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Registros recuperados: 8
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A comparative ecophysiological study of two infaunal filter-feeding bivalves: Paphia rhomboides and Glycymeris glycymeris ArchiMer
Savina, Marie; Pouvreau, Stephane.
A comparative ecophysiological study was carried out in September and November 2002 for two bivalves, Paphia rhomboides and Glycymeris glycymeris, which are significantly harvested in the Western Channel (French coast). Individual measurements of clearance and respiration rates were performed for both species, in several experimental conditions of temperature and phytoplankton concentrations. Those conditions were chosen to be in the range of those commonly observed in the subtidal area of the Western Channel. The mean value of clearance rate and oxygen consumption obtained from continuous data recording did not reveal any significant influence of temperature in the investigated range, but a significant difference between P rhomboides and G. glycymeris....
Tipo: Text Palavras-chave: Filter feeding; Bivalves; Glycymeris glycymeris; Paphia rhomboides; Scope for growth; Ecophysiology.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-379.pdf
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A deterministic population dynamics model to study the distribution of a benthic bivalve with planktonic larvae (Paphia rhomboides) in the English Channel (NW Europe) ArchiMer
Savina, Marie; Menesguen, Alain.
This paper describes the development of a modelling framework to study the distribution in the English Channel of a benthic bivalve with planktonic larvae, Paphia rhomboides. Age-structured population dynamics and growth models are linked together to a compartmental transport and NPZ (Nutrients-Phytoplankton-Zooplankton) model. Used in a spin-up mode, i.e. with identical environmental forcing from a year to the next, this deterministic model converges to the same steady state whatever the initial conditions, after 15-30 years of simulation. Important features of the P. rhomboides distribution are reproduced, particularly its high abundance in the GNB (Golfe Normand-Breton) and its almost complete absence in the Western Channel. The results are discussed in...
Tipo: Text Palavras-chave: Spatial distribution; Meroplanktonic invertebrates; Growth model; Population dynamics model; Paphia rhomboides; English Channel.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3718.pdf
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Atlantis Ecosystem Model Summit: Report from a workshop ArchiMer
Weijerman, M.; Link, J. S.; Fulton, E. A.; Olsen, E.; Townsend, H.; Gaichas, S.; Hansend, C.; Skern-mauritzen, M.; Kaplan, I. C.; Gamble, R.; Fay, G.; Savina, Marie; Ainsworth, C.; Van Putten, I.; Gorton, R.; Brainard, R.; Larsen, K.; Hutton, T..
Ecosystem models can be used to understand the cumulative impacts of human pressures and environmental drivers on ecosystem structure and dynamics. Predictive modeling can show how management can influence those dynamics and structures and the ecosystem services these systems provide. Many nations and intergovernmental organizations are advocating for ecosystem-based management, often with a specific emphasis to evaluate various future management strategies. Atlantis is an end-to-end ecosystem model that is well suited for this task and has so far been developed for more than 30 diverse marine ecosystems worldwide. To provide a better understanding of the current modeling work, elicit wider interest, and foster collaboration within the Atlantis community,...
Tipo: Text Palavras-chave: Ecosystem-based models; Atlantis Summit; Management; Strategy evaluation; Meeting report.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00335/44605/44471.pdf
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Evaluations locales des populations de bivalves dans le golfe de normand breton. Résultats de la campagne BIVALVES2002 ArchiMer
Pitel, Mathilde; Savina, Marie; Fifas, Spyros; Berthou, Patrick.
The exploited stocks of wild bivalves (common cockles, dog cockles, clams, and spisules) in the Norman-Breton gulf vary according to the fishing activity and the environmental conditions. Different studies, carried out by the Ifremer in this region (between 1982 and 1998), enabled the evaluation of the stocks available for fishing as well as the collection of data on these species (demographic structure, growth...). For more information on the 1993-1994 studies and a presentation of the site and the fishery please refer to the reports by Berthou, 1987 and Noël et al, 1995. The bivalve expedition conducted in May 2002, enabled us to update the data on the populations of dog cockles and banded carpet shells, then of spisules and clams, using the same...
Tipo: Text Palavras-chave: Bittersweet palourdi; Spisula; Clam; Brittany norman gulf; Bibalves; Brittany; Fishing; Crepidule; Amande de mer; Spisule; Praire; Palourde; Golfe normand breton; Bivalves; Bretagne; Pêche.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-4609.pdf
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Modélisation écologique des populations de palourdes roses (Paphia rhomboïdes) et d'amandes de mer (Glycymeris glycymeris) en Manche ArchiMer
Savina, Marie.
