Consulta: creatorFacets:"Harmelin-vivien, Mireille"
Registros recuperados: 22
Data/hora: 05/06/2024 16:15:33

Patterns of trace metal bioaccumulation and trophic transfer in a phytoplankton-zooplankton-small pelagic fish marine food web
Provedor de dados: 5
Autores: Chouvelon, Tiphaine; Strady, Emilie; Harmelin-vivien, Mireille; Radakovitch, Olivier; Brach-papa, Christophe; Crochet, Sylvette; Knoery, Joel; Rozuel, Emmanuelle; Thomas, Bastien; Tronczynski, Jacek; Chiffoleau, Jean-francois.
Trace metal contamination in the European sardine and anchovy food web was investigated in the Gulf of Lions, NW Mediterranean Sea, including seawater and size fractions of plankton. The results highlighted: i) higher and more variable concentrations in the smaller plankton size classes for all metals except cadmium; ii) higher concentrations in anchovy versus sardine for all elements except lead; iii) different patterns of metal bioaccumulation through the food web: cobalt, nickel, copper, silver, lead and zinc displayed continuously decreasing concentrations (with the exception of increased zinc in fish only), while mercury concentrations dropped considerably in larger plankton size classes and rose significantly in fish. Lastly, cadmium concentrations...
Tipo: Text
Palavras-chave: Inorganic elements; Seawater; Size-classed plankton; Sardina pilchardus; Engraulis encrasicolus; Mediterranean Sea.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00511/62286/67906.pdf

Seasonal and plant-part isotopic and biochemical variation in Posidonia oceanica
Provedor de dados: 5
Autores: Cresson, Pierre; Boudouresque, Charles François; Ruitton, Sandrine; Casalot, Laurie; Verlaque, Marc; Harmelin-vivien, Mireille.
Posidonia oceanica is an iconic and highly productive Mediterranean seagrass. As most studies have focused on the fate of its production, temporal and plant part-specific variations of isotopic composition and biochemical content were overlooked. Combined seasonal and plant-part stable isotope composition and biochemical concentrations were measured at the lower depth limit of a P. oceanica meadow (~ 25 meter depth), and explained on the basis of previous knowledge of the specific metabolic functioning of each part. The predominance of compounds with complex chemical structure was reflected by the high concentrations of insoluble carbohydrates, high C/N ratios and high ä13C values. Plant parts clustered in 3 groups with similar isotopic or biochemical...
Tipo: Text
Palavras-chave: Posidomia oceanica; Mediterranean Sea; Stable isotopes; Biochemical composition.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00505/61640/65566.pdf

Trophic ecology of the European Hake in the Gulf of Lions, Northwestern Mediterranean Sea
Provedor de dados: 5
Autores: Mellon, Capucine; Harmelin-vivien, Mireille; Metral, Luisa; Loizeau, Veronique; Mortreux, Serge; Roos, David; Fromentin, Jean-marc.
The European hake, Merluccius merluccius, is an important resource for Mediterranean fisheries. This study focuses on juvenile and adult hake feeding ecology in the Gulf of Lions, using information from scientific surveys carried out during two seasons and three years (2004-2006). Stomach content and stable isotope (ä15N, ä13C) analyses were performed, and the main factors explaining variations in ä15N were investigated using GLMs. In the Gulf of Lions, hake mostly fed on crustaceans and fish and a dominant piscivorous regime was reached at 15 cm total length. Pelagic fish (sardine, anchovy and small blue whiting) were the main source of prey (40%-80%) and cannibalism was low (&lt;5%). The results confirmed that hake is an opportunistic feeder and also...
Tipo: Text
Palavras-chave: Foodweb; GLM; Habitat; Merluccius merluccius; Predator-prey relationships; Stable isotopes; Stomach contents.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00360/47091/47016.pdf

