Record Details

Population dynamics of estuarine amphipods in Cochin backwaters

DRS at CSIR-National Institute of Oceanography

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Title Population dynamics of estuarine amphipods in Cochin backwaters
 
Creator Nair, K.K.C.
Gopalakrishnan, T.C.
Venugopal, P.
Peter, G.
Jayalakshmy, K.V.
Rao, T.S.S.
 
Subject Population Studies
correlation
carbon/nitrogen ratio
dissolved oxygen
temperature
species diversity
salinity
check lists
backwaters
estuaries
population dynamics
zooplankton
Amphipods
ISW, India, Kerala, Cochin
 
Description Population dynamics of 11 gammarid amphipod species (belonging to 9 genera), collected from Cochin backwaters, have been studied for the first time, based on an year round collection. The species are : Corophium triaenonyx Stebbing, Photis digitata Barnard, Grandidierella gilesi Chilton, Melita zeylanica Stebbing, Eriopisa chikensis (Chilton), Quadrivisio bengalensis Stebbing, Grandidierella bonnieri Stebbing, Cheiriphotis megacheles Walker, Ampelisca zamboangae Stebbing, Perioculodes longimanus (Bate and Westwood) and Ampelisca cyclops Walker. The highly varying salinities (0 to 36.20 ppt S) are one of the major limiting factors which govern the numerical density and species diversity of these gammarid populations. Except for the 3 high saline species A. Zamboangae, A. cyclops and P. longimanus, which are recorded during late January, all other species contribute substantially to the ecosystem. C. megacheles and G. bonnieri are estuarine and failed to establish themselves. C. triaenonyx is the most widespread species inhabiting all stations with maximum numerical abundance. The coefficient of correlation of different groups with temperature, salinity, dissolved oxygen, C/N ratio and phosphorus revealed that representatives of the families Ampeliscidae, Gammaridae and Photidae are negatively correlated with salinity. Members of the family Corophidae showed some positive correlation with salinity. None of the groups exhibited significant correlation with temperature or with dissolved oxygen. The effect of temperature, salinity and dissolved oxygen on the production of gammarid amphipods was studied by multiple regression analysis. Salinity was found to be the prominent factor controlling the abundance of gammarid amphipods, followed by temperature and dissolved oxygen. The fitted regression was found to be significant at the 1% level (P0.01) only for Station 1
 
Date 1995-06-14T10:00:59Z
2017-09-29T13:48:37Z
1995-06-14T10:00:59Z
2017-09-29T13:48:37Z
1983
 
Type Journal Article
 
Identifier Marine Ecology Progress Series, vol.10; 1983; 289-295
0171-8630
http://drs.nio.org/drs/handle/2264/6551
 
Language en
 
Relation Mar Ecol-Prog Ser
SCI
 
Publisher Inter-Research