Consulta: creatorFacets:"Loots, Christophe"
Registros recuperados: 37
Data/hora: 14/06/2024 08:38:52

Contrôles de la distribution spatiale de l'habitat de reproduction chez les populations de poissons. Approche multi-modèles appliquée à la plie et au merlan de Mer du Nord et à l'anchois du Golfe de Gascogne
Provedor de dados: 5
Autores: Loots, Christophe.
Spawning is a crucial phase of fish life cycle as it ensures the renewal of individuals in the population. The identification of factors that influence its spatial dynamic is therefore a key feature as it will affect the reproduction success of fish population. A multi-model approach has been developed in order to identify factors that control the spatial distribution of spawning adults of plaice and whiting in the North Sea and of anchovy in the Bay of Biscay. Generalised additive models have been used to relate presenceabsence of adults and their abundances to several hypotheses of control external (geographical position and environment) and internal to the population (spatial dependency, size, age structure and memory). Models were then ranked according...
Tipo: Text
Palavras-chave: Anchovy; Whiting; Plaice; Multi model approach; Hypotheses of control; Habitat; Spawning; Anchois; Merlan; Plie; Approche multi modèles; Hypothèses de contrôle; Habitat; Reproduction.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/these-7400.pdf

Surveillance Écologique et Halieutique Site de Gravelines. Novembre 2014 - Octobre 2015
Provedor de dados: 5
Autores: Antajan, Elvire; Lefebvre, Alain; Loots, Christophe; Rocroy, Mélanie; Ruellet, Thierry.
This is the 38th annual surveillance report concerning the nuclear power plant of Gravelines. Its very high power level results from six plant units located on the shore and is characterised by a cooling system with a coastal surface input and output. The production of electricity began in 1980 and reached maximum in 1986. Surveys concern monitoring of pelagic system (hydrology, microbiology, phytoplankton, and zooplankton), fish populations (larvae and eggs of Sole and Sprat) or crustaceans (shrimps), and benthic macrofauna (intertidal and subtidal). This survey deals with spatial and temporal approaches (i) study of the direct impact by comparison of the input and output seawater stations, (ii) study of medium and long term evolution of the area by...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton; Benthos; Microbiologie; Nuclear power plant; Gravelines; Network survey; Hydrology; Fisheries; Plankton; Microbiology; Benthos.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00332/44313/43879.pdf

Linking spawning ground extent to environmental factors - patterns and dispersal during the egg phase of four North Sea fishes.
Provedor de dados: 5
Autores: Hoffle, Hannes; Van Damme, Cindy J. G.; Fox, Clive; Lelievre, Stephanie; Loots, Christophe; Nash, Richard D. M.; Vaz, Sandrine; Wright, Peter J.; Munk, Peter.
Previous studies have shown that four commercially important demersal species, namely cod (Gadus morhua), haddock (Melanogrammus aeglefinus), whiting (Merlangius merlangus) and plaice (Pleuronectes platessa) spawn in distinct areas across the North Sea. Based on two comprehensive ichthyoplankton surveys in 2004 and 2009, the present study uses Generalized Additive Mixed Models (GAMMs) to delimit these spawning grounds using the distribution of recently spawned eggs, investigates their relationship to specific environmental conditions and examines egg dispersal during their development. Results indicate that presence/absence of early stage eggs is more related to temporal and topographic variables, while egg densities are closely linked with hydrography....
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00385/49641/50157.pdf

Growth of an Inshore Antarctic ﬁsh, Trematomus newnesi (Nototheniidae), off Adelie Land
Provedor de dados: 5
Autores: Mahe, Kelig; Elleboode, Romain; Loots, Christophe; Koubbi, Philippe.
Dusky rockcod, Trematomus newnesi, is a widely distributed neritic circumpolar Antarctic fish species. We conducted a study on age and growth of Trematomus newnesi in coastal waters of Adélie Land in East Antarctica. A total of 289 specimens were collected in 2003, 2005, 2006 and 2009. They consisted of 122 females, 132 males and 35 immature specimens. Total length (TL) and total weight (W) of these fish ranged from 13.5 to 25 cm and 19.7 to 174 g respectively for females and from 12 to 20.9 cm and from 24.1 to 144.1 g for males. The TL/W relationship was described by the following parameters: a=7.2.10-3 and b=3.127, showing no significant difference between sex (ANCOVA, P&lt;0.05). Fish age was estimated by counting annual growth increments on polished...
Tipo: Text
Palavras-chave: Antarctic fish; Trematomus newnesi; Otoliths; Growth; Age; Adelie land.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00333/44440/44156.pdf

