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1. Spatio-temporal variability in macrobenthic communities and trophic structure of a tropical estuary and its adjacent coastal waters

Author:
Madhu, N. V.,   et al.   ; Rehitha, T. V.; Vineetha, G.; Vipindas, P. V.; Resmi, P.; Revichandran, C.;     Show all 6 Authors
Source:
Environmental monitoring and assessment 2019 v.191 no.6 pp. 341
ISSN:
0167-6369
Subject:
Polychaeta; carnivores; coastal water; community structure; dominant species; estuaries; fauna; food availability; monsoon season; salinity; sediments; spatial distribution; temporal variation; texture
Abstract:
... Spatio-temporal distribution of the macrobenthic community (> 500 μm) and the trophic ecology of polychaetes were studied for a year in the Cochin estuary (CE) and its adjacent coastal waters. A profound influence of the southwest monsoon (SWM) was evident in the CE, a tropical monsoonal estuary, during the present study. The sediment texture and macrobenthic density exhibited a pronounced spatial ...
DOI:
10.1007/s10661-019-7460-x

2. Effects of hydrography on the distribution of bacteria and virus in Cochin estuary, India

Author:
Madhu, N. V.,   et al.   ; Parvathi, Ammini; Jasna, V.; Jina, S.; Jayalakshmy, K. V.; Lallu, K. R.; Muraleedharan, K. R.; Naveen Kumar, K. R.; Balachandran, K. K.;     Show all 9 Authors
Source:
Ecological research 2015 v.30 no.1 pp. 85-92
ISSN:
0912-3814
Subject:
ammonium nitrogen; bacteria; chlorophyll; dissolved oxygen; estuaries; hydrology; monitoring; nitrate nitrogen; nutrients; pH; plate count; salinity; statistical analysis; temperature; viruses; water quality; India
Abstract:
... The viral dynamics have rarely been investigated in estuarine environments of India. The present study brings out a first hand information on the distribution of virus and bacteria in an eutrophic estuary (Cochin, India). Thirteen stations were selected for monthly monitoring of bacterial abundance (BA), total viable bacterial count (TVC), viral abundance (VA), chlorophyll a (Chl a) and other wate ...
DOI:
10.1007/s11284-014-1214-6

3. Why do satellite imageries show exceptionally high chlorophyll in the Gulf of Mannar and the Palk Bay during the Norteast Monsoon?

Author:
Madhu, N. V.,   et al.   ; Jyothibabu, R.; Jagadeesan, L.; Anjusha, A.; Mohan, Arya P.; Ullas, N.; Sudheesh, K.; Karnan, C.;     Show all 8 Authors
Source:
Environmental monitoring and assessment 2014 v.186 no.11 pp. 7781-7792
ISSN:
0167-6369
Subject:
chlorophyll; color; dissolved organic matter; moderate resolution imaging spectroradiometer; monsoon season; multivariate analysis; reflectance; remote sensing; turbidity; Bay of Bengal; India; Sri Lanka
Abstract:
... The Gulf of Mannar (GoM) and the Palk Bay (PB) are two least studied marine environments located between India and Sri Lanka. Exceptionally high chlorophyll a concentration in the GoM and the PB during the Northeast Monsoon (November–February) is a consistent feature in satellite imageries, which has been attributed to the intrusion of the Bay of Bengal (BoB) waters. The analyses of the Moderate R ...
DOI:
10.1007/s10661-014-3966-4
PubMed:
25142503

4. Monsoon-induced changes in the size-fractionated phytoplankton biomass and production rate in the estuarine and coastal waters of southwest coast of India

Author:
Madhu, N. V.,   et al.   ; Jyothibabu, R.; Balachandran, K. K.;     Show all 3 Authors
Source:
Environmental monitoring and assessment 2010 v.166 no.1-4 pp. 521-528
ISSN:
0167-6369
Subject:
biomass production; chlorophyll; cloud cover; coastal water; coasts; estuaries; freshwater; monsoon season; nutrients; photosynthesis; phytoplankton; primary productivity; salinity; turbidity; India
Abstract:
... Changes in the autotrophic pico- (0.2-2 μm), nano- (2-20 μm), and microplankton (>20 μm) biomass (chlorophyll a) and primary production were measured in the estuarine and coastal waters off Cochin, southwest coast of India during the onset and establishment of a monsoon. During this period, the estuary was dominated by nutrient-rich freshwater, whereas the coastal waters were characterized with hi ...
DOI:
10.1007/s10661-009-1020-8
PubMed:
19484365

5. Impact of eutrophication on the occurrence of Trichodesmium in the Cochin backwaters, the largest estuary along the west coast of India

