A study was conducted to find out the possible cause of sudden changes in the colour of the Karapad lagoon water and associated variation in the hydrography. The discolouration of lagoon water was noticed after the excavation work to deepen the lagoon area by the Municipal authorities to enable free boating. Microscopic examination of the lagoon water revealed the blooming of micro alga Chlorella marina. The blooming lasted for a month and has not caused any adverse effect. During the bloom days, the algal cell density attained a peak of 3.1x 105 cells l -1 on 5 th day. Very high chlorophyll concentration was noticed in the lagoon water during the bloom days than the post bloom days. The studies revealed that the nutrient enrichment due to the re-suspension of sediments from the excavation activities might have triggered the algal outburst in the Karapad lagoon. Along with high nutrients, the surface water temperature and salinity might also have supported the algal proliferation.
A study was conducted to evaluate the phytoplankton community structure and its relationship with selected physicochemical variables in the inshore waters of Tuticorin during January to December 2008. Water and plankton samples from the surface waters at two depths (5m and 10m) were collected on board the research vessel Cadalmin-IV. Standard methods were followed for phytoplankton identification, enumeration and estimation of physicochemical variables. The present study recorded 69 species of phytoplankton with 85.5% dominance of diatoms followed by 14.5% of dinoflagellates. The overall density of phytoplankton was comparatively higher at 10 m with a mean of 2.14x10 4 ±0.4x10 4 cells L-1 and 3.37x10 4 ±0.9x10 4 cells L-1 at 5 m and 10 m depth respectively. The analysis indicated that 10 m depth, especially during the monsoon season, is rich in diversity of algal species than at the same depth during post-monsoon. It is confirmed that the population density of phytoplankton is more influenced by seasonal fluctuation of the physicochemical variables especially due to the effect of northeast monsoon in the inshore waters of Tuticorin.
A study was conduced to assess the depth wise variation and influence of lunar cycle and hydrological parameters on the distribution of zooplankton constituents in Tuticorin inshore waters between April 2011 and March 2012. Fortnightly sampling of zooplankton and hydrological parameters at four different depths like 5 m, 10 m, 15 m and 20 m was carried out on every full moon and new moon day to assess the variation. The zooplankton constituents were found in dominance in the order of copepod> decapod>Lucifer>fish eggs>cladocerans> Alima larvae>chaetognatha at all the depths. The swarming of zooplankton constituents were noticed more towards 15 m depth especially during new moon period. The full moon and new moon variation in the density was statistically significant for bivalve larvae and Lucifer (p<0.05) and the depth wise variation was significant only for decapods (p<0.05). The studies indicated that northeast monsoon which starts during late September in Tuticorin influences the environmental conditions as well as the distribution patterns of the zooplankton constituents in the Tuticorin inshore waters.
The aim of the present study was to isolate the Extract from the leaves of Ficus dalhousiae Miq and subse-quently evaluate their antibacterial and antifungal activity. The crude various extracts of the plant n-Hexane, Chloroform, Ethyl acetate, Methanol extract was obtained by using continuous soxhlation tech-nique using soxhlet apparatus. The antibacterial activity of plant extract were carried using cup plate method against three bacterial species Staphylococcus aures, Bacillus subtilis, Escherichia coli using agar diffusion method. those are compared with standard reference drug Ciprofloxacin. This study confirmed that bark extracts have more active constituents compare to leaf extracts. by pharmacological evaluation of Ficus dalhousea Miq. Various extracts, most of them are capable of showing moderate antibacterial activity.
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