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| Registros recuperados: 92 | |
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| Denis, L; Desroy, Nicolas; Ropert, Michel. |
| A laboratory flume study was conducted to determine the effect of flow velocity on clearance rates of the Polychaeta Terebellidea Lanice conchilega (Pallas, 1966). Using sets of 75 individuals collected along the east coast of the English Channel, we measured clearance rates at five flow velocities of approximate to 4, 9, 15, 22 and 27 cm s(-1) with a culture of the diatom Chaetoceros calcitrans as food source. During each control (without polychaetes) or clearance (with Lanice conchilega) experiment, in vivo fluorescence was continuously monitored. Further HPLC analysis confirmed the sediment resuspension for the highest flow velocities tested, indicating the need for 'corrections' from control experiments. The global pattern resulted in a dome-shaped... |
| Tipo: Text |
Palavras-chave: Recirculating flume; Feeding activity; Terebellidea; Polychaetes; Clearance rate; Lanice conchilega. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3418.pdf |
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| Alexandridis, Nikolaos; Dambacher, Jeffrey M.; Jean, Fred; Desroy, Nicolas; Bacher, Cedric. |
| In order to better understand and predict the dynamics of benthic macroinvertebrate communities, we need to first define the functional components of benthic biodiversity and then provide a mechanistic description of how they interact with their abiotic environment, their basic resources and each other. These interactions should be largely controlled by readily available biological traits, making trait-based modelling an ideal framework for the synthesis of relevant hypotheses from ecological theory and expert knowledge. With the help of benthic species traits, we derived a set of first principles regarding the role of organisms in processes of environmental filtering, consumption of algae/detritus, predation, use of space, biogenic habitat modification... |
| Tipo: Text |
Palavras-chave: Benthic macroinvertebrates; Biological traits; Biotic interactions; Community assembly; Functional groups; Qualitative modelling. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00394/50587/51411.pdf |
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| Rabaut, M.; Calderon, M. Audfroid; Van De Moortel, L.; Van Dalfsen, J.; Vincx, M.; Degraer, S.; Desroy, Nicolas. |
| Within coastal nurseries, the distribution of juvenile flatfish may depend on small-scale habitat variability. The presence of ecosystem engineers is known to have important impacts in coastal sediments. Lanice conchilega is a well-known marine ecosystem engineer of shallow soft bottom ecosystems, shaping the macrobenthic community and attracting flatfish. The present study examines the relation between juvenile flatfish and L conchilega reefs through two experiments. In a field experiment in the Dutch part of the North Sea, the benthic habitat is evaluated by comparing relative differences in numbers of juvenile flatfish between ecosystem engineered habitats and adjacent bare sand (i.e. non-ecosystem engineered) habitats. The hypothetical shelter seeking... |
| Tipo: Text |
Palavras-chave: Juvenile flatfish; Shelter; Feeding ground; Lanice conchilega; Ecosystem engineer; Pleuronectes platessa. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00170/28104/26702.pdf |
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| Arbach Leloup, F.; Desroy, Nicolas; Le Mao, Patrick; Pauly, D.; Le Pape, Olivier. |
| To ensure sustainable uses of the coastal zone, an integrated ecosystemic approach and ecosystem models are required to frame ecological processes and evaluate environmental impacts. Here, a mass-balance trophic (Ecopath) model of the Mont Saint Michel Bay (MSMB) was developed, to analyze the bay's functioning as an ecosystem. This bay, intensively exploited by fishing and for shellfish farming, is also suffering from the proliferation of the gastropod Crepidula fornicata, an exotic species. The MSMB model has 18 compartments, from the primary producers to top predators, and emphasizes the large biomass of filter feeders. The model identified the MSMB as a highly productive ecosystem controlled largely from the bottom-up, and strongly impacted by huge... |
| Tipo: Text |
Palavras-chave: Mont Saint Michel Bay; Crepidula fornicata; Invasive species; Shellfish farming; Trophic model; Ecopath. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2605.pdf |
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| Dauvin, J; Desroy, Nicolas; Denis, L; Ruellet, T. |
| The suprabenthos comprises all bottom-dependent animals, mainly crustaceans (including decapods and peracarids), which perform - with varying amplitude, intensity and regularity - seasonal or daily vertical migrations above the sea floor. The presence of organisms in the Benthic Boundary Layer is determined by two general factors: (1) organism behaviour, which depends on the light penetration in the water column and (2) boundary-layer hydrodynamics. In the coastal zone of the eastern English Channel, during the spring Phaeocystis bloom, the presence of gelatinous colonies modifies the penetration of light in the water column, which may seriously affect the abundance and/or the behaviour of the suprabenthos community. To clarify this point, 19 suprabenthic... |
| Tipo: Text |
Palavras-chave: Diel migration; Phaeocystis bloom; English channel; Suprabenthos. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4066.pdf |
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| Le Mao, Patrick; Godet, Laurent; Fournier, Jérôme; Desroy, Nicolas; Gentil, Franck; Thiébault, Eric; Pourinet, Laurent. |
