Article

Estuaries and Coasts

, Volume 33, Issue 2, pp 384-394

First online:

Comparative Analysis of Phytoplankton Composition and Abundance over a Two-Decade Period at the Land–Ocean Boundary of a Tropical Mangrove Ecosystem

  • Haimanti BiswasAffiliated withDepartment of Marine Science, Calcutta University
  • , Mitali DeyAffiliated withDepartment of Marine Science, Calcutta University
  • , Dipnarayan GangulyAffiliated withDepartment of Marine Science, Calcutta University
  • , Tarun K. DeAffiliated withDepartment of Marine Science, Calcutta University
  • , Sandip GhoshAffiliated withDepartment of Marine Science, Calcutta UniversityB.P.Poddar Institute of Management and Technology
  • , Tapan K. JanaAffiliated withDepartment of Marine Science, Calcutta University Email author 

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Abstract

Inter-annual variations of phytoplankton abundance and community organization were observed over a two-decade period along with the ancillary parameters at the land–ocean boundary associated with the Sundarban mangrove forest (21°32′ and 22°40′ N and 88°05′ and 89° E), along the NE Coast of the Bay of Bengal. The number of definable Bacillariophyceae species exceeded Dinophyceae taxa, and the total number of bloom-forming species declined from a maximum of ten in 2000 and a minimum of two in 2007. Blooms of the diatom Coscinodiscus radiatus were common in 2000 and 2007. Tide cycles and the onset of the monsoon season played important roles in diurnal and seasonal variability of phytoplankton. Phytoplankton biovolume showed seasonality, with the highest levels during post-monsoon periods and lowest levels during the monsoon period. Phytoplankton abundance was correlated to rainfall patterns, which may be altered by long-term changes in climate.

Keywords

Phytoplankton dynamics Inter-annual variation Mangrove