Surveillance écologique et halieutique du site de Gravelines. Novembre 2012 - Octobre 2013
Provedor de dados: 5
Autores: Antajan, Elvire; Delesmont, Régis; Foveau, Aurelie; Hervio Heath, Dominique; Lefebvre, Alain; Loots, Christophe; Luczak, Christophe.
This is the 36th annual surveillance report concerning the nuclear power plant of Gravelines. Its very high power level results from six plant units located on the shore and is characterised by a cooling system with a coastal surface input and output. The production of electricity began in 1980 and reached maximum in 1986. Surveys concern monitoring of pelagic system (hydrology, microbiology, phytoplankton, and zooplankton), fish populations (larvae and eggs of Sole and Sprat) or crustaceans (shrimps), and benthic macrofauna (intertidal and subtidal). This survey deals with spatial and temporal approaches (i) study of the direct impact by comparison of the input and output seawater stations, (ii) study of medium and long term evolution of the area by...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton – Microbiologie; Benthos; Nuclear power plant; Gravelines; Network survey; Hydrology; Fisheries; Plankton; Microbiology; Benthos.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00197/30862/29230.pdf

Surveillance écologique du site de production électronucléaire de Gravelines Novembre 2011– Octobre 2012
Provedor de dados: 5
Autores: Antajan, Elvire; Hervio Heath, Dominique; Lefebvre, Alain; Loots, Christophe; Luczak, Christophe.
This is the 35th annual surveillance report concerning the nuclear power plant of Gravelines. Its very high power level results from six plant units located on the shore and is characterised by a cooling system with a coastal surface input and output. The production of electricity began in 1980 and reached maximum in 1986. Surveys concern monitoring of pelagic system (hydrology, microbiology, phytoplankton, and zooplankton), fish populations (larvae and eggs of Sole and Sprat) or crustaceans (shrimps), and benthic macrofauna (intertidal and subtidal). This survey deals with spatial and temporal approaches (i) study of the direct impact by comparison of the input and output seawater stations, (ii) study of medium and long term evolution of the area by...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton; Benthos; Microbiologie; Nuclear power plant; Gravelines; Network survey; Hydrology; Fisheries; Plankton; Microbiology; Benthos.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00180/29116/27522.pdf

Evaluating the histological-based condition of wild collected larval fish: A synthetic approach applied to common sole (Solea solea)
Provedor de dados: 5
Autores: Di Pane, Julien; Gendrot, F.; Giraldo, Carolina; Marchal, Paul; Koubbi, Philippe; Loots, Christophe.
In the present study, the histological-based condition of common sole (Solea solea) larvae in the English Channel was evaluated to assess the relevance of experimentally-calibrated indices for wild collected specimens. Based on topographical observation of foregut, midgut, hindgut, liver and pancreas, each of the 202 larvae analysed was attributed one of the six grades of a condition index that was developed for sole in the nineties. In parallel, a synthetic table of 20 criteria historically used as condition indicators was created from an extensive review of the literature. These criteria were related to tissular integrity, cells height, nuclei, presence of prey and vacuolisation of the same five target organs. For each larva, each criterion was scored on...
Tipo: Text
Palavras-chave: Condition index; Eastern English Channel; Fish larvae; Histology; Solea solea; Starvation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00601/71325/69754.pdf

Feeding strategy of Downs herring larvae in the English Channel and North Sea
Provedor de dados: 5
Autores: Denis, Jeremy; Vallet, Carole; Vincent, Dorothée; Courcot, Lucie; Marchal, Paul; Loots, Christophe.
The aim of this study was to characterize the feeding strategy of Downs herring larvae at "critical period" during winter in the English Channel and North Sea was defined to assess whether nutrition is responsible for low recruitment in stocks over the past years. Data collected during the French part of the International Bottom Trawl Survey from 2008 to 2014 were used to analyse fish larvae diet by direct observation using Scanning Electron Microscope (SEM). Gut content methods generally used for copepods was adapted to fish larvae to assess phytoplankton ingestion. The relative importance of small preys (0,5-375µm) observed in gut contents proved the essential role of SEM to better acknowledge Downs herring diet. We demonstrated that Downs herring larvae...
Tipo: Text
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00255/36608/35174.pdf

Surveillance écologique et halieutique du site électronucléaire de Penly. Année 2015. Rapport scientifique annuel
Provedor de dados: 5
Autores: Schlaich, Ivan; Simon, Benjamin; Loots, Christophe; Antajan, Elvire; Rabiller, Emilie; Maheux, Frank; Schapira, Mathilde; Francoise, Sylvaine.
Monitoring n° 29 of PENLY nuclear power - plant takes into account studies between March and September 2015.  Hydrology, microbiology, phytoplankton, zooplankton and fishing are studied.  This power-plant has been in operation for twenty-six years.
Tipo: Text
Palavras-chave: Pélagos; Halieutique; Centrale nucléaire; Surveillance; Pelagos; Fishing; Nuclear power plant; Monitoring.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00360/47128/47070.pdf

