References of "Hecq, Jean-Henri"
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See detailAbundance and variability of jellyfishes in the Bay of Calvi, Corsica
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Goffart, Anne ULg

Scientific conference (2014, May 29)

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See detailAtlas du zooplancton des eaux côtières corses, version du 04/06/2014
Hecq, Jean-Henri ULg; Collignon, Amandine ULg; Goffart, Anne ULg

Book published by Travail de synthèse réalisé à la demande de l’Agence de l’Eau RMC, France (2014)

Cet atlas a pour but : de fournir, sous forme de manuel pratique rédigé en français, un guide illustré des principaux taxons zooplanctoniques, des protistes et des méduses aux céphalopodes; d’illustrer la ... [more ▼]

Cet atlas a pour but : de fournir, sous forme de manuel pratique rédigé en français, un guide illustré des principaux taxons zooplanctoniques, des protistes et des méduses aux céphalopodes; d’illustrer la biodiversité et l’écologie des espèces dominantes et de quelques espèces moins fréquentes mais spectaculaires, de synthétiser, sous un graphisme attrayant, les informations permettant l’identification des organismes présentés.   Pour chaque espèce ou groupe d’espèces, une fiche descriptive renseigne le nom latin et la classification. Les éléments morphologiques qui permettent de différencier les espèces présentées sont soulignés. Les fiches sont illustrées par des photos originales réalisées sur du plancton prélevé en Baie de Calvi (Corse), et dans certains cas, de notes sur la biologie et l'écologie. L’atlas du zooplancton des eaux côtières corses s’adresse prioritairement aux gestionnaires de l’environnement, aux techniciens de la mer, aux naturalistes ainsi qu’aux étudiants et enseignants des Masters en Sciences marines. Il est conçu pour être complété par les utilisateurs qui peuvent insérer leurs propres fiches au sein des groupes présentés. [less ▲]

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See detailContrasting patterns of phytoplankton communities in two coastal ecosystems in relation to environmental factors (Corsica, NW Mediterranean Sea)
Garrido, Marie; Koeck, Barbara; Goffart, Anne ULg et al

in Diversity (2014), 6

Corsica Island is a sub-basin of the Northwestern Mediterranean Sea, with hydrological features typical of both oligotrophic systems and eutrophic coastal zones. Phytoplankton assemblages in two coastal ... [more ▼]

Corsica Island is a sub-basin of the Northwestern Mediterranean Sea, with hydrological features typical of both oligotrophic systems and eutrophic coastal zones. Phytoplankton assemblages in two coastal ecosystems of Corsica (the deep Bay of Calvi and the shallow littoral of Bastia) show contrasting patterns over a one-year cycle. In order to determine what drives these variations, seasonal changes in littoral phytoplankton are considered together with environmental parameters. Our methodology combined a survey of the physico-chemical structure of the subsurface water with a characterization of the phytoplankton community structure. Sampling provided a detailed record of the seasonal changes and successions that occur in these two areas. Results showed that the two sampled stations presented different phytoplankton abundance and distribution patterns, notably during the winter–spring bloom period. Successions in pico-, nano-, and microphytoplankton communities appeared mainly driven by differences in the ability to acquire nutrients, and in community-specific growth rates. Phytoplankton structure and dynamics are discussed in relation to available data on the Northwestern Mediterranean Sea. These results confirm that integrated monitoring of coastal areas is a requisite for gaining a proper understanding of marine ecosystems. [less ▲]

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See detailAnnual variation in neustonic micro- and meso-plastic particles and zooplankton in the Bay of Calvi (Mediterranean–Corsica)
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Galgani, François et al

in Marine Pollution Bulletin (2013)

The annual variation in neustonic plastic particles and zooplankton was studied in the Bay of Calvi 23 (Corsica) between 30 August 2011 and 7 August 2012. Plastic particles were classified into three size ... [more ▼]

The annual variation in neustonic plastic particles and zooplankton was studied in the Bay of Calvi 23 (Corsica) between 30 August 2011 and 7 August 2012. Plastic particles were classified into three size classes, small microplastics (0.2–2 mm), large microplastics (2–5 mm) and mesoplastics (5–10 mm). 74% of the 38 samples contained plastic particles of varying composition: e.g. filaments, polystyrene, thin plastic films. An average concentration of 6.2 particles/100 m2 was observed. The highest abundance values (69 particles/100 m2) observed occurred during periods of low offshore wind conditions. These values rose in the same order of magnitude as in previous studies in the North Western Mediterranean. The relationships between the abundance values of the size classes between zooplankton and plastic particles were then examined. The ratio for the intermediate size class (2–5 mm) reached 2.73. This would suggest a potential confusion for predators regarding planktonic prey of this size class. [less ▲]