| Le golfe Normano-Breton est bordé au sud par les côtes rocheuses bretonnes indentées des deux grandes baies de Saint-Brieuc et du Mont-Saint-Michel et, à l’est, par les côtes normandes, essentiellement sableuses et ponctuées d’une succession de havres entre les falaises de Carolles et le cap de la Hague. Abritant les îles Anglo-Normandes, ce golfe se caractérise par des petits fonds généralement inférieurs à 50 mètres de profondeur, un régime de marée macro à mégatidal, de forts courants et la présence de structures tourbillonnaires qui l’isolent en partie du reste de la Manche occidentale. La mosaïque de ses fonds – composés pour l’essentiel de sédiments grossiers – et de ses habitats benthiques, combinée à une riche histoire naturaliste, en font un... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00612/72375/71334.pdf |
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| Godet, Laurent; Fournier, Jerome; Jaffre, Mikael; Desroy, Nicolas. |
| In coastal areas, reef-builder worms often are bio-engineers by structuring their physical and biological environment. Many studies showed that this engineering role is determined by the densities of the engineer species itself, the highest densities approximately corresponding to the most stable areas from a sedimentological point of view, and hosting the richest and the most diverse benthic fauna. Here, we tested the potential influence of the spatio-temporal dynamics and the spatial fragmentation of one of the largest European intertidal reefs generated by the marine worm Lanice conchilega (Pallas, 1766) (Annelida, Polychaeta) on the associated benthic macrofauna. We demonstrated that the worm densities do have a significant positive role on the... |
| Tipo: Text |
Palavras-chave: Reefs; Zoobenthos; Stability; Fragmentation; Tidal flats; Bay of the Mont-Saint-Michel. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00044/15560/12973.pdf |
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| Kostecki, Caroline; Le Loc'H, F.; Roussel, J. -m.; Desroy, Nicolas; Huteau, D.; Riera, Pascal; Le Bris, H.; Le Pape, Olivier. |
| Estuaries are essential fish habitats because they provide nursery grounds for a number of marine species. Previous studies in the Bay of Vilaine (part of the Bay of Biscay, France) have underlined the estuarine dependence of juvenile common sole (Solea solea, L) and shown that the extent of sole nursery grounds was positively influenced by the variability of the river flow. In the present study, stable carbon and nitrogen isotopes were used to describe the trophic network until the young-of-the-year sole and to compare interannual variations in the dominant trophic pathways in the sole nursery areas in this bay. Particulate organic matter (POM), sediment organic matter (SOM), microphytobenthos, benthic invertebrate sole prey and young-of-the-year common... |
| Tipo: Text |
Palavras-chave: Juvenile Common Sole; Stable Isotopes; Estuarine Nursery Grounds; Food Web; Eastern Atlantic. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00008/11923/8641.pdf |
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| Le Mao, Patrick; Godet, Laurent; Fournier, Jérôme; Desroy, Nicolas; Gentil, Franck; Thiébault, Eric; Pourinet, Laurent. |
| Le golfe Normano-Breton est bordé au sud par les côtes rocheuses bretonnes indentées des deux grandes baies de Saint-Brieuc et du Mont-Saint-Michel et, à l’est, par les côtes normandes, essentiellement sableuses et ponctuées d’une succession de havres entre les falaises de Carolles et le cap de la Hague. Abritant les îles Anglo-Normandes, ce golfe se caractérise par des petits fonds généralement inférieurs à 50 mètres de profondeur, un régime de marée macro à mégatidal, de forts courants et la présence de structures tourbillonnaires qui l’isolent en partie du reste de la Manche occidentale. La mosaïque de ses fonds – composés pour l’essentiel de sédiments grossiers – et de ses habitats benthiques, combinée à une riche histoire naturaliste, en font un... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00611/72345/71240.pdf |
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| Sturbois, Anthony; Ponsero, Alain; Desroy, Nicolas; Le Mao, Patrick; Fournier, Jerome. |
| The feeding ecology of the red knot has been widely studied across its wintering range. Red knots mainly select bivalves and gastropods, with differences between sites due to variation in prey availability. Shorebird’s diet is also influenced or controlled by the tidal regime. The aim of this paper is to demonstrate the adaptation of foraging red knots to the megatidal environment. The variation in their diet during tidal cycles was studied in the bay of Saint-Brieuc, a functional unit for this species. The method used combined macrofauna, distribution of foraging birds and diet data. Comparative spatial analyses of macrofauna and distribution of foraging red knots have shown that the bay's four benthic assemblages are exploited by birds. By analysing... |
| Tipo: Text |
Palavras-chave: Diet; Benthos; Intertidal flat; Megatidal environment; Bay of Saint-Brieuc. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00226/33767/32194.pdf |
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| Kostecki, Caroline; Rochette, S.; Girardin, R.; Blanchard, Michel; Desroy, Nicolas; Le Pape, Olivier. |
| Coastal bays provide habitats for juveniles and adults of many marine species. Mont Saint-Michel Bay (MSMB, France) hosts a highly diversified fish community and constitutes one of the most important nursery grounds for many commercially exploited marine species, such as sea bass, flatfish, clupeids and rays in the English Channel. Besides, MSMB also suffers from the massive invasion of an exotic mollusc, the American slipper-limpet (Crepidula fornicata, L). This species arrived four decades ago and now represents the main filter-feeder biomass in the bay (150 Mt), an order of magnitude larger than local farmed and natural shellfishes. Recent analyses underlined the impact of this small gastropod on the trophic structure of this bay and its negative... |
| Tipo: Text |
Palavras-chave: Spatial competition; Flatfish habitat; Crepidula fornicata; Invasive species; Mont Saint-Michel Bay. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00035/14641/11990.pdf |
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| Registros recuperados: 92 | |
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