Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei)
The suborder Notothenioidei (Teleostei) has undergone a remarkable adaptive radiation in the Southern Ocean. Within this suborder, the subfamily Trematominae is endemic to Antarctic waters and represents a dominant component of the shelf fish fauna. After recent advances in molecular phylogenetics,...
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ftorbi:oai:orbi.ulg.ac.be:2268/204554 2024-04-21T07:47:32+00:00 Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei) Frederich, Bruno Heindler, Franz M. Dettai, Agnès Christiansen, Henrik Van De Putte, Anton Lepoint, Gilles MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège 2016-12-16 A0 https://orbi.uliege.be/handle/2268/204554 en eng https://orbi.uliege.be/handle/2268/204554 info:hdl:2268/204554 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Zoology 2016, Antwerp, Belgium [BE], du 15 décembre 2016 au 17 décembre 2016 Disparity morphospace geometric morphometric icefishes cephalic region shape variation Southern Ocean Life sciences Zoology Sciences du vivant Zoologie conference poster not in proceedings http://purl.org/coar/resource_type/c_18co info:eu-repo/semantics/conferencePoster 2016 ftorbi 2024-03-27T14:47:50Z The suborder Notothenioidei (Teleostei) has undergone a remarkable adaptive radiation in the Southern Ocean. Within this suborder, the subfamily Trematominae is endemic to Antarctic waters and represents a dominant component of the shelf fish fauna. After recent advances in molecular phylogenetics, 14 species of Trematomus are currently recognized (including Pagothenia and Cryothenia spp.) comprising both considerable morphological and ecological diversity. Here, we aim to illustrate the main axes of shape variation in Trematomus and explore the evolution of their morphology. A dataset of 96 specimens representing 10 species of Trematomus from the collection of the Natural History Museum of Paris was assembled, and landmark-based geometric morphometrics was applied to quantify head shape disparity. Regular regression analysis revealed significant interspecific allometry while a low percentage of shape variation was explained by size (R2 = 0.11; P < 0.001). Main shape variation across species was explored using a principal component (PC) analysis on shape variables. Two groups diverged along PC1: (1) T. bernacchii, T. hansoni, T. pennellii and T. tokarevi have short cephalic profiles with larger cheeks (lowest values along PC1); and (2) T. lepidorhinus, T. eulepidotus and T. newnesi show lengthened cephalic profiles with larger eyes (highest values along PC1). Trematomus scotti differed from all other species mainly along PC3 indicating more elongated cheeks. Phenogram based on Procrustes shape distances will be compared to molecular phylogenetic trees and morphometric data will be mapped onto phylogenetic trees in order to illustrate the mode of phenotypic diversification of Trematomus during evolution. Refugia and Ecosystem Tolerance in the Southern Ocean Conference Object Antarc* Antarctic Southern Ocean University of Liège: ORBi (Open Repository and Bibliography) |
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Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
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ftorbi |
language |
English |
topic |
Disparity morphospace geometric morphometric icefishes cephalic region shape variation Southern Ocean Life sciences Zoology Sciences du vivant Zoologie |
spellingShingle |
Disparity morphospace geometric morphometric icefishes cephalic region shape variation Southern Ocean Life sciences Zoology Sciences du vivant Zoologie Frederich, Bruno Heindler, Franz M. Dettai, Agnès Christiansen, Henrik Van De Putte, Anton Lepoint, Gilles Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei) |
topic_facet |
Disparity morphospace geometric morphometric icefishes cephalic region shape variation Southern Ocean Life sciences Zoology Sciences du vivant Zoologie |
description |
The suborder Notothenioidei (Teleostei) has undergone a remarkable adaptive radiation in the Southern Ocean. Within this suborder, the subfamily Trematominae is endemic to Antarctic waters and represents a dominant component of the shelf fish fauna. After recent advances in molecular phylogenetics, 14 species of Trematomus are currently recognized (including Pagothenia and Cryothenia spp.) comprising both considerable morphological and ecological diversity. Here, we aim to illustrate the main axes of shape variation in Trematomus and explore the evolution of their morphology. A dataset of 96 specimens representing 10 species of Trematomus from the collection of the Natural History Museum of Paris was assembled, and landmark-based geometric morphometrics was applied to quantify head shape disparity. Regular regression analysis revealed significant interspecific allometry while a low percentage of shape variation was explained by size (R2 = 0.11; P < 0.001). Main shape variation across species was explored using a principal component (PC) analysis on shape variables. Two groups diverged along PC1: (1) T. bernacchii, T. hansoni, T. pennellii and T. tokarevi have short cephalic profiles with larger cheeks (lowest values along PC1); and (2) T. lepidorhinus, T. eulepidotus and T. newnesi show lengthened cephalic profiles with larger eyes (highest values along PC1). Trematomus scotti differed from all other species mainly along PC3 indicating more elongated cheeks. Phenogram based on Procrustes shape distances will be compared to molecular phylogenetic trees and morphometric data will be mapped onto phylogenetic trees in order to illustrate the mode of phenotypic diversification of Trematomus during evolution. Refugia and Ecosystem Tolerance in the Southern Ocean |
author2 |
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège |
format |
Conference Object |
author |
Frederich, Bruno Heindler, Franz M. Dettai, Agnès Christiansen, Henrik Van De Putte, Anton Lepoint, Gilles |
author_facet |
Frederich, Bruno Heindler, Franz M. Dettai, Agnès Christiansen, Henrik Van De Putte, Anton Lepoint, Gilles |
author_sort |
Frederich, Bruno |
title |
Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei) |
title_short |
Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei) |
title_full |
Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei) |
title_fullStr |
Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei) |
title_full_unstemmed |
Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei) |
title_sort |
head shape disparity of the cod icefishes trematominae (notothenioidei, teleostei) |
publishDate |
2016 |
url |
https://orbi.uliege.be/handle/2268/204554 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Zoology 2016, Antwerp, Belgium [BE], du 15 décembre 2016 au 17 décembre 2016 |
op_relation |
https://orbi.uliege.be/handle/2268/204554 info:hdl:2268/204554 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
_version_ |
1796946619936014336 |