Allelopathic effects of Microcystis aeruginosa on green algae and a diatom: Evidence from exudates addition and co-culturing

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• 作者：Longchang Wang^a ; ¹ ; Jinmei Zi^a ; ¹ ; Runbing Xu^a ; Sabine Hilt^b ; ^{hilt@igb-berlin.de} ; Xiuli Hou^c ; Xuexiu Chang^a ; ^{changxx@ynu.edu.cn}
• 关键词：Allelopathy ; Cyanobacteria ; Eutrophication ; Phytoplankton competition
• 刊名：Harmful Algae
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：61
• 期：Complete
• 页码：56-62
• 全文大小：932 K
• 卷排序：61

文摘

Allelopathic interactions among phytoplankton species are regarded as one of the important factors contributing to phytoplankton species competition and succession. The role and extent of allelopathic effects of blooming freshwater cyanobacteria on other phytoplankton species in eutrophied waters, however, are still unknown. We examined the allelopathic effect of Microcystis aeruginosa on two common green algae (Scenedesmus quadricauda, Chlorella pyrenoidosa) and a diatom (Cyclotella meneghiniana) by adding exudates from different growth phases and in co-culture tests. Exudates of M. aeruginosa from the exponential growth phase and the stationary phase significantly inhibited the growth of S. quadricauda, C. pyrenoidosa and C. meneghiniana, whereas those from the decline phase increased their growth. The presence of M. aeruginosa extremely inhibited the growth of all tested species in co-cultures within 24 h. Our results indicate that under the tested environmental conditions (25 °C, light 80 μmol quanta m−2 s−1, manual shaking twice a day), allelopathic effects of M. aeruginosa on other phytoplankton species can significantly contribute to their competitive success.