Ontogenetic shift in the energy allocation strategy and physiological condition of larval plaice (Pleuronectes platessa)
Provedor de dados: 5
Autores: Di Pane, Julien; Joly, Lea; Koubbi, Philippe; Giraldo, Carolina; Monchy, Sébastien; Tavernier, Eric; Marchal, Paul; Loots, Christophe.
Condition indices aim to evaluate the physiological status of fish larvae by estimating both the level of starvation and potential of survival. Histological indices reveal direct effects of starvation whereas biochemical indices such as lipid classes or RNA:DNA ratios are used as proxies of condition, giving information on the amount of energy reserves and growth rate, respectively. We combined these three indices to evaluate ontogenetic variations of growth performance, lipid dynamics and nutritional condition of plaice larvae caught in the field during winter 2017 in the eastern English Channel and the Southern Bight of the North Sea. RNA:DNA ratios showed that larvae at the beginning of metamorphosis (stage 4) had a lower growth rate than younger...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00514/62610/66974.pdf

Surveillance écologique et halieutique du site électronucléaire de Penly. Année 2013 - Rapport scientifique annuel
Provedor de dados: 5
Autores: Schlaich, Ivan; Antajan, Elvire; Baehr, Antoine; Devreker, David; Francoise, Sylvaine; Loots, Christophe; Rabiller, Emilie; Schapira, Mathilde.
Monitoring n° 27 of PENLY nuclear power - plant takes into account studies between March and September 2013. Hydrology, microbiology, phytoplankton, zooplankton and fishing are studied. This power-plant has been in operation for twenty-four years.
Tipo: Text
Palavras-chave: Pelagos; Halieutique; Centrale nucléaire; Surveillance; Pelagos; Fishing; Nuclear power plant; Monitoring.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29912/28372.pdf

Surveillance écologique du site de production électronucléaire de Gravelines Novembre 2010 - Octobre 2011
Provedor de dados: 5
Autores: Antajan, Elvire; Delesmont, Régis; Dewarumez, Jean-marie; Lefebvre, Alain; Loots, Christophe; Luczak, Christophe.
This is the 34th annual surveillance report concerning the nuclear power plant of Gravelines. Its very high power level results from six plant units located on the shore and is characterised by a cooling system with a coastal surface input and output. The production of electricity began in 1980 and reached maximum in 1986. Surveys concern monitoring of pelagic system (hydrology, microbiology, phytoplankton, zooplankton), fish populations (larvae and eggs of Sole and Sprat) or crustaceans (shrimps), and benthic macrofauna (intertidal and subtidal). This survey deals with spatial and temporal approaches (i) study of the direct impact by comparison of the input and output seawater stations, (ii) study of medium and long term evolution of the area by...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton; Microbiologie; Benthos; Nuclear power plant; Gravelines; Network survey; Hydrology; Fisheries; Plankton; Microbiology; Benthos.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00076/18709/16282.pdf

Surveillance écologique et halieutique du site électronucléaire de Penly. Année 2016. Rapport scientifique annuel
Provedor de dados: 5
Autores: Schlaich, Ivan; Antajan, Elvire; Francoise, Sylvaine; Loots, Christophe; Maheux, Frank; Rabiller, Emilie; Schapira, Mathilde; Simon, Benjamin.
Monitoring n° 29 of PENLY nuclear power - plant takes into account studies between March and September 2016. Hydrology, microbiology, phytoplankton, zooplankton and fishing are studied. This power-plant has been in operation for twenty-six years.
Tipo: Text
Palavras-chave: Pélagos; Halieutique; Centrale nucléaire; Surveillance; Pelagos; Fishing; Nuclear power plant; Monitoring.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00398/50925/51700.pdf

Surveillance Écologique et Halieutique. Site de Gravelines. Novembre 2015 - Octobre 2016
Provedor de dados: 5
Autores: Antajan, Elvire; Devreker, David; Lefebvre, Alain; Loots, Christophe; Rocroy, Mélanie; Ruellet, Thierry.
This is the 39th annual surveillance report concerning the nuclear power plant of Gravelines. Its very high power level results from six plant units located on the shore and is characterised by a cooling system with a coastal surface input and output. The production of electricity began in 1980 and reached a maximum in 1986. Surveys concern monitoring of pelagic system (hydrology, microbiology, phytoplankton, and zooplankton), fish populations (larvae and eggs of Sole and Sprat) or crustaceans (shrimps), and benthic macrofauna (intertidal and subtidal). This survey deals with spatial and temporal approaches (i) study of the direct impact by comparison of the input and output seawater stations, (ii) study of medium and long term evolution of the area by...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton; Benthos; Microbiologie; Nuclear power plant; Gravelines; Network survey; Hydrology; Fisheries; Plankton; Microbiology; Benthos.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00383/49458/49957.pdf

