Phytoplankton in Relation to Pollution in Uppanar Estuary Southeast Coast of India

., R. Periyanayagi; Sasikala, V.; Venkatesan, R.; ., R. Karthikayen; Balasubramanian, T.

doi:10.3923/rjet.2007.153.157

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…The total phytoplankton density exhibits a high seasonal variation, with autumn the most fertile season (average 70435 cells l -1 ). The maximum abundance was found at the bay areas where the species diversity was low as a result of high nutrient availability, similar to Periyanayagi et al (2007), a high species number is not so necessarily accompanying high phytoplankton abundance. Compared with the previous data in Gulf of Suez (Madkour et al, 2010), and in the Suez Bay (Nassar et al, 2016), the present maximum density is greater by 1.62-8.52 fold increase, representing an indicator for progressive eutrophication development.…”

Section: Phytoplankton Abundancementioning

confidence: 55%

Seasonal dynamics of phytoplankton in the northern part of Suez Gulf, Egypt

El-Sheekh,

Abu-Faddan,

Abo-Shady

et al. 2023

Environ Monit Assess

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This study was conducted to evaluate the seasonal variability of phytoplankton in the northern part of the Gulf of Suez (Suez Bay), considering the contribution of physicochemical parameters of bay water in shaping the dynamics, and eutrophication assessment. Water and phytoplankton samples were collected seasonally at nine stations in the Suez Bay during the period from the winter to autumn of 2012. A total of 423 phytoplankton species were identified, comprised mainly of 224 diatoms, 127 dinoflagellates, 33 cyanophytes, 20 chlorophytes, and 9 euglenophytes; the rest of the species (10 species) belong to other six groups. Of these, 28 species were potentially harmful. The total phytoplankton abundance exhibits a significant seasonal variation, with the autumn being the most fertile season, followed by the winter due to the proliferation of diatom species Thalassionema nitzschioides and Proboscia alata f. gracillima, respectively. While the seasonal species richness indicates that the winter attained the highest number of species, followed by summer. Generally, the major diatom genera were Chaetoceros (16 species), Navicula (15 species), Nitzschia (15 species), and Amphora (14 species), while dinoflagellates were principally composed of the genera Protoperidinium (34 species), and Tripos (26 species). Water temperature, pH, salinity, nitrate, and nitrite were the most important explanatory parameters in regard to phytoplankton abundance and chlorophyll a concentration. In addition, the phytoplankton stability exhibited a significant positive relationship with the mean values of dissolved oxygen and biological oxygen demand and the variability of salinity and phosphate, while a negative relationship was observed with ammonia and nitrite and the variability of nitrate. Based on the trophic index (TRIX), the bay water was classified as mesotrophic (moderately polluted) for almost the entire year except in the autumn as it turned eutrophic. The results explored the potential importance of the environmental heterogeneity in the bay as a key structuring mechanism of phytoplankton abundance and biomass, influenced by anthropogenic activities.

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Section: Phytoplankton Abundancementioning

confidence: 55%

Seasonal dynamics of phytoplankton in the northern part of Suez Gulf, Egypt

El-Sheekh,

Abu-Faddan,

Abo-Shady

et al. 2023

Environ Monit Assess

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“…Hypoxia and algal blooms have been observed along the coastlines of the BOB LME (Buapet et al 2008;Das et al 2004; Lee and Bong 2006;Meybeck and Helmer 1989;Periyanayagi et al 2007). …”

Section: Introductionmentioning

confidence: 99%

Modeling sources of nutrients in rivers draining into the Bay of Bengal—a scenario analysis

et al. 2017

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We model future trends in river export of nutrients to the Bay of Bengal, and the sources of this pollution. We focus on total nitrogen (TN), total phosphorus (TP), and dissolved silica (DSi) inputs to the Bay of Bengal Large Marine Ecosystem (BOB LME) in the years 2000, 2030, and 2050. In 2000, rivers exported 7.1 Tg N and 1.5 Tg P to the BOB LME. Three rivers (Ganges, Godavari, Irrawaddy) account for 75-80% of the total river export of N and P. For 2050, we calculate an increase in river export of N to 8.6 Tg, while P export stabilizes at the 2000 level. Future trends are the net effect of increasing river export of dissolved N (by 40%) and P (by 80%), and decreasing river export of particulate N and P. The increases in dissolved N and P loads are associated primarily with increased N and P losses from agriculture and sewage systems. The decreasing export of particulate N and P is associated with damming of rivers and increased human water consumption. There are large differences in nutrient export among rivers. Rivers draining into the western BOB LME generally export more N and P than eastern BOB LME rivers. Most N and P in western BOB LME rivers are from anthropogenic sources. Future increases in dissolved inorganic N and P (DIN and DIP) export can be large for individual rivers: up to more than a factor of five for DIP and more than a doubling for DIN. The calculated nutrient export ratios (N and P relative to DSi) indicate an increasing risk for blooms of non-siliceous algal species, which can potentially produce toxins and otherwise disrupt coastal ecosystems. Our results indicate that basin-specific management may be the most effective approach towards reducing the risk of coastal eutrophication in the BOB LME.

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