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Étude et modélisation des populations de macrophytes dans la lagune de Thau (Hérault, France) ArchiMer
Plus, Martin.
The works carried out can be divided in three main lines : design and management of experimental studies on primary production processes, macrophyte spatial distribution study and development of macrophyte and seagrass numerical models. In situ and in vitro experiments have been performed with the aim of studying the processes and the parameters involved in the photosynthesis-respiration system, as well as to establish the main biotic (self-shading effect, physiology of the photosynthesis, carbon, nitrogen and chlorophyll tissu contents) and abiotic (temperature, light and nutrients) factors controlling macrobenthic primary production. A seagrass ecosystem model based on nitrogen and oxygen fluxes has been developped. Model calibration and validation have...
Tipo: Text Palavras-chave: Primary production; Light; Nitrogen; Nutrients; Mathematical model; Thau lagoon; Seagrass; Macrophytes; Production primaire; Lumière; Azote; Nutriments; Model mathématique; Thau; Phanérogames; Macrophytes.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/these-6518.pdf
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Les Caridea (Crustacea: Decapoda) des Herbiers de Phanérogames Marines de Nouvelle-Caledonie (Région de Nouméa) (Systématiquee, écologie, variations Nycthémèrales et vicariance) Naturalis
Ledoyer, M..
This study deals with Caridean fauna living between the leaves of New-Caledonian seagrassmeadows (Cymodocea sp. principally) from zero to about eight meters and sampled during day and night. Twenty species (all figured) were caught (excluding Alpheidae). All are known. Nevertheless, in some cases, small variations have been observed by comparison with the same species from other areas. Presently, 70 species are recognized from New-Caledonian marine waters, including the 17 species reported in this papier for the first time from that region. Comparison with Caridean fauna of seagrass-meadows of other areas (Australia, Japan, Madagascar) shows a very important resemblance between them.
Tipo: Article / Letter to the editor Palavras-chave: Crustacea; Caridea; Taxonomy; Ecology; Phanérogames; Marines; Seagrass; Nou- velle-Calédonie; Circadian.; 42.74.
Ano: 1984 URL: http://www.repository.naturalis.nl/record/317743
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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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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: 4
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