Differential biomagnification of PCB, PBDE, Hg and Radiocesium in the food web of the European hake from the NW Mediterranean
Provedor de dados: 5
Autores: Harmelin-vivien, Mireille; Bodiguel, Xavier; Charmasson, Sabine; Loizeau, Veronique; Mellon, Capucine; Tronczynski, Jacek; Cossa, Daniel.
Consumption of marine organisms represents one of the main exposure sources of contaminants for human populations. To obtain a global view of the contamination in commercial fish in the NW Mediterranean Sea, we analysed four types of priority contaminants (PCBs, PBDEs, Hg and Cs-137) in the European hake, Merluccius merluccius, from the Gulf of Lions in relation with organism's trophic level (delta N-15). All contaminants presented a significant increase in concentration in hake muscle with trophic level. However, obvious differences between contaminants were evidenced. Biomagnification factors (BMF and FWMF) along the hake food web were higher for Hg and CB-153 than for BDE-47 and Cs-137, and increase in contaminant concentration with trophic level...
Tipo: Text
Palavras-chave: Persistent organic pollutants; Mercury; Cs-137; Merluccius merluccius; Mediterranean.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00085/19583/17484.pdf

Functional traits unravel temporal changes in fish biomass production on artificial reefs
Provedor de dados: 5
Autores: Cresson, Pierre; Le Direach, Laurence; Rouanet, Elodie; Goberville, Eric; Astruch, Patrick; Ourgaud, Mélanie; Harmelin-vivien, Mireille.
Artificial reefs (ARs) are deployed worldwide as they are expected to support fisheries management. While the underlying mechanisms remain widely debated, production was recently determined as the most probable cause of increases in fish biomass. Changes in fish biomass in a temperate AR system were investigated from December 2008 to November 2015 by considering seven distinct functional groups, and isotopic functional indices were used to identify how these changes may have affected organic matter (OM) fluxes. Contrasting patterns of change were observed between functional trophic groups, highlighting that combining the biomass of all species present in a community is inappropriate for assessing AR-induced effects. Benthic sedentary species predominated...
Tipo: Text
Palavras-chave: Artificial reefs; Mediterranean sea; Fish biomass production; Isotopic functional indices.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00484/59577/62566.pdf

Rare Species Support Vulnerable Functions in High-Diversity Ecosystems
Provedor de dados: 5
Autores: Mouillot, David; Bellwood, David R.; Baraloto, Christopher; Chave, Jerome; Galzin, Rene; Harmelin-vivien, Mireille; Kulbicki, Michel; Lavergne, Sebastien; Lavorel, Sandra; Mouquet, Nicolas; Paine, C. E. Timothy; Renaud, Julien; Thuiller, Wilfried.
Around the world, the human-induced collapses of populations and species have triggered a sixth mass extinction crisis, with rare species often being the first to disappear. Although the role of species diversity in the maintenance of ecosystem processes has been widely investigated, the role of rare species remains controversial. A critical issue is whether common species insure against the loss of functions supported by rare species. This issue is even more critical in species-rich ecosystems where high functional redundancy among species is likely and where it is thus often assumed that ecosystem functioning is buffered against species loss. Here, using extensive datasets of species occurrences and functional traits from three highly diverse ecosystems...
Tipo: Text
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00144/25506/60251.pdf

Contrasting perception of fish trophic level from stomach content and stable isotope analyses: A Mediterranean artificial reef experience
Provedor de dados: 5
Autores: Cresson, Pierre; Ruitton, Sandrine; Ourgaud, Melanie; Harmelin-vivien, Mireille.
A large complex of artificial reefs was deployed in the Bay of Marseilles, North-Western Mediterranean, for the enhancement of commercial fisheries stocks. Carbon and nitrogen stable isotope and stomach content analyses were performed on 23 fish species collected on the artificial reefs to assess their trophic position and feeding behaviour. Results indicated that fish diets were not modified on the artificial reefs compared to natural environments, nor was the structure of their trophic network. Artificial reefs, with their complex design, provide diverse and abundant food sources for fishes. Ranges of delta C-13 and delta N-15 of artificial reef fishes were comparable to those recorded in natural Mediterranean environments, with a similar trophic...
Tipo: Text
Palavras-chave: Artificial reefs; Fish diet; NW Mediterranean; Stable isotopes; Stomach content; Trophic level.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00186/29708/28188.pdf

