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Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei)
Frederich, Bruno; Heindler, Franz M.; Dettai, Agnès et al.
2016Zoology 2016
 

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Keywords :
Disparity; morphospace; geometric morphometric; icefishes; cephalic region; shape variation; Southern Ocean
Abstract :
[en] 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.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
Disciplines :
Zoology
Author, co-author :
Frederich, Bruno  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Heindler, Franz M.
Dettai, Agnès
Christiansen, Henrik
Van De Putte, Anton
Lepoint, Gilles  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Language :
English
Title :
Head shape disparity of the cod icefishes Trematominae (Notothenioidei, Teleostei)
Publication date :
16 December 2016
Number of pages :
A0
Event name :
Zoology 2016
Event organizer :
Royal Belgian Zoological Society (RBZS)
Royal Dutch Zoological Society (KNDV)
Event place :
Antwerp, Belgium
Event date :
du 15 décembre 2016 au 17 décembre 2016
Audience :
International
Name of the research project :
Refugia and Ecosystem Tolerance in the Southern Ocean
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
Available on ORBi :
since 20 December 2016

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