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Factors affecting variability of heterotrophic and phototrophic microorganisms at high water in a mangrove forest at Cape Rachado, Malaysia.

Lee, Choon Weng, and Bong, Chui Wei, and Ng, Ching Ching, and Siti Aishah Alias, (2006) Factors affecting variability of heterotrophic and phototrophic microorganisms at high water in a mangrove forest at Cape Rachado, Malaysia. Malaysian Journal of Science, 25 (2). pp. 55-66. ISSN 13943065

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Affiliations

University of Malaya. Institute of Biological Sciences, Laboratory of Microbial Ecology
University of Malaya. Institute of Biological Sciences

Abstract

We sampled hourly, surface water in a mangrove forest at Cape Rachado, Port Dickson (in the Straits of Malacca) on four occasions (4 January, 18 April, 25 July and 29 December, 2003). Water level in this intertidal zone was between 0.3 and 1.6 m. Seawater temperature ranged 28 – 33˚C whereas salinity ranged 25 – 33. Dissolved oxygen (DO) concentration was low ranging between 110 and 270 µM, and reflected a reducing environment (as shown by the negative redox potential, –40 to –70 mV). Chlorophyll a (Chl a) varied between 0.80 – 7.0 µg L^–1 whereas ammonium, nitrite, nitrate, phosphate and silicate ranged 0 – 6.50 µM, 0.10 – 0.80 µM, 0.50 – 4.40 µM, 0 – 6.70 µM and 8.79 − 27.27 μM, respectively. For biotic variables, phototrophic picoplankton abundance was relatively stable, ranging between 1.8 – 14.6x10^5 cells mL^–1 whereas bacterial abundance was about one order higher, ranging 0.5 – 28.4x10^6 cells mL^–1. Using principal component analysis, we found that the physical condition of the water could account for both Chl a and phototrophic picoplankton variation whereas inorganic nitrogen was important for phototrophic picoplankton. We also showed through nutrient limitation study that phytoplankton was limited by both P and Si. Bacterial abundance correlated significantly with Chl a (R^2=0.288, n=29, p<0.01) indicating bacteria–phytoplankton coupling.

Item Type:Journal
Keywords:Nutrient limitation for phytoplankton; bacteria–phytoplankton coupling; principal component analysis; Straits of Malacca
Subjects:Q Science
ID Code:1831

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