Seasonal carbonate system vis-à-vis pH and Salinity in selected tropical estuaries: Implications on polychaete diversity and composition towards predicting ecological health

Sarathy, Palanivel Partha; Bharathidasan, Veeraiyan; Perumal, Murugesan; Punniyamoorthy, Rengasamy

doi:10.1016/j.oceano.2022.01.001

Cited by 11 publications

(3 citation statements)

References 66 publications

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“…A feasible explanation for the non-significant effect of temperature on biomass yields found in the Lng2 strain could be related to the estuarine origin of that strain ( Table 2 ). As an estuary is a dynamic ecosystem, its marine population is constantly subjected to physicochemical changes [ 64 ]. These adaptability traits [ 65 , 66 ] could account for the behavior of the Lng2 strain (isolated from an estuary) whose biomass yield is not affected by the assayed temperatures.…”

Section: Discussionmentioning

confidence: 99%

Screening and Identification of Coastal Chilean Thraustochytrids for Arachidonic Acid Production: Biotechnological Potential of Ulkenia visurgensis Lng2-Strain

et al. 2023

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Thraustochytrids are unicellular heterotrophic marine protists that have been described as producing a high content of polyunsaturated fatty acids (PUFAs). Among them, arachidonic acid (ARA) stands out as a precursor of several mediators of pivotal importance for the immune system. However, the biotechnological potential of thraustochytrids for ARA production has not been developed. The objective of this study is to isolate and identify native strains from different Chilean coastal environments and evaluate in vitro the effect of culture parameters such as C/N ratio (19 and 33) and temperature (15 °C and 23 °C) on biomass production and arachidonic acid content. A total of nine strains were identified and classified into four genera of the Thraustochitridae family. The Lng2 strain with 99% identity belongs to the species Ulkenia visurgenis and was the most prominent one for ARA production. Temperature had an effect on the PUFA profile but not on the ARA content nor on the biomass yield. Additionally, the C/N ratio has been identified as a key parameter. The ARA productivity increased by 92% (from 0.6 to 8.3 ARA mg/g-DW) and its total biomass by 62.7% (from 1.9 to 5.1 g/L) at a high C/N ratio (33) as compared to the control.

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Section: Discussionmentioning

confidence: 99%

Screening and Identification of Coastal Chilean Thraustochytrids for Arachidonic Acid Production: Biotechnological Potential of Ulkenia visurgensis Lng2-Strain

et al. 2023

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“…In coastal waters, the pH usually varies with salinity; however, we did not nd a direct correlation between those variables, whose response may be de ned by the tidal regime within the system, the temporal pattern of rainfall and the contribution of nutrients by tributary rivers. The role of the salinity-pH gradient in estuaries is widely used in studies to explain ecological patterns of biotic communities (Sarathy et al 2022).…”

Section: Discussionmentioning

confidence: 99%

Effect of Mangrove Complexity and Environmental Variables on Fish Assemblages Across a Tropical Estuarine Channel of the Mexican Pacific

et al. 2023

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It is assumed that the structural complexity of mangroves plays a determining role on sh assemblages in that ecosystem. However, there is limited evidence for how the interaction between the mangroves and environmental variables affects the assemblage structure and composition, abundance and biomass of sh. The main goal of this study was to test whether sh assemblages vary between sectors of mangroves located at different distances from the mouth of the estuary and between root microhabitats and seasons, and to analyze the role of environmental characteristics in these variations. In the Boca del Cielo-San José estuarine channel (Chiapas, Mexico), sh assemblages were sampled during high tide during 2019-2020, within mangroves in three sectors of the channel (lower, middle and upper), while mangrove complexity index, dominance of stilt roots or pneumatophores, litterfall production and six physicochemical parameters of the water were measured. Our results showed that sh assemblages varied signi cantly between sectors, microhabitats and seasons. Lower sector sites dominated by stilt root microhabitats presented the highest species richness, abundance and biomass of sh, while more than 90% of the juvenile sh in the samples were associated with pneumatophores. We found that the interaction of salinity, depth, distance from the estuary mouth, litter production, and dominance of aerial roots or pneumatophores explained patterns of sh abundance and biomass in mangroves. Our observations coincide with other studies in emphasizing the importance of mangroves as nursery and feeding sites for sh, but whose structure is de ned by local variables and factors, which must be taken into account in research and management programs.

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“…Many tropical estuaries, particularly in South and Southeast Asia, are polluted and over-exploited (Bae et al, 2017;Sarathy et al, 2022). In India, the estuaries have been reported with altered or degraded environmental quality owing to the inadvertent growth of industries and metropolises on the banks of the major rivers (Sigamani et al, 2015;Feebarani et al, 2016;Mulik et al, 2017;Mitra et al, 2018;Mulik et al, 2020a;Mulik et al, 2020b).…”

Section: Introductionmentioning

confidence: 99%

Macrobenthic community of an anthropogenically influenced mangrove associated estuary on the East coast of India: An approach for ecological assessment

et al. 2022

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The Mahanadi Estuarine System (MES), with a complex network of freshwater channels, rivers, and mangroves, is a leading seaport in State Odisha on the east coast of India, but subjected to intense human activity in recent years. Such anthropic impingements are known to impact sediment-dwelling biota adversely. However, information on the macrobenthic community of the MES is not well documented yet. Therefore, the primary objectives of this study (February 2013-March 2017) were to address knowledge gaps on the macrobenthic community structure vis-à-vis local environmental conditions and to evaluate the extent of anthropogenic disturbances on macrobenthos. The results from 264 benthic grab samples (van Veen, 0.04 m2; 2 replicates × 12 GPS fixed locations × 3 seasons) revealed 73 taxa representing 64 genera and 48 families of macrobenthic fauna. The polychaetes (81.41%) and crustaceans (15.42%) were significant faunal groups that contributed mainly to the benthic population and diversity. Multivariate approaches using benthic community attributes and biotic indices (AMBI and M-AMBI) as proxy measures of environmental disturbances proved effective for appraisal. The correlations between the environmental parameters (temperature, pH, salinity) and community estimates were statistically significant. Hierarchical clustering analysis disclosed three major groups (Global R 0.70; p < 0.002) influenced by tolerant/opportunist species. The lower abundance, richness, diversity, and dominance of opportunistic species mark the signs of environmental stress. The community health status remained unbalanced, as indicated by AMBI scoring. M-AMBI analysis contributed best in differentiating areas exposed to diverse impacts and indicated polluted community health status with moderate ecological quality. Our results reiterate the effective use of macrobenthos as bioindicators for ecological status and monitoring. The findings could be utilized for future monitoring assessments, translated into valuable information, and designed into well-defined sustainable management strategies for the MES.

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Seasonal carbonate system vis-à-vis pH and Salinity in selected tropical estuaries: Implications on polychaete diversity and composition towards predicting ecological health

Cited by 11 publications

References 66 publications

Screening and Identification of Coastal Chilean Thraustochytrids for Arachidonic Acid Production: Biotechnological Potential of Ulkenia visurgensis Lng2-Strain

Screening and Identification of Coastal Chilean Thraustochytrids for Arachidonic Acid Production: Biotechnological Potential of Ulkenia visurgensis Lng2-Strain

Effect of Mangrove Complexity and Environmental Variables on Fish Assemblages Across a Tropical Estuarine Channel of the Mexican Pacific

Macrobenthic community of an anthropogenically influenced mangrove associated estuary on the East coast of India: An approach for ecological assessment

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