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Hyperspectral and Lidar: Complementary Tools to Identify Benthic Features and Assess the Ecological Status of Sabellaria alveolata Reefs ArchiMer
Bajjouk, Touria; Jauzein, Cecile; Drumetz, Lucas; Dalla Mura, Mauro; Duval, Audrey; Dubois, Stanislas.
Sabellaria alveolata is a sedentary gregarious tube-building species widely distributed from southwest Scotland to Morocco. This species builds what are currently considered the largest European biogenic reefs in the bay of Mont-Saint-Michel (France). As an ecosystem engineer, S. alveolata generates small to large scale topographic complexity, creating numerous spatial and trophic niches for other species to colonize. Sabellaria reefs are also under anthropogenic pressures, leading locally to massive degradation. However, stakeholders lack spatially explicit measures of reef ecological status, at adapted spatial resolution to provide key management information for this protected habitat. Traditional field surveys are extremely time-consuming and rely on...
Tipo: Text Palavras-chave: Benthic habitats; Biogenic reefs; Ecological status; Hyperspectral; Intertidal; Lidar; Mapping.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00654/76574/77710.pdf
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A review of potential impacts of submarine power cables on the marine environment: Knowledge gaps, recommendations and future directions ArchiMer
Taormina, Bastien; Bald, Juan; Want, Andrew; Thouzeau, Gerard; Lejart, Morgane; Desroy, Nicolas; Carlier, Antoine.
Submarine power cables (SPC) have been in use since the mid-19th century, but environmental concerns about them are much more recent. With the development of marine renewable energy technologies, it is vital to understand their potential impacts. The commissioning of SPC may temporarily or permanently impact the marine environment through habitat damage or loss, noise, chemical pollution, heat and electromagnetic field emissions, risk of entanglement, introduction of artificial substrates, and the creation of reserve effects. While growing numbers of scientific publications focus on impacts of the marine energy harnessing devices, data on impacts of associated power connections such as SPC are scarce and knowledge gaps persist. The present study (1)...
Tipo: Text Palavras-chave: Submarine power cables; Marine renewable energy; Environmental impacts; Ecosystem functioning; Benthic habitats.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00454/56542/58330.pdf
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Environmental factors affecting maerl bed structure in Brittany (France) ArchiMer
Dutertre, Mickael; Grall, Jacques; Ehrhold, Axel; Hamon, Dominique.
This study used a large spatial scale approach in order to better quantify the relationships between maerl bed structure and a selection of potentially forcing physical factors. Data on maerl bed structure and morpho-sedimentary characteristics were obtained from recent oceanographic surveys using underwater video recording and grab sampling. Considering the difficulties in carrying out real-time monitoring of highly variable hydrodynamic and physicochemical factors, these were generated by three-dimensional numerical models with high spatial and temporal resolution. The BIOENV procedure indicated that variation in the percentage cover of thalli can best be explained (correlation = 0.76) by a combination of annual mean salinity, annual mean nitrate...
Tipo: Text Palavras-chave: Benthic habitats; Brittany; Environmental factors; Estuary; Large spatial scale; Maerl.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00280/39089/37816.pdf
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A Methodology and Tool for Mapping the Risk of Cumulative Effects on Benthic Habitats ArchiMer
Quemmerais-amice, Frédéric; Barrere, Julien; La Rivière, Marie; Contin, Gabriel; Bailly, Denis.
The implementation of the European integrated marine policy poses many scientific challenges. Among them, the knowledge and understanding of interactions between anthropogenic pressures and ecological components is an important issue, particularly to help define Good Environmental Status, environmental targets and monitoring programs of the Marine Strategy Framework Directive (2008, MSFD). Assessment of cumulative effects of different pressures is a particularly complex issue requiring modeling tools and methods, as well as accurate data sets on human activities, anthropogenic pressures and ecological components. The results of these assessments are also uncertain and highly dependent on the calculation methods and assumptions, as well as on the data sets...
Tipo: Text Palavras-chave: Cumulative effects assessment; Human activities; Anthropogenic pressures; Benthic habitats; Risk; Marine Strategy Framework Directive.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00658/77028/78310.pdf
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Nursery function of coastal temperate benthic habitats: New insight from the bivalve recruitment perspective ArchiMer
Barbier, Pierrick; Meziane, Tarik; Foret, Martin; Tremblay, Rejean; Robert, Rene; Olivier, Frederic.
Marine habitat function has been typically investigated in terms of biogeochemical regulation but rarely in terms of population renewal, which is mainly controlled by recruitment dynamics. The recruitment phase is crucial for organisms with a bentho-pelagic life cycle, such as bivalves, and it regulates the population renewal success. This study provides new insight on the role of temperate benthic habitats on bivalve recruitment, as a function of nursery areas. Six dominant benthic habitats of the Chausey archipelago (Normandy, France) were studied. In each habitat, bivalve recruit assemblages were described at the end of two reproductive seasons. Furthermore, Ostrea edulis juveniles were immerged on each habitat during two months to compare growth...
Tipo: Text Palavras-chave: Benthic habitats; Bivalve recruitment; Nursery function; Ostrea edulis; Fatty acids.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00367/47863/47845.pdf
Registros recuperados: 5
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