INDIAN HYDROBIOLOGY, VOL.3 No.2, OCTOBER, 2000.
EFFECTIVENESS OF TANK IRRIGATION INSTITUTIONS IN TAMILNADU - C. KARTHIIEYAN AND P.N. ANANTH, DEPARTMENT OF AGRICULTURAL EXTENSION, TAMILNADU AGRICULTURAL UNIVERSITY, COIMBATORE -641003, TAMILNADU - PP. 65 - 69.
Abstract: The present study investigates the effectiveness of tank irrigation institutions in Tamilnadu. To study on these broad objective 80 tanks were selected and the institutions under which they functioned constituted the sample. The results of the study indicate that the formal and informal institutions for tank management have to be strengthened for efficient utilization by the farmers. Ten variables were taken to study the influencing factors towards the effectiveness of tank irrigation institutions. Of the ten variables, storage capacity, institutional status, farmers' participation and well density were found to have significant and positive relationship with the effectiveness of tank irrigation institutions. Five types of problems were identified that were confronted by the tank irrigation institution. Implications of the study were drawn based on the data obtained to improve the effectiveness of tank irrigation institutions.
NEW TAXA OF NITELLA FROM TAMIL NADU - D. SUBRAMANIAN, DEPARTMENT OF BOTANY, ANNAMALI UNIVERSITY, ANNAMALAINAGAR - 608 002, TAMILNADU, INDIA -PP. 71 - 80.
Abstract: During field trips to Puduchattiram, Portonovo, Kodaikanal, Ooty, Sathamangalam, Arasukuzhi and Kolappakkam of Tamilnadu during 1980 to 198, a large number of taxa of Charophyta, namely Nitella leptostachys with two new variety of Nitella verticillata three different forms of a new variety of Nitella gracilis and a new species of Nitella namely N.nilgherensis were collected and these are described here.
SCREENING OF CYANOBACTERIAL STRAINS FOR NATURAL COLOURS- B.D.KAUSHIK, DIVISION OF MICROBIOLOGY, INDIAN AGRICULTURAL RESEARCH INSTITUTE, NEW DELHI- 110 012 - pp. 81 - 84.
Abstract: Forty one species of cyanobacteria including unicellular, colonial, non-heterocystous filamentous, hetreocystous filamentous and heterotrichous were screened for the phycobilin pigments. The total phycobilin content in unicellular or colonial Anacystis nidulans ARM 336, Synechocystis sp. ARM 340, Gloeocapsa rupestris ARM 338, Aphanocapsa pulchra ARM 341 and Chlorogloea frischii ARM 342 produced less than 2.93 percent of dry biomass basis. The non-heterocystous filament forms were also equally poor in total phycobilin content but for Lyngbya versicolor ARM 348, 10.2% total phycobilinas well as c-phycocyanin 74.38 mg of dry biomass. The twenty one species of Calothrix showed greater diversity and produced as low as << 1% to as high as 18.21% by Calothrix brevissima ARM 114. Among the remaining heterocystous forms Anabaena variabilis ARM 310, Aulosira fertilissima ARM 68, Hapalosiphon sp. ARM 419 and Tolypothrix tenuis ARM 76 are the probale cyanobacterial species which can be exploited as the phycobilin content varied from 14.72 to 17.52%. From a total of six heterotrichous forms examined barring Hapalosiphon sp. ARM 419 (14, 72% phycobilin) all produced very little quantity of pigments.
HYDROGRAPHY OF THE NORTHEAST COAST OF INDIA DURING THE SOUTHWEST MONSOON PERIOD- K.M. SANTOSH, A. NANDAKUMAR*, V. HARIHARAN, H.R.V. REDDY AND T.S. ANNAPPASWAMY, * Central Marine Fisheries Research Institute, Cochin and Department of Fishery Oceanography, College of Fisheries, Mangalore - 575 002 - pp. 85 - 88.
Abstract: Observations were made on temperature, salinity and dissolved oxygen from surface to 500 m depth in the shelf and off shelf waters of the northwest region of the Bay of Bengal on board FORV Sagar Sampada during June 1994. The isolines of all the three parameters indicated upwelling in the coastal waters with more intensity in the southern part of the region under investigation. The characteristic features of the waters agreed in general with the earlier observations. However, the near surface salinity stratification consequent to high freshwater inflow, characteristic of the Bay was not observed in the present study.
IMPACT OF AQUACULTURE EFFLUENTS ON DISTRIBUTION OF NUTRIENTS AND PLANT PIGMENTS IN COASTAL WATERS OF VISAKHAPATNAM - Y. SAROJINI, G. SUBBARANGAIAH, E. VANILLA KUMARI, DEPARTMENT OF BOTANY, ANDHRA UNIVERSITY, VISAKHAPATNAM - 530 003, A.P. - pp. 89 - 93.
Abstract: The aquaculture effluents are discharged at a rate of 250 to 300 tonnes / per day / hatchery. These effluents have been observed as hypertrophied with high NO2-N (0.5 to 9.2 µgat/1), NO3-N (0.04 - 4.5), PO4-P (14.0 to 35.0) and SiOH4 - Si (55.0-90.0). Higher concentration of nutrients was also observed in the coastal waters in the vicinity of the industries than in the coastal waters away from these. Seasonal maxima for nitrate and nitrite were observed during summer, phosphate during winter, and silicate during rainy period. The maxima for chlorophyll -a, chlorophyll-b and phaeopigments were observed during summer and minima during rainy period. The maximum for chlorophyll-c and carotenoids were observed during winter. The low dissolved oxygen, higher nutrients and plant pigments indicated hyper nutrification of coastal waters caused by aquaculture effluents in the vicinity of the industries.
ECTOCARPUS BALAKRISHNANI SP. NOV., AN ADDITION TO THE BROWN ALGAL FLORA OF INDIA, V. KRISHNAMURTHY, KRISHNAMURTHY INSTITUTE OF ALGOLOGY, 15, RAMANATHAN STREET, T. NAGAR, CHENNAI - 600 017 - pp. 95 - 96.
Abstract: Ectocarpus rhodochortonoides Boergesen was recorded at Malwan by Balakrishnan and Kinkar (1981). This species has recently been transferred to Asteronema by Mueller and Parodi (1994). But Balakrishnan and Kinker's (1981) record was that of an Ectocarpus and it is here treated as a new species, Ectocarpus balakrishnani.