Spatial patterns and GIS habitat modelling of Solea solea, Pleuronectes flesus and Limanda limanda fish larvae in the eastern English Channel during the spring
Provedor de dados: 5
Autores: Koubbi, Philippe; Loots, Christophe; Cotonnec, Gwenaelle; Harlay, Xavier; Grioche, Alain; Vaz, Sandrine; Martin, Canterbury Christ Church University; Walkey, Mike; Carpentier, Andre.
The spring distribution of larval fish stages of flatfishes in the Dover Strait (eastern English Channel) was studied in 1995 and 1999. Fish larvae were identified and sorted according to developmental stages in order to study their ontogenic distribution. The French coastal waters are characterised by an unstable tide-dependent front, which influences larval dispersion. In spring, the French coastal waters have a high phytoplanktonic production. They have higher temperatures, lower salinities and differences in current intensity compared with the central English Channel waters. Generalised Additive Models (GAM) combined with Geographic Information Systems (GIS) were used to model the potential habitats of life stages considering data from three major...
Tipo: Text
Palavras-chave: English Channel; Fish larvae; Geostatistics; GIS; GAM.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2090.pdf

Spatial interactions between saithe (Pollachius virens) and hake (Merluccius merluccius) in the North Sea
Provedor de dados: 5
Autores: Cormon, Xochitl; Loots, Christophe; Vaz, Sandrine; Vermard, Youen; Marchal, Paul.
Spatial interactions between saithe (Pollachius virens) and hake (Merluccius merluccius) were investigated in the North Sea. Saithe is a well-established species in the North Sea, while occurrence of the less common hake has recently increased in the area. Spatial dynamics of these two species and their potential spatial interactions were explored using binomial generalized linear models (GLM) applied to the International Bottom Trawl Survey (IBTS) data from 1991 to 2012. Models included different types of variables: (i) abiotic variables including sediment types, temperature, and bathymetry; (ii) biotic variables including potential competitors and potential preys presence; and (iii) spatial variables. The models were reduced and used to predict and map...
Tipo: Text
Palavras-chave: Biotic interactions; Competition; Generalized linear models; Hake; North Sea; Overlap; Predator-prey relationship; Saithe; Species distribution modelling.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00200/31146/29847.pdf

CHARM : Atlas des Habitats des Ressources Marines de la Manche Orientale
Provedor de dados: 5
Autores: Carpentier, Andre; Coppin, Franck; Dauvin, Jean-claude; Desroy, Nicolas; Dewarumez, Jean-marie; Eastwood, Paul D.; Ernande, Bruno; Harrop, Stuart; Kemp, Zarine; Koubbi, Philippe; Williams, Nigel Leader; Lefebvre, Alain; Lemoine, Michel; Loots, Christophe; S. Martin, Corinne; Meaden, Geoff J.; Ryan, Nick; Tan, Lei; Vaz, Sandrine; Walkey, Mike.
INTRODUCTION:  The Dover Strait (Figure 1) connects the North Sea to the English Channel. Here, northern France and South-East England are at their closest. This narrow corridor, one of the world's busiest straits for maritime shipping, is a key economic area for numerous activities, such as leisure and tourism, international ports and shipping, plus the exploitation of living or abiotic marine resources. This area is a significant resource for fisheries because many commercial fish species are abundant there, but also because of the presence of nursery and spawning areas and migratory routes linked to specific environmental characteristics. The vulnerability of these resources, which are subjected to strong anthropogenic pressures, has brought together...
Tipo: Text
Palavras-chave: Survey; Landings; Larvae; Eastern channel; Benthos; Fish; Sig; Policy analysis; Species protection; Habita protection; Protected areas; Marine biodiversity conservation.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/rapport-2350.pdf

