Consulta: creatorFacets:"Dubroca, Laurent"
Registros recuperados: 19
Data/hora: 11/06/2024 09:57:29

Sample collection protocol for the extraction of female gonads in the megrim (Lepidorhombus spp.) for maturity staging through histology
Provedor de dados: 5
Autores: Sauger, Carine; Quinquis, Jerome; Dubroca, Laurent; Parrad, Sophie; Kellner, Kristell; Heude-berthelin, Clothilde.
This protocol was established during project MATO (MATurité Objective des poissons par l’histologie quantitative) for the evaluation of sexual maturity of exploited stock species, as well as to harmonize the sampling process of gonad extraction before the mounting between slide and slip of the gonad sections. This document follows the work of different workshops that aimed to improve the compilation of data on sexual maturity. The WKMATCH (WorKshop for MATurity staging CHairs, 2012) defined a universal evaluation grid for sexual maturity staging of different species. During this workshop, two main recommendations were made, underlining the need to improve and complete the knowledge on sexual maturity, as well as to harmonize the practices used to determine...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00595/70724/69144.pdf

Eating up the world's food web and the human trophic level
Provedor de dados: 5
Autores: Bonhommeau, Sylvain; Dubroca, Laurent; Le Pape, Olivier; Barde, Julien; Kaplan, David; Chassot, Emmanuel; Nieblas, Anne-elise.
Trophic levels are critical for synthesizing species' diets, depicting energy pathways, understanding food web dynamics and ecosystem functioning, and monitoring ecosystem health. Specifically, trophic levels describe the position of species in a food web, from primary producers to apex predators (range, 1-5). Small differences in trophic level can reflect large differences in diet. Although trophic levels are among the most basic information collected for animals in ecosystems, a human trophic level (HTL) has never been defined. Here, we find a global HTL of 2.21, i.e., the trophic level of anchoveta. This value has increased with time, consistent with the global trend toward diets higher in meat. National HTLs ranging between 2.04 and 2.57 reflect a...
Tipo: Text
Palavras-chave: Human ecology; Nutrition transition; Trophic ecology.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00171/28190/26609.pdf

Evaluation des mesures de gestion mises en place sur la pêcherie de sole du golfe de Gascogne depuis 2015 et analyse de la pertinence de ce cadre de gestion en vue de la campagne de pêche 2018
Provedor de dados: 5
Autores: Biseau, Alain; Dubroca, Laurent; Lissardy, Muriel.
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00396/50713/79178.pdf

Captures et rejets des métiers de pêche français. Résultats des observations à bord des navires de pêche professionnelle en 2016
Provedor de dados: 5
Autores: Cornou, Anne-sophie; Goascoz, Nicolas; Scavinner, Marion; Chassanite, Aurore; Dubroca, Laurent; Rochet, Marie-joelle.
Ce document est une synthèse des informations collectées en 2016 à bord des navires de pêche professionnelle dans le cadre de l'action ObsMer. Cette action vise à observer in situ l’activité de pêche et l'ensemble de la capture, particulièrement la partie non retenue, en identifiant les espèces capturées, les tonnages par espèce et en prenant des mesures de tailles. Ce travail s'inscrit dans le cadre d'un partenariat entre le Comite National des Pêches Maritimes et des Élevages Marins (CNPMEM), la Direction des Pêches Maritimes et de l'Aquaculture (DPMA) du Ministère de l’Agriculture et de l'alimentation, et l'Ifremer.
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00418/52945/53885.pdf

A macroscopic and stereological imaging dataset of Pleuronectes platessa ovaries
Provedor de dados: 5
Autores: Sauger, Carine; Quinquis, Jerome; Kellner, Kristell; Heude-berthelin, Clothilde; Lepoittevin, Mélanie; Elie, Nicolas; Dubroca, Laurent.
The North Sea plaice, Pleuronectes platessa (Linnaeus, 1758), is a commonly studied commercial flatfish with poorly known ovarian histology. The following dataset is a collection of female plaice gonad images and their corresponding histological slides, collected during a complete season of the plaice’s reproduction cycle. Stereology was used to determine the percentage of different structures found throughout the ovaries. Inter-agent calibrations were accomplished in order to harmonize the stereological readings, and were based on a comprehensive reading protocol and histological lexicon that were specifically written for the plaice’s ovaries. The distribution and homogeneity of the different cell types found throughout the ovaries were also evaluated....
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00631/74342/73994.pdf

