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Registros recuperados: 6
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Chronic and severe hypoxic conditions in Paracas Bay, Pisco, Peru: Consequences on scallop growth, reproduction, and survival 5
Aguirre-velarde, Arturo; Thouzeau, Gerard; Jean, Frederic; Mendo, Jaime; Cueto-vega, Rosa; Kawazo-delgado, Midori; Vásquez-spencer, Jazmín; Herrera-sanchez, Diego; Vega-espinoza, Alex; Flye-sainte-marie, Jonathan.
The response of Argopecten purpuratus (Peruvian scallop) to environmental conditions was studied in the upwelling-influenced Bay of Paracas (Peru). Scallops growth and reproduction were monitored weekly over a 7-month period under two conditions (culture depths): on the bottom and 2 m above (suspended culture). At the same time, a high-frequency environmental monitoring was realized at the aforementioned depths. The results indicate that environmental conditions in the Bay are highly variable, especially during the summer: temperature fluctuations up to 8∘C were recorded in less than one day while oxic conditions ranged from oversaturation to anoxia. Milky-turquoise waters discoloration events (sulphide presence suspected) were simultaneously observed...
Tipo: Text Palavras-chave: Argopecten purpuratus; High frequency monitoring; Coastal upwelling; Hypoxic/anoxic conditions; Growth; Reproduction; Aquaculture; Milky-turquoise water/aguas Blancas.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00504/61547/65430.pdf
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Le projet ANR-COMANCHE 2010-STRA-010. Interactions écosystémiques et impacts anthropiques dans les populations de COquilles Saint-Jacques (Pecten maximus) de la MANCHE. Rapport scientifique final 5
Foucher, Eric; Blanchard, Michel; Cugier, Philippe; Desroy, Nicolas; Dreanno, Catherine; Fauchot, Juliette; Fifas, Spyros; Guyader, Olivier; Jean, Frederic; Le Gallic, Bertrand; Riou, Philippe; Schapira, Mathilde; Thiebaut, Eric.
The King scallop Pecten maximus constitutes the first landed species in terms of tonnage and the second or third one in terms of value for the French fisheries. More than 90% of these landings come from the English Channel indicating that its exploitation is essential to local fleets. The COMANCHE project (Ecosystem Interactions and anthropogenic impacts on King scallops populations in the English Channel) proposed to improve the knowledge of the scallop within the Channel, through an ecosystem-based approach for fisheries, appealing to a wide range of scientific disciplines (physics, chemistry, genetics, ecology, geostatistics, modeling, economics ....). Researches on the spatial location of scallop beds, connectivity by larval dispersal between beds,...
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00251/36236/34797.pdf
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Quantitative sampling of soft-bottom macroepifauna for assessing the benthic system in the bay of brest (france) 5
Jean, Frederic; Hilly, C.
Macroepifauna of mixed sediments was quantitatively studied at three stations in the Bay of Brest. Samples were collected with the quantitative video dredge Aquareve II. Sampling performance varied from 6.1 to 55.6 m2 according to the mesh diameter of the net (10, 40, and 70 mm) and the quality and quantity of the hard structures lying on the bottom. The efficiency of the different sampling options is tested. The ecological analysis shows differences between epifaunal assemblages, which are mainly explained by the characteristics of the ruggedness in each station. Ruggedness is defined in terms of quality and quantity of hard structures (pebbles, gravel, shells, coraline algae and macroalgae) lying on the sediment surface. Hard substrates act as...
Tipo: Text Palavras-chave: EPIBENTHOS; SAMPLING METHOD; QUANTITATIVE DISTRIBUTION; MICROHABITATS; TROPHIC WEB.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00098/20894/18508.pdf
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Reproductive strategy of the invasive green mussel may result in increased competition with native fauna in the southeastern United States 5
Mcfarland, Katherine; Soudant, Philippe; Jean, Frederic; Volety, Aswani K..
Understanding the population dynamics of invasive species, such as the green mussel Perna viridis (Linnaeus, 1758), can aid in explaining the success of newly introduced populations and help predict the potential for spread. During a two-year field study of established populations in the invaded region of southwest Florida, year round gametogenesis and continuous spawning capabilities were observed through histological analysis of mussels collected monthly. This was supported by overall stable energetic reserves as measured through proximal biochemical composition (protein, glycogen and lipid content). However, egg outputs in the summer (6.4 x 10(6) +/- 2.6 x 10(6) eggs / female) were significantly higher than egg outputs of winter-spawned mussels (7.7 x...
Tipo: Text Palavras-chave: Gametogenesis; Protein; Glycogen; Lipid; Induced spawning.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00616/72842/72974.pdf
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Size‐based survival of cultured Argopecten purpuratus (L, 1819) under severe hypoxia 5
Cueto‐vega, Rosa; Flye‐sainte‐marie, Jonathan; Aguirre‐velarde, Arturo; Jean, Frederic; Gil‐kodaka, Patricia; Thouzeau, Gerard.
During recent years, mass mortalities of cultured scallops became more frequent in Peruvian bays. One of the main drivers related to these mortalities was hypoxic events. This study was designed to understand the hypoxia phenomenon in these bays and to assess how the Peruvian scallop, Argopecten purpuratus, can cope with reduced oxygen levels in seawater based on individual size. First, we analyzed the relationships between dissolved oxygen saturation and other environmental parameters (the Coastal El Niño Index, temperature, salinity and pH) in bottom seawater, the frequency and intensity of hypoxic events in two main culture areas (Sechura and Paracas Bays), and their relationship with scallop mass mortalities. Then, we performed experiments with two...
Tipo: Text Palavras-chave: Argopecten purpuratus; Lt50; Mass mortality; Severe hypoxia; Size effect.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00692/80410/83521.pdf
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The Impossible Sustainability of the Bay of Brest? Fifty Years of Ecosystem Changes, Interdisciplinary Knowledge Construction and Key Questions at the Science-Policy-Community Interface 5
Ragueneau, Olivier; Raimonet, Melanie; Maze, Camille; Coston-guarini, Jennifer; Chauvaud, Laurent; Danto, Anatole; Grall, Jacques; Jean, Frederic; Paulet, Yves-marie; Thouzeau, Gerard.
In this contribution, the study of the Bay of Brest ecosystem changes over the past 50 years is used to explore the construction of interdisciplinary knowledge and raise key questions that now need to be tackled at the science-policy-communities interface. The Bay of Brest is subject to a combination of several aspects of global change, including excessive nutrient inputs from watersheds and the proliferation of invasive species. These perturbations strongly interact, affecting positively or negatively the ecosystem functioning, with important impacts on human activities. We first relate a cascade of events over these five decades, linking farming activities, nitrogen, and silicon biogeochemical cycles, hydrodynamics of the Bay, the proliferation of an...
Tipo: Text Palavras-chave: Sustainability; Land-ocean continuum; Bay of Brest; Interdisciplinarity; Science-policy-community interface.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00616/72792/72272.pdf
Registros recuperados: 6
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