The Impact of Temperature on Benthic Algal Communities
As global climate change intensifies,the impact of temperature on biological communities cannot be overlooked.Therefore,we conducted a series of algal community control experiments,with temperature as the sole variable,across a six-group temperature gradient ranging from 5℃ to 30℃.To investigate the effects of temperature changes on communities,we employed analysis of variance(ANOVA)and non-metric multidimensional scaling(NMDS)to compare the differences in algal growth rate,Shannon diversity index,Shannon entropy index,Pielou evenness,and community structure among different temperature groups.The results indicated the following:(1)There was a significant difference in the species composition of algal communities between different temperature treatment groups(stress value=0.12),with green algae preferring temperatures between 10 and 20℃,diatoms preferring temperatures between 5 and 15° C,and blue-green algae preferring temperatures between 20 and 30℃.(2)At lower temperatures(5,10,15 ℃),the Surirella becomes the main dominant species;at higher temperatures(15,20,and 30 ℃),Surirella and Scenedesmus jointly dominate.(2)At lower temperatures(5,10,15 ℃),Surirella became the predominant species;at higher temperatures(15,20,and 30℃),Surirella and Scenedesmus jointly dominated.(3)At 30 ℃,the community richness exhibited a maximum value of 0.8720.(4)The growth rate of algal communities showed significant differences at different temperatures(P＜0.05).Diatoms favored low-temperature environments,while Cyanobacteria and Chlorophyta favored higher-temperature environments.(4)After five days of constant temperature incubation,there were significant differences in diversity indices among the temperature groups(P＜0.05),with the highest Shannon's diversity index and Shannon's entropy index observed in the 30℃ group,and the highest Pielou's evenness in the 10℃ group.This study not only elucidates the effects of temperature on benthic algal communities but also provides a theoretical foundation for the cultivation of algae,fertilization,aquaculture,and the protection and management of aquatic ecosystems.
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