Environmental conditions of Chilika Lake during pre and post hydrological intervention: an overview

Sahu, Biraja Kumar; Pati, Premalata; Panigrahy, R. C.

doi:10.1007/s11852-014-0318-z

Cited by 83 publications

(48 citation statements)

References 15 publications

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“…Importantly, in September 2000, an artificial inlet was dredged opened in the Chilika lagoon to restore its declining salinity and biodiversity. This hydrologic intervention had a dramatic effect on the salinity regime, tidal flux, and biodiversity including on the phytoplankton communities of lagoon (Panigrahi et al 2009;Sahu et al 2014). A survey conducted between 2000 and 2001 on the phytoplankton communities using 10-20-μm size plankton net reported 84 species belonging to Cyanophyta, Chlorophyta, Bacillariophyta, Dinophyta, and Rhodophyta (Rath and Adhikary 2008), while another survey undertaken for the period 2001-2003 used a gravity sedimentation method for phytoplankton collection and reported 128 species, mostly represented by Bacillariophyta and Dinophyta (Panigrahi et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal distribution and composition of phytoplankton assemblages in a coastal tropical lagoon: Chilika, India

Srichandan

Kim

Bhadury

et al. 2015

Environ Monit Assess

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The Asia's largest lagoon, Chilika, is a shallow water estuary and a designated "Ramsar" site located in the east coast of India. The spatiotemporal diversity of phytoplankton based on the monthly sampling between July 2011 and June 2012 was investigated in relation to physicochemical variables of the surface water column from 13 stations. The salinity was minimum (average 9) during the monsoon which was primarily due to riverine discharge. As the season progressed towards post-monsoon, average salinity of the whole lagoon reached to 10 which further increased to 20 during pre-monsoon season. A total of 259 species of phytoplankton, mostly dominated by the Bacillariophyta (138 species) followed by Dinophyta (38 species), Chlorophyta (32 species), Cyanophyta (29 species), Euglenophyta (18 species), and Chrysophyta (4 species), were recorded in this study. Different ecological sectors of the lagoon (except the northern sector) were dominated by diatoms, while the northern sector due to its freshwater regime supported large population of euglenoids. Based on the multivariate ordination analysis, salinity regime and light availability played important role in determining the distribution, diversity, and composition of phytoplankton communities. Overall, this study documented a very high diversity of phytoplankton and highlighted the importance of taking extensive sampling in getting a clearer understanding of phytoplankton community structure in less-studied environments such as Chilika lagoon.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal distribution and composition of phytoplankton assemblages in a coastal tropical lagoon: Chilika, India

Srichandan

Kim

Bhadury

et al. 2015

Environ Monit Assess

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“…The lagoon is separated from the Bay of Bengal by a sand bar approximately 60 km long and lost its natural marine connection in 2001 due to siltation. Presently the lagoon maintains its marine connection through two natural and one artificially dredged openings (Sahu et al, 2014). In absence of tidal variation due to limited marine connectivity, prevailing hydrological conditions of the lagoon is controlled by seasonal freshwater influx that happen during monsoon season (July to October).…”

Section: Study Areamentioning

confidence: 99%

Understanding Impact of Seasonal Nutrient Influx on Sedimentary Organic Carbon and Its Relationship With Ammonia spp. in a Coastal Lagoon

Bhadury

Sen

2020

Front. Mar. Sci.

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Nutrient loading from land masses pose a serious threat to coastal ecosystem functioning. In this study the hypothesis involving applicability of a benthic foraminiferal genus, Ammonia as a reliable proxy for tracking sediment organic carbon load was evaluated in Chilika, Asia's largest lagoon. In situ environmental parameters namely water temperature, pH, dissolved oxygen and salinity were measured from surface water and from sediment water interface along with measurements of dissolved form of nutrients from six stations of Chilika for a period of 12 months. Besides, sediment samples were collected and analyzed for elucidating total benthic foraminifer communities representing 0-2 cm fraction from all the above stations. Along with benthic foraminifera, pore water was extracted from 0 to 2 cm sediment from each station and subsequently analyzed to determine salinity, pH and dissolved form of nutrients as well as collected sediment (0-2 cm) from each station was analyzed for organic carbon (C org) content including source characterization (stable isotope of δ 13 C) for the entire study period. Ammonia population representing live and dead ones was also enumerated from the surface of the sediment column. The investigation revealed that concentration of dissolved nitrate were high in both surface (Max. 86.25 µM, Min. 19.5 µM) and bottom (Max. 90.17 µM, Min. 26.75 µM) while in pore water it was higher in pre-monsoon month of June (Max. 131.67 µM, Min. 68.33 µM). Stable isotopic ratios of carbon (δ13C) from sediments varied within a narrow range (Max. −20.7, Min. −24.2) and did not exhibit any seasonal pattern but supported the idea of nutrient driven increased primary production. Organic carbon (C org) content showed trends with seasonal oscillation during pre-monsoon (Max. 5.66%, Min. 2.87%) and post-monsoon months (Max. 3.88%, Min. 2.66%) in one of the studied stations. Out of 72 sediment samples, 46 samples had stained individuals of Ammonia spp. which were considered living at the time of collection, while 53 samples had dead specimens. Pearson's correlation coefficient analysis showed that assemblages of Ammonia spp. were linked with sedimentary organic carbon and could be used as a reliable proxy for tracking sedimentary organic carbon loading in lagoons.

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“…Plastics, another key indicator of the Anthropocene period, are increasingly found in sediments and water bodies endangering fish, marine mammal and bird populations (e.g. in the Chilika lagoon [Sahu et al 2014]).…”

Section: Indicators Of the Anthropocenementioning

confidence: 99%

The Mahanadi Delta: A Rapidly Developing Delta in India

Hazra

Das

Ghosh

et al. 2019

Deltas in the Anthropocene

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The Mahanadi Delta (Fig. 3.1), located in the state of Odisha on the east coast of India, is a composite delta fed by water, sediments and nutrients from a network of three major rivers: the Mahanadi River (and its distributaries; the Devi, Daya, Bhargavi, Kushbhandra and Parchi) and the adjoining Brahmani and Baitarini Rivers (Kumar and Bhattacharya 2003). The 851 km long Mahanadi River has one of the largest drainage basin on the east coast of India (Fig. 3.1 inset) 3

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Environmental conditions of Chilika Lake during pre and post hydrological intervention: an overview

Cited by 83 publications

References 15 publications

Spatiotemporal distribution and composition of phytoplankton assemblages in a coastal tropical lagoon: Chilika, India

Spatiotemporal distribution and composition of phytoplankton assemblages in a coastal tropical lagoon: Chilika, India

Understanding Impact of Seasonal Nutrient Influx on Sedimentary Organic Carbon and Its Relationship With Ammonia spp. in a Coastal Lagoon

The Mahanadi Delta: A Rapidly Developing Delta in India

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