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See detailEtude de la variation saisonnière des quantités de microplastiques de la zone de Calvi
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Goffart, Anne ULg

Report (2013)

L’étude a pour objectif de collecter des données d’abondance de microplastiques au cours d’un cycle annuel dans une zone peu impactée par l’activité anthropique locale, la Baie de Calvi (Corse). Une ... [more ▼]

L’étude a pour objectif de collecter des données d’abondance de microplastiques au cours d’un cycle annuel dans une zone peu impactée par l’activité anthropique locale, la Baie de Calvi (Corse). Une attention particulière est portée aux relations entre l’abondance des microplastiques et celle du zooplancton, ainsi qu’à la nature des organismes qui colonisent les microplastiques. [less ▲]

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See detailNutrient and phytoplankton responses to external forcing in a Mediterranean coastal area unbiased by terrestrial inputs and local activities (Calvi, Corsica)
Goffart, Anne ULg; Hecq, Jean-Henri ULg; Legendre, Louis

Conference (2013, January)

Despite its relative oligotrophy, the northwestern Mediterranean exhibits rich biodiversity and traditional fishing that are fueled by phytoplankton at the basis of the food web. However, long-term ... [more ▼]

Despite its relative oligotrophy, the northwestern Mediterranean exhibits rich biodiversity and traditional fishing that are fueled by phytoplankton at the basis of the food web. However, long-term observations of phytoplankton biomass reveal high interannual variability controlled by mechanisms that are still poorly understood, but have implications for the way we study and manage coastal zones in a changing world. Here we present a synthesis of a long-term high-resolution study of nutrient and phytoplankton bloom dynamics performed between 1979 and 2011 at a permanent station in the Bay of Calvi (Corsica, northwestern Mediterranean). The ecosystem of the Bay is known to be very sensitive to climate forcing but preserved from local anthropogenic stressors. As a distinctive feature of the area, the winter-spring phytoplankton bloom of the Bay of Calvi is characterized by a very large interannual variability reaching one order of magnitude from one year to another. In order to understand mechanisms controlling this variability, we defined a winter intensity index (WII) that integrates wind stress intensity and water temperature. WII does not evidence any trend over the 1979-2011 period but is closely correlated to nutrient delivery from deep waters and to phytoplankton production. We synthesize our current understanding of phytoplankton response to the combination of external forcings and discuss the impact of expected environmental changes on the pelagic food web in a region that is predicted to be particularly sensitive to long-term changes driven by human activities. [less ▲]

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See detailNutrient and phytoplankton responses to external forcing in a Mediterranean coastal area unbiaised by terrestrial inputs and local activities (Calvi, Corsica)
Goffart, Anne ULg; Hecq, Jean-Henri ULg; Collignon, Amandine ULg et al

Poster (2013, January)

We present a synthesis of a long-term (1979-2011) high-resolution study performed in the oligotrophic Bay of Calvi (Corsica, northwestern Mediterranean). We explore and discuss the mechanisms controlling ... [more ▼]

We present a synthesis of a long-term (1979-2011) high-resolution study performed in the oligotrophic Bay of Calvi (Corsica, northwestern Mediterranean). We explore and discuss the mechanisms controlling the interannual variability of both nutrient and phytoplankton bloom dynamics. [less ▲]

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See detailUNDERSTANDING DRASTIC CHANGES IN ZOOPLANKTON AND MEDUSAE COMMUNITIES OVER THE 2003-2011 PERIOD IN THE MEDITERRANEAN SEA (CORSICA)
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Goffart, Anne ULg

in 2012 ASLO aquatic sciences meeting : Voyages of discovery (2012, July)

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See detailStare-Capmed : Présentation générale du projet et exemple d'une action : "Impact de l'ancrage sur la dynamique des herbiers de posidonies".
Michel, Loïc ULg; Champenois, Willy ULg; Borges, Alberto ULg et al

