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Physiological differences between free-floating and periphytic filamentous algae, and specific submerged macrophytes induce proliferation of filamentous algae: A novel implication for lake restoration.
Chemosphere ( IF 8.1 ) Pub Date : 2019-08-28 , DOI: 10.1016/j.chemosphere.2019.124702 Weizhen Zhang 1 , Hong Shen 2 , Jia Zhang 1 , Jia Yu 3 , Ping Xie 2 , Jun Chen 2
Chemosphere ( IF 8.1 ) Pub Date : 2019-08-28 , DOI: 10.1016/j.chemosphere.2019.124702 Weizhen Zhang 1 , Hong Shen 2 , Jia Zhang 1 , Jia Yu 3 , Ping Xie 2 , Jun Chen 2
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Restoration of submerged macrophytes is widely applied to counteract eutrophication in shallow lakes. However, proliferation and accumulation of filamentous algae (possessing free-floating and periphytic life forms) hamper growth of submerged macrophytes. Here, we explored factors triggering the excessive proliferation of filamentous algae during lake restoration using field investigations and laboratory experiments. Results showed that, compared with free-floating Oscillatoria sp. (FO), periphytic Oscillatoria sp. (PO) showed faster growth rate, greater photosynthetic capacities and higher phosphorus (P) affinity. Therefore, PO was physiologically competitively superior to FO under low P concentration and improved light conditions. And proliferation of filamentous algae was mainly manifested in periphytic life form. Besides, field results showed that density of filamentous algae in water column might be related to substrate types. Some macrophyte (Ceratophyllum oryzetorum and Potamogeton crispus) might provide proper substrates for proliferation of filamentous algae. Further physiological experiments found that Oscillatoria showed specific eco-physiological responses to different macrophyte species. Hydrilla verticillata and C. oryzetorum promoted growth and photosynthetic activity of Oscillatoria, while Potamogeton malaianus inhibited growth and P uptake of PO. Myriophyllum spicatum exhibited no impact on growth of Oscillatoria. Our results revealed the intrinsic (physiological differences between free-floating and periphytic life forms of filamentous algae) and extrinsic (different macrophytes) factors affect the proliferation of filamentous algae, which are important for guidance on planting of submerged macrophytes during lake restoration.
中文翻译：
自由漂浮的和周生的丝状藻类与特定的淹没大型植物之间的生理差异会诱导丝状藻类的增殖：这对湖泊恢复具有新的意义。
沉水植物的恢复被广泛应用于抵消浅水湖泊的富营养化。但是，丝状藻类的增殖和积累（具有自由漂浮和周围生植物的生命形式）阻碍了被淹没的大型植物的生长。在这里，我们通过田野调查和实验室实验探索了在湖泊恢复过程中触发丝状藻类过度繁殖的因素。结果表明，与自由浮动的Oscillatoria sp。相比。（FO），附生的Oscillatoria sp。（PO）表现出更快的生长速度，更大的光合作用能力和更高的磷（P）亲和力。因此，在低P浓度和改善的光照条件下，PO在生理上竞争性优于FO。丝状藻类的增殖主要表现在周生生物形式中。除了，现场结果表明，水柱中丝状藻类的密度可能与基质类型有关。一些大型植物（Ceratophyllum oryzetorum和Potamogeton crispus）可能为丝状藻类的增殖提供适当的基质。进一步的生理实验发现，颤藻显示出对不同大型植物物种的特定生态生理反应。绿头藻和米曲霉促进了颤藻的生长和光合活性，而毛白菜则抑制了PO的生长和对P的吸收。鼠尾草对颤藻的生长没有影响。我们的研究结果表明，内在因素（丝状藻类的自由漂浮和周生生物形态之间的生理差异）和外在因素（不同的大型植物）会影响丝状藻类的增殖，
更新日期：2019-08-28
中文翻译：
自由漂浮的和周生的丝状藻类与特定的淹没大型植物之间的生理差异会诱导丝状藻类的增殖：这对湖泊恢复具有新的意义。
沉水植物的恢复被广泛应用于抵消浅水湖泊的富营养化。但是，丝状藻类的增殖和积累（具有自由漂浮和周围生植物的生命形式）阻碍了被淹没的大型植物的生长。在这里，我们通过田野调查和实验室实验探索了在湖泊恢复过程中触发丝状藻类过度繁殖的因素。结果表明，与自由浮动的Oscillatoria sp。相比。（FO），附生的Oscillatoria sp。（PO）表现出更快的生长速度，更大的光合作用能力和更高的磷（P）亲和力。因此，在低P浓度和改善的光照条件下，PO在生理上竞争性优于FO。丝状藻类的增殖主要表现在周生生物形式中。除了，现场结果表明，水柱中丝状藻类的密度可能与基质类型有关。一些大型植物（Ceratophyllum oryzetorum和Potamogeton crispus）可能为丝状藻类的增殖提供适当的基质。进一步的生理实验发现，颤藻显示出对不同大型植物物种的特定生态生理反应。绿头藻和米曲霉促进了颤藻的生长和光合活性，而毛白菜则抑制了PO的生长和对P的吸收。鼠尾草对颤藻的生长没有影响。我们的研究结果表明，内在因素（丝状藻类的自由漂浮和周生生物形态之间的生理差异）和外在因素（不同的大型植物）会影响丝状藻类的增殖，
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