Occurrence of enhanced herbivory in the microbial food web of a tropical estuary during southwest monsoon

Sooria, P.M.; Menon, Nandini; Ranith, R.; Nair, M.; Anjusha, A.; Shivaprasad, A.; Joseph, K. Ajith; Saramma, A. V.

doi:10.1016/j.ecss.2020.107017

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…However, Mishra et al [22] argued that a reduction in atmospheric nitrogen deposition during the lockdown may have altered the trophic status of coastal ecosystems, thereby reducing phytoplankton growth. In Lake Vembanad, phytoplankton growth is generally not nutrient limited due to high levels of eutrophication [7,64]. Consistent with earlier reports on Lake Vembanad and along the southwest coast of India [22,25] we did not observe clear trends in Chl-a during lockdown, indicating that other factors were more important in controlling phytoplankton growth in Lake Vembanad during this time period.…”

Section: Discussionsupporting

confidence: 90%

Effect of Reduced Anthropogenic Activities on Water Quality in Lake Vembanad, India

et al. 2021

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The United Nation’s Sustainable Development Goal Life Below Water (SDG-14) aims to “conserve and sustainably use the oceans, seas, and marine resources for sustainable development”. Within SDG-14, targets 14.1 and 14.2 deal with marine pollution and the adverse impacts of human activities on aquatic systems. Here, we present a remote-sensing-based analysis of short-term changes in the Vembanad-Kol wetland system in the southwest of India. The region has experienced high levels of anthropogenic pressures, including from agriculture, industry, and tourism, leading to adverse ecological and socioeconomic impacts with consequences not only for achieving the targets set out in SDG-14, but also those related to water quality (SDG-6) and health (SDG-3). To move towards the sustainable management of coastal and aquatic ecosystems such as Lake Vembanad, it is important to understand how both natural and anthropogenic processes affect water quality. In 2020, a unique opportunity arose to study water quality in Lake Vembanad during a period when anthropogenic pressures were reduced due to a nationwide lockdown in response to the global pandemic caused by SARS-CoV-2 (25 March–31 May 2020). Using Sentinel-2 and Landsat-8 multi-spectral remote sensing and in situ observations to analyse changes in five different water quality indicators, we show that water quality improved in large areas of Lake Vembanad during the lockdown in 2020, especially in the more central and southern regions, as evidenced by a decrease in total suspended matter, turbidity, and the absorption by coloured dissolved organic matter, all leading to clearer waters as indicated by the Forel-Ule classification of water colour. Further analysis of longer term trends (2013–2020) showed that water quality has been improving over time in the more northern regions of Lake Vembanad independent of the lockdown. The improvement in water quality during the lockdown in April–May 2020 illustrates the importance of addressing anthropogenic activities for the sustainable management of coastal ecosystems and water resources.

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Section: Discussionsupporting

confidence: 90%

Effect of Reduced Anthropogenic Activities on Water Quality in Lake Vembanad, India

et al. 2021

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Constraints in using relative biomass as a measure of competitive success in phytoplankton – A review

Sooria

Hatha

Menon

et al. 2022

Journal of Experimental Marine Biology and Ecology

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Is the Dilution Technique Underestimating the Picophytoplankton Growth Measurements?

Gong

Mukhanov

et al. 2021

JMSE

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In oceanic communities, picophytoplankton often dominates phytoplankton biomass and productivity. Diel variations in picophytoplankton abundance and growth have been well documented. In the current study, we used flow cytometry to assess the short-term variations (3 h) of the abundance of the most dominant picophytoplankton, Synechococcus spp. and picoeukaryotes, in the coastal regions of northeastern Taiwan. To explore the change in growth and mortality rate in the daytime and over 24 h incubation, we performed a two-point modified dilution experiment for measuring growth, viral lysis, and nanoflagellate grazing rate. In this study, the growth rates of picoeukaryotes were 0.21 and 0.06 h−1, and those of Synechococcus spp. were 0.15 and 0.06 h−1 for daytime and 24 h incubation, respectively, and the values were higher at significant levels in the daytime than those for 24 h incubation. These growth rate values of picoeukaryote and Synechococcus spp. after incubation for 24 h were approximately underestimated at 71% and 55%, respectively. This finding suggests that estimates based on 24 h sampling may not accurately reflect the true growth rate of these populations on ecologically relevant timescales.

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Occurrence of enhanced herbivory in the microbial food web of a tropical estuary during southwest monsoon

Cited by 3 publications

References 36 publications

Effect of Reduced Anthropogenic Activities on Water Quality in Lake Vembanad, India

Effect of Reduced Anthropogenic Activities on Water Quality in Lake Vembanad, India

Constraints in using relative biomass as a measure of competitive success in phytoplankton – A review

Is the Dilution Technique Underestimating the Picophytoplankton Growth Measurements?

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