Lionel Pawlowski
IFREMER
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Publication
Featured researches published by Lionel Pawlowski.
Journal of Fish Biology | 2017
J. Rault; H. Le Bris; Marianne Robert; Lionel Pawlowski; M. Denamiel; Dorothée Kopp
The characterization and quantification of diets of nine commercially important Celtic Sea fish species (black-bellied angler Lophius budegassa, blue whiting Micromesistius poutassou, Atlantic cod Gadus morhua, haddock Melanogrammus aeglefinus, European hake Merluccius merluccius, megrim Lepidorhombus whiffiagonis, European plaice Pleuronectes platessa, common sole Solea solea and whiting Merlangius merlangus) was undertaken November 2014 and November 2015 to gain a better understanding of fish feeding strategies, prey preferences, competition for resources and, more generally, increases knowledge of marine ecosystem functioning. Prey were classified into 39 taxonomic groups. A feeding overlap index and multivariate analyses were used to classify the fishes into four main trophic groups where interspecific competition for resources may be important: piscivorous species, omnivorous species, planktivorous species and invertebrate benthic feeders. Ontogenetic changes in diet were also considered for L. budegassa, G. morhua, M. aeglefinus, M. merluccius and M. merlangus through partitioning into size classes. This revealed an important shift in the diet of M. merluccius from omnivory to piscivory, whereas M. aeglefinus exhibited no significant ontogenetic change in diet, remaining an invertebrate benthic feeder. Feeding strategies of these species were also investigated using the Shannon niche-breadth index and other descriptors, such as the total number of taxonomic groups of prey and the mean number of prey in gut contents.
PLOS ONE | 2018
Ernesto Jardim; Margit Eero; Alexandra Silva; Clara Ulrich; Lionel Pawlowski; Steven J. Holmes; Leire Ibaibarriaga; José A. A. De Oliveira; Isabel Riveiro; Nekane Alzorriz; Leire Citores; Finlay Scott; Andrés Uriarte; Pablo Carrera; Erwan Duhamel; Iago Mosqueira
This paper describes a methodology that combines meta-population theory and stock assessment models to gain insights about spatial heterogeneity of the meta-population in an operational time frame. The methodology was tested with stochastic simulations for different degrees of connectivity between sub-populations and applied to two case studies, North Sea cod (Gadus morua) and Northeast Atlantic sardine (Sardina pilchardus). Considering that the biological components of a population can be partitioned into discrete spatial units, we extended this idea into a property of additivity of sub-population abundances. If the additivity results hold true for putative sub-populations, then assessment results based on sub-populations will provide information to develop and monitor the implementation of finer scale/local management. The simulation study confirmed that when sub-populations are independent and not too heterogeneous with regards to productivity, the sum of stock assessment model estimates of sub-populations’ SSB is similar to the SSB estimates of the meta-population. It also showed that a strong diffusion process can be detected and that the stronger the connection between SSB and recruitment, the better the diffusion process will be detected. On the other hand it showed that weak to moderate diffusion processes are not easy to identify and large differences between sub-populations productivities may be confounded with weak diffusion processes. The application to North Sea cod and Atlantic sardine exemplified how much insight can be gained. In both cases the results obtained were sufficiently robust to support the regional analysis.
Ices Journal of Marine Science | 2010
Pascal Lorance; Lionel Pawlowski; Verena M. Trenkel
Aquatic Living Resources | 2009
Lionel Pawlowski; Pascal Lorance
Canadian Journal of Fisheries and Aquatic Sciences | 2016
Andrés Uriarte; Leire Ibaibarriaga; Lionel Pawlowski; Jacques Massé; Pierre Petitgas; Maria José Santos; Dankert W. Skagen
Archive | 2011
Alain Biseau; Robert Bellail; Michel Bertignac; Gerard Biais; Jean-Louis Bigot; Ludovic Bouche; Jerome Bourjea; Anthony Caro; Marie-Noelle De Casamajor; Nathalie Caill-Milly; Mickael Drogou; Erwan Duhamel; Spyros Fifas; Eric Foucher; Jean-Marc Fromentin; Angelique Jadaud; Luis Lampert; Martial Laurans; Muriel Lissardy; Pascal Lorance; Jean-Claude Mahe; Kelig Mahe; Jacques Massé; Gilles Morandeau; Lionel Pawlowski; Francois Poisson; Lionel Reynal; David Roos; Yves Verin; Joel Vigneau
Archive | 2015
Alexandra Silva; Ana Moreno; Isabel Riveiro; Begoña Santos; Cristina Pita; João Garcia Rodrigues; Sebastián Villasante; Lionel Pawlowski; Erwan Duhamel
international conference on evolvable systems | 2009
Pascal Lorance; Lionel Pawlowski; Verena M. Trenkel
Journal of Applied Ichthyology | 2018
Dorothée Kopp; Marianne Robert; Lionel Pawlowski
Food Webs | 2017
Pierre Issac; Marianne Robert; Hervé Le Bris; Jonathan Rault; Lionel Pawlowski; Dorothée Kopp