Conference (2012, May 16)

STARE-CAPMED (STAtion of Reference and rEsearch on Change of local and global Anthropogenic Pressures on Mediterranean Ecosystems Drifts) est un projet de recherche mis en place par Stareso S.A.S. depuis ... [more ▼]

STARE-CAPMED (STAtion of Reference and rEsearch on Change of local and global Anthropogenic Pressures on Mediterranean Ecosystems Drifts) est un projet de recherche mis en place par Stareso S.A.S. depuis janvier 2012. Il a pour objectif d’établir un site de référence à long terme pour la compréhension, par la recherche fondamentale, des processus de l’évolution des écosystèmes méditerranéens côtiers et océaniques en réponse aux changements actuels globaux et locaux des pressions anthropiques. Centré sur la Baie de Calvi et le proche large, il vise à fournir un référentiel basé sur des mesures à haute fréquence qui doivent pouvoir complémenter les réseaux de surveillance basse fréquence et de recherches existants et ainsi faire progresser la compréhension des processus. En outre, le projet doit fournir aux utilisateurs finaux (collectivités locales et régionales, administrations nationales, ...) des orientations de gestion basées sur l’analyse étayée des processus en jeux. Financé par l’Agence de l’eau RMC et la Collectivité Territoriale de Corse, le projet, multidisciplinaire, se décline actuellement selon 10 axes de travail : • Suivi du cadre hydrographique et physico-chimique • Suivi et quantification des pressions anthropiques • Ecosystème planctonique • Benthos de substrat meuble • Benthos de substrat dur et faune vagile • Phanérogames marines et écosystèmes associés • Mouillages et processus d’altération des herbiers de posidonies • Ecotoxicologie et polluants émergents • Bilan CO2 et métabolisme des écosystèmes • Zones protégées, espèces nouvelles, recrutement Pour chacun de ces axes, la stratégie d’échantillonnage est basée sur la comparaison de données obtenues durant des périodes où l’impact anthropique est faible (octobre-avril) avec celles obtenues durant des périodes de pression intense (mai-septembre), et sur la comparaison de données issues de sites de référence peu impactés avec celles provenant de sites où l’impact anthropique est reconnu. A titre d’exemple, le but de l’action "Mouillages et processus d’altération des herbiers de posidonies" est de mettre en évidence les conséquences des altérations liées à l’arrachage de faisceaux de posidonies sur la vitalité de l’herbier. Des zones où la pression de mouillage est reconnue seront définies sur base des travaux de cartographie de l’herbier, également réalisés dans le cadre du projet STARE-CAPMED. Elles seront comparées avec des zones d’herbiers sains témoins par la caractérisation du sédiment (mesures de compacité in situ, mesures des concentrations en O2 et nutriments et du pH de l’eau interstitielle, granulométrie et teneur en matière organique du sédiment, proportions de rhizomes et morts) ainsi que par la définition de l’état physiologique des faisceaux de posidonies (mesures biométriques classiques, analyses des contenus élémentaires en carbone, azote et phosphore) et par l’application d’indices écologiques définis par la DCE (PREI, BIPO, …). Les résultats obtenus permettront d’avoir une vue d’ensemble des processus par lesquels l’impact physique des mouillages de bateaux de plaisance occasionne des dégâts aux herbiers de posidonies. Ils pourront ainsi fournir une base de connaissances solide aux gestionnaires soucieux de limiter cet impact. [less ▲]

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See detailImpact des mouillages forains sur la qualité de l’eau et du phytoplancton : résultats d’une étude préliminaire menée en Baie de Calvi (Corse)
Goffart, Anne ULg; Lejeune, Pierre; Hecq, Jean-Henri ULg

Conference (2012, May 16)

Le plus souvent, l’étude de l’impact des mouillages forains sur l’environnement aquatique concerne l’analyse des dégradations subies par la faune et la flore benthiques. Cependant, dans nos régions, la ... [more ▼]

