Comparative Study of the Impact of Temperature and Salinity on Growth of Isolated Centric and Pennate Diatoms
2023
Swati Choudhary | Geetanjali Deshmukhe | Shashi Bhushan | B.B Nayak | S.P. Shukla
The present study was conducted with the objective to compare the impact of temperature and salinity on the growth of centric and pennate diatoms. The phytoplankton samples were collected from Manori Creek, Mumbai, during the high tide. Two diatom species, one centric (Cyclotella sp.) and one pennate (Navicula sp.), were isolated for the experiment on growth. A pure stock culture was maintained for 10 days for both species in F/2 media. Then, the diatoms were exposed to three temperatures (24 °C,27 °C, and 30 °C) and salinities (15 ppt, 25 ppt, and 35 ppt) combinations for a period of 10 days. The initial and final number of cells were counted in the Sedgewick rafter cell. The average daily growth rates (K) were calculated and statistical analysis was done by two-way ANOVA to assess the impact of temperature and salinity on growth of the diatoms. These results indicated that salinity had a more pronounced effect on these diatoms than temperature. Navicula sp. showed better growth in varying temperature and salinity conditions. Cyclotella sp. showed good growth in lesser salinities indicating that freshwater is more favorable for its growth. This concludes that pennate diatoms are more adapted to changes in environmental conditions and can show good growth even outside their favourable range of temperature and salinities. Therefore, it is economically feasible to prefer pennate diatoms for feedstock in aquaculture practices
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