Liste des poissons côtiers de Polynésie française
Provedor de dados: 5
Autores: Siu, Gilles; Bacchet, Philippe; Bernardi, Giacomo; Brooks, Andrew J.; Carlot, Jeremy; Causse, Romain; Claudet, Joachim; Clua, Eric; Delrieu-trottin, Erwan; Espiau, Benoit; Harmelin-vivien, Mireille; Keith, Philippe; Lecchini, David; Madi-moussa, Rakamaly; Parravicini, Valeriano; Planes, Serge; Ponsonnet, Cedric; Randall, John E.; Sasal, Pierre; Taquet, Marc; Williams, Jeffrey T.; Galzin, Rene.
On the occasion of the 10th Indo-Pacific Fish Conference (http://ipfc10.criobe.pf/) to be held in Tahiti in October 2017, it seemed timely to update Randall's 1985 list of the fishes known from French Polynesia. Many studies focusing on fishes in this area have been published since 1985, but Randall's list remains the authoritative source. Herein we present an expanded species list of 1,301 fishes now known to occur in French Polynesia and we review the expeditions and information sources responsible for the over 60% increase in the number of known species since the publication of Randall's checklist in 1985. Our list of the fishes known from French Polynesia includes only those species with a reliably verifiable presence in these waters. In cases where...
Tipo: Text
Palavras-chave: Coral reef fishes; Deep and Pelagic fishes; Freshwater fishes; French Polynesia; Endemic fishes; Inventory.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00666/77826/80005.pdf

Feeding strategies and resource partitioning mitigate the effects of oligotrophy for marine cave mysids
Provedor de dados: 5
Autores: Rastorgueff, Pierre-alexandre; Harmelin-vivien, Mireille; Richard, Pierre; Chevaldonne, Pierre.
We investigated how large populations of several mysid species can coexist in oligo trophic underwater marine caves and their relationships in the marine cave food web using carbon and nitrogen stable isotopes. Isotopic signatures indicate food partitioning among the 5 species of cave-dwelling mysids from the northwest Mediterranean Sea we studied. Hemimysis speluncola feeds mainly on phytoplankton and zooplankton from outside the caves, Siriella gracilipes on sedimentary organic matter and zooplankton from outside, Harmelinella mariannae on small cave-dwelling crustaceans, and Hemimysis margalefi and Hemimysis lamornae mediterranea on sedimentary particulate organic matter. These differences in diet could promote coexistence of such diverse and abundant...
Tipo: Text
Palavras-chave: Trophic ecology; Resource partitioning; Mysidacea; Marine caves; Oligotrophy; Stable isotopes; NW Mediterranean.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00372/48307/48426.pdf

Mercury in blue shark ( Prionace glauca ) and shortfin mako ( Isurus oxyrinchus ) from north-eastern Atlantic: Implication for fishery management
Provedor de dados: 5
Autores: Biton-porsmoguer, Sebastian; Banaru, Daniela; Boudouresque, Charles F.; Dekeyser, Ivan; Bouchoucha, Marc; Marco-miralles, Francoise; Lebreton, Benoit; Guillou, Gael; Harmelin-vivien, Mireille.
Pelagic sharks (blue shark Prionace glauca and shortfin mako Isurus oxyrinchus) caught by long-line Spanish and Portuguese fleets in the NE Atlantic, were sampled at Vigo fish market (Spain) for total mercury (Hg) analysis. Hg concentration in white muscle increased with size and weight in both species, but at a higher rate in shortfin mako than in the blue shark. No difference was found with sex, year and season. Spatial variation was observed in the blue shark with higher Hg values in the North of the Azorean archipelago, but not in the shortfin mako. These high-level predators are particularly susceptible to bioaccumulate contaminants (Hg) in their tissues (muscle). However, a significant positive relationship between Hg concentration and trophic level...
Tipo: Text
Palavras-chave: Mercury; Pelagic sharks; Blue shark; Shortfin mako; Long-line fishery; NE Atlantic.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00413/52492/56296.pdf