Long term survey of the fish community and associated benthic fauna of the Seine estuary nursery grounds
Provedor de dados: 5
Autores: Cariou, Thibault; Dubroca, Laurent; Vogel, Camille.
Estuaries are crucial ecosystems where human activities deeply affect numerous ecological functions. Here we present a survey dataset based on the monitoring of fish nursery grounds of the Seine estuary and eastern bay of Seine collected once a year using a beam trawl during three distinct periods (1995-2002, 2008–2010 and 2017–2019). The surveys happen at the start of autumn in order to maximize the catchability of juvenile fish. The beam trawl mainly targets benthic and demersal species on a study area that extends over 600 square kilometers. The dataset includes abundance and densities of 161 species for 634 hauls performed around 40 stations each year. These data can be used by fishery scientists and ecologists motivated by early life stages of...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75277/75542.pdf

An objective take on defining sexual maturity in the plaice, Pleuronectes platessa (Linné, 1758)
Provedor de dados: 5
Autores: Sauger, Carine; Quinquis, Jerome; Lepoittevin, Mélanie; Heude-berthelin, Clothilde; Kellner, Kristell; Elie, Nicolas; Dubroca, Laurent.
The European plaice (Pleuronectes platessa) is a commercial species with stock management advice given through the estimation of fish length at maturity (L50) (Mahé et al., 2007). Estimating the maturity of fish species has been worked on by the International Council for the Exploration of the Sea (ICES) that wants to harmonize the definitions, terminologies and practices used to determine the different maturity phases. Project MATO (MATurité Objective des poissons par l’histologie quantitative) will, among other things, bring knowledge on the ovarian histology of the plaice in order to correlate histological maturity with macroscopic parameters like the size color and texture of the ovaries. With this knowledge, the aim of this study is to set up a...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00609/72093/70818.pdf

An Ecological Time Series of Pacific Oyster (C. gigas) Growth and Survival: data curation and analysis of 24 years of monitoring along the French coast
Provedor de dados: 5
Autores: Normand, Julien; Dubroca, Laurent; Fleury, Elodie.
As global change becomes a major concern, the need to contextualize discrete observations to highlight long-term evolutions also becomes more relevant. In response to this challenge, Marine Historical Ecology (MHE) has recently emerged as a new discipline within the marine sciences, dedicated to studying the relationship between long-term evolution of marine ecosystems and temporal variations of external predictors such as meteorological parameters, or descriptors of human activities. In recent years, therefore, considerable effort has been devoted to study long-term time series on fisheries and environmental data. This approach has increased our knowledge about natural variability and functioning of marine environments and has helped us to characterize...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00588/70003/67917.pdf

Captures et rejets des métiers de pêche français. Résultats des observations à bord des navires de pêche professionnelle en 2019. Obsmer
Provedor de dados: 5
Autores: Cornou, Anne Sophie; Scavinner, Marion; Sagan, Jonathan; Cloatre, Thomas; Dubroca, Laurent; Billet, Norbert.
This document is a summary of the information collected in 2019 on board professional fishing vessels in the framework of the ObsMer action. This action aims to observe in situ the fishing activity and the entire catch, particularly the part not retained, by identifying the species caught, the tonnages by species and by taking size measurements. This work is part of a partnership between the Fisheries and Aquaculture Directorate (DPMA) of the Ministry of the Sea, the French National Fisheries Committee (CNPMEM) and Ifremer.
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00680/79198/81709.pdf

Captures et rejets des métiers de pêche français. Résultats des observations à bord des navires de pêche professionnelle en 2017. Obsmer
Provedor de dados: 5
Autores: Cornou, Anne Sophie; Goascoz, Nicolas; Scavinner, Marion; Prioul, Francois; Sabbio, Andrea; Dubroca, Laurent; Renaud, Florent; Rochet, Marie-joelle.
Ce document est une synthèse des informations collectées en 2017 à bord des navires de pêche professionnelle dans le cadre de l'action ObsMer. Cette action vise à observer in situ l’activité de pêche et l'ensemble de la capture, particulièrement la partie non retenue, en identifiant les espèces capturées, les tonnages par espèce et en prenant des mesures de tailles. Ce travail s'inscrit dans le cadre d'un partenariat entre le Comite National des Pêches Maritimes et des Élevages Marins (CNPMEM), la Direction des Pêches Maritimes et de l'Aquaculture (DPMA) du Ministère de l’Agriculture et de l'Alimentation, et l'Ifremer.
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00461/57314/59410.pdf

