NOPR Collection:

Distribution of various forms of Cd, Pb and Cu in the Wadge Bank region(Arabian Sea)

2016-12-15T07:29:16Z

Title: Distribution of various forms of Cd, Pb and Cu in the Wadge Bank region(Arabian Sea) Authors: George, M D Abstract: Labile, nonlabile and particulate forms of Cd, Pb and Cu were determined in 29 water samples collected from a depth of 5 m, from the Wadge Bank area. Labile Cd varied from 0.1 to 0.2 µg.l^-1 while nonlabile fraction was in the range 0.1 to 0.3 µg.l^-1. Nonlabile form of Pb was not detectable at most of the stations and the labile form was within the range 0.78 to 3.5 µg.l^-1. Labile Cu varied from 0.1 to 1.0 µg.l^-1 while nonlabile form was in the range 0.2 to 2.2 µg.l^-1. Particulate Cd, Pb and Cu ranged from 0 to 17.9, 11.3to 81.8 and 9.5 to 130.0 µg.l^-1 (dry wt) respectively. Page(s): 271-273

Suspended-Load versus Bed-Load in Sediment transport in Puri and Madras Beaches, east coast of India

2016-12-15T07:26:10Z

Title: Suspended-Load versus Bed-Load in Sediment transport in Puri and Madras Beaches, east coast of India Authors: Kanth, T A; Asthana, V Abstract: Mode of sediments transport in terms of bed-load or suspended-load is examined. Suspended-load in the surf zone of Puri and Madras beaches constitutes about 10-11% of the total drift while the bed-load accounts for the remaining. These calculations are based on the fact that the suspended grains move with a velocity equal to that of the longshore current. Page(s): 269-270

Distribution of Heterotrophic Bacteria in Vellar Estuary, East coast of India

2016-12-15T07:24:16Z

Title: Distribution of Heterotrophic Bacteria in Vellar Estuary, East coast of India Authors: Kannan, L; Vasantha, K Abstract: Density (x 10³.ml^-1)of heterotrophic bacterial population was highest (10.9) in marine zone followed by gradient (3.75),freshwater (3.4)and tidal (1.9) zones of the estuary, Vibrio, Pseudomonas, Micrococcus, Bacillus and Alcaligenes were the most commonly encountered genera. Particulate organic carbon values (mgC.1^-1 were high in marine zone (0.665) followed by the gradient, freshwater and tidal zones. Higher values of POC coincided with the higher densities of both phytoplankton and bacteria. Chl.a varied from 0.005 to 0.018 mg.m^-3, registering higher value in the gradient zone and lower value in the freshwater zone. Higher density of phytoplankton population was encountered from the marine zone (2,480 cells.1^-1) followed by gradient, tidal and freshwater zones and the phytoplankton density decreased with fall in salinity. Page(s): 267-268

Validity of Zooplankton Biomass estimates & energy equivalent in the Indian Ocean

2016-12-15T07:21:22Z

Title: Validity of Zooplankton Biomass estimates & energy equivalent in the Indian Ocean Authors: Dalal, S G; Parulekar, A H Abstract: Analysis of the published data on zooplankton biomass in the Indian Ocean reveals that due to omission of data from highly productive neritic Waters, the projected values of 519 x 10⁶ tons become underestimated by 91 x 10⁶ tons. Similarly, as deduced from the data on biochemical composition and energy content, it is evident that zooplankton of the Indian Ocean contains on an average 2.7% organic carbon, rather than the widely quoted value of 6.5%. The biomass production in terms of organic carbon estimated to be 3.5 and 12.9 x 10⁶ tons for shelf and offshore regions respectively in the Indian Ocean thus stands corrected. Page(s): 264-266