One hundred and eleven specimens from the mid-A...
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The University of Bergen
2009
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ftunivbergen:oai:bora.uib.no:1956/3216 2023-05-15T17:34:16+02:00 Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics Svendsen, Fred Marius 2009-01-30 2894809 bytes application/pdf https://hdl.handle.net/1956/3216 eng eng The University of Bergen https://hdl.handle.net/1956/3216 The author Copyright the author. All rights reserved DNA-strekkoding Taksonomi Atlanterhavsryggen https://data.ub.uio.no/realfagstermer/c009624 https://data.ub.uio.no/realfagstermer/c031781 https://data.ub.uio.no/realfagstermer/c032059 759906 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Master thesis 2009 ftunivbergen 2023-03-14T17:43:39Z Synaphobranchus eels are difficult to identify at species level. A literature study of previous taxonomic work on these species revealed several inconsistencies concerning the diagnostic characters of Synaphobranchus kaupii and Synaphobranchus affinis. One hundred and eleven specimens from the mid-Atlantic ridge and a type specimen of S. affinis were examined morphologically, and the DNA barcode region of the mitochondrial COI gene was sequenced from 60 of these specimens. The results of this examination showed an ontogenetic change in most morphometric characters and that most of the previously used diagnostic characters, namely dorsal fin origin in relation to the vent, predorsal length, scale shape and pattern, and dentition, cannot distinguish between the species S. kaupii and S. affinis. All the examined MAR-ECO specimens are in accordance with the original description of S. kaupii by Johnson (1862) and have a high number of vertebrae, hence all are identified as S. kaupii. The type specimen of S. affinis may represent a member of a cryptic species that closely resembles S. kaupii, separable by having a lower number of vertebrae, but a geographical expansion of this study is needed to resolve this taxonomic issue. Master i Marin biodiversitet MAMN-MARBI MARINDIV Master Thesis North Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Mid-Atlantic Ridge |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
DNA-strekkoding Taksonomi Atlanterhavsryggen https://data.ub.uio.no/realfagstermer/c009624 https://data.ub.uio.no/realfagstermer/c031781 https://data.ub.uio.no/realfagstermer/c032059 759906 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 |
spellingShingle |
DNA-strekkoding Taksonomi Atlanterhavsryggen https://data.ub.uio.no/realfagstermer/c009624 https://data.ub.uio.no/realfagstermer/c031781 https://data.ub.uio.no/realfagstermer/c032059 759906 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 Svendsen, Fred Marius Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics |
topic_facet |
DNA-strekkoding Taksonomi Atlanterhavsryggen https://data.ub.uio.no/realfagstermer/c009624 https://data.ub.uio.no/realfagstermer/c031781 https://data.ub.uio.no/realfagstermer/c032059 759906 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497 |
description |
Synaphobranchus eels are difficult to identify at species level. A literature study of previous taxonomic work on these species revealed several inconsistencies concerning the diagnostic characters of Synaphobranchus kaupii and Synaphobranchus affinis. One hundred and eleven specimens from the mid-Atlantic ridge and a type specimen of S. affinis were examined morphologically, and the DNA barcode region of the mitochondrial COI gene was sequenced from 60 of these specimens. The results of this examination showed an ontogenetic change in most morphometric characters and that most of the previously used diagnostic characters, namely dorsal fin origin in relation to the vent, predorsal length, scale shape and pattern, and dentition, cannot distinguish between the species S. kaupii and S. affinis. All the examined MAR-ECO specimens are in accordance with the original description of S. kaupii by Johnson (1862) and have a high number of vertebrae, hence all are identified as S. kaupii. The type specimen of S. affinis may represent a member of a cryptic species that closely resembles S. kaupii, separable by having a lower number of vertebrae, but a geographical expansion of this study is needed to resolve this taxonomic issue. Master i Marin biodiversitet MAMN-MARBI MARINDIV |
format |
Master Thesis |
author |
Svendsen, Fred Marius |
author_facet |
Svendsen, Fred Marius |
author_sort |
Svendsen, Fred Marius |
title |
Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics |
title_short |
Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics |
title_full |
Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics |
title_fullStr |
Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics |
title_full_unstemmed |
Morphological and genetic variation in North Atlantic synaphobranchid eels in relation to species diagnostics |
title_sort |
morphological and genetic variation in north atlantic synaphobranchid eels in relation to species diagnostics |
publisher |
The University of Bergen |
publishDate |
2009 |
url |
https://hdl.handle.net/1956/3216 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://hdl.handle.net/1956/3216 |
op_rights |
The author Copyright the author. All rights reserved |
_version_ |
1766133051100758016 |