Approche géostatistique de la distribution de poissons plats dans la nourricerie de l'estuaire de Seine
Provedor de dados: 5
Autores: Cariou, Thibault; Dubroca, Laurent; Vogel, Camille; Bez, Nicolas.
L’estuaire de Seine est un habitat essentiel pour les espèces halieutiques emblématiques de la façade Manche-Mer du Nord en sa qualité de nourricerie. Cet estuaire a connu de profondes modifications morphologiques au cours des 30 dernières années des suites d’une forte anthropisation de ces rives. Cet habitat estuarien-côtier, comptant parmi les habitats les plus productifs du milieu marin, joue un rôle central dans le renouvellement des stocks de pêche, en favorisant la croissance et la survie des juvéniles des espèces dites « nourricerie-dépendantes ». Malgré une couverture temporelle très inégale dans les campagnes depuis 30 ans, les suivis des communautés de juvéniles et les observations biotiques (communautés benthiques), abiotiques (hydrodynamisme,...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00512/62355/66632.pdf

Saisine 16-9877: "Répartition des captures des différentes espèces de rougets selon les segments de flotte du golfe du Lion et l'Impact d’une augmentation de l’effort d’échantillonnage sur la précision des estimations de débarquements de diverses espèces"
Provedor de dados: 5
Autores: Demaneche, Sebastien; Jadaud, Angelique; Dubroca, Laurent; Cornou, Anne-sophie; Weiss, Jerome; Vigneau, Joel; Biseau, Alain.
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00355/46666/79667.pdf

Captures et rejets des métiers de pêche français. Résultats des observations à bord des navires de pêche professionnelle en 2018. Obsmer
Provedor de dados: 5
Autores: Gauduchon, Thibault; Cornou, Anne Sophie; Scavinner, Marion; Goascoz, Nicolas; Dubroca, Laurent; Billet, Norbert.
Ce document est une synthèse des informations collectées en 2018 à bord des navires de pêche professionnelle dans le cadre de l'action ObsMer. Cette action vise à observer in situ l’activité de pêche et l'ensemble de la capture, particulièrement la partie non retenue, en identifiant les espèces capturées, les tonnages par espèce et en prenant des mesures de tailles. Ce travail s'inscrit dans le cadre d'un partenariat entre le Comite National des Pêches Maritimes et des Élevages Marins (CNPMEM), la Direction des Pêches Maritimes et de l'Aquaculture (DPMA) du Ministère de l’Agriculture et de l'Alimentation, et l'Ifremer.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00619/73122/72281.pdf

Protocole de détermination des structures histologiques d’ovaires et de l’ovogenèse de la plie, Pleuronectes platessa (Linné, 1758)
Provedor de dados: 5
Autores: Sauger, Carine; Quinquis, Jerome; Dubroca, Laurent; Kellner, Kristell; Lepoittevin, Mélanie; Heude Berthelin, Clothilde; Elie, Nicolas.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00501/61235/64813.pdf

"M2B" package in R: Deriving multiple variables from movement data to predict behavioural states with random forests
Provedor de dados: 5
Autores: Thiebault, Andrea; Dubroca, Laurent; Mullers, Ralf H. E.; Tremblay, Yann; Pistorius, Pierre A.
1. The behaviour of individuals affect their distributions and is therefore fundamental in determining ecological patterns. While, the direct observation of behaviour is often limited due to logistical constraints, collection of movement data has been greatly facilitated through the development of bio-logging. Movement data obtained through tracking instrumentation may potentially constitute a relevant proxy to infer behaviour. 2. To infer behaviour from movement data is a key focus within the "movement ecology" discipline. Statistical learning constitutes a number of methods that can be used to assess the link between given variables from a fully informed training dataset and then predict the values on a non-informed variable. We chose the random forest...
Tipo: Text
Palavras-chave: Cape gannet; Fisheries; GPS; Local enhancement; Machine learning; Onboard observers; Social interactions; Video cameras.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00445/55683/57354.pdf

