Seasonal changes in bacterial and phytoplankton biomass in a subantarctic coastal area (Kerguelen Islands)

Hydrobiologia ◽  
1996 ◽  
Vol 330 (2) ◽  
pp. 143-150 ◽  
Author(s):  
D. Delille ◽  
M. Fiala ◽  
S. Razouls
Keyword(s):  
Coastal Area ◽  
Seasonal Changes ◽  
Phytoplankton Biomass ◽  
Kerguelen Islands

The instantaneous transport of inorganic and organic material in a highly polluted tropical estuary

2013 ◽  
Vol 64 (6) ◽  
pp. 562 ◽  
Author(s):  
Carlos E. D. Noriega ◽  
Marilene Felipe Santiago ◽  
Patrícia Façanha ◽  
Maria da Glória Gonçalves da Silva Cunha ◽  
Rodolfo Araújo da Silva ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Coastal Area ◽  
Rainy Season ◽  
Phytoplankton Biomass ◽  
Dry Season ◽  
Tropical Estuary ◽  
Liquid Transport ◽  
Water Renewal ◽  
Rainy Period ◽  
Dissolved Inorganic Nutrients

The contribution of the estuarine channel of Recife harbour to the eutrophication of the Recife coastal area was evaluated by quantifying the instantaneous transport of salt, dissolved inorganic nutrients (PO4–, SiOH4, NO3–, NO2– and, NH4+), material in suspension, Chlorophyll-a, pico–nanoplankton and microplankton during the rainy (June 2007) and dry (November 2007) seasons. The results showed that all of the dissolved nitrogenated nutrients, the silicate and the material in suspension had higher concentrations during the rainy season, whereas the phosphate and Chlorophyll-a (both the total and the pico–nanoplankton and microplankton fractions) showed greater concentrations during the dry season. All of the materials considered were exported to the sea except for Chlorophyll-a (pico–nanoplankton and microplankton fractions) during the dry season, when these materials were imported into the area. The total liquid transport in the rainy season was three times higher than that found for the dry season. Silicate represented nearly 85% of the total exported material during the rainy period, whereas during the dry season, phosphate and silicate represented 79% of the total exported material. The stratification and circulation processes indicated a well mixed environment. The water-renewal rate was low, as demonstrated by the input of phytoplankton biomass during November. The area was characterised as eutrophic during the months investigated.

Changes in chemical parameters in the Bulgarian Black Sea coastal area as an indication of the ecological state of the environment

1999 ◽  
Vol 39 (8) ◽  
pp. 37-45 ◽  
Author(s):  
G. Shtereva ◽  
S. Moncheva ◽  
V. Doncheva ◽  
O. Christova ◽  
I. Shterev
Keyword(s):  
Black Sea ◽  
Coastal Area ◽  
Phytoplankton Biomass ◽  
Positive Sign ◽  
The Black Sea ◽  
Ecological State ◽  
Chemical Parameters ◽  
Phytoplankton Communities ◽  
High Level ◽  
State Of The Environment

In the present paper the main trends in the principal chemical parameters and the phytoplankton communities in the close coastal area are discussed, aimed at evaluating the present ecological state of the environment and water quality in comparison with historical data. The results reveal a decrease in the content of PO4 and Si, while there is no apparent trend in the N-NO3 variability. In seasonal terms a change in the minima and maxima of some parameters is evident, and a seasonal dynamic closer to the natural annual cycle in the Black Sea. A decrease in the average annual phytoplankton biomass is established, especially pronounced during the summer period. The results suggest a positive sign of evolution of the environmental characteristics of the coastal zone, which should be treated rather tentatively due to the still high level of nutrients and the capacity of the ecosystem to produce and maintain high phytoplankton biomass.

Seasonal changes of CO2, CH4 and N2O fluxes in relation to land-use change in tropical peatlands located in coastal area of South Kalimantan

Chemosphere ◽  
2003 ◽  
Vol 52 (3) ◽  
pp. 603-608 ◽  
Author(s):  
K. Inubushi ◽  
Y. Furukawa ◽  
A. Hadi ◽  
E. Purnomo ◽  
H. Tsuruta
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Coastal Area ◽  
Seasonal Changes ◽  
Tropical Peatlands ◽  
N2o Fluxes ◽  
Ch4 And N2o
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