Le plus souvent, l’étude de l’impact des mouillages forains sur l’environnement aquatique concerne l’analyse des dégradations subies par la faune et la flore benthiques. Cependant, dans nos régions, la grande majorité des bateaux de plaisance construits avant 2008 et de longueur inférieure à 24 mètres ne sont pas équipés d'installations de stockage des eaux résiduaires (eaux ménagères, douches, eaux noires des toilettes) et encore moins de traitement à bord des effluents. Une partie des eaux usées de la plaisance est donc rejetée en mer sans que leur charge polluante et leur impact sur les eaux de surface ne soient connus. De mai à septembre 2011, une étude pilote a été menée dans une zone de mouillage forain de taille moyenne de la Baie de Calvi (site de l’Alga) dans le double but d’analyser la qualité du phytoplancton (biomasse et composition) et la charge en Escherichia coli des eaux de surface. Les données obtenues à l’Alga sont comparées à celles du point de référence DCE pour l’étude du phytoplancton, situé à proximité de STARESO. Les résultats obtenus à l’Alga mettent en évidence les éléments suivants : 1. Biomasse phytoplanctonique totale : la biomasse phytoplanctonique totale de l’Alga est proche de celle mesurée à la station de référence; 2. Composition phytoplanctonique : alors que la composition du phytoplancton du site de référence est constante au cours de la saison estivale, le phytoplancton de l’Alga se caractérise par une augmentation progressive de la concentration en Cyanobactéries, un groupe dont la croissance est favorisée par la présence d’ammonium; 3. Charge en E. coli : des concentrations de 100 à 300 E. coli par 100 ml d’eau sont mesurées de juillet à septembre dans tous les échantillons de surface de la zone de mouillage alors qu’elles sont toujours absentes de la station de référence. Les apports diffus liés aux rejets des eaux usées de la plaisance paraissent donc suffisants pour affecter la composition du phytoplancton et la charge bactérienne des eaux de surface d’une zone de mouillage forain de taille moyenne. Les implications en termes d’impact sur la qualité de l’eau et de l’écosystème seront discutées. Depuis mars 2012, un suivi complet de l’influence de la zone de mouillage forain de l’Alga sur l’écosystème côtier est réalisé dans le cadre du projet STARECAPMED. [less ▲]

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See detailAccumulation de particules de microplastiques dans le neuston en Méditerranée Occidentale et au large de la Corse
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Collard, France ULg et al

in Séminaire sur le milieu marin : 14 au 16 mai 2012 STARESO Corse (2012, May 13)

Des mesures réalisées lors de diverses campagnes océanographiques ont montré la présence de microparticules de plastiques de diverses natures à la surface des mers avec de hauts niveaux de concentration ... [more ▼]

Des mesures réalisées lors de diverses campagnes océanographiques ont montré la présence de microparticules de plastiques de diverses natures à la surface des mers avec de hauts niveaux de concentration et une large dispersion géographique. La taille de ces microplastiques est inférieure à 5 mm et voisine de celle du mésozooplancton. Ces microplastiques s’accumulent dans la couche de surface de la mer qui constitue l’habitat neustonique et qui héberge des assemblages zooplanctoniques particulièrement adaptés à ces conditions extrèmes. Cet habitat est essentiel pour la ponte et la survie des œufs de nombreux poissons et pour le recrutement des juvéniles. Une étude récente que nous avons réalisée au niveau du bassin Nord Occidental Méditerranéen et au large de la Corse (Campagne MED) a montré des concentrations de 0.116 particules/m2 et un rapport moyen de la masse de microplastique à celle du mésozooplancton de 0.5. Ceci nous suggère la potentialité d’une confusion entre les proies et les microplastiques pour les organsismes se nourrissant de zooplancton (Collignon et al., 2012). Une étude de la variabilité de ces microplastiques dans le neuston et l’impact sur celui-ci est actuellement en cours en Baie de Calvi à STARESO. Références : Collignon, A., Hecq, J.-H., Galgani, F., Voisin, P., Collard, F., Goffart, A., 2012. Neustonic microplastic and zooplankton in the North Western Mediterranean Sea. Mar. Pollut. Bull. (In Press). http://dx.doi.org/10.1016/j.marpolbul.2012.01.011 [less ▲]

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See detailNeustonic microplastic and zooplankton in the North Western Mediterranean Sea
Collignon, Amandine ULg; Hecq, Jean-Henri ULg; Galgani, François et al

in Marine Pollution Bulletin (2012), 64

Neustonic microplastic and zooplankton abundance was determined in the North Western Mediterranean Sea during a summer cruise between July 9th and August 6th 2010, with a break between July 22th and 25th ... [more ▼]

