Biophysical implications of the freshwater influx over small spatial scale in the coastal waters along the southwest coast of India during the Southwest Monsoon

2021 ◽  
pp. 104337
Author(s):  
S. Santhikrishnan ◽  
R. Jyothibabu ◽  
K.J. Albin ◽  
K.T. Alok ◽  
C. Karnan ◽  
...  
Keyword(s):  
Spatial Scale ◽  
Coastal Waters ◽  
Southwest Monsoon ◽  
Small Spatial Scale ◽  
Southwest Coast Of India ◽  
Southwest Coast

Occurrence of a multi-species diatom bloom dominated by Proboscia alata (Brightwell) Sandstorm along the southwest coast of India

2013 ◽  
Vol 42 (1) ◽  
Author(s):  
Lathika Cicily ◽  
K. Padmakumar ◽  
C. Asha Devi ◽  
V. Sanjeevan
Keyword(s):  
Cell Density ◽  
Coastal Waters ◽  
Monsoon Season ◽  
Late Summer ◽  
Nutrient Concentrations ◽  
Diatom Bloom ◽  
Southwest Coast Of India ◽  
Southwest Coast ◽  
Toxic Species ◽  
A Cell

AbstractThe present communication reports on the occurrence of a multi-species diatom bloom in the upwelled waters along the southwest coast of India. During the late summer monsoon season (September 2009) a multi-species diatom bloom with a pale green discoloration of the sea surface was observed in the coastal waters of southwest coast of India. The bloom spread over an area of approximately 15 km2 along the coastal waters off Kannur (Lat. 11°59.471 N, Long. 75°03.446 E). Total diatom cell density of the bloom area was 16 × 104 cells l−1. Proboscia (=Rhizosolenia) alata (Brightwell) Sandstrom constituted 90% of the total phytoplankton population. Other phytoplankton groups that contributed to the bloom population included Chaetoceros spp., Pseudo-nitzschia spp., Rhizosolenia spp., Coscinodiscus sp., Leptocylindrus danicus, Thalassiosira sp., and Bacteriosira sp. Among these Pseudo-nitzschia multiseries, a toxic species with the ability to produce potent neurotoxin domoic acid, was observed with a cell density of 4 × 103 cells l−1. Surface chlorophyll a concentration of the bloom region was 14.1 μg l−1. Nutrient concentrations of the bloom area were 0.01 μmol l−1 for NO2-N, 0.1 μmol l−1 for NO3-N, 0.83 μmol l−1 for PO4-P and 11.44 μmol l−1 for SiO4.

scholarly journals Socio-economic analysis of finfish culture in cages in coastal waters of Kerala, southwest coast of India

2020 ◽  
Vol 62 (1) ◽  
pp. 54-59
Author(s):  
K. C. Vineetha Valsalan ◽  
◽  
V. Kripa ◽  
Shelton Padua ◽  
R. Narayanakumar ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Coastal Waters ◽  
Southwest Coast Of India ◽  
Southwest Coast

scholarly journals High Incidence of Lysogeny in the Oxygen Minimum Zones of the Arabian Sea (Southwest Coast of India)

Viruses ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 588 ◽  
Author(s):  
Ammini Parvathi ◽  
Vijayan Jasna ◽  
Sreekumar Aparna ◽  
Angia Pradeep Ram ◽  
Vijaya Aswathy ◽  
...  
Keyword(s):  
Arabian Sea ◽  
Vertical Gradient ◽  
Southwest Monsoon ◽  
Viral Lysis ◽  
Southwest Coast Of India ◽  
Oxygen Minimum Zones ◽  
Southwest Coast ◽  
Infected Cells ◽  
Virus Interactions ◽  
Oxygen Minimum

Though microbial processes in the oxygen minimum zones (OMZs) of the Arabian Sea (AS) are well documented, prokaryote-virus interactions are less known. The present study was carried out to determine the potential physico-chemical factors influencing viral abundances and their life strategies (lytic and lysogenic) along the vertical gradient in the OMZ of the AS (southwest coast of India). Water samples were collected during the southwest monsoon (SWM) season in two consecutive years (2015 and 2016) from different depths, namely, the surface layer, secondary chlorophyll a maxima (~30–40 m), oxycline (~70–80 m), and hypoxic/suboxic layers (~200–350 m). The high viral abundances observed in oxygenated surface waters (mean ± SD = 6.1 ± 3.4 × 106 viral-like particles (VLPs) mL−1), drastically decreased with depth in the oxycline region (1.2 ± 0.5 × 106 VLPs mL−1) and hypoxic/suboxic waters (0.3 ± 0.3 × 106 VLPs mL−1). Virus to prokaryote ratio fluctuated in the mixed layer (~10) and declined significantly (p < 0.001) to 1 in the hypoxic layer. Viral production (VP) and frequency of virus infected cells (FIC) were maximum in the surface and minimum in the oxycline layer, whereas the viral lysis was undetectable in the suboxic/hypoxic layer. The detection of a high percentage of lysogeny in suboxic (48%) and oxycline zones (9–24%), accompanied by undetectable rates of lytic viral infection support the hypothesis that lysogeny may represent the major survival strategy for viruses in unproductive or harsh nutrient/host conditions in deoxygenated waters.

Step-up multiple regression model to compute Chlorophyll a in the coastal waters off Cochin, southwest coast of India

2007 ◽  
Vol 139 (1-3) ◽  
pp. 217-226 ◽  
Author(s):  
K. K. Balachandran ◽  
K. V. Jayalakshmy ◽  
C. M. Laluraj ◽  
Maheswari Nair ◽  
Thresiamma Joseph ◽  
...  
Keyword(s):  
Regression Model ◽  
Multiple Regression ◽  
Chlorophyll A ◽  
Coastal Waters ◽  
Multiple Regression Model ◽  
Southwest Coast Of India ◽  
Southwest Coast

Impact of Natural and Anthropogenic Disturbances on the Benthic Ecological Quality of the Coastal Waters of Kochi, Southwest Coast of India

2018 ◽  
Vol 12 (6) ◽  
pp. 861-875 ◽  
Author(s):  
Sura Appala Naidu ◽  
Gijjapu Durga Rao ◽  
Kanuri Vishnu Vardhan ◽  
Munnooru Kumaraswami ◽  
Vinjamuri Ranga Rao ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Anthropogenic Disturbances ◽  
Ecological Quality ◽  
Southwest Coast Of India ◽  
Southwest Coast
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