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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Succession and toxicity of Microcystis and Anabaena (Dolichospermum) blooms are controlled by nutrient-dependent allelopathic interactions
Harmful Algae, Volume 74, Year 2018
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Description
Microcystis and Anabaena (Dolichospermum) are among the most toxic cyanobacterial genera and often succeed each other during harmful algal blooms. The role allelopathy plays in the succession of these genera is not fully understood. The allelopathic interactions of six strains of Microcystis and Anabaena under different nutrient conditions in co-culture and in culture-filtrate experiments were investigated. Microcystis strains significantly reduced the growth of Anabaena strains in mixed cultures with direct cell-to-cell contact and high nutrient levels. Cell-free filtrate from Microcystis cultures proved equally potent in suppressing the growth of nutrient replete Anabaena cultures while also significantly reducing anatoxin-a production. Allelopathic interactions between Microcystis and Anabaena were, however, partly dependent on ambient nutrient levels. Anabaena dominated under low N conditions and Microcystis dominated under nutrient replete and low P during which allelochemicals caused the complete suppression of nitrogen fixation by Anabaena and stimulated glutathione S-transferase activity. The microcystin content of Microcystis was lowered with decreasing N and the presence of Anabaena decreased it further under low P and high nutrient conditions. Collectively, these results indicate that strong allelopathic interactions between Microcystis and Anabaena are closely intertwined with the availability of nutrients and that allelopathy may contribute to the succession, nitrogen availability, and toxicity of cyanobacterial blooms. © 2018 The Authors
Authors & Co-Authors
Chia, Mathias Ahii
Brazil, Sao Paulo
Universidade de São Paulo
United States, Stony Brook
Stony Brook University
Jankowiak, Jennifer G.
United States, Stony Brook
Stony Brook University
Kramer, Benjamin J.
United States, Stony Brook
Stony Brook University
Zimba, Paul V.
United States, Corpus Christi
Texas a and M University - Corpus Christi
Bittencourt-Oliveira, Maria do Carmo
Brazil, Sao Paulo
Universidade de São Paulo
Gobler, Christopher J.
United States, Stony Brook
Stony Brook University
Statistics
Citations: 98
Authors: 6
Affiliations: 3
Identifiers
Doi:
10.1016/j.hal.2018.03.002
ISSN:
15689883
Research Areas
Environmental