Surveillance écologique du site de production électronucléaire de Gravelines. Année 2019
Provedor de dados: 5
Autores: Antajan, Elvire; Devreker, David; Loots, Christophe; Rocroy, Mélanie; Rolet, Céline.
Ce travail constitue le 42ème rapport de surveillance du site électronucléaire de Gravelines dont la grande puissance énergétique est assurée par le fonctionnement de 6 tranches. Ce site, implanté sur le littoral, présente une prise d’eau de mer assurant le refroidissement du système et un rejet côtier d’eau chaude en surface. Le fonctionnement de la centrale a débuté en 1980 et elle a atteint la puissance maximale en 1986. La surveillance concerne les domaines pélagique (hydrologie, microbiologie, phytoplancton, zooplancton), halieutique (larves et œufs de sole, de sprat et crevettes grises), et benthique (intertidal et subtidal). La stratégie de surveillance est basée sur une approche spatiale et temporelle (i) Étude de l’impact immédiat par comparaison...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton; Microbiologie; Benthos.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00645/75679/76585.pdf

Delineating recurrent fish spawning habitats in the North Sea
Provedor de dados: 5
Autores: Lelievre, Stephanie; Vaz, Sandrine; Martin, C. S.; Loots, Christophe.
The functional value of spawning habitats makes them critically important for the completion of fish life cycles and spawning grounds are now considered to be “essential habitats”. Inter-annual fluctuations in spawning ground distributions of dab (Limanda Limanda), plaice (Pleuronectes platessa), cod (Gadus morhua) and whiting (Merlangius merlangus) were investigated in the southern North Sea and eastern English Channel, from 2006 to 2009. The preferential spawning habitats of these species were modelled using generalised linear models, with egg distribution being used as proxy of spawners’ location. Egg spatial and temporal distributions were explored based on six environmental variables: sea surface temperature and salinity, chlorophyll a concentration,...
Tipo: Text
Palavras-chave: Egg Distribution; Spawning Grounds; North Sea; Temporal Variability; Habitat Modelling; GLM.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00185/29674/28046.pdf

Surveillance écologique et halieutique du site électronucléaire de Penly. Année 2012 - Rapport scientifique annuel
Provedor de dados: 5
Autores: Schlaich, Ivan; Cochard, Marie-laure; Francoise, Sylvaine; Loots, Christophe; Devreker, David; Monbet, Philippe.
Monitoring n° 26 of PENLY nuclear power - plant takes into account studies between March and September 2012. Hydrology, microbiology, phytoplankton, zooplankton and fishing are studied. This power-plant has been in operation for twenty three years.
Tipo: Text
Palavras-chave: Pélagos; Halieutique; Centrale nucléaire; Surveillance; Pelagos; Fishing; Nuclear power plant; Monitoring.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00154/26573/24707.pdf

Inter-annual variability of North Sea plaice spawning habitat
Provedor de dados: 5
Autores: Loots, Christophe; Vaz, Sandrine; Koubbi, P.; Planque, Benjamin; Coppin, Franck; Verin, Yves.
Potential spawning habitat is defined as the area where environmental conditions are suitable for spawning to occur. Spawning adult data from the first quarter (January-March) of the International Bottom Trawl Survey have been used to study the inter-annual variability of the potential spawning habitat of North Sea plaice from 1980 to 2007. Generalised additive models (GAM) were used to create a model that related five environmental variables (depth, bottom temperature and salinity, seabed stress and sediment type) to presence-absence and abundance of spawning adults. Then, the habitat model was applied each year from 1970 to 2007 to predict inter-annual variability of the potential spawning habitat. Predicted responses obtained by GAM for each year were...
Tipo: Text
Palavras-chave: Potential Habitat; Generalised Additive Models; Spawning; Inter-annual Variability; North Sea plaice; Spatial Distribution.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00018/12900/9932.pdf

Understanding what controls the spatial distribution of fish populations using a multi-model approach
Provedor de dados: 5
Autores: Planque, Benjamin; Loots, Christophe; Petitgas, Pierre; Lindstrom, Ulf; Vaz, Sandrine.
Understanding and predicting the distribution of organisms in heterogeneous environments lies at the heart of ecology. The spatial distribution of fish populations observed in the wild results from the complex interactions of multiple controls both external or internal to the fish populations. Whilst species distribution models (SDMs) have been mostly concerned with static description of species distribution as a function of environmental constraints, models of animal movements (MAMs) have focussed on the dynamic nature of spatial distribution of groups of individuals under a number of constraints external and internal to the population. Besides SDMs and MAMs, modelling the spatial distribution of fish populations can be achieved by models that are...
Tipo: Text
Palavras-chave: Demographic structure; Density-dependent habitat selection; Environmental control; Fish spatial distribution models; Multi-model inference; Population memory; Spatial dependency.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00022/13309/10360.pdf

