Dietary preference and feeding ecology of Nematalosa nasus (Bloch 1795) in Chilika lagoon, India,... more Dietary preference and feeding ecology of Nematalosa nasus (Bloch 1795) in Chilika lagoon, India, was investigated through analysis of prey items in the guts and that in the habitat. Of the 230 taxa identified from the habitat in plankton samples from the lagoon, thirty five taxa were recorded from the guts of the fish. Index of Relative Importance showed 80% of the food comprised of microplankton groups viz. Foraminifera (35.79%), Chlorophyceae (20.52%), Bacillariophyaceae (12.30%), Cyanophyaceae (6.53%), other plant matter (3.65%) and Euglenophyaceae (0.76%). The fish is a generalized feeder on microplankton, with specialization on foraminiferans and Chlorophyaceae in Chilika Lagoon. Diet composition varied significantly with seasons. Prey type selectivity showed, preference to Gyrosigma sp. (αi—0.98, ei—0.85), Synedra sp. (αi—0.47, ei—0.71), Tabellaria sp. (αi—0.58, ei—0.47) and Ulothrix sp. (αi—0.06, ei—0.34) during monsoon and post-monsoonseason. Ammoniabeccarii (αi—0.77 ei—0.98), Campylodiscus sp. (αi—0.04, ei—0.17) and Microspora sp. (αi—0.18, ei—0.76), were selected during pre-monsoon period, which is also the peak breeding period of the fish.
The immaculate puffer fish, Arothron immaculatus was recorded for the first time from Chilika wit... more The immaculate puffer fish, Arothron immaculatus was recorded for the first time from Chilika with a single specimen (TL: 107.9 mm) collected from the outer channel sector, adding a new record to the ichthyofaunal diversity of finfish species from the lagoon.
The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyce... more The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyceae in Chilika lagoon, north east coast of India. Thirty-eight species of dinoflagellates belonging to eight families were recorded, of which twelve are new reports to the lagoon. Of the twenty-six species recorded earlier, Neoceratium furca, Neoceratium fusus, Dinophysis caudata and Noctiluca scintillans were common among most of the earlier studies. Current study recorded presence of Dinophysis miles, which has not been encountered ever since it was first reported from the lagoon six decades ago. An updated checklist of dinoflagellates indicated presence of 68 species in the lagoon. The outer channel of the lagoon differed from southern and central sectors in distribution of dinoflagellates under the influence of salinity regime.
Four species of carangids, Caranx papuensis , Carangoides ferdau , Trachinotus botla and Trachino... more Four species of carangids, Caranx papuensis , Carangoides ferdau , Trachinotus botla and Trachinotus baillonii are presented here as new records from Chilika Lagoon, India. Five specimen of C. ferdau obtained are of juveniles, and hence represent possibility of breeding or spawning ground in the lagoon. The other carangid species collected were during late monsoon period from outer channel in brackish water conditions (13.07 ppt). Of the 60 known species of carangids in Indian waters, Chilika now support 23 (38%) species.
Environmental monitoring and assessment, Jan 30, 2018
Microplankton population of Asia's largest coastal lagoon Chilika was studied for five major ... more Microplankton population of Asia's largest coastal lagoon Chilika was studied for five major groups, bacillariophyceae, cyanophyceae, chlorophyceae, dinophyceae, rotifera, and tintinninae. The study reported presence of 233 species of microplankton whose average annual abundance was 1631 cells/l. The physicochemical parameters contributing to the spatio-temporal fluctuations in microplankton diversity, abundance, and community structure were identified as salinity, pH, DO, nitrate, and silicate. Salinity, transparency, depth, and silicate most explained the abundance of bacillariophyceae; nitrate, pH, and DO influenced cyanophyceae; salinity, transparency, and chlorophyll concentration influenced chlorophyceae; salinity, depth, and water temperature influenced dinophyceae; salinity, free CO2, and nitrate-influenced rotifers, whereas salinity, pH, DO, and depth influenced tintinnids. Biotic-abiotic relationships revealed particular preference of environmental conditions at specie...
The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyce... more The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyceae in Chilika lagoon, north east coast of India. Thirty-eight species of dinoflagellates belonging to eight families were recorded, of which twelve are new reports to the lagoon. Of the twenty-six species recorded earlier, Neoceratium furca, Neoceratium fusus, Dinophysis caudata and Noctiluca scintillans were common among most of the earlier studies. Current study recorded presence of Dinophysis miles, which has not been encountered ever since it was first reported from the lagoon six decades ago. An updated checklist of dinoflagellates indicated presence of 68 species in the lagoon. The outer channel of the lagoon differed from southern and central sectors in distribution of dinoflagellates under the influence of salinity regime.