Neustonic microplastic and zooplankton abundance was determined in the North Western Mediterranean Sea during a summer cruise between July 9th and August 6th 2010, with a break between July 22th and 25th due to a strong wind event. Ninety percent of the 40 stations contained microplastic particles (size 0.3-5 mm) of various compositions: e.g., filaments, polystyrene, thin plastic films. An average concentration of 0.116 particles/m² was observed. The highest abundances (> 0.36 particles/m²) were observed in the shelf stations. The neustonic plastic particles concentrations were 5 times higher before than after the strong wind event which increased the mixing and the vertical repartition of plastic particles in the upper layers of the water column. The values rise in the same order of magnitude than in the North Pacific Gyre. The average ratio between microplastics and mesozooplankton weights was 0.5 for the whole survey and might induce a potential confusion for zooplankton feeders. [less ▲]

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See detailControl of plankton dynamics and fish recruitment by climate variation : example of Corsica, a Mediterranean island
Goffart, Anne ULg; Hecq, Jean-Henri ULg

Conference (2011, December)

In coastal areas of temperate and tropical small islands, most exploited fish species have undergone large reductions in stock size over the last decades. This impact is believed to be due, in large ... [more ▼]

In coastal areas of temperate and tropical small islands, most exploited fish species have undergone large reductions in stock size over the last decades. This impact is believed to be due, in large measure, to overfishing. However, in some cases, the poor recruitment of young fish or crustaceans of commercial interest is related to climate change. Here we present results acquired from three decades in Corsica, a small Mediterranean island where water quality is unbiased by terrestrial inputs and local activities. We show how plankton dynamics and fish recruitment are controlled by climate variation. Long-term changes of surface plankton dynamics are studied from 1979 at a permanent station in the oligotrophic Bay of Calvi (Corsica, Mediterranean Sea). As a distinctive feature of the area, the plankton bloom is characterized by a very large interannual variability reaching one order of magnitude from one year to another. Studies conducted to understand mechanisms controlling plankton variability emphasize a close relationship between climate variation (mainly winter wind stress intensity), water temperature and phytoplankton biomass. Shifts in phytoplankton community structure contribute to control the dynamics of zooplankton that rely on phytoplankton as food and influence the temporal succession of zooplankton assemblages. Changes in the timing, the biomass and the composition of the zooplankton communities result in a mismatch with the presence of the main food source of the small fish and alter recruitment success. The Corsican example could help to be aware of the potential consequences that changes in plankton dynamics controlled by climate variation will pose to coastal fishermen of small islands. [less ▲]

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See detailResponse of plankton communities of the Bay of Calvi (northwestern Mediterranean) to climate variation over the past three decades
Goffart, Anne ULg; Collignon, Amandine ULg; Hecq, Jean-Henri ULg

in Symposium "Vulnerability of coastal ecosystems to global change and extreme events", Biarritz, France, 18-21 October 2011 (2011, October)

Long-term changes of surface plankton dynamics are studied from three decades at a permanent station in the oligotrophic Bay of Calvi (Corsica, northwestern Mediterranean) where water quality is unbiased ... [more ▼]

Long-term changes of surface plankton dynamics are studied from three decades at a permanent station in the oligotrophic Bay of Calvi (Corsica, northwestern Mediterranean) where water quality is unbiased by terrestrial inputs. As a distinctive feature of the Bay, a plurimodal plankton bloom occurs generally between January and April, with very large interannual variability reaching one order of magnitude from one year to another. Later in the season, the plankton biomass remains very low from May to December. Contrarily to the 1979 - 1998 period where a continuous decrease of phyto- and zooplankton biomasses was observed, observations from the last decade (1999 - 2011) emphasize abrupt changes in plankton biomass and bloom duration from one year to another in response to succession of mild and rigorous winters. Studies conducted to understand mechanisms controlling plankton variability emphasize a close relationship between winter wind stress intensity, water temperature, nutrient inputs and phytoplankton biomass. Total phytoplankton biomass is maximum during years characterized by high winter wind stress and low winter water temperature. From a specific point of view, flagellates are always the dominant component of the winter - spring phytoplankton communities. However, diatoms tend to be more abundant during rigorous winter years. Shifts in phytoplankton community structure contribute to control the dynamics of zooplankton that rely on phytoplankton as food and influence the temporal succession of zooplankton assemblages. Time-series results indicate the high sensitivity of the plankton ecosystem to climate change and confirm that the Bay of Calvi reacts rapidly to external perturbations, which are driven by climate variation. [less ▲]

