Size-effect, asymmetry, and small-scale spatial variation in otolith shape of juvenile sole in the Southern North Sea

Type Article
Date 2019-11
Language English
Author(s) Delerue-Ricard SophieORCID1, 2, Hanna Stynen1, Barbut Léo1, 3, Morat Fabien4, 5, Mahe KeligORCID6, Hablützel Pascal I.1, Hostens Kris2, Volckaert Filip1
Affiliation(s) 1 : Laboratory of Biodiversity and Evolutionary Genomics (LBEG), KU Leuven, Charles Deberiotstraat 32, Box 2439, 3000 Louvain, Belgium
2 : Institute for Agricultural and Fisheries Research, Ankerstraat 1, 8400 Ostend, Belgium
3 : Operational Directorate Natural Environment (OD Nature), Royal Belgian Institute of Natural Sciences (RBINS), Gulledelle 100, 1200 Brussels, Belgium
4 : PSL Research University: EPHE-UPVD-CNRS, USR3278 CRIOBE, 66860 Perpignan, France
5 : Laboratoire d’Excellence «CORAIL», BP 1013 Papetoai, 98729 Moore´a, French Polynesia
6 : Ifremer, Fisheries Laboratory, Sclerochronology Centre, 150 quai Gambetta, BP 699, 62321 Boulogne, France
Meeting NORTH SEA OPEN SCIENCE CONFERENCE
Source Hydrobiologia (0018-8158) (Springer), 2019-11 , Vol. 845 , N. 1 , P. 95-108
DOI 10.1007/s10750-018-3736-3
WOS© Times Cited 2
Keyword(s) Early-life stages, Fourier coefficients, Nursery ground, Otolith shape, Small-scale spatial structure
Abstract

While otolith shape analysis can provide a valuable tool for discriminating between fish populations, factors which may influence otolith shape, such as the effect of size, directional asymmetry in growth, and local environmental conditions, are often unknown. Here, we analyzed differences in otolith shape across three size classes of age-0 common sole Solea solea L. from nursery grounds off the Belgian coast and in the Wadden Sea. Across size classes, form-factor decreased and roundness remained consistently high in both nursery grounds, while ellipticity increased in the Belgian nursery. Directional asymmetry between left and right otoliths measured by Fourier coefficients accounted for 0.96 and 7.2% of the variance when comparing otoliths overall, and for each size class, respectively. Within the Belgian nursery, results were consistent across sampling years and locations. In addition, otolith shape was marginally different between nursery grounds, but highly variable within nursery grounds. A small divergent group, which seems partly related to

fish size, was noted at both spatial and temporal scales. Based on these results and before embarking on a study of population structure using otolith shape in age-0 common sole, we recommend testing for directional asymmetry and fish size effects across the entire region of interest.

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Delerue-Ricard Sophie, Hanna Stynen, Barbut Léo, Morat Fabien, Mahe Kelig, Hablützel Pascal I., Hostens Kris, Volckaert Filip (2019). Size-effect, asymmetry, and small-scale spatial variation in otolith shape of juvenile sole in the Southern North Sea. Hydrobiologia, 845(1), 95-108. Publisher's official version : https://doi.org/10.1007/s10750-018-3736-3 , Open Access version : https://archimer.ifremer.fr/doc/00453/56476/