nstantaneous and historical temperature effects on a-pinene
on phytoplankton characteristics in Ayyampattinam
Centre of Advanced Study in
Marine Biology, Faculty of Marine Sciences, Annamalai
University, Parangipettai - 608502, India.
Department of Biotechnology, Periyar
University, Salem – 636 011, India.
21 September 2011
Physico-chemical variables in the marine
environment are subjected to wide spatiotemporal variations. The various physico-chemical parameters viz:
temperature, salinity, pH, dissolved oxygen and nutrients of the environment
are the factors which mainly influence the production and successful
propagation of planktonic life in the coastal
biotopes. The ranges of values of surface water temperature (0°C), salinity
(‰), pH and dissolved oxygen (ml l-1) were: 25.5 - 33.4; 23 - 35; 7.8 - 8.2; 3.6 - 5.2, respectively.
The values (µg l-1) of nutrients were: nitrate 3.21
- 6.34, nitrite 0.74 - 0.896, phosphate 0.22 and 1.16, silicate 24.85 - 61.92
and ammonia 0.05 - 0.32. The recorded values of primary productivity (mgcm-3hr-1) ranged between
16 – 116 and the chlorophyll “a” varied from 3.74 – 8.52. A
total number of 51 species of phytoplankton representing different classes viz: Bacillariophyceae (40); Dinophyceae (8); Chlorophyceae
(1) and Cyanophyceae(2) was
recorded. Among the four classes, Bacillariophyceae
appeared to be the dominant group in respect of total species and cell
numbers. The population density of phytoplankton was high during summer
season and quite low during monsoon season.
parameters, Inorganic nutrients, Phytoplankton, Species diversity