Recent changes in ichthyoplanktonic assemblages of the eastern English Channel
Provedor de dados: 5
Autores: Di Pane, Julien; Koubbi, Philippe; Giraldo, Carolina; Lefebvre, Valerie; Caboche, Josselin; Marchal, Paul; Loots, Christophe.
ish assemblages vary through time in both abundance and diversity, often due to changes in climate. The potential consequences of these changes on the larval phase need to be considered. In the Eastern English Channel, fish larvae of 30 taxa, from surveys conducted during spring in the nineties and in 2017 with bongo nets, were used to investigate seasonal and interannual changes in larval assemblages with different statistical tests and multivariate analyses (Outlying Mean Index, Principal Coordinate Analysis and variance partitioning). The major change observed was significant lower abundances in 2017 (in April and May) compared to the nineties. Most of the dominant taxa were two to three-fold less abundant in 2017 than the 1990s. We suggest that the...
Tipo: Text
Palavras-chave: Fish larvae; Temporal variations; Atlantic Multidecadal Oscillation; Outlying Mean Index; Variance partitioning; English Channel.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00604/71631/70078.pdf

Spatial distribution and interannual variations in the size frequency distribution and abundances of Pleuragramma antarcticum larvae in the Dumont d’Urville Sea from 2004 to 2010
Provedor de dados: 5
Autores: Koubbi, Philippe; O'Brien, Colleen; Loots, Christophe; Giraldo, Carolina; Smith, Martina; Tavernier, Eric; Vacchi, Marino; Vallet, Carole; Chevallier, Jean; Moteki, Masato.
This paper investigates the abundance and distribution of Pleuragramma antarcticum larvae by size class in the Dumont d’Urville Sea from 2004 to 2010. Samples were collected between Dumont d’Urville station and the Mertz Glacier Tongue onboard the RV l’Astrolabe for studying the inter-annual and spatial distribution of fish larvae and the TRV Umitaka Maru for looking at life stages vertical distributions. The seabed depression adjacent to the Mertz Glacier Tongue and in Commonwealth Bay hosted high abundances of small P. antarcticum larvae, while larger larvae were found in lower abundance and further offshore. We found that canyons, sea ice, stability of the water column and temperatures are important features for determining suitable areas for young...
Tipo: Text
Palavras-chave: Pleuragramma antarcticum; East Antarctic shelf; Fish larvae; Life cycle; Inter-annual variations.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00069/17992/15528.pdf

Surveillance écologique du site de production électronucléaire de Gravelines. Novembre 2017 – Octobre 2018
Provedor de dados: 5
Autores: Antajan, Elvire; Devreker, David; Loots, Christophe; Rocroy, Mélanie; Alizier, Sandrine; Ruellet, Thierry.
Ce travail constitue le 41ème rapport de surveillance du site électronucléaire de Gravelines dont la grande puissance énergétique est assurée par le fonctionnement de 6 tranches. Ce site, implanté sur le littoral, présente une prise d’eau de mer assurant le refroidissement du système et un rejet côtier d’eau chaude en surface. Le fonctionnement de la centrale a débuté en 1980 et elle a atteint la puissance maximale en 1986. La surveillance concerne les domaines pélagique (hydrologie, microbiologie, phytoplancton, zooplancton), halieutique (larves et œufs de sole, de sprat et crevettes grises), et benthique (intertidal et subtidal). La stratégie de surveillance est basée sur une approche spatiale et temporelle (i) Étude de l’impact immédiat par comparaison...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton; Microbiologie; Benthos.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59895/63077.pdf

Recurrent winter observations of Mnemiopsis leidyi swarms in the Southern North Sea
Provedor de dados: 5
Autores: Antajan, Elvire; Loots, Christophe; Travers-trolet, Morgane; Vaz, Sandrine.
Tipo: Text
Palavras-chave: Ctenophore; Invasive species; Mnemiopsis leidyi; North Sea.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00259/37007/35506.pdf

Surveillance écologique et halieutique du site électronucléaire de Flamanville. Année 2017
Provedor de dados: 5
Autores: Le Gac-abernot, Chantal; Antajan, Elvire; Courtay, Gaelle; Dreves, Luc; Hernandez Farinas, Tania; Lamort, Laure; Loots, Christophe; Rabiller, Emilie; Ropert, Michel; Schlaich, Ivan.
The monitoring report (n° 35) of the nuclear power plant located in Flamanville (France) takes into account studies carried out between March and September 2017. Environmental effects and potential impacts of the aquatic system are reported through different chapters: hydrology, microbiology, phytoplankton, zooplankton, fisheries, intertidal phytobenthos and zoobenthos. This power plant has been in operation for thirty-two years.
Tipo: Text
Palavras-chave: Centrale nucléaire; Flamanville; Surveillance; Benthos; Halieutique; Pelagos; Flamanville; Monitoring; Nuclear power plant; Benthos; Fisheries; Pelagos.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00458/57008/58904.pdf

