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Living coccolithophores during the northeast monsoon from the Equatorial Indian Ocean: Implications on hydrography

DRS at CSIR-National Institute of Oceanography

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Title Living coccolithophores during the northeast monsoon from the Equatorial Indian Ocean: Implications on hydrography
 
Creator Guptha, M.V.S.
Mergulhao, L.P.
Murty, V.S.N.
Shenoy, D.M.
 
Subject coccoliths
monsoons
indicator species
hydrography
mixed layer
nutrients (mineral)
upwelling
abundance
check lists
species diversity
biogeochemical cycles
palaeo studies
palaeoenvironments
 
Description Water samples collected at five stations along 931E section (1 degrees N-4 degrees S) during the northeast monsoon (12-15 February 2000) at five depths (surface, 50, 100, 150 and 200 m) in the eastern equatorial Indian Ocean (EEIO) were studied for coccolithophores. This study has yielded 30 species of coccospheres, showing more diversity compared to coccoliths represented by only 18 taxa. High diversity and abundance of coccospheres were observed at the equator and at 2 degrees S. High concentrations of coccoliths were observed at shallow depths (less than 50 m). The most abundant coccolithophore species was Umbellosphaera irregularis followed by Umbilicosphaera sibogae, Gephyrocapsa oceanica and Emiliania huxleyi. The U. irregularis floral assemblage suggested a prevalence of oligotrophic conditions or lack of supply of nutrients into the upper mixed layer (approx. 50 m thick) during the northeast monsoon. However, the relatively higher abundance of Florisphaera profunda at 4 degrees S indicated the prevalence of nutrient injection into the shallower mixed layer through upwelling from deeper depths.
 
Date 2008-02-22T06:20:32Z
2008-02-22T06:20:32Z
2005
 
Type Journal Article
 
Identifier Deep-sea research. Part II. Topical studies in oceanography, Vol.52; 2048-2060p.
http://drs.nio.org/drs/handle/2264/995
 
Language en
 
Rights Copyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Elsevier