Seasonal variation of stable isotope ratios of size-fractionated zooplankton in the Bay of Marseille (NW Mediterranean Sea)
Provedor de dados: 5
Autores: Banaru, Daniela; Carlotti, Francois; Barani, Aude; Gregori, Gerald; Neffati, Nada; Harmelin-vivien, Mireille.
Stable isotope ratios of six size fractions of zooplankton (80 to &gt;2000 mm) were analyzed seasonally in 2009-2010 at the SOMLIT site in the Bay of Marseille. Isotopic ratios generally increased with zooplankton size. The highest delta N-15 values were observed in the 1000-2000 mm fraction. The largest size class (&gt;2000 mu m), dominated by gelatinous plankton, had lower delta N-15 values due to the low isotopic signatures of most of these organisms. In the larger size fractions (&gt;1000 mu m), isotopic ratios were measured at the taxon level. Brachyuran, stomatopod, teleost and cephalopod larvae showed the highest delta N-15 values, and salps and pteropods the lowest ones. Lower values of both delta C-13 and delta N-15 were recorded in winter and...
Tipo: Text
Palavras-chave: Plankton; Delta C-13; Delta N-15; Size classes; Flow cytometry.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00372/48275/48536.pdf

The Great Melting Pot. Common Sole Population Connectivity Assessed by Otolith and Water Fingerprints
Provedor de dados: 5
Autores: Morat, Fabien; Letourneur, Yves; Dierking, Jan; Pecheyran, Christophe; Bareille, Gilles; Blamart, Dominique; Harmelin-vivien, Mireille.
Quantifying the scale and importance of individual dispersion between populations and life stages is a key challenge in marine ecology. The common sole (Solea solea), an important commercial flatfish in the North Sea, Atlantic Ocean and the Mediterranean Sea, has a marine pelagic larval stage, a benthic juvenile stage in coastal nurseries (lagoons, estuaries or shallow marine areas) and a benthic adult stage in deeper marine waters on the continental shelf. To date, the ecological connectivity among these life stages has been little assessed in the Mediterranean. Here, such an assessment is provided for the first time for the Gulf of Lions, NW Mediterranean, based on a dataset on otolith microchemistry and stable isotopic composition as indicators of the...
Tipo: Text
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00284/39483/37973.pdf

Algal food processing by Stegastes nigricans, an herbivorous damselfish: differences between an undisturbed and a disturbed coral reef site (La Reunion, Indian Ocean)
Provedor de dados: 5
Autores: Lison De Loma, Thierry; Harmelin-vivien, Mireille; Naim, Odile; Fontaine, Marie France.
There has, as yet, been little study of nutrient disturbance and its consequences on the functional biology of primary consumers in coral reefs. The processing of epilithic algal communities by the damselfish Stegastes nigricans was investigated at La Reunion, at two sites of a fringing reef, oligotrophic for one and eutrophic for the other. Differences between sites were analyzed in quantifying organic matter, organic carbon, nitrogen, and organic 'nutrients' (carbohydrate, lipid and protein) in the algal food, the digestive contents and the faeces of S. nigricans. In the disturbed site, algal turfs and digestive contents presented significantly higher organic matter, organic carbon, nitrogen and organic nutrient values. Absorption efficiency of total...
Tipo: Text
Palavras-chave: Régime herbivore; Stegastes; Récif corallien; Eutrophisation; La Réunion; Herbivory; Stegastes; Coral reef; Eutrophication; La Reunion.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43376/42835.pdf

Delineating reef fish trophic guilds with global gut content data synthesis and phylogeny
Provedor de dados: 5
Autores: Parravicini, Valeriano; Casey, Jordan M.; Schiettekatte, Nina M. D.; Brandl, Simon J.; Pozas-schacre, Chloé; Carlot, Jérémy; Edgar, Graham J.; Graham, Nicholas A. J.; Harmelin-vivien, Mireille; Kulbicki, Michel; Strona, Giovanni; Stuart-smith, Rick D.
Understanding species’ roles in food webs requires an accurate assessment of their trophic niche. However, it is challenging to delineate potential trophic interactions across an ecosystem, and a paucity of empirical information often leads to inconsistent definitions of trophic guilds based on expert opinion, especially when applied to hyperdiverse ecosystems. Using coral reef fishes as a model group, we show that experts disagree on the assignment of broad trophic guilds for more than 20% of species, which hampers comparability across studies. Here, we propose a quantitative, unbiased, and reproducible approach to define trophic guilds and apply recent advances in machine learning to predict probabilities of pairwise trophic interactions with high...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00688/79980/82934.pdf

