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A study of the seasonal changes in the dissolved oxygen of the surface waters of the sea on the Malabar Coast

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Relation http://eprints.cmfri.org.in/1758/
 
Title A study of the seasonal changes in the
dissolved oxygen of the surface waters
of the sea on the Malabar Coast
 
Creator Kasturirangan, L R
 
Subject Seawater Analysis
 
Description There is wide recognition at the present day of the importance of hydrographical
investigations, particularly in association with biological studies
of the marine environment. A knowledge of the physics and chemistry of
sea-water is essential for a scientific approach to the fundamental problem of
organic production in the sea and, in certain instances, greatly helps in the
solution of specific problems connected with fisheries. Investigations on the
distribution and seasonal variations of temperature, salinity, dissolved oxygen,
pH and of various inorganic compounds of phosphorus, nitrogen and silicon,
—usually referred to as " nutrient salts,"—have been carried out in many
countries abroad largely in temperate latitudes (Harvey, 1945). Work in
tropical waters has not been on the same scale and most of it is of recent date.
Studies carried out in India and Australia would be found in the publications
of Sewell (1925-32), Orr (1933), Dakin and Colefax (1935), Thompson and
Gilson (1937), Bal et al., (1951), Chidambaram et al. (1951, 1954), Jayaraman
(1951, 1954), Prasad (1952) and Ramamurthy (1953, 1953 a). In regard
particularly to dissolved oxygen, mention may be made of the attempts of
Cooper (1933) and others to derive an index of organic productivity of an
area from values of oxygen production and consumption. " In nature, the
oxygen accumulates in the layers of organic production and thus its fluctuations
in time and space give a measure of the intensity of phytoplankton
outbursts. It can provide only minimal values because the exact quantity
of oyxgen produced is obscured by the respiratory activity of animals and
bacteria, and in case of surface supersaturation some oxygen is given off" to
the atmosphere" (Sverdrup et al, 1942, p. 934). The above quotation
makes evident the usefulness of oxygen values when they are available in required
detail. A simple series of values derived from analysis of surface
samples such as is presented below, has interest from another angle revealing
as it does the broad features of the changes in composition of the sea-water
from season to season and year to year.
 
Publisher CMFRI/ICAR
 
Date 1957
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/1758/1/Article_14.pdf
Kasturirangan, L R (1957) A study of the seasonal changes in the dissolved oxygen of the surface waters of the sea on the Malabar Coast. Indian Journal of Fisheries, 4 (1). pp. 134-149.