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See detailFood preferences of larvae of Antarctic silverfish Pleuragramma antarcticum Boulenger, 1902 from Terre Adélie coastal waters during summer 2004
Vallet, Carole; Beans, Cristina; Koubbi, Philippe et al

in Polar Science (2011), 5

Ichthyoplankton samples were collected from 19 to 31 January 2004 in the Dumont d’Urville Sea (East Antarctic shelf). The Nototheniidae Pleuragramma antarcticum comprised more than 90 % of the sampled ... [more ▼]

Ichthyoplankton samples were collected from 19 to 31 January 2004 in the Dumont d’Urville Sea (East Antarctic shelf). The Nototheniidae Pleuragramma antarcticum comprised more than 90 % of the sampled larvae. Gut contents of 95 P. antarcticum larvae were examined. Most larvae fed on phytoplankton, especially diatoms, whereas some other specimens had a mixed diet with phyto- and zooplankton prey. A single specimen fed exclusively on copepods. The stomach contents was dominated by three diatoms taxa, such as Thalassiothrix antarctica, Fragilariopsis spp. and Chaetoceros spp. Prey selection was apparently food density dependent, with an inverse relationship between food abundance and selection feeding. Larvae selected positively some diatoms, such as Coscinodiscus spp. and T. antarctica, presenting a low concentration in the water column compared to Fragilariopsis spp., which were strongly negatively selected. During summer, larvae were opportunistic feeders with a broad trophic niche, which allowed them to switch between different food types. [less ▲]

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See detailImportance of copepod carcasses versus faecal pellets in the upper water column of an oligotrophic area
Frangoulis, Constantin; Skliris, Nikolaos; Lepoint, Gilles ULg et al

in Estuarine Coastal & Shelf Science (2011), 92

Downward flux of zooplankton faecal pellets and carcasses was studied during and after the spring bloom in an oligotrophic coastal area of the Western Mediterranean using a « swimmer-excluding » sediment ... [more ▼]

Downward flux of zooplankton faecal pellets and carcasses was studied during and after the spring bloom in an oligotrophic coastal area of the Western Mediterranean using a « swimmer-excluding » sediment trap. Zooplankton detritus retrieved in the trap were comprised of cylindrical faecal pellets (from meso- and macrozooplankton) and copepod carcasses with a respective carbon flux of 0.05 - 2.69 mg m-2 d-1 and 0.42 - 4.37 mg m-2 d-1. Carbon and nitrogen flux of carcasses always exceeded that of faecal pellets, except at the beginning of the bloom due to a higher contribution of macrozooplankton faecal material. During the peak of phytoplankton biomass, total faecal flux essentially comprised of copepod faecal pellets (68 - 86% of the total faecal carbon), whereas before and after this period, macrozooplankton faecal material dominated (88 - 91% of total faecal carbon flux). Copepod faecal flux was positively correlated with phytoplankton biomass. Estimates of non-predatory biomass mortality rates (from < 0.01 to 0.05 d-1) were negatively correlated with chl a with a time lag of 12 days and were lower than predatory mortality values reported in the same area. The paper discusses the relative importance of carcasses versus faecal pellet flux and of non-predatory versus predatory mortality, as well as the potential role of these zooplankton detritus in supporting the production of benthos in oligotrophic areas. [less ▲]

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See detailJellyfish outbreaks in the Bay of Calvi (Corsica)
Hecq, Jean-Henri ULg; Goffart, Anne ULg; Collignon, Amandine ULg et al

Conference (2010, October)

The interannual variations of the Schyphozoan jellyfish Pelagia noctiluca is estimated by weekly measurements in the Bay of Calvi (Corsica) from 2003. The mean annual abundance reaches a dramatic maximum ... [more ▼]

The interannual variations of the Schyphozoan jellyfish Pelagia noctiluca is estimated by weekly measurements in the Bay of Calvi (Corsica) from 2003. The mean annual abundance reaches a dramatic maximum in 2006. The medusae appear by migration of active swarms on the shelf and at the external limit of the Bay. Degraded individuals drift as passive swarms, throughout inner side of the Bay and embayment. [less ▲]