Hierarchical drivers of reef-fish metacommunity structure
Provedor de dados: 5
Autores: Macneil, M. Aaron; Graham, Nicholas A. J.; Polunin, Nicholas V. C.; Kulbicki, Michel; Galzin, Rene; Harmelin-vivien, Mireille; Rushton, Steven P.
Coral reefs are highly complex ecological systems, where multiple processes interact across scales in space and time to create assemblages of exceptionally high biodiversity. Despite the increasing frequency of hierarchically structured sampling programs used in coral-reef science, little progress has been made in quantifying the relative importance of processes operating across multiple scales. The vast majority of reef studies are conducted, or at least analyzed, at a single spatial scale, ignoring the implicitly hierarchical structure of the overall system in favor of small-scale experiments or large-scale observations. Here we demonstrate how alpha (mean local number of species), beta diversity (degree of species dissimilarity among local sites), and...
Tipo: Text
Palavras-chave: Alpha; Beta; And gamma diversity biodiversity coral reefs ecological scales habitat structure mixed-effects models multiple working hypotheses; Reef-fish biomass species abundance species richness.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00207/31782/30195.pdf

Food web structure of a Mediterranean coralligeneous ecosystem
Provedor de dados: 5
Autores: Belloni, Bruno; Sartoretto, Stephane; Cresson, Pierre; Bouchoucha, Marc; Guillou, Gael; Lebreton, Benoit; Ruitton, Sandrine; Harmelin-vivien, Mireille.
The coralligenous ecosystem is one of the biodiversity hotspots in the Mediterranean Sea. This study aims at determining (i) the organic matter (OM) sources at the base of the food web in a coralligenous  ecosystem  near  Marseille  (Cap  Caveau,  Frioul  Island)  and  (ii)  the  global functional structure of its community. For that purpose, C and N stable isotope analyses were performed on 78 compartments or species collected in this habitat between 30 and 40 m depth. Results  suggested  that  the  pelagic  particulate  organic  matter  (POM),  mainly  composed  of phytoplankton, was the main OM source fuelling coralligenous food webs, followed by sedimented organic matter (SOM) and some macrophytes. At least three level of consumers were identified from...
Tipo: Text
Palavras-chave: Food webs; Coralligenous ecosystem; Stable isotopes; Carbon; Nitrogen.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00483/59511/62396.pdf

210Po and 210Pb trophic transfer within the phytoplankton–zooplankton–anchovy/sardine food web: a case study from the Gulf of Lion (NW Mediterranean Sea)
Provedor de dados: 5
Autores: Strady, Emilie; Harmelin-vivien, Mireille; Chiffoleau, Jean-francois; Veron, Alain; Tronczynski, Jacek; Radakovitch, Olivier.
The transfer of 210Po and 210Pb in the food web of small pelagic fishes (from phytoplankton and zooplankton to anchovy Engraulis encrasicolus and sardine Sardina pilchardus) is investigated in the Gulf of Lion (GoL). We present original data of 210Po and 210Pb activity concentrations, C and N stable isotope ratios, measured (i) from different size classes of phytoplankton and zooplankton during spring and winter in different environments of the GoL, and (ii) in two fish species. Significant spatial patterns based on 210Po, 210Pb activity concentrations and 210Po/210Pb ratios in the different plankton size classes are evidenced by hierarchical clustering, both in spring and winter. This variability, also observed for C and N stable isotopes ratios, is...
Tipo: Text
Palavras-chave: Po-210; Pb-210; Phytoplankton; Zooplankton; Pelagic fishes; Mediterranean Sea.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00255/36609/35264.pdf

Feeding strategies of co-occurring suspension feeders in an oligotrophic environment
Provedor de dados: 5
Autores: Cresson, Pierre; Ruitton, Sandrine; Harmelin-vivien, Mireille.
Suspension-feeders predominate in the vast majority of the coastal marine benthic ecosystems, with several species co-occurring at low spatial scale. Understanding how these species cope with competition for trophic resources has been the core of numerous studies, mostly in coastal shallow systems where food supplies are diverse and abundant. Oligotrophic systems have received less attention. The aim of the present study was thus to investigate the trophic relationships established between 9 suspension feeders collected in an oligotrophic zone (Bay of Marseille, French Mediterranean). Species displayed similar isotopic ratios, consistently with the use of one main source, identified as nanophytoplankton and diazotrophic bacteria as the δ15N values were...
Tipo: Text
Palavras-chave: Suspension feeders; Isotopic niche; Mediterranean; Oligotrophy; Resource sharing mechanisms.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00301/41203/40363.pdf

