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Marine Biology

, Volume 148, Issue 4, pp 693–709 | Cite as

Diatoms of the microphytobenthic community in a tropical intertidal sand flat influenced by monsoons: spatial and temporal variations

  • Smita Mitbavkar
  • Arga Chandrashekar Anil
Research Article

Abstract

Seasonal variations in the microphytobenthic diatom community were investigated in an intertidal sand flat of a tropical marine environment influenced by monsoons. Cores of sediments were collected along the beach gradient: low tide, mid tide and high tide zone up to a depth of 15 cm.. Diatom abundance was lowest during the monsoons and highest during the post-monsoons and the early pre-monsoon season throughout the intertidal transect. Diatom diversity was highest at the mid tide, followed by the high and low tide zones. Diatoms were viable up to a depth of 15 cm throughout the intertidal transect. The diatom community included the pennates, the permanent residents of this area, centric genera, which lead an attached mode of life and also some planktonic genera, brought in from ambient waters. Among the pennates, Navicula and Amphora were the dominant genera whereas in the case of centrics, Thalassiosira dominated the community throughout the intertidal transect down to a 15 cm depth. . Grain size fractions, which served as predictors of some diatom genera changed with tidal zones. The effect of winds on the resuspension of the pennate diatoms was evident only at the low tide zone down to a depth of 5 cm . Chlorophyll a concentration proved to be a good predictor of both pennate and centric diatom abundance at the low tide zone down to a depth of 10 cm and at the mid tide zone down to a depth of 5 cm.. However, even though chlorophyll a concentrations failed to reveal any positive correlation with the diatom abundance at both the deeper sediment layers and the high tide zone, the fact that viable cells were present at these areas reveal that the diatoms adopt survival strategies, contributing significantly to the carbon budgets of such unstable habitats.

Keywords

Intertidal Zone Navicula Diatom Community Amphora Tide Zone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We are grateful to the Director of National Institute of Oceanography for his support and encouragement. We gratefully acknowledge the help of Mr. K. Venkat and our other colleagues. We appreciate the valuable suggestions offered by anonymous reviewers. The first author acknowledges CSIR for providing a Senior Research Fellowship. This work has been funded by ONR Grant No. N000114-94-1-0423 and from an NIO contribution (no. 4034).

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.National Institute of OceanographyDona PaulaIndia

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