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Vanina Pasqualini - One of the best experts on this subject based on the ideXlab platform.
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Sea urchin–seagrasses interactions: trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m^−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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sea urchin seagrasses interactions trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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Sea urchin and seagrasses: trophic relationships in a benthic ecosystem from a Coastal Lagoon.
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6-18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10-98 ind. m-2 were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
Catherine Fernandez - One of the best experts on this subject based on the ideXlab platform.
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Sea urchin–seagrasses interactions: trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m^−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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sea urchin seagrasses interactions trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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Sea urchin and seagrasses: trophic relationships in a benthic ecosystem from a Coastal Lagoon.
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6-18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10-98 ind. m-2 were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
Lila Ferrat - One of the best experts on this subject based on the ideXlab platform.
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Sea urchin–seagrasses interactions: trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m^−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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sea urchin seagrasses interactions trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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Sea urchin and seagrasses: trophic relationships in a benthic ecosystem from a Coastal Lagoon.
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6-18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10-98 ind. m-2 were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
Gérard Pergent - One of the best experts on this subject based on the ideXlab platform.
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Sea urchin–seagrasses interactions: trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m^−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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sea urchin seagrasses interactions trophic links in a benthic ecosystem from a Coastal Lagoon
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6–18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10–98 ind. m−² were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
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Sea urchin and seagrasses: trophic relationships in a benthic ecosystem from a Coastal Lagoon.
Hydrobiologia, 2012Co-Authors: Catherine Fernandez, Lila Ferrat, Gérard Pergent, Vanina PasqualiniAbstract:Seagrasses could constitute a major component of lagunal ecosystems. Generally, in seagrass beds, consumer control is strong. In Coastal Lagoons, where seagrass beds are particularly extensive, there is only scarce data on seagrass herbivory. In Mediterranean Coastal Lagoons, Paracentrotus lividus populations are extensive and consume Cymodocea nodosa beds. In this study, we monitored a P. lividus population during 18 months in order to analyse changes in population density and structure. On the basis of results of previous studies (i.e. biomass, density, production and nutrition parameters), we assessed the importance of P. lividus with respect to C. nodosa herbivory in a Mediterranean Coastal Lagoon. The results show that this sea urchin, when its density is low, is estimated to consume about 0.6-18.9% of the seagrass production. However, active movement of consumers among adjacent habitats influences nutrient fluxes. During sea urchin migration, when densities of 10-98 ind. m-2 were observed, the consumption rates in sea urchin feeding fronts temporarily exceeded seagrass production rates. The overgrazing of the C. nodosa results in patches where leaves of this plant are completely consumed, and this phenomenon may explain a part of interannual variations in the distribution pattern of this species.
Gauthier Schaal - One of the best experts on this subject based on the ideXlab platform.
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Different particle sources in a bivalve species of a Coastal Lagoon: evidence from stable isotopes, fatty acids, and compound-specific stable isotopes
Marine Biology, 2019Co-Authors: Margaux Mathieu-resuge, Edouard Kraffe, Gauthier Schaal, Rudolph Corvaisier, Oanez Lebeau, Salvador Lluch-cota, Rosa Salgado García, Martin Kainz, Fabienne Le GrandAbstract:The trophic fate of various food sources is of central interest for ecologists, yet not well understood in Coastal Lagoon food webs. In this field study, fatty acids (FA), stable isotopes (SI), and compound-specific isotopic analysis (CSIA) on FA were used to investigate how diets from oceanic and local sources are retained in a bivalve species (Spondylus crassisquama; Lamarck 1819) along a transect in the Ojo de Liebre Lagoon (BCS, Mexico). Results from SI and FA indicated the contribution of oceanic diatoms at the entrance of the Lagoon, through 15N enrichment, and higher proportions of 16:1n-7 and 20:5n-3 in digestive glands. In the inner bay, higher abundance of 18-carbon FA (18:1n-9, 18:3n-3, 18:4n-3) suggested a higher contribution of microheterotrophs, including (dino)flagellates and ciliates, to the diet of this bivalve derived from local production. Significant spatial differences for the δ13C of FA highlighted changes in the origin of food sources. Indeed, a 13C depletion was observed in the δ13C of heterotrophic flagellates biomarkers in individuals from the innermost station, revealing that their origin in the diet of bivalves differs within the Lagoon, highlighting the importance of local processes (sediment resuspension, remineralization) in the trophic functioning of the Lagoon. The δ13C values of FA considered as diatoms biomarkers (16:1n-7 and 20:5n-3) were consistent, which suggests that diatoms assimilated have very similar origins throughout the Lagoon. The complementary of the tracers used here allowed for a better understanding of the trophic functioning of this Coastal Lagoon submitted to oceanic influences.
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trophic ecology of suspension feeding bivalves inhabiting a north eastern pacific Coastal Lagoon comparison of different biomarkers
Marine Environmental Research, 2019Co-Authors: Margaux Mathieuresuge, Edouard Kraffe, Fabienne Le Grand, Andy Boens, Antoine Bideau, Salvador E Lluchcota, Ilie S Racotta, Gauthier SchaalAbstract:Abstract Understanding the nature and origins of food sources supporting Coastal Lagoon-inhabiting organisms is necessary to evaluate the ecological status of such ecosystems. The trophic ecology of a bivalve species Spondylus crassisquama was studied in the Ojo de Liebre Lagoon (Baja California, Mexico), combining stable isotope (SI), fatty acid (FA) and sterol analyses along a transect under oceanic influences. The second objective of the study was to investigate if sterol compositions give complementary information to those obtained from FA and SI. Temporal and spatial patterns of the three biomarkers in bivalve tissues suggest oceanic inputs at the mouth of the Lagoon, while the inner station was characterized by a contribution of local sources including an important role of micro heterotrophs. This study revealed that the association of lipid biomarkers provide higher taxonomic resolution of the spatiotemporal heterogeneity in nutrient sources influencing the trophic functioning of a large Coastal Lagoon.