Population dynamics of the krill Meganyctiphanes norvegica (M Sars, 1857) (Crustacea: Euphausiacea) in the Ligurian Sea (NW Mediterranean sea). Size structure, growth and mortality modelling - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Plankton Research Année : 1996

Population dynamics of the krill Meganyctiphanes norvegica (M Sars, 1857) (Crustacea: Euphausiacea) in the Ligurian Sea (NW Mediterranean sea). Size structure, growth and mortality modelling

Jp Labat
  • Fonction : Auteur

Résumé

The seasonal abundance, population structure and dynamics of the euphausiid Meganyctiphanes norvegica were studied from samples taken year round in the NW Mediterranean Sea Length-frequency distributions were generally bimodal: the first mode was interpreted as the born-in-the-year cohort (0+) and the second as a combination of the older age classes (1+). To describe growth, a bilinear function provides the best fit. A growth rate of 0.052 mm day(-1) (1.56 mm month(-1)) was calculated for the first part of the growth function and 0.0034 mm day(-1) for the second part. A negative exponential mortality function was fitted, giving a mortality rate of 0.0034 day(-1) (1.25 year(-1)). A numerical simulation of the size structure of the Ligurian population was performed and the validity of the model was checked using a multifactorial analysis. The demographic characteristics of the Ligurian population were compared to those of other areas and were interpreted as a functional adaptation of M.norvegica to the southern part of the geographical distribution of the species.

Domaines

Océanographie

Dates et versions

hal-03479841 , version 1 (14-12-2021)

Identifiants

Citer

Jp Labat, J Cuzinroudy. Population dynamics of the krill Meganyctiphanes norvegica (M Sars, 1857) (Crustacea: Euphausiacea) in the Ligurian Sea (NW Mediterranean sea). Size structure, growth and mortality modelling. Journal of Plankton Research, 1996, 18 (12), pp.2295-2312. ⟨10.1093/plankt/18.12.2295⟩. ⟨hal-03479841⟩
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