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See detailMultiparametric observations and analysis in the Bay of Calvi (Corsica), an ideal site for studying the human activity effects and climate changes in the Mediterranean Sea; STARESO
Gobert, Sylvie ULg; Alvera Azcarate, Aïda ULg; Barth, Alexander ULg et al

Conference (2010, May)

STARESO (Station de REcherche Sous marine et Océanographique) is the marine and oceanographic research station of the University of Liège (Belgium) managed by the French company STARESO S.A.. Constructed ... [more ▼]

STARESO (Station de REcherche Sous marine et Océanographique) is the marine and oceanographic research station of the University of Liège (Belgium) managed by the French company STARESO S.A.. Constructed in 1969, it is located near Calvi (Corsica, Western Mediterranean Sea) in an oligotrophic area chosen for the exceptional quality of its coastal waters STARESO offers to the oceanographers, by diving or with boats, a direct access to the sea. The variety of the accessible ecosystems is remarkable and unique in the Mediterranean basin: -the Bay of Calvi is characterized by healthy and very diverse biocenosis (e.g. Posidonia meadows, rocky and sandy communities, -a steep submarine canyon, with depths greater than 1 000 meters, is accessible in 15 minutes of navigation; -the Liguro-Provençal front, a major hydrologic structure, is situated between 10 and 15 miles of the coast. STARESO is accessible all the year for everybody and is functioning like an oceanographic research vessel. The Station is a platform for all oceanographic disciplines with a scientific expertise widely based on a long tradition of interdisciplinary work, and a direct access to time series of physical, chemical and biological data registered with automated systems and variety of sensors deployed in the Bay of Calvi since 30 years. This platform provides the opportunity to reach coastal, pelagic, benthic, deep systems with a manageable cost and ship requirements in a pristine zone. [less ▲]

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See detailA blooming jellyfish in the northeast Atlantic and Mediterranean
Licandro, Priscilla; Conway, D. V. P.; Daly Yahia, M. N. et al

in Biology Letters (2010), 6

A long-term time series of plankton records collected by the continuous plankton recorder (CPR) Survey in the northeast Atlantic indicates an increased occurrence of Cnidaria since 2002. In the years 2007 ... [more ▼]

A long-term time series of plankton records collected by the continuous plankton recorder (CPR) Survey in the northeast Atlantic indicates an increased occurrence of Cnidaria since 2002. In the years 2007 and 2008, outbreaks of the warm-temperate scyphomedusa, Pelagia noctiluca, appeared in CPR samples between 45°N to 58°N and 1°W to 26°W. Knowing the biology of this species and its occurrence in the adjacent Mediterranean Sea, we suggest that P. noctiluca may be exploiting recent hydroclimatic changes in the northeast Atlantic to increase its extent and intensity of outbreaks. In pelagic ecosystems, Cnidaria can affect fish recruitment negatively. Since P. noctiluca is a highly venomous species, outbreaks can also be detrimental to aquaculture and make bathing waters unusable, thus having profound ecological and socio-economic consequences. [less ▲]

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See detailComparison of mesozooplankton faecal pellet characteristics from the Southern North Sea and the Mediterranean Sea during spring bloom conditions
Frangoulis, Constantin; Hecq, Jean-Henri ULg

in Gislason, Astthor; Gorsky, Gabriel (Eds.) Proceedings of the « Joint ICES / CIESM Workshop to Compare Zooplankton Ecology and Methodologies between the Mediterranean and the North Atlantic (WKZEM) » (2010, February)

Mesozooplankton faecal pellets participate in the carbon and nutrient cycles, in the nutrition of marine organisms, and in the transport of toxins, pollutants, and sediments. The importance of this role ... [more ▼]

Mesozooplankton faecal pellets participate in the carbon and nutrient cycles, in the nutrition of marine organisms, and in the transport of toxins, pollutants, and sediments. The importance of this role depends on their nature and production, which are highly variable parameters that, in turn, depend on many factors. For example, a phytoplankton bloom may significantly change the nature of mesozooplankton faecal pellets because it affects their shape, content, density, and volume. The aim of the present study is to compare the eutrophic Southern North Sea and the oligotrophic Bay of Calvi in the Meditenanean Sea with respect to the seasonal variability of faecal pellet characteristics (shape, size, sinking speed, density) during bloom conditions. [less ▲]

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