Surveillance écologique et halieutique du site électronucléaire de Penly. Année 2014 - Rapport scientifique annuel
Provedor de dados: 5
Autores: Schlaich, Ivan; Simon, Benjamin; Loots, Christophe; Antajan, Elvire; Rabiller, Emilie; Maheux, Frank; Schapira, Mathilde; Francoise, Sylvaine.
Monitoring n° 28 of PENLY nuclear power - plant takes into account studies between March and September 2014. Hydrology, microbiology, phytoplankton, zooplankton and fishing are studied. This power-plant has been in operation for twenty-five years.
Tipo: Text
Palavras-chave: Pélagos; Halieutique; Centrale nucléaire; Surveillance; Pelagos; Fishing; Nuclear power plant; Monitoring.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00292/40273/38644.pdf

Surveillance Écologique et Halieutique Site de Gravelines. Novembre 2013 - Octobre 2014
Provedor de dados: 5
Autores: Antajan, Elvire; Lefebvre, Alain; Loots, Christophe; Luczak, Christophe; Ruellet, Thierry.
This is the 37th annual surveillance report concerning the nuclear power plant of Gravelines. Its very high power level results from six plant units located on the shore and is characterised by a cooling system with a coastal surface input and output. The production of electricity began in 1980 and reached maximum in 1986. Surveys concern monitoring of pelagic system (hydrology, microbiology, phytoplankton, and zooplankton), fish populations (larvae and eggs of Sole and Sprat) or crustaceans (shrimps), and benthic macrofauna (intertidal and subtidal). This survey deals with spatial and temporal approaches (i) study of the direct impact by comparison of the input and output seawater stations, (ii) study of medium and long term evolution of the area by...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton – Microbiologie; Benthos; Nuclear power plant; Gravelines; Network survey; Hydrology; Fisheries; Plankton; Microbiology; Benthos.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00259/37004/35501.pdf

Feeding strategy of Downs herring larvae (Clupea harengus L.) in the English Channel and North Sea
Provedor de dados: 5
Autores: Denis, Jeremy; Vallet, Carole; Courcot, Lucie; Lefebvre, Valerie; Caboche, Josselin; Antajan, Elvire; Marchal, Paul; Loots, Christophe.
This study aims to characterize the larval feeding strategy of the Downs sub-population of North Sea herring (Clupea harengus L.). Diet composition, vacuity rate and prey selectivity of larvae from 8 to 15 mm collected during the International Bottom Trawl Survey (IBTS) - MIK sampling from 2008 to 2013 were assessed by direct observation of their gut contents using Scanning Electron Microscopy (SEM). The high contribution of protists and small zooplanktonic prey observed in the gut contents proved the relevance of SEM to study the diet of first feeding larvae. The relatively low vacuity rate of 45% suggests that food may not be a limiting factor for Downs herring larvae in winter. These larvae appeared to be omnivorous and there was a clear shift in term...
Tipo: Text
Palavras-chave: Diet; Feeding strategy; Selectivity index; Scanning electronic microscopy; Downs herring larvae; Gut content.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00345/45606/45226.pdf

What controls the spatial distribution of the North Sea plaice spawning population? Confronting ecological hypotheses through a model selection framework
Provedor de dados: 5
Autores: Loots, Christophe; Vaz, Sandrine; Planque, Benjamin; Koubbi, Philippe.
The spatial dynamics of spawning fish are crucial because they influence the survival rates of eggs and larvae and ultimately impact the reproductive success of populations. The factors that control these dynamics are complex and potentially many, and they interact. A model-selection-based approach was developed to confront various hypotheses of control of the spatial distribution of spawning population of North Sea plaice (Pleuronectes platessa). For each hypothesis or combination thereof, statistical models were constructed. These were then ranked and selected based on their ability to adjust and predict observed spatial distributions. The North Sea plaice population seems to have developed strong attachment to specific spawning sites, where geographic...
Tipo: Text
Palavras-chave: AIC; Multi model inference; North Sea plaice; Spatial distribution; Spawning population.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00000/11157/9933.pdf

Modelling Fish Habitat Suitability in the Eastern English Channel. Application to community habitat level
Provedor de dados: 5
Autores: Vaz, Sandrine; Carpentier, Andre; Loots, Christophe; Koubbi, Philippe.
Valuable marine habitats and living resources can be found in the Eastern English Channel and in 2003, a Franco-British Interreg IIIA project, ‘Eastern Channel Habitat Atlas for Marine Resource Management’ (CHARM), was initiated to support decision-making for management of essential fish habitats. Fish habitat corresponds to geographic areas within which ranges of environmental factors define the presence of a particular species. Habitat Suitability index (HSI) modelling was used to relate fish geographic distribution and their relation towards environmental factors and to delineate their optimum habitat. This study was based on data obtained from 1988-2003 IFREMER’s Channel Ground Fish Surveys, including both species abundance and environmental data....
Tipo: Text
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00066/17765/15281.pdf

