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Annual variations in zooplankton from a polluted coastal environment

01 Jan 1980-Vol. 13, Iss: 3, pp 239-248
TL;DR: In this article, seasonal changes in the composition and distribution of zooplankton from the coastal waters of Trivandrum were studied, and it was shown that the effluent discharged from a nearby titanium dioxide factory did not affect the abundance of ZOPs.
Abstract: Seasonal changes in the composition and distribution of zooplankton from the coastal waters of Trivandrum were studied. The study indicated that the effluent discharged from a nearby titanium dioxide factory did not affect the zooplankton abundance. Copepods followed by cladocerans contributed to the bulk of zooplankton. Species composition of zooplankton and their ecology are discussed. Diversity of zooplankton was high in the postmonsoon months and also in April
Citations
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Journal ArticleDOI
TL;DR: In this article, the role of ocean currents in molding mesozooplankton community characteristics in these, geographically closer and ecologically important transitional zones was investigated by collecting data from 30 locations in the Gulf of Mannar and the Palk Bay in March 2010 (Spring Intermonsoon), September 2010 (Southwest Monsoon) and January 2011 (Northeast Monsoon).

92 citations


Cites background from "Annual variations in zooplankton fr..."

  • ...They are opportunistic species capable of exploiting upwelling induced high phytoplankton stock prevailing along the west coast of India during the Southwest Monsoon (Stephen, 1978; Haridas et al., 1980; Madhupratap et al., 1990 &1992; Goswami and Padmavati, 1996)....

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Journal Article
TL;DR: In this paper, a coastal upwelling situation from the central west coast of India was studied and the abundance of zooplankton was found to be dominated by a few species of herbivores and carnivores.
Abstract: Zooplankton composition and abundance were studied in a coastal upwelling situation from the central west coast of India. Upwelling and associated high biomass was found confined to a narrow coastal span. Zooplankton composition was dominated by a few species of herbivores and carnivores and was generally distinct from non-upwelling and offshore waters. Zooplankton had higher aggregations in the shallow upper mixed layer compared to the stratum below. High variability in zooplankton abundance occurred over short periods. Diel patterns in distribution or migration of zooplankton in inshore waters were not detectable.

70 citations

Journal ArticleDOI
30 Mar 2008
TL;DR: In this paper, the microzooplankton (MZP) community was comprised of heterotrophic dinoflagellates, ciliates and copepod nauplii.
Abstract: During the late summer monsoon (LSM), coastal upwelling and river runoff have increased the nutrient concentration in the inshore region of the southeastern Arabian Sea. This has resulted in elevated chlorophyll-a (av. 40±18 mg m−2), phytoplankton abundance (av. 474±116×106 ind. m−2) and primary production (av. 917±616 mg C m−2 d−1). Diatoms were the major component of the phytoplankton community (av. 60±8% of the total abundance) during this period, followed by dinoflagellates (18±12%). However, the inshore locations of 10°N and 13°N transects behaved differently, with an exceptional abundance of phytoflagellates (>1010 ind. m−2). The microzooplankton (MZP) community was comprised of heterotrophic dinoflagellates (av. 60%), ciliates (av. 30%) and copepod nauplii (av. 5%); these showed marked variation in abundance between stations. The highest abundance (av. 283×104 ind. m−2) was at the inshore location of 10°N transect, where phytoflagellates were abundant. Contrasting to the LSM, intense surface layer stratification and depletion of nitrate (with a nitracline at 60 m depth), observed in the southeastern Arabian Sea during the spring intermonsoon (SIM) period, caused low phytoplankton abundance (av. 141±86×106 ind. m−2), chlorophyll-a (av. 19±11 mg m−2) and primary production (av. 146±68 mg C m−2 d−1). High temperature (>29 °C) and nitrate-depleted surface waters favoured the proliferation of Trichodesmium erythraeum at most of the locations. Total abundance of MZP during the SIM was markedly low (av. 20×104±13×104 ind. m−2), as was the species richness and diversity (0.36±0.02 and 0.57±0.15, respectively) compared to the LSM (1.17±0.31 and 2.72±0.34, respectively). During the SIM, the MZP community that occurs in the southeastern Arabian Sea is important, since smaller individuals are widespread and form the majority of phytoplankton community. The present study points also to the fact that the MZP could play an important role, even in nutrient-enriched environment, if smaller phytoplankton are abundant.

68 citations


Cites background from "Annual variations in zooplankton fr..."

  • ...The information available shows a pronounced enhancement in the mesozooplankton biomass along the southwestern coast of India, during the summer monsoon period (Panikkar, 1968; Haridas et al., 1980; Madhupratap and Haridas, 1990)....

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  • ...3 The mesozooplankton community of the southeastern Arabian Sea and its seasonal response are reasonably well known (Panikkar, 1968; Haridas et al., 1980; Madhupratap, et al., 1990; Madhupratap and Haridas, 1990; and Nair et al., 1992)....

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  • ...There is a pronounced enhancement in the mesozooplankton biomass along the southwestern coast of India, during the summer monsoon period (Panikkar, 1968; Haridas et al., 1980; and Madhupratap and Haridas, 1990)....

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  • ...3 The mesozooplankton community of the southeastern Arabian Sea and its seasonal response are reasonably well known (Panikkar, 1968; Haridas et al., 1980; Madhupratap, et al., 1990; Madhupratap and Haridas, 1990; and Nair et al., 1992)....

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  • ...The information available shows a pronounced enhancement in the mesozooplankton biomass along the southwestern coast of India, during the summer monsoon period (Panikkar, 1968; Haridas et al., 1980; Madhupratap and Haridas, 1990)....

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Journal ArticleDOI
TL;DR: In this article, the authors reconsidered the paradox of mesozooplankton (MSP) based on intensive in-situ observations at 39 - 40 locations in the central and eastern Arabian Sea (EAS).

59 citations


Cites background from "Annual variations in zooplankton fr..."

  • ...…during the summer monsoon period (May to September), and attributed this to the result of phytoplankton blooms caused by coastal upwelling (Johansen et al., 1978; Haridas et al., 1980; Raj and Ramamitram, 1981; Madhupratap et al., 1990; Ashadevi et al., 2009 – unpublished; Jyothibabu et al., 2008)....

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Trending Questions (1)
Which zooplanton species impacted more benthic or pelagic from pollution?

The study did not indicate any impact of pollution on zooplankton abundance, so it is unclear which species, benthic or pelagic, were more impacted.