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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 12 | PAGES 2295-2312 | 1996
© Oxford University Press

research-article

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

J.Ph. Labat and J. Cuzin-Roudy

Laboratoire d'Océanographie Biochimique et Ecologie, Université P et M. Curie (Paris 6) - INSU-CNRS Observatoire Océanologique 06230-Villefranche/lmer, France

Received on September 28, 1995; accepted on July 19, 1996 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 0.052mm day–1 (1.56mm 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 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.


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