Author:
Madhu, N. V.,   et al.   ; Martin, G. D.; Jyothibabu, R.; Balachandran, K. K.; Nair, Maheswari; Muraleedharan, K. R.; Arun, P. K.; Haridevi, C. K.; Revichandran, C.;     Show all 9 Authors
Source:
Environmental monitoring and assessment 2013 v.185 no.2 pp. 1237-1253
ISSN:
0167-6369
Subject:
Trichodesmium; coasts; estuaries; eutrophication; monsoon season; nitrates; nutrient content; phosphates; phytoplankton; salinity; time series analysis; water quality; Arabian Sea; India
Abstract:
... Phytoplankton studies in early 1970s have shown the annual dominance of diatoms and a seasonal abundance of Trichodesmium in the lower reaches of the Cochin backwaters (CBW) and adjacent coastal Arabian Sea during the pre-summer monsoon period (February to May). Surprisingly, more recent literature shows a complete absence of Trichodesmium in the CBW after 1975 even though their seasonal occurrenc ...
DOI:
10.1007/s10661-012-2628-7
PubMed:
22544039

6. Eutrophication induced changes in benthic community structure of a flow-restricted tropical estuary (Cochin backwaters), India

Author:
Madhu, N. V.,   et al.   ; Martin, G. D.; Nisha, P. A.; Balachandran, K. K.; Nair, M.; Shaiju, P.; Joseph, T.; Srinivas, K.; Gupta, G. V. M.;     Show all 9 Authors
Source:
Environmental monitoring and assessment 2011 v.176 no.1-4 pp. 427-438
ISSN:
0167-6369
Subject:
Polychaeta; anthropogenic activities; benthic organisms; carbon; chlorophyll; community structure; dissolved inorganic nitrogen; estuaries; eutrophication; nutrient content; phosphorus; pollution; principal component analysis; sediments; species diversity; India
Abstract:
... The influence of anthropogenic loading on the distribution of soft bottom benthic organisms of a tropical estuary (Cochin backwaters) was examined. The industrial activities were found to be high in the northern and central part of the estuary, where dissolved inorganic nitrogen (DIN > 210 μM) and phosphorus (DIP > 6.5 μM) have caused high abundance of chlorophyll a (up to 73 mg m ⁻ ³) and accumul ...
DOI:
10.1007/s10661-010-1594-1
PubMed:
20640505

7. CO₂ Supersaturation and Net Heterotrophy in a Tropical Estuary (Cochin, India): Influence of Anthropogenic Effect

Author:
Madhu, N. V.,   et al.   ; Gupta, G. V. M.; Thottathil, Shoji D.; Balachandran, K. K.; Madeswaran, P.; Nair, Shanta;     Show all 6 Authors
Source:
Ecosystems 2009 v.12 no.7 pp. 1145-1157
ISSN:
1432-9840
Subject:
industrialization; mineralization; organic matter; urbanization; monsoon season; carbon; ecosystems; emissions; biogeochemistry; oxygen; estuaries; India; Arabian Sea
Abstract:
... Carbon biogeochemistry of a tropical ecosystem (The Cochin Estuary, India) undergoing increased human intervention was studied during February (premonsoon), April (early monsoon) and September (monsoon) 2005. The Cochin estuary sustains high levels of pCO₂ (up to 6000 μatm) and CO₂ effluxes (up to 274 mmolC m⁻² d⁻¹) especially during monsoon. A first-order estimate of the carbon mass balance shows ...
DOI:
10.1007/s10021-009-9280-2

8. Short-term variability of water quality and its implications on phytoplankton production in a tropical estuary (Cochin backwaters—India)

Author:
Madhu, N. V.,   et al.   ; Balachandran, K. K.; Martin, G. D.; Jyothibabu, R.; Thottathil, Shoji D.; Nair, Maheswari; Joseph, T.; Kusum, K. K.;     Show all 8 Authors
Source:
Environmental monitoring and assessment 2010 v.170 no.1-4 pp. 287-300
ISSN:
0167-6369
Subject:
Closterium; Navicula; Nitzschia; Skeletonema costatum; Thalassiosira; ammonia; biomass; chlorophyll; environmental factors; estuaries; light intensity; monsoon season; nitrogen; nutrient content; phytoplankton; population growth; primary productivity; rivers; seasonal variation; silica; species diversity; time series analysis; turbidity; water quality; water temperature; India
Abstract:
... Changes in the phytoplankton biomass (chlorophyll a), production rate, and species composition were studied over two seasons using the time series measurements in the northern limb of the Cochin estuary in relation to the prevailing hydrological conditions. The present study showed the significant seasonal variation in water temperature (F=69.4, P<0.01), salinity (F=341.93, P<0.01), dissolved inor ...
DOI:
10.1007/s10661-009-1232-y