Annual Variations in CO2 Assimilation and Primary Production Measurements in a Mediterranean Lagoon (Thau Lagoon, France)

1995 ◽  
pp. 4765-4768
Author(s):  
Fouilland Eric ◽  
Vaquer André ◽  
Descolas-Gros Chantal
Keyword(s):  
Primary Production ◽  
Co2 Assimilation ◽  
Mediterranean Lagoon ◽  
Annual Variations ◽  
Thau Lagoon

Influence of the Drainage Basin input on a Pathogenic Bacteria (Salmonella) Contamination of a Mediterranean Lagoon (The Thau Lagoon - France) and the Survival of This Bacteria in Brackish Water

1992 ◽  
Vol 25 (12) ◽  
pp. 105-114 ◽  
Author(s):  
P. Galès ◽  
B. Baleux
Keyword(s):  
Pathogenic Bacteria ◽  
Drainage Basin ◽  
Sewage Treatment ◽  
Water Levels ◽  
Sewer System ◽  
Sewage Treatment Plants ◽  
Mediterranean Lagoon ◽  
Episodic Events ◽  
Potential Sources ◽  
Thau Lagoon

Research has been carried out over a 10 month period with the aim of identifying potential sources of Salmonella contamination in a Mediterranean lagoon (the Thau Lagoon). Two types of source have been sampled, permanent ones which are checked monthly, and incidental ones. The highest occurrence of Salmonella is linked to episodic events brought on by rainfall. After summer low water levels, the rising of river water brings back into circulation water from pools previously formed by waste water from sewage treatment plants and sediments, thus creating a significant source of bacteria. The sewer system can also supply the Thau Lagoon with varying quantities of Salmonella when the system breaks down, and also when it is overloaded by an excess of rainwater following a storm. Monthly checks reveal that discharges of Salmonella occurred occasionally in permanent inputs, whereas the outflow from the Mèze pond provides a quasi-permanent, but negligible, source of contamination. The major risk of shellfish breeding contamination is thus associated with rainfall, and the occasional overflow of raw wastewater.The survival of Salmonella in the lagoon waters varies in function with the seasons, and the risk is greatest at those times of the year when autopurification can be affected.

Primary Production in a Tidally Energetic Fjord: Evidence of Seasonal and Inter-annual Tidal Forcing

1989 ◽  
Vol 46 (12) ◽  
pp. 2166-2172 ◽  
Author(s):  
T. A. Kessler ◽  
T. R. Parsons
Keyword(s):  
Primary Production ◽  
Standing Stock ◽  
Covariance Structure ◽  
Static Stability ◽  
Data Set ◽  
Annual Variations ◽  
Basin Surface ◽  
Statistical Relationships ◽  
Inflow Jet

A long term data set collected from a tidally energetic sill fjord was analyzed for its statistical relationships between primary production indices and several represented environmental variables. The analysis identified variance and covariance structure in these variables implicating changes in water column clarity, in inter-annual variability of phytoplankton carbon uptake rate, and the static stability of basin surface water in phytoplankton standing stock. The biomass–stability relationship was found to be seasonally dependent, with biomass positively correlated with stability in the summer and negatively correlated in the spring/fall, and restricted to waters under the direct mixing influence of the tidal inflow jet. These statistical patterns are discussed in terms of a possible control of primary production by seasonal and inter-annual variations in tidal inflow buoyancy.

scholarly journals Biotic interactions, energy pathways and trigger factors of ecosystem dynamics in shallow saline lakes

2014 ◽  
Vol 12 (4) ◽  
pp. 83-113
Author(s):  
Sergei M. Golubkov ◽  
Mikhail S. Golubkov ◽  
Evgenia V. Balushkina ◽  
Larisa F. Litvinchuk
Keyword(s):  
Primary Production ◽  
Great Influence ◽  
Biotic Interactions ◽  
Weather Conditions ◽  
Ecosystem Dynamics ◽  
High Concentration ◽  
Annual Variations ◽  
The Crimea ◽  
High Level ◽  
Energy Pathways

Environmental variables, food-web dynamics, and energy pathways were investigated in ecosystems of six shallow lakes of the Crimea with salinity ranging from 24 to 340‰. There were considerable inter- and intra-annual #uctuations in the abiotic characteristics of the lakes. All the lakes had a very high concentration of total phosphorus in the water (up to 5.6 gP m-3) due to a great influence of the watershed on the lakes. A high level of primary production (up to 14.9 gC m-2 d-1) was found in the most of the lakes. The lowest primary production was found in the most saline lake with a dense population of the filtrator, Artemia urmiana. Grazing benthic energy pathways were dominant at salinities between 24 and 58‰. Greater levels of salinity led to a gradual reduction of benthic and increase of planktonic energy pathways. A fast shift from turbid to the clear-water regime was observed in one of the lakes, caused by annual variations in weather conditions.

scholarly journals Modelling nitrogen, primary production and oxygen in a Mediterranean lagoon. Impact of oysters farming and inputs from the watershed

2000 ◽  
Vol 127 (2-3) ◽  
pp. 161-181 ◽  
Author(s):  
Annie Chapelle ◽  
Alain Ménesguen ◽  
Jean-Marc Deslous-Paoli ◽  
Philippe Souchu ◽  
Nabila Mazouni ◽  
...  
Keyword(s):  
Primary Production ◽  
Mediterranean Lagoon

scholarly journals Variabilidad de la eficiencia en el uso del carbono a partir de datos MODIS

2017 ◽  
pp. 1
Author(s):  
M. Cañizares ◽  
A. Moreno ◽  
S. Sánchez-Ruiz ◽  
M.A. Gilabert
Keyword(s):  
Primary Production ◽  
Net Primary Production ◽  
Vegetation Type ◽  
Gross Primary Production ◽  
Annual Average ◽  
Annual Variations ◽  
Carbon Use Efficiency ◽  
Temperature And Precipitation ◽  
Use Efficiency ◽  
Peninsular Spain

<p>Carbon use efficiency (CUE) describes how efficiently plants incorporate the carbon fixed during photosynthesis into biomass gain and can be calculated as the ratio between net primary production (NPP) and gross primary production (GPP). In this work, annual CUE has been obtained from annual GPP and NPP MODIS products for the peninsular Spain study area throughout eight years. CUE is spatially and temporally analyzed in terms of the vegetation type and annual precipitation and annual average air temperature. Results show that dense vegetation areas with moderate to high levels of precipitation present lower CUE values, whereas more arid areas present the highest CUE values. However, the temperature effect on the spatial variation of CUE is not well characterized. On the other hand, inter-annual variations of CUE of different ecosystems are discussed in terms of inter-annual variations of temperature and precipitation. It is shown that CUE exhibited a positive correlation with precipitation and a negative correlation with temperature in most ecosystems. Thus, CUE decreases when the ecosystem conditions change towards aridity.</p>

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