Marine diatoms sustain growth of bivalves in a Mediterranean lagoon
Provedor de dados: 5
Autores: Pernet, Fabrice; Malet, Nathalie; Pastoureaud, Annie; Vaquer, Andre; Quere, Claudie; Dubroca, Laurent.
Carbon stable isotopes and fatty acids were measured in the suspended particulate organic matter (POM) of the Thau lagoon to study its qualitative temporal changes in relation to environmental factors and to identify the food sources of bivalves over a one-yr-cycle in relation to their growth. Reciprocally, the impact of shellfish farming on POM was also studied. Oysters and mussels were sampled and measured for biometry, stable isotopes and fatty acid composition. Water samples were collected at two sites, both inside and outside of the shellfish farming area, to determine concentrations in POM, chlorophyll a (Chl a) and stable isotopes. Carbon isotopes and fatty acids in bivalves reflected seasonal changes in food sources, which varied consistently with...
Tipo: Text
Palavras-chave: Aquaculture; Bivalve; Competition; Feeding ecology; Growth; Trophic markers.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00075/18575/16177.pdf

Defining Mediterranean and Black Sea Biogeochemical Subprovinces and Synthetic Ocean Indicators Using Mesoscale Oceanographic Features
Provedor de dados: 5
Autores: Nieblas, Anne-elise; Drushka, Kyla; Reygondeau, Gabriel; Rossi, Vincent; Demarcq, Herve; Dubroca, Laurent; Bonhommeau, Sylvain.
The Mediterranean and Black Seas are semi-enclosed basins characterized by high environmental variability and growing anthropogenic pressure. This has led to an increasing need for a bioregionalization of the oceanic environment at local and regional scales that can be used for managerial applications as a geographical reference. We aim to identify biogeochemical subprovinces within this domain, and develop synthetic indices of the key oceanographic dynamics of each subprovince to quantify baselines from which to assess variability and change. To do this, we compile a data set of 101 months (2002-2010) of a variety of both "classical'' (i.e., sea surface temperature, surface chlorophyll-a, and bathymetry) and "mesoscale'' (i.e., eddy kinetic energy,...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00239/34995/33536.pdf

Spatio-Temporal Dynamics of Exploited Groundfish Species Assemblages Faced to Environmental and Fishing Forcings: Insights from the Mauritanian Exclusive Economic Zone
Provedor de dados: 5
Autores: Kide, Saikou Oumar; Mante, Claude; Dubroca, Laurent; Demarcq, Herve; Merigot, Bastien.
Environmental changes and human activities can have strong impacts on biodiversity and ecosystem functioning. This study investigates how, from a quantitative point of view, simultaneously both environmental and anthropogenic factors affect species composition and abundance of exploited groundfish assemblages (i.e. target and non-target species) at large spatio-temporal scales. We aim to investigate (1) the spatial and annual stability of groundfish assemblages, (2) relationships between these assemblages and structuring factors in order to better explain the dynamic of the assemblages’ structure. The Mauritanian Exclusive Economic Zone (MEEZ) is of particular interest as it embeds a productive ecosystem due to upwelling, producing abundant and diverse...
Tipo: Text
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00288/39945/38493.pdf

Impacts of climatic anomalies on provisioning strategies of a Southern Ocean predator
Provedor de dados: 5
Autores: Lea, Mary-anne; Guinet, Christophe; Cherel, Yves; Duhamel, Guy; Dubroca, Laurent; Pruvost, Patrice; Hindell, Mark.
The large temporal and spatial variability in marine productivity encountered by marine predators may negatively influence breeding success. The Antarctic fur seal Arctocephalus gazella (AFS), a marine predator in the Southern Ocean (SO) ecosystem with a circumpolar distribution, exhibits a short, 4 mo lactation coinciding with increased summer marine productivity. The diet of AFS, and the distance to significant and productive oceanographic features, such as the Antarctic Polar Frontal Zone (PFZ), varies considerably between populations. We studied the foraging activity, foraging efficiency and the pup provisioning strategies of lactating AFS at a key breeding site in the southern Indian Ocean, the Kerguelen Archipelago. Foraging parameters were examined...
Tipo: Text
Palavras-chave: Antarctic fur seal; Polar front; Pinniped; ENSO; Foraging; Growth; Diving; Seabird; Myctophid; Maternal care.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00247/35847/34356.pdf