Consulta: creatorFacets:"Timmerman, Charles-andre"
Registros recuperados: 9
Data/hora: 11/06/2024 08:17:43

Alimentation du merlan en Manche
Provedor de dados: 5
Autores: Cresson, Pierre; Timmerman, Charles-andre; Denamiel, Margaux; Millet, Lucie; Marchal, Paul.
This document summaries the major findings about the diet of whiting Merlangius merlangus in the English Channel, in the framework of the VARITROPH project. Whiting diet is based on several main preys, with an ontogenic variation. Individuals lower than 30 cm mostly fed on crustaceans, while diet of larger individuals is based on cephalopods and fishes. As a result, trophic level show 2 phases, one increasing at the early life stages, and a constant trophic level for individuals larger than 30 cm.
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00675/78717/80903.pdf

Bilan des essais et optimisation du suivi mutualisé « réseaux trophiques et contaminants » sur les campagnes halieutiques DCF 2014- 2015
Provedor de dados: 5
Autores: Mialet, Benoit; Banaru, Daniela; Baudrier, Jerome; Bustamante, Paco; Chekri, Rachida; Cresson, Pierre; Harmelin, Mireille; Le Loc'H, François; Mauffret, Aourell; Marchand, Philippe; Petit, Laetitia; Prieur, Solene; Saibi-yedjer, Lynda; Serre, Sandrine; Spitz, Jerome; Timmerman, Charles-andre; Vouriot, Pauline; Wessel, Nathalie.
Ce document s’adresse à un public large, familier ou non avec les problématiques couvertes par la Directive Cadre “Stratégie pour le Milieu Marin” (DCSMM). Ce public inclut donc le personnel intervenant sur la mise en oeuvre de la DCSMM, les scientifiques, et toute personne concernée par la surveillance de l’état de santé du milieu marin. L’objectif du document est de valoriser les travaux menés lors des essais du Programme de Surveillance de la DCSMM. Ces essais ont consisté à tester des protocoles visant à utiliser les campagnes océanographiques bentho-démersales et pélagiques existantes pour collecter les données indispensables à la construction et au renseignement d’indicateurs du Bon État Écologique. Cette collecte de données implique la participation...
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00373/48447/48712.pdf

Alimentation du maquereau en Manche
Provedor de dados: 5
Autores: Cresson, Pierre; Timmerman, Charles-andre; Cordier, Remy; Couvreur, Clemence; Denamiel, Margaux; Engler, Alexandra; Lebon, Fabien; Lepretre, Marie-anais; Marchal, Paul.
This document summaries major information about the diet of mackerel Scomber scombrus in the English Channel, collected during the VARITROPH project. Mackerel consume quite exclusively copepods, with low effect of size on both diet and trophic level.
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00675/78716/80902.pdf

Alimentation de la sole et de la plie en Manche
Provedor de dados: 5
Autores: Cresson, Pierre; Timmerman, Charles-andre; Couvreur, Clemence; Denamiel, Margaux; Lepretre, Marie-anais; Marchal, Paul.
This document summaries major results about the diet of sole Solea solea and plaice Pleuronectes platessa in the English Channel, collected in the framework of the VARITROPH project. Both species have a similar diet, based on crustaceans, but plaice exhibit a larger diversity of secundary species (bivalves, annelids and echinoderms) than sole (annelids only). Diversity of the preys for plaice is explained by differences between size classes. Diet of small individuals is less diverse than the diet of large individuals. Trophic similarity between sole and plaice is also exhibited when comparing ontogenic changes of trophic levels, that are pretty similar for both species, and consistent with a diet based on small invertebrates.
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00675/78718/80904.pdf

Variations saisonnières et ontogéniques des interactions trophiques : Etude des poissons de Manche – mer du Nord à plusieurs niveaux d’organisation
Provedor de dados: 5
Autores: Timmerman, Charles-andre.
Les interactions trophiques sont à la base de nombreux processus régissant la structure et le fonctionnement des écosystèmes. Cependant, de nombreuses sources de variations sont mal connues comme les variations saisonnières et ontogéniques. Ces variations ont été appréhendées à plusieurs niveaux d’organisation, l’assemblage, l’espèce et l’individu dans les écosystèmes de Manche orientale (MO) et de la baie sud de la mer du Nord (BSMDN). Ces variations ont été tout d’abord étudiées en analysant les isotopes stables du carbone (13C) et de l’azote (15N), qui fournissent des informations sur l’utilisation des ressources et de l’habitat dans un espace à deux dimensions. Ces analyses ont été réalisées sur plusieurs tissus en raison de leurs différents temps...
Tipo: Text
Palavras-chave: Isotopes stables; Niveaux d’organisation; Niche; Compétition; Couplage bentho-pélagique.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00676/78816/81060.pdf

