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Article
Phytoplankton and Hydrography of the Kennebec Estuary, Maine, USA
Marine Ecology-Progress Series
  • M. W. Wong
  • David Townsend, University of Maine - Main
Document Type
Article
Publication Date
1-1-1999
Abstract/ Summary
The biomass, abundance and species composition of phytoplankton in the Kennebec estuary, Maine, USA, were investigated in relation to hydrography and Light regime during 7 seasonal survey cruises. The salinity distribution ranged from 32 at the mouth to between 0 and 5 at the head, depending on the magnitude of freshwater discharge at the time of each survey. Maximum Vertical salinity and temperature gradients were observed at the mouth. while local tidal mixing, combined with the freshwater flow, produced a well-mixed water column at the head of the estuary. The middle portion of the estuary was stratified on flooding and ebbing tides, but was vertically well mixed at high and low tides. Phytoplankton biomass was lowest in winter (chlorophyll a approximate to 1 mu g l(-1)) and highest in summer (up to 10 mu g l(-1)) The phytoplankton species assemblages at the seaward and the riverine ends of the estuary were made up of taxa with corresponding salinity preferences. Both cell numbers and biomass (chlorophyll a) exhibited a bimodal distribution along the length of the estuary in the warmer months, with the middle portions of the estuary having depressed phytoplankton standing stocks compared with the seaward and landward ends. This bimodal distribution was related to Light limitation and nutrient regeneration in the middle portion of the estuary and to the production of and advective contributions of phytoplankton from both the freshwater and seaward ends.
Citation/Publisher Attribution
Wong MW, Townsend DW. Phytoplankton and Hydrography of the Kennebec Estuary, Maine, USA. Marine Ecology-Progress Series. 1999;178: 133-144.
Publisher Statement
Copyright 1999 Inter-Research.
DOI
10.3354/meps178133
Version
publisher's version of the published document
Citation Information
M. W. Wong and David Townsend. "Phytoplankton and Hydrography of the Kennebec Estuary, Maine, USA" Marine Ecology-Progress Series Vol. 178 (1999) p. 133 - 144
Available at: http://works.bepress.com/david_townsend/5/