Responses of primary producers in shallow lakes to elevated temperature: a mesocosm experiment during the growing season of Potamogeton crispus
Responses of primary producers in shallow lakes to elevated temperature: a mesocosm experiment during the growing season of Potamogeton crispus
复制标题
浅水湖泊初级生产者对高温的响应：卷叶子菜生长季的中生态实验
DOI：
10.1007/s00027-018-0585-0
复制
发表时间：
2018-10-01
期刊：
影响因子：
2.4
通讯作者：
Li, Wei
中科院分区：
文献类型：
--
作者：
Hao, Beibei;Roejkjaer, Anna Fabrin;Li, Wei
气候变暖可能会影响大型植物-附生植物-浮游植物之间的关系，并改变浅水湖泊的生产者群落结构，因为气温升高会促进浮游植物的优势地位。我们进行了为期 5 个月的实验（从冬季，12 月开始），以阐明三个光养群落（大型植物-卷叶眼子菜、附生植物、浮游植物）的反应及其在富营养化、亚热带条件下对升高温度（4.5°C）的相互作用。附生植物的生物量和组成并未受到温度升高的显着影响，而浮游植物的生物量随着浮游植物组成向叶绿藻和蓝藻的更高优势的转变而增加。气候变暖还降低了苋菜的存活率，加速了苋菜的衰退。在环境温度和加热温度下，实验结束时发生了从以卷曲藻为主的透明状态到以丝状藻为主的透明状态的转变，并且变暖促进了这种转变。因此，我们的结果表明，当沉水植物减少或消失时，丝状藻表现出功能补偿，维持浮游植物的低发育，主要是在高温下。
Climate warming may influence the relationship among macrophyte-periphyton-phytoplankton and change the producer community structure in shallow lakes, as elevated temperature has been suggested to promote the dominance of phytoplankton. We performed a 5-month experiment (starting in winter, December) to elucidate the responses of three phototrophic communities (macrophyte-Potamogeton crispus, periphyton, phytoplankton) and their interactions to elevated temperature (4.5 A degrees C) under eutrophic, subtropical conditions. The biomass and composition of periphyton were not significantly affected by increased temperature, while the biomass of phytoplankton increased with a shift in phytoplankton composition towards higher dominance of chlorophytes and cyanobacteria. Warming also reduced the survival of P. crispus and accelerated the decline of P. crispus. At both ambient and heated temperatures, a shift occurred at the end of the experiment from a clear-state dominated by P. crispus to a clear-state dominated by filamentous algae and warming facilitated this shift. Our results thus indicated that, when submerged macrophytes diminished or disappeared, filamentous algae exhibited functional compensation that maintained low phytoplankton development, primarily at elevated temperatures.