Allelopathic eff ects of macroalga <i>Corallina pilulifera</i> on the red-tide forming alga <i>Heterosigma akashiwo</i> under laboratory conditions -- Journal of Oceanology and Limnology,2016,34(2):314-321

	Cite this paper:
	WANG Renjun, TANG Xuexi. Allelopathic eff ects of macroalga Corallina pilulifera on the red-tide forming alga Heterosigma akashiwo under laboratory conditions[J]. Journal of Oceanology and Limnology, 2016, 34(2): 314-321

Allelopathic eff ects of macroalga Corallina pilulifera on the red-tide forming alga Heterosigma akashiwo under laboratory conditions

WANG Renjun¹, TANG Xuexi²

1 College of Life Science, Qufu Normal University, Qufu 273165, China;
2 College of Marine Life, Ocean University of China, Qingdao 266003, China

Abstract:

Over the past few years, harmful algal blooms(HABs), such as red tides, have been frequently observed in coastal zones worldwide. The natural allelopathic interactions among macroalgae and red tide microalgae can alter the structure and succession of aquatic ecosystems. We investigated the influence of four environmental factors(temperature, salinity, light, and pH) on the allelopathic effects of the macroalgae Corallina pilulifera on red-tide forming Heterosigma akashiwo under laboratory conditions. Each of the factors had four levels:temperature(15, 20, 25, and 30℃), salinity(10, 20, 30, and 40), light(20, 100, 200 and 400μmol/(m²·s)), and pH(5.5, 7, 8.5, and 10. Two-factor experiments were designed for each two environmental factors, with six combination treatments(temperature-salinity, temperature-light, temperature-pH, salinity-light, salinity-pH, and light-pH). Results showed that the allelopathic effect was significantly influenced by temperature, salinity, light, and pH. As single factors, the low temperature(15℃), low salinity(10), high-intensity light(400μmol/(m²·s)), and high pH(10) treatments substantially enhanced the allelopathic effect. The strongest allelopathic effect of C. pilulifera on H. akashiwo was observed under the following treatments:15℃ and salinity of 40, 25℃ and pH 10, 25℃ with medium-to high-intensity light at 200-400μmol/(m²·s), 400μmol/(m²·s) and salinity of 10, 400μmol/(m²·s) and pH 10, and pH 10 with a salinity of 40.

Key words: Corallina pilulifera|Heterosigma akashiwo|environmental factor|allelopathic eff ect|harmful algal blooms(HABs)

Received: 2014-12-10 Revised: 2015-03-27

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