Distributions of Indo-Pacific lionfishes Pterois spp. in their native ranges: implications for the Atlantic invasion
Provedor de dados: 5
Autores: Kulbicki, Michel; Beets, James; Chabanet, Pascale; Cure, Katherine; Darling, Emily; Floeter, Sergio R.; Galzin, Rene; Green, Alison; Harmelin-vivien, Mireille; Hixon, Mark; Letourneur, Yves; De Loma, Thierry Lison; Mcclanahan, Tim; Mcilwain, Jennifer; Moutham, Gerard; Myers, Robert; O'Leary, Jennifer K.; Planes, Serge; Vigliola, Laurent; Wantiez, Laurent.
Lionfish (Pterois volitans and P. miles) have become a major concern in the western Attantie and Caribbean since their introduction in the 1980s. Invasive lionfish can reach very high population densities on coral reefs in their invaded range, yet there are few data from their native range in the Indo-Pacific for comparison. We compiled data on the geographical distribution and density of Indo-Pacific lionfishes in their native ranges from published and unpublished underwater visual censuses and field collections. We found that lionfish in their native Indo-Pacific range are unevenly distributed, with higher densities in the Indian Ocean than in the Pacific. Lionfish densities increase significantly with increasing latitude, and are significantly higher in...
Tipo: Text
Palavras-chave: Pterois; Indo-Pacific; Ecology; Visual census; Larvae; Invasive species.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00207/31781/30193.pdf

PCB concentrations in plankton size classes, a temporal study in Marseille Bay, Western Mediterranean Sea
Provedor de dados: 5
Autores: Tiano, Marion; Tronczynski, Jacek; Harmelin-vivien, Mireille; Tixier, Celine; Carlotti, Francois.
PCB levels in plankton were investigated in the Bay of Marseille, Western Mediterranean Sea, between September 2010 and October 2011. Concentrations of PCB congeners (CB 18, CB 52, CB 101, CB 118, CB 138, CB 153, CB 180) were determined in three plankton size-classes (60–200, 200–500 and 500–1000 μm) together with different parameters: chlorophyll content, plankton dry-weight biomass, carbon and nitrogen stable isotope ratios and plankton-community structure. The ∑PCB7 concentrations ranged between 14.2 and 88.1 ng g−1 d.w., for all size classes and all sampling periods. The results do not show the biomass dilution effect and indicate moderate but significant biomagnification with plankton trophic position estimated by δ15N signatures. Equilibrium with...
Tipo: Text
Palavras-chave: PCBs; Phytoplankton; Zooplankton; Bioaccumulation; Coastal; Bay of Marseille.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00218/32881/31371.pdf

Trophic relationships between the farmed pearl oyster Pinctada margaritifera and its epibionts revealed by stable isotopes and feeding experiments
Provedor de dados: 5
Autores: Lacoste, Elise; Raimbault, Patrick; Harmelin-vivien, Mireille; Gaertner-mazouni, Nabila.
Bivalve cultures support a host of epibionts, mainly suspension feeders, which can compete for food resources with the cultivated bivalves. However, the magnitude of interspecific competition for food in bivalve aquaculture settings remains inconclusive, especially in tropical areas. We investigated the interactions for food between the farmed pearl oyster Pinctada margaritifera and its epibionts, using stable isotope analysis and feeding experiments. Inter-and intraspecific variations of delta C-13 and delta N-15 stable isotope ratios (SIRs) were determined for oysters in the presence or absence of epibionts. The diet of the most abundant epibionts, Herdmania momus and Didemnum sp., was specified using isotope measurements and flow cytometry during...
Tipo: Text
Palavras-chave: Ascidian; Biofouling; Trophic interactions; Stable isotope; Flow cytometry.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00664/77582/79564.pdf

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