Diversity and abundance of the benthic fauna in the Channel Sea have favoured the development of fisheries, particularly those of shellfish (scallop, warty venus, common cockle, dog cockle, banded carpet shell, surf clam...) and also attracted the interest of scientists. Some large scientific programs were carried out in the seventies to study benthos distribution in this area. Among the main listed bivalves, the dog cockle (Glycymeris glycymeris) and the banded carpet shell (Paphia rhomboïdes) are particularly widespread in the Channel Sea and in the "Golfe Normand-Breton", where they are ones of the most abundant species in terms of biomass. In view of their halieutic interest and the existence of an important database describing their distribution,...
Tipo: Text Palavras-chave: Shellfish fisheries; Growth; Ecophysiology; Distribution of benthic invertebrates; Numerical ecological space distributed deterministic modelling; Glycymeris glycymeris; Paphia rhomboïdes; Golfe Normand Breton; Channel Sea; Exploitation des bivalves sauvages; Croissance; Ecophysiologie; Répartition des invertébrés benthiques; Modélisation numérique écologique spatialisée déterministe; Glycymeris glycymeris; Paphia rhomboïdes; Golfe Normand Breton; Manche.
Ano: 2004 URL: https://archimer.ifremer.fr/doc/2004/these-1.pdf
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Modelling ecological change over half a century in a subtropical estuary: impacts of climate change, land-use, urbanization and freshwater extraction ArchiMer
Condie, Scott A.; Hayes, Donna; Fulton, Elizabeth A.; Savina, Marie.
The Clarence River Estuary is the largest estuary in southeast Australia, with an extensive floodplain encompassing multiple river channels and a large coastal lagoon. It is the focus of major commercial and recreational fisheries and there is pressure to divert its freshwater inputs for agricultural and domestic uses. We used a spatial biogeochemical model to simulate the variability and evolution of this system on timescales from days to decades over the past half century. Like most tropical and subtropical estuaries, the Clarence River Estuary is strongly influenced by river discharge, sediment and nutrient loads. Given the high nutrient loads arriving from the upper catchment, plankton biomasses in the model were typically limited by flushing through...
Tipo: Text Palavras-chave: Coastal lagoon; Flushing; Land-use; Climate impacts; Nutrients; Phytoplankton; Zooplankton.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00175/28673/27113.pdf
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The growth of the banded carpet shell (Paphia rhomboides) in a contrasted region, the English Channel (Western Europe): A modelling study ArchiMer
Savina, Marie; Menesguen, Alain.
Paphia rhombofdes is an infaunal filter-feeding bivalve, particularly widespread and abundant in the English Channel. In order to investigate the influence of the growth-related post-settlement processes on its distribution, a spatial growth model was developed and linked to an existing ecological model of the English Channel. This model was partially parameterized on the basis of a specific ecophysiological experimental study, and calibrated with growth data collected in the "Golfe Normand-Breton" (GNB), a region of the English Channel. Compared to the actual distribution of P. rhomboides, the results suggest a strong influence of the growth-related processes on the distribution of the species: particularly, the extremely low growth obtained with the...
Tipo: Text Palavras-chave: Distribution; Meroplanktonic invertebrates; Ecophysiology; Growth model; English channel; Paphia rhomboides.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3115.pdf
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The Role of Pre-Existing Disturbances in the Effect of Marine Reserves on Coastal Ecosystems: A Modelling Approach ArchiMer
Savina, Marie; Condie, Scott A.; Fulton, Elizabeth A..
We have used an end-to-end ecosystem model to explore responses over 30 years to coastal no-take reserves covering up to 6% of the fifty thousand square kilometres of continental shelf and slope off the coast of New South Wales (Australia). The model is based on the Atlantis framework, which includes a deterministic, spatially resolved three-dimensional biophysical model that tracks nutrient flows through key biological groups, as well as extraction by a range of fisheries. The model results support previous empirical studies in finding clear benefits of reserves to top predators such as sharks and rays throughout the region, while also showing how many of their major prey groups (including commercial species) experienced significant declines. It was found...
Tipo: Text
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00175/28671/27115.pdf
Registros recuperados: 8
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