Chlorophyll profile of the euphotic zone in the Lakshadweep Sea during the southwest monsoon season


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Authors

  • V K Balachandran Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • C P Gopinathan Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • V K Pillai Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • A Nandakumar Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • K K Valsala Central Marine Fisheries Research Institute, Cochin - 682 014, India

Abstract

The distribution of chlorophyll a, b and c, the inorganic phosphate and nitrite
of the euphotic zone at 56 locations in the Lakshadweep Sea was studied
during the southwest monsoon period of 1990. The average chlorophyll a
concentration varied from 4.62 mg/m^ at the surface to 2.23 mg/m^at 50 m depth
with a column mean of 161 mg/m^ in the euphotic zone. The chlorophyll b
averaged to 2.28 mg/m^ at 10 m to 2.79 mg/m^ at 50 m depths and 115 mg/
m^ in the column. The chlorophyll c varied from 4.03 mg/m^ at the surface to
4.97 mg/m^ at the 20 m depth and showed an average value of 202 mg/m^for
the column. The chlorophyll c was the dominant pigment in the water column
throughout the period of study. The average ratios of chlorophyll c/a and b/
a fell in the range of 1.3 - 2.4 and 0.80 - 1.3 respectively and were positively
correlated with depths in the euphotic zone. The inorganic phosphate values
fluctuated from 0.65 fig at/1 at surface to 1.36 |ig at/1 at 50 m depth with a
mean of 49 mg at/m^ in the water column. The nitrite concentration varied
widely, very often below the level of detection

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Author Biographies

  • V K Balachandran, Central Marine Fisheries Research Institute, Cochin - 682 014, India
    Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • C P Gopinathan, Central Marine Fisheries Research Institute, Cochin - 682 014, India
    Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • V K Pillai, Central Marine Fisheries Research Institute, Cochin - 682 014, India
    Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • A Nandakumar, Central Marine Fisheries Research Institute, Cochin - 682 014, India
    Central Marine Fisheries Research Institute, Cochin - 682 014, India
  • K K Valsala, Central Marine Fisheries Research Institute, Cochin - 682 014, India
    Central Marine Fisheries Research Institute, Cochin - 682 014, India

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Issue

Vol. 44 No. 1 (1997)

Section

Articles

License

The copyright of the articles published in Indian Journal of Fisheries vests with the Indian Council of Agricultural Research, who has the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in these journals. The Council has no objection in using the material, provided the information is being utilized for academic purpose but not for commercial use. Due credit line should be given to the ICAR where information will be utilized.

How to Cite

Balachandran, V. K., Gopinathan, C. P., Pillai, V. K., Nandakumar, A., & Valsala, K. K. (2011). Chlorophyll profile of the euphotic zone in the Lakshadweep Sea during the southwest monsoon season. Indian Journal of Fisheries, 44(1), 29-43. https://epubs.icar.org.in/index.php/IJF/article/view/8874