Study on Environmental Implications and Its Impact on Aquatic Productivity in the Southwest Coastal Region

Abstract

An experiment was conducted on environmental implications and its impact on aquatic productivity in the southwest coastal region for a period of 2 months (May-June/2013). Five Rivers such as Pira River, Andarmanik River, Sonatala River, Khaprabhanga River and Rupsaha River were selected for sample collection and were treated as T 1 , T 2 , T 3 T 4 and T 5. Three sampling sites were selected from each River based on salinity. The overall mean values of water temperature were 28.17 ±0.98, 27.41 ±1.21, 28.12 ± 1.11 and 27.13 ± 1.26, 26.62 ± 1.01 0 C in treatment T 1 , T 2 , T 3, T 4 and T 5, respectively. The mean values of water transparency of treatments T 1 T 2 T 3 T 4 and T 5 were 36.00±1.26, 31.0±0.0894, 34.00±1.94, 28.00±1.46 and 31.00±1.86cm, respectively. The overall mean values of water temperature were 6.56 ± 0.12, 6.47 ±0.23, 6.34 ± 0.12, 6.19 ± 0.22, and 6.67 ± 0.29 ppm in treatment T 1 , T 2 , T 3, T 4 and T 5 respectively. pH values were found to fluctuate from 6.72 to 7.64, 6.48 to 7.13, 6.95 to 7.35 and 6.86 to 7.6 in treatment T 1 , T 2 , T 3, T 4 and T 5 respectively . Mean values of total salinity were 2.17 ±0.12, 6.17 ±0.82, 7. respectively. There were no significantly different of temperature, dissolved oxygen pH and alkalinity among the treatments but significance difference found in transparency, salinity, hardness, ammonia, nitrite using ANOVA (P<0.05). Ammonia and nitrite concentration of Rupsha River (T 5 ) higher than other four Rivers due to municipal waste product of Khulna city. A proportionally strong relationship was found among salinity, transparency and hardness. Highest concentration of phytoplankton was found in Rupsha River (lowest salinity) and lowest phytoplankton concentration was found in Khaprabhanga River (highest salinity).

Summer Season Water Temperature Modeling under the Climate Change: Case Study for Fourchue River, Quebec, Canada

“…These studies can be divided into several topics: freshwater [18,20,21], saltwater [22][23][24], river [20,25,26], lake [27,28], ocean [29,30], global scale [21], etc. Furthermore, recent studies also have discussed water temperature change and its effect due to climate change on the aquatic environment such as ecosystem productivity [31,32] and biodiversity [24,33,34]. In particular, cold water species are studied more extensively because several climate change scenarios indicate that some rivers may approach their upper tolerance limit [35][36][37].…”