Temporal population dynamics of dinoflagellate Prorocentrum minimum in a semi-enclosed mariculture pond and its relationship to environmental factors and protozoan grazers |
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| Authors: | Henglong Xu Gi-Sik Min Joong-Ki Choi Mingzhuang Zhu Yong Jiang Khaled A S Al-Rasheid |
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| Institution: | (1) Horn Point Laboratory, University of Maryland Center for Environmental Science, P.O. Box 475, Cambridge, MD 21613, USA;(2) Center of Marine Biotechnology, University of Maryland Biotechnology Institute, 701 E. Pratt St., Baltimore, MD 21202, USA |
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| Abstract: | The ecological processes and interrelationships between protists, either autotrophic or heterotrophic, and environmental factors
in mariculture ponds are largely unknown. This study investigated the temporal dynamics of potentially harmful dinoflagellate,
Prorocentrum minimum (Pavillard) Schiller, and its relationship to physico-chemical factors and protozoan grazers over a complete cycle in a semi-enclosed
shrimp-farming pond near Qingdao, Northern China. P. minimum occurred frequently in low numbers from June to August, followed by a sharp increase from the middle of August, reaching
a single maximum peak value of 2.2×105 cells L−1 in October. Temporal variation in abundance was positively correlated with dissolved nitrogen, but showed a significant inverse
relationship to abundance of the dominant ciliates, Tintinnopsis lohmanni and Askenasia stellaris. The results provide statistical evidence that the number of P. minimum increased with increasing nitrogen, and the suppression or shortening of algal bloom may be associated with protozoan grazers,
such as Tintinnopsis lohmanni, in mariculture ponds. |
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