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Impact of Temperature, Low pH and NH4+ Enrichment on Ecophysiological Responses of a Green Tide Species Ulva australis Areschoug

Authors
  • Kambey, Cicilia S. B.1, 2
  • Kang, Jin Woo3
  • Chung, Ik Kyo1, 1
  • 1 Pusan National University, Busan, 46241, Korea , Busan (South Korea)
  • 2 University of Malaya, Kuala Lumpur, 50603, Malaysia , Kuala Lumpur (Malaysia)
  • 3 Korean Fisheries Resources Agency, Pohang, 37688, Korea , Pohang (South Korea)
Type
Published Article
Journal
Ocean Science Journal
Publisher
Korea Institute of Ocean Science & Technology and The Korean Society of Oceanography
Publication Date
Mar 01, 2020
Volume
55
Issue
1
Pages
115–127
Identifiers
DOI: 10.1007/s12601-020-0005-y
Source
Springer Nature
Keywords
License
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Abstract

Ulva are ubiquitous and opportunistic green algae species that easily adapt to various environmental conditions. These algae are responsible for the green tides that cause many environmental and ecological problems in coastal waters. We investigated the physiological responses of Ulva australis under warming, acidification, and eutrophication conditions. The physiological changes in the algae were observed under various combinations of temperature, pH, and NH4+ levels. Combinations of three temperatures (10°C, 20°C, and 30°C), two pH levels (7.80 and 8.20), and two NH4+ concentrations (4 μM and 120 μM) were considered under laboratory conditions. Temperature, NH4+, and pH had significant impact on the photosynthetic and nutrient uptake rates. However, the 12 h observation could not stimulate the seaweed to change the pH in the cultured media. Changes in relative growth rates, photosynthetic efficiency, and variations in tissue C and N were not affected by the interactions between temperature, pH level, and nutrient concentration. It is probable that, due to global warming, the bloom of Ulva australis may continue in warm, acidic, coastal waters with high nutrient levels.

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