Impact of human-altered hydrographical setting on the Copepod community structure in an extensive tropical estuary along the southwest coast of India

Nagarathinam, Arunpandi; Jyothibabu, R.; Jagadeesan, L.; SINGARAM, P; Arayillath, Anjusha; Jose, Albin Konnakkamannil

doi:10.1016/j.oceano.2020.10.004

Cited by 17 publications

(2 citation statements)

References 27 publications

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“…The spatial and temporal variation in the community structure of phytoplankton is influenced by the alterations in the physical and Hydrobiological variables in the marine environment [1][2][3]. Research in the recent past from the present study domain shows the strong biophysical coupling between hydrographical parameters and the kind of plankton existing in diverse environments [4][5][6]. The major features of phytoplankton are its shape and size which controls biochemical Functions such as plankton growth and nutrient intake.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal Distribution and Biochemical Composition of Phytoplankton along the Coastal Waters of Dakshin Kannada District, Karnataka, India

Daggula

Naik

2023

IJECC

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The phytoplankton distribution and biochemical composition concerning water quality parameters were studied in the coastal waters off Mangalore, Monthly sampling was carried out from October 2020 to May 2022 at selected stations of Netravathi-Gurupura estuary, latitude 12°50'38.56" N, longitude 74°50'0.23° to coastal waters off Padubidri latitude 13° 8'0. 57" N longitude 74°42'9.47° with an average depth of 8 meters. Spatiotemporally the phytoplankton, chlorophyll-a and phytoplankton biochemical composition showed a significant difference for the entire duration. During the present investigation, 35 different phytoplankton genera belonging to 3 groups were observed with complete domination from diatoms with 27 genera followed by Dinoflagellates 7 and blue-green algae. distribution and abundance of the phytoplankton were mainly Chaetoceros sp., Ceratium sp., Thallasiocera sp., Biddulphia sp., Coscinodiscus sp., Rhizosolenia sp., Ditylum sp., Triceratium sp., Nitzschia sp. and blue-green algae under Chrysophyta, Bryophyta, Chlorophyta, Cyanophyta were observed, while in biochemical composition of phytoplankton, the carbon contributed to the highest percentage and hydrogen constitute to the lowest percentage. Crude protein and Lipid contents are maximum during post-monsoon and carbohydrates showed their highest content during pre-monsoon for phytoplankton. There is a direct relationship between the biochemical composition and the physiochemical and environmental conditions including nutrients, especially nitrates and phosphates.

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Section: Introductionmentioning

confidence: 99%

Spatio-temporal Distribution and Biochemical Composition of Phytoplankton along the Coastal Waters of Dakshin Kannada District, Karnataka, India

Daggula

Naik

2023

IJECC

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“…Copepod assemblages have a temporally heterogeneous composition that changes based on intra-annual environmental modifications between the rainy and dry periods in tropical estuaries [10,11]. An understanding of this intra-annual variation is important in order to describe and quantify the different estuarine communities [12] that alternate Water 2022, 14, 3648 2 of 17 between seasons, and how each community survives unfavorable periods [13].…”

Section: Introductionmentioning

confidence: 99%

Copepod Assemblages at the Base of Mangrove Food Webs during a Severe Drought

Campos

Barroso

Belmonte

et al. 2022

Water

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The effect of severe drought on the functional groups that sustain the base of the mangrove food webs in semi-arid areas is largely unknown. We therefore analyzed the intra-annual variation in the assemblages and functional groups of copepods in a shallow, low-inflow estuary of the Brazilian semi-arid coast when the most severe drought ever occurred. The lowest density was found in April (upstream region) and the highest in August (downstream region). Three main functional groups were identified, sorted by spawning strategy, and further subdivided according to feeding strategy, trophic regime, and diel vertical migration behavior. The community was significantly influenced by the extreme drought period, presenting a temporal homogenization in terms of composition, and an expressive and unexpected increase in density in the dry period, possibly due to phytoplankton blooms resistant to hypersalinity and the occurrence of copepod species adapted to stressful conditions. The few stress-tolerant species sustaining the food webs with seasonal variations were observed simplifying the trophic variability. The results indicate that hypersalinity can induce changes in the zooplankton community, increasing copepod mortality risk and, so, promoting alteration in the trophic estuarine dynamic.

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