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Registros recuperados: 6
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Fish fauna of a mixed meadow composed by the seagrasses Cymodocea nodosa and Zostera noltii in the Western Mediterranean ArchiMer
Guidetti, Paolo; Bussotti, Simona.
The fish fauna of a shallow meadow composed by the seagrasses Cymodocea nodosa and Zostera noltii was studied in the Gulf of Olbia (NE Sardinia, Italy; Western Mediterranean). Visual censuses were conducted monthly from August 1995 to August 1996. Environmental variables for water temperature, salinity and seagrass shoot density were collected on each sampling occasion. A total of 23 fish species from eight families were recorded. Planktivorous species (Atherinids) numerically dominated the fish community, followed by necto-benthic fish, chiefly Labrids and Sparids. There was no discernible trend in total fish density. Species richness, diversity, evenness and density of necto-benthic species, instead, displayed a distinct seasonal pattern, higher Values...
Tipo: Text Palavras-chave: Ichtyofaune; Phanérogames marines; Variations seasonnières; Mediterranée; Fish fauna; Seagrasses; Seasonal variations; Mediterranean.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43373/42838.pdf
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Relationship between land-use in the agro-forestry system of les Landes, nitrogen loading to and risk of macro-algal blooming in the Bassin d'Arcachon coastal lagoon (SW France) ArchiMer
De Wit, Rutger; Leibreich, J; Vernier, F; Delmas, F; Beuffe, H; Maison, P; Chossat, J; Laplace Treyture, C; Laplana, R; Clave, V; Torre, M; Auby, Isabelle; Trut, Gilles; Maurer, Daniele; Capdeville, P.
Nitrogen loading to the Bassin d'Arcachon coastal lagoon (SW France) was evaluated by studying land-use and nitrogen output in its 3001 km(2) catchment. At present, the catchment is dominated by forestry (79%), while intensive agriculture occupies 9% of the surface. The N-output of two hydrological subunits, i.e. the Tagon subunit dominated by pine forestry and the Arriou 11 subunit comprising both forestry and intensive agriculture, were monitored for a seven year period (1996-2002). From these observations it was calculated that forestry contributes on average 1.6 kg total N ha(-1) yr(-1), which is dominated by organic nitrogen (DON+PON are 70% of N). On an areal basis, intensive agriculture contributes 26 times more than forestry, i.e. 41.6 kg total N...
Tipo: Text Palavras-chave: Macroalgae; Seagrasses; Nitrogen loading; Catchment.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-757.pdf
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Responses of the molluscan fauna to environmental variations in a Halodule wrightii Ascherson ecosystem from Northeastern Brazil Anais da ABC (AABC)
BARROS,KCRISHNA V.S.; ROCHA-BARREIRA,CRISTINA A..
ABSTRACTThis study observed the spatial and temporal distributions of molluscs in a Halodule wrightii meadow, verifying if they respond satisfactorily to seasonal changes in this seagrass ecosystem. Twenty-four species were identified. Chitons were rare, bivalves had greater number of species (11), followed by gastropods (9) which were also the most abundant class (73%). All classes were more abundant in the belowground. The most common species was Tricolia affinis, especially in aboveground. The occurrence of some species in both strata or out of the expected stratum may have been influenced by shallow layer of the sediment considered in this study, hydrodynamic, and low biomass of the studied meadow. According to univariate and multivariate analyses,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic communities; Hypnea musciformis; Marine food web; Northeast of Brazil; Seagrasses; Tricolia affinis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401397
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Rôle des herbiers de Zostères (Zostera noltii) sur la dynamique sédimentaire du Bassin d'Arcachon ArchiMer
Ganthy, Florian.
The intertidal flats in the Arcachon lagoon are extensively colonized by seagrass meadows of Zostera noltii. The last ten years these meadows experienced a drastic regression of their surface area. Understanding the impact of seagrass on hydrodynamics and sediment dynamics is required to anticipate the consequences of meadows regression on the sediment dynamics of the Arcachon lagoon. Flume experiments with natural seagrass highlighted a strong velocity attenuation associated with a turbulence increase near the bed within seagrass canopies. An increase in sediment protection from erosion and in deposition fluxes related to the seagrass growth was found. Erosion tests showed seasonal variability of sediment resistance against erosion associated with changes...
Tipo: Text Palavras-chave: Phanérogames; Zostera noltii; Croissance saisonnière; Dynamique sédimentaire; Bassin d’Arcachon; Seagrasses; Zostera noltii; Seasonal growth; Sediment dynamics; Arcachon lagoon.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00060/17170/14672.pdf
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Seasonal variations in photosynthetic irradiance response curves of macrophytes from a Mediterranean coastal lagoon ArchiMer
Plus, Martin; Auby, Isabelle; Verlaque, Marc; Levavasseur, Guy.
The main photosynthesis and respiration parameters (dark respiration rate, light saturated production rate, saturation irradiance, photosynthetic efficiency) were measured on a total of 23 macrophytes of the Than lagoon (2 Phanerogams, 5 Chlorophyceae, 10 Rhodophyceae and 6 Phaeophyceae). Those measurements were performed in vitro under controlled conditions, close to the natural ones, and at several seasons. Concomitantly, measurements of pigment concentrations, carbon, phosphorous and nitrogen contents in tissues were performed. Seasonal intra-specific variability of photosynthetic parameters was found very high, enlightening an important acclimatation capacity. The highest photosynthetic capacities were found for Chlorophyceae (e.g. Monostroma obscurum...
Tipo: Text Palavras-chave: Thau lagoon; Phaeophyceae; Rhodophyceae; Chlorophyceae; Seagrasses; Seasonal variations; Oxygen method; Macrophytes; Light response curve; Photosynthesis.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-465.pdf
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Temporal and spatial changes of seagrass meadows in a Mediterranean coastal lagoon ArchiMer
Agostini, S; Marchand, B; Pergent, G.
Aerial photographs and in situ data of the Urbinu Lagoon (one of the largest and deepest ponds in Corsica, Mediterranean Sea) permit the establishment of a cartography of its aquatic benthic assemblages and types of sea-beds. It was possible to distinguish in the photographs submerged structures such as: sand, pebbles, mud and seagrass meadows. Seagrass beds were the predominant vegetation type in this lagoon (comprising 14-29% of the total area depending on the year studied), and their distribution was incorporated into a geographical information database, and then compared with historical data. Temporal and spatial change in seagrass meadows was assessed between 1990 and 1997. Change in total extent was evaluated through a map to map comparison of data...
Tipo: Text Palavras-chave: Phanérogames; Lagune méditerranéenne; Traitement d’image; Évolution d’écosystème; Seagrasses; Mediterranean lagoon; Image processing; Change detection.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00322/43296/43032.pdf
Registros recuperados: 6
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