Primary production and depth drive different trophic structure and functioning of fish assemblages in French marine ecosystems
Provedor de dados: 5
Autores: Cresson, Pierre; Chouvelon, Tiphaine; Bustamante, Paco; Bănaru, Daniela; Baudrier, Jerome; Le Loch, Francois; Mauffret, Aourell; Mialet, Benoit; Spitz, Jérome; Wessel, Nathalie; Briand, Marine; Denamiel, Margaux; Doray, Mathieu; Guillou, Gaël; Jadaud, Angelique; Lazard, Coline; Noûs, Camille; Prieur, Solène; Rouquette, Manuel; Saraux, Claire; Serre, Sandrine; Timmerman, Charles-andre; Verin, Yves; Harmelin-vivien, Mireille.
Investigating the drivers of fish assemblage trophic structure is a critical question, in order to better understand ecosystem functioning, predict the effects of perturbations and implement integrated management of exploited marine ecosystems. Ecosystemic surveys enabled the determination of the trophic structure of the fish assemblages in three French marine ecosystems, namely the Eastern English Channel, the Bay of Biscay and the Gulf of Lions, through the simultaneous collection of qualitative (stable isotopes and energy content) and quantitative (biomass) data. In the Bay of Biscay and in the Gulf of Lions, pelagic primary production supported at least 80% of the fish biomass production, and explained the dominance of pelagic species, but with...
Tipo: Text
Palavras-chave: Fish community; Trophodynamics; Food webs; Benthic-pelagic coupling.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74120/73562.pdf

Underestimation of chemical contamination in marine fish muscle tissue can be reduced by considering variable wet:dry weight ratios
Provedor de dados: 5
Autores: Cresson, Pierre; Travers-trolet, Morgane; Rouquette, Manuel; Timmerman, Charles-andre; Giraldo, Carolina; Lefebvre, Sebastien; Ernande, Bruno.
Whether considered as a risk for human health or as ecological tracers, contaminants' concentrations measured in fish muscles are commonly expressed relative to wet or dry mass. Comparison of results required conversion factors (CF) but accurate values are scarce and case-specific. The present paper is aimed at investigating errors linked with the use of the theoretical value. Muscles dry and wet masses were measured in 15 fish species to determine the actual CF. Most CF were lower than the theoretical wet:dry ratio of 5 classically used, with variations at individual and species level. Muscle lipid content (inferred by C/N ratios) was a crucial factor explaining discrepancies, claiming for caution when working with lipid-rich species. The observed...
Tipo: Text
Palavras-chave: Wet:dry ratio; Conversion factor; Contaminant concentration; Marine fish; Percentage of humidity.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00396/50736/51456.pdf

Suivi du plancton gélatineux et des communautés zooplanctoniques associées dans le Port de Dunkerque. Année 2014
Provedor de dados: 5
Autores: Bastian, Thomas; Delegrange, Alice; Antajan, Elvire; Cornille, Vincent; Cordier, Remy; Mestre, Julie; Senaffe, Axel; Timmerman, Charles-andre; Vincent, Dorothée.
Tipo: Text
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00410/52123/52834.pdf

Seasonal and ontogenetic variation of whiting diet in the Eastern English Channel and the Southern North Sea
Provedor de dados: 5
Autores: Timmerman, Charles-andre; Marchal, Paul; Denamiel, Margaux; Couvreur, Clemence; Cresson, Pierre.
An accurate description of trophic interactions is crucial to understand ecosystem functioning and sustainably manage marine ecosystems exploitation. Carbon and nitrogen stable isotopes were coupled with stomach content analyses to investigate whiting (Merlangius merlangus, Linnaeus, 1758) feeding behavior in the Eastern English Channel and Southern North Sea. Whiting juveniles and adults were sampled in autumn and winter to investigate both ontogenetic and seasonal changes. In addition, queen scallops (Aequipecten opercularis) samples were collected along with fish to be used as isotopic benthic baseline. Results indicated an ontogenetic diet change from crustaceans to fish and cephalopods. In autumn, δ15N values generally increased with fish size while...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00651/76359/77350.pdf