Dietary preference and feeding ecology of Nematalosa nasus (Bloch 1795) in Chilika lagoon, India,... more Dietary preference and feeding ecology of Nematalosa nasus (Bloch 1795) in Chilika lagoon, India, was investigated through analysis of prey items in the guts and that in the habitat. Of the 230 taxa identified from the habitat in plankton samples from the lagoon, thirty five taxa were recorded from the guts of the fish. Index of Relative Importance showed 80% of the food comprised of microplankton groups viz. Foraminifera (35.79%), Chlorophyceae (20.52%), Bacillariophyaceae (12.30%), Cyanophyaceae (6.53%), other plant matter (3.65%) and Euglenophyaceae (0.76%). The fish is a generalized feeder on microplankton, with specialization on foraminiferans and Chlorophyaceae in Chilika Lagoon. Diet composition varied significantly with seasons. Prey type selectivity showed, preference to Gyrosigma sp. (αi—0.98, ei—0.85), Synedra sp. (αi—0.47, ei—0.71), Tabellaria sp. (αi—0.58, ei—0.47) and Ulothrix sp. (αi—0.06, ei—0.34) during monsoon and post-monsoonseason. Ammoniabeccarii (αi—0.77 ei—0.98), Campylodiscus sp. (αi—0.04, ei—0.17) and Microspora sp. (αi—0.18, ei—0.76), were selected during pre-monsoon period, which is also the peak breeding period of the fish.
The immaculate puffer fish, Arothron immaculatus was recorded for the first time from Chilika wit... more The immaculate puffer fish, Arothron immaculatus was recorded for the first time from Chilika with a single specimen (TL: 107.9 mm) collected from the outer channel sector, adding a new record to the ichthyofaunal diversity of finfish species from the lagoon.
The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyce... more The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyceae in Chilika lagoon, north east coast of India. Thirty-eight species of dinoflagellates belonging to eight families were recorded, of which twelve are new reports to the lagoon. Of the twenty-six species recorded earlier, Neoceratium furca, Neoceratium fusus, Dinophysis caudata and Noctiluca scintillans were common among most of the earlier studies. Current study recorded presence of Dinophysis miles, which has not been encountered ever since it was first reported from the lagoon six decades ago. An updated checklist of dinoflagellates indicated presence of 68 species in the lagoon. The outer channel of the lagoon differed from southern and central sectors in distribution of dinoflagellates under the influence of salinity regime.
Four species of carangids, Caranx papuensis , Carangoides ferdau , Trachinotus botla and Trachino... more Four species of carangids, Caranx papuensis , Carangoides ferdau , Trachinotus botla and Trachinotus baillonii are presented here as new records from Chilika Lagoon, India. Five specimen of C. ferdau obtained are of juveniles, and hence represent possibility of breeding or spawning ground in the lagoon. The other carangid species collected were during late monsoon period from outer channel in brackish water conditions (13.07 ppt). Of the 60 known species of carangids in Indian waters, Chilika now support 23 (38%) species.
Environmental monitoring and assessment, Jan 30, 2018
Microplankton population of Asia's largest coastal lagoon Chilika was studied for five major ... more Microplankton population of Asia's largest coastal lagoon Chilika was studied for five major groups, bacillariophyceae, cyanophyceae, chlorophyceae, dinophyceae, rotifera, and tintinninae. The study reported presence of 233 species of microplankton whose average annual abundance was 1631 cells/l. The physicochemical parameters contributing to the spatio-temporal fluctuations in microplankton diversity, abundance, and community structure were identified as salinity, pH, DO, nitrate, and silicate. Salinity, transparency, depth, and silicate most explained the abundance of bacillariophyceae; nitrate, pH, and DO influenced cyanophyceae; salinity, transparency, and chlorophyll concentration influenced chlorophyceae; salinity, depth, and water temperature influenced dinophyceae; salinity, free CO2, and nitrate-influenced rotifers, whereas salinity, pH, DO, and depth influenced tintinnids. Biotic-abiotic relationships revealed particular preference of environmental conditions at specie...
The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyce... more The study deals with the diversity and spatial distribution of the dinoflagellate class Dinophyceae in Chilika lagoon, north east coast of India. Thirty-eight species of dinoflagellates belonging to eight families were recorded, of which twelve are new reports to the lagoon. Of the twenty-six species recorded earlier, Neoceratium furca, Neoceratium fusus, Dinophysis caudata and Noctiluca scintillans were common among most of the earlier studies. Current study recorded presence of Dinophysis miles, which has not been encountered ever since it was first reported from the lagoon six decades ago. An updated checklist of dinoflagellates indicated presence of 68 species in the lagoon. The outer channel of the lagoon differed from southern and central sectors in distribution of dinoflagellates under the influence of salinity regime.
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