Otolith shape as a valuable tool to evaluate the stock structure of swordfishXiphias gladiusin the Indian Ocean
| Autor: | Jerome Bourjea, Kelig Mahe, Hugues Evano, D. Muths, Tiphaine Mille |
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| Přispěvatelé: | Laboratoire Ressources halieutiques Manche Mer du nord, IFREMER Centre Manche Mer du Nord, (HMMN), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Délégation de La Réunion, Université européenne de Bretagne - European University of Brittany (UEB), MARine Biodiversity Exploitation and Conservation (UMR MARBEC), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Meteorology [SDE.MCG]Environmental Sciences/Global Changes Aquatic Science Fish measurement 01 natural sciences [SDV.EE.ECO]Life Sciences [q-bio]/Ecology environment/Ecosystems stock discrimination medicine 14. Life underwater Gladius Ecology Evolution Behavior and Systematics Stock (geology) Otolith sagittal otoliths Connectivity 010604 marine biology & hydrobiology Swordfish 04 agricultural and veterinary sciences Linear discriminant analysis connectivity Fourier descriptors morphometric markers sagittal otoliths stock discrimination Geography medicine.anatomical_structure morphometric markers connectivity Principal component analysis 040102 fisheries 0401 agriculture forestry and fisheries Fourier descriptors [SDE.BE]Environmental Sciences/Biodiversity and Ecology Jackknife resampling Cartography |
| Zdroj: | African Journal Of Marine Science (1814-232X) (Natl Inquiry Services Centre Pty Ltd), 2016, Vol. 38, N. 4, P. 457-464 African Journal of Marine Science African Journal of Marine Science, NISC, 2016, 38 (4), pp.457-464. ⟨10.2989/1814232x.2016.1224205⟩ African Journal of Marine Science; Vol 38, No 4 (2016); 457-464 |
| ISSN: | 1814-2338 1814-232X |
| Popis: | Swordfish Xiphias gladius is an oceanic-pelagic species. Its population structure in the Western Indian Ocean was studied from the shape of the sagittal otoliths of 391 individuals collected from 2009 to 2014. Normalised elliptical Fourier descriptors (EFDs) were extracted automatically using TNPC software. Principal components analysis (PCA) conducted on EFDs showed no significant effect of side (i.e. left or right otolith). Consequently, all 391 sagittal otoliths were used to identify stocks among six geographical areas: Reunion Island, Mozambique Channel, Rodrigues, South Africa, Madagascar South and Sri Lanka. To investigate the effects of sex, sampling year, sampling season, lower jaw fork length or geographical area on variations in otolith shape, redundancy analyses (RDAs) with permutation tests were conducted. The first four were non-significant (respectively, p = 0.124, p = 0.721, p = 0.197, p = 0.463), but geographical area appeared to discriminate groups significantly (p < 0.05). Furthermore, linear discriminant analysis (LDA) was performed and overall jackknife classification success reached 30%. Finally, a cluster analysis was conducted using Ward’s hierarchical algorithm, which discriminated three different groups. However, each group consisted of individual samples from all geographical areas. In conclusion, our results were unable to identify a clear geographical separation of swordfish at the Indian Ocean scale, corroborating recent genetic studies in this region.Keywords: connectivity, Fourier descriptors, morphometric markers, sagittal otoliths, stock discrimination |
| Databáze: | OpenAIRE |
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