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|Title:||Distribution of phytoplankton along an environmental gradient off Kakinada, East Coast of India|
Pandiyarajan, R. S.
Ansari, Z. A.
|Keywords:||Kakinada;Phytoplankton;Distribution;Environmental gradient;Surface and subsurface water|
|Abstract:||In the present study phytoplankton distribution and species composition was examined on a salinity gradient from River (R), River Mouth (RM) and coastal water (RF) at surface and subsurface layers along the coast off Kakinada, East Coast of India. Average numerical abundance of phytoplankton at R, RM and RF are 336 nos.mL-1, 150 nos.mL-1 and 169 nos.mL-1 respectively. Percentage contribution of each group of phytoplankton was in the order: Pinnate diatoms > Cyanophyceans > Centrales > Prasinophyceans. However, total phytoplankton species at surface and subsurface water at all the stations showed presence of 52 and 24 species respectively. At the group level, cyanophyceans were significant at RF locations. Pennate diatoms were more at the remaining locations. Species Oscillatoria limosa was found to be abundant at both the surface and subsurface water with 340 filaments.ml-1 and 488 filaments.mL-1 recpectively. Thalassiothrix longissima was found to be maximum at surface water but absent in subsurface water. Wide variation in evenness values (0.16-0.910) suggests uneven distribution of species along the environmental gradient.|
|ISSN:||0975-1033 (Online); 0379-5136 (Print)|
|Appears in Collections:||IJMS Vol.43(03) [March 2014]|
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