Aquat. Living Resour.
Volume 25, Number 1, January-March 2012
|Page(s)||27 - 39|
|Published online||02 January 2012|
Discrimination of red mullet populations (Teleostean, Mullidae) along multi-spatial and ontogenetic scales within the Mediterranean basin on the basis of otolith shape analysis*
Centre d’Océanologie de Marseille, Université de la
Méditerranée, UMR CNRS 6540 DIMAR, Campus universitaire de
Luminy, Case 901
2 Université de la Nouvelle-Calédonie, Laboratoire LIVE, 145 avenue James Cook, BP R4, 98851 Nouméa Cedex New Caledonia
3 Centre d’Océanologie de Marseille, Université de la Méditerranée, UMR CNRS 6117 LMGEM, Campus universitaire de Luminy, Case 901 13288 Marseille Cedex 09 France
4 University Ovidius of Constanta, 124 bd Mamaia 900527 Constanta Romania
5 University of the AegeanDepartment of Marine Sciences, University Hill, 81100 Mytilini Lesvos Island Greece
Corresponding author: email@example.com
Received: 2 February 2011
Accepted: 11 November 2011
Otolith shape analyses were conducted on three different species of Mullidae (Mullus barbatus barbatus, M. b. ponticus and M. surmuletus). The otolith shape was described by 19 harmonics from elliptic Fourier descriptors. In a first step, their comparison through canonical discriminant analyses (CDA) was run for all fish with right otoliths, left otoliths and both otoliths pooled. The latter possibility had a higher discriminating power and allowed much more visually explicit results. This implied that the two otoliths were not similar as often claimed, and had each their specific information. In a second step, the CDA demonstrated strong spatial discrimination of local populations from various areas within the Mediterranean basin, i.e. NW Mediterranean, Aegean Sea and Black Sea, and between sites within each area. The percentage of well classified individuals of M. barbatus in predefined groups varied between 78 to 100% depending on sites, and even reached 100% for each site for M. surmuletus. These spatial patterns were most likely linked to differences in environmental conditions between areas and sites, such as effects of strong river runoffs and differences in depths and/or habitat types. In a third step, CDA also evidenced ontogenetic discriminations of mullet populations that could be linked (i) to influence of diet of fish of various sizes and (ii) to changes in physiological conditions according to the stage of development of the fish.
Key words: Otolith / Shape / analysis / Environmental influences / Fluctuating asymmetry / Mullidae / Mediterranean
Supporting information is only available in electronic form at http://www.alr-journal.org
© EDP Sciences, IFREMER, IRD 2011
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