Surveillance écologique et halieutique du site électronucléaire de Penly. Année 2017. Rapport scientifique annuel
Provedor de dados: 5
Autores: Schlaich, Ivan; Antajan, Elvire; Francoise, Sylvaine; Loots, Christophe; Lamort, Laure; Maheux, Frank; Rabiller, Emilie; Ropert, Michel; Simon, Benjamin.
Monitoring n° 30 of PENLY nuclear power - plant takes into account studies between March and September 2017. Hydrology, microbiology, phytoplankton, zooplankton and fishing are studied. This power-plant has been in operation for twenty-eight years.  
Tipo: Text
Palavras-chave: Pélagos; Halieutique; Centrale nucléaire; Surveillance; Pelagos; Fishing; Nuclear power plant; Monitoring.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00450/56199/57760.pdf

Understanding what controls the spawning distribution of North Sea whiting (Merlangius merlangus) using a multi-model approach
Provedor de dados: 5
Autores: Loots, Christophe; Vaz, Sandrine; Planque, Benjamin; Koubbi, Philippe.
The processes that control the spatial distribution of North Sea whiting (Merlangius merlangus) spawning adults are investigated using a statistical multi-model approach. Models of external and internal controls on the population, such as environmental conditions, spatial constraints, present or past spatial distribution, and demographic state of the population, are evaluated, compared and ranked to select those that are the best able to predict the observed distribution of spawning adults. Model selection is greatly influenced by the selection method, either based on data fitting or prediction, as well as by the threshold value used to stop the selection. Model selection based on prediction tends to select simpler models than selection based on data...
Tipo: Text
Palavras-chave: Akaike information criterion; Hypotheses inference; Model selection; North Sea; Spawning distribution; Whiting.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00022/13313/11361.pdf

Spawning distribution of North Sea plaice and whiting from 1980 to 2007
Provedor de dados: 5
Autores: Loots, Christophe; Vaz, Sandrine; Planque, Benjamin; Koubbi, Philippe.
The spatial distributions of spawning population of North Sea plaice and whiting were studied using geostatistical analyses. Variograms were computed each year since 1980 on abundance data of spawning adults using the first quarter data from the International Bottom Trawl Survey. Maps of spatial distribution of spawning adults were produced using kriging interpolation. For both species, distributions of spawning adults were in agreement with historical spawning grounds previously described from location of their eggs. This showed that spawning adults distribution may be used to infer the distribution of both plaice during its spawning peak and whiting at the beginning of its spawning period. Both species were strongly spatially structured with abundances...
Tipo: Text
Palavras-chave: Spatial distribution; Plaice; Whiting; North Sea; Inter-annual variability; Spawning adults.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00022/13317/11191.pdf

Surveillance écologique du site de production électronucléaire de Gravelines Novembre 2009 – Octobre 2010
Provedor de dados: 5
Autores: Antajan, Elvire; Delesmont, Régis; Dewarumez, Jean-marie; Lefebvre, Alain; Loots, Christophe; Luczak, Christophe.
This is the 33th annual surveillance report concerning the nuclear power plant of Gravelines. Its very high power level results from six plant units located on the shore and is characterised by a cooling system with a coastal surface input and output. The production of electricity began in 1980 and reached maximum in 1986. Surveys concern monitoring of pelagic system (hydrology, microbiology, phytoplankton, zooplankton), fish populations (larvae and eggs of Sole and Sprat) or crustaceans (shrimps), and benthic macrofauna (intertidal and subtidal). This survey deals with spatial and temporal approaches (i) study of the direct impact by comparison of the input and output seawater stations, (ii) study of medium and long term evolution of the area by...
Tipo: Text
Palavras-chave: Centrale nucléaire; Gravelines; Surveillance; Hydrologie; Halieutique; Plancton; Benthos; Microbiologie; Nuclear power plant; Gravelines; Network survey; Hydrology; Fisheries; Plankton; Microbiology; Benthos.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00055/16593/14100.pdf

Avis sur un projet d'expérimentation d'élevage d'huîtres sur des structures mytilicoles à Oye Plage dans le département du Pas de Calais
Provedor de dados: 5
Autores: Gangnery, Aline; Garcia, Celine; Loots, Christophe.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61150/64580.pdf