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Journal of Marine Biology
Volume 2011 (2011), Article ID 594684, 7 pages
http://dx.doi.org/10.1155/2011/594684
Research Article

Long-Term Variations in Chlorophyll a and Primary Productivity in Jiaozhou Bay, China

The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

Received 25 October 2010; Accepted 30 March 2011

Academic Editor: Pei-Yuan Qian

Copyright © 2011 Baodong Wang and Zongling Wang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on long-term data of measurements of nutrient and chlorophyll a concentrations as well as estimates of primary production, the response of phytoplankton to nutrient enrichment was evaluated in the highly urbanized Jiaozhou Bay. Results showed that phytoplankton biomass, as indicated by chlorophyll a concentration, did not show a direct linear response to increased nutrient concentrations. Instead, chlorophyll a concentration was maintained at a constant level in the last two decades in Jiaozhou Bay, so did primary productivity. However, a reduction of zooplankton biomass was observed during the same period. Analysis showed that although the scale of phytoplankton blooms might be limited by availability of silicate due to low Si/N ratio and low concentration, top-down control on phytoplankton biomass by bivalve grazing may be an important factor in Jiaozhou Bay ecosystem.