Gopalakrishna Pillai,N; Dr.Damodaran,R(Cochin University of Science And Technology, December , 1978)
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Abstract:
In this thesis a detailed sampling is conducted using grabs and dredges to access the qualitative
and quantitative nature of the macrobenthos. A11 the animal contributing to the fauna are identified and their pattern of distribution and seasonal abundance are discussed. Affinity and diversity of polychaete fauna have also been studied. Importance of different benthic forms and their contribution to the standing crop are studied in detail. Trophic relationship between macrofauna and botton feeding commercially important fishes and prawns are also
given attention. The physico-chemical aspects or the environment have been studied and their relation to the distribution and abundance of bottom fauna has been discussed. Environmental
parameters such as temperature. salinity and dissolved oxygen. both in bottom and in the overlying waters. and rainfall were studied along with the benthos investigations. The physico-chemical nature of the sediments was also subjected to investigation. Influence of
all those ecological parameters on the bottom fauna is discussed. A detailed quantitative faunal list of maorobenthio species and a brief systematic account of the polychaeta are also given.
Description:
School of marine sciences, Cochin University of Science And Technology
Haridevi, C K; Dr.Revichandran,C(Cochin University Of Science And Technology, May , 2013)
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Abstract:
The influence of salinity on phytoplankton varies widely, because
different species have different salinity preferences. Like marine and
aquatic species, many phytoplankton species exhibit tolerance to certain
salinity, beyond which, it can inhibit their growth. Light is the most
important factor that influences phytoplankton growth. In aquatic
environments (lakes, sea or estuary) the light incident on the surface is rapidly reduced exponentially with depth (Krik, 1994). In estuaries, the
major factor influencing the light availability is the suspended particulate
matter, which attenuates and scatters the light. The light changes with time
of the day and the season, affecting the amount of light penetrating the
water column. Similarly, biological factor like copepod grazing is a major
factor influencing the standing crop of phytoplankton. The copepod can
actively graze up to 75% of the phytoplankton biomass in a tropical
estuary (Tan et. al., 2004). It is in the context that the present study
investigates the salinity, light (physical factors) and copepod grazing
(biological factor) phytoplankton as the factors controlling phytoplankton
growth and distribution
Description:
National Institute of
Oceanography, Regional Centre, Kochi