Evaluating the relevance of species sorting and physiological plasticity of phytoplankton communities grown in a multifactor environment
Evaluating the relevance of species sorting and physiological plasticity of phytoplankton communities grown in a multifactor environment
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评估多因素环境中生长的浮游植物群落的物种分类和生理可塑性的相关性
DOI：
10.1111/fwb.13810
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发表时间：
--
影响因子：
2.7
通讯作者：
A. Wacker
中科院分区：
文献类型：
--
作者：
Marzetz;A. Wacker
影响浮游植物群落对其环境中非生物因素变化的反应的两个重要机制很难区分：种间竞争压力变化引起的物种分选和表型可塑性（这里明确的生理可塑性，即物种特异性的生理调整）。物种组成的变化以及物种的生理调整可能会导致脂肪酸组成的变化，从而决定浮游动物消费者的食物质量。我们使用由五个物种组成的浮游植物群落，并将它们暴露于两种不同的光照强度、两种光照条件（恒定和可变）和两种磷供应水平。分析了脂肪酸和物种组成的变化。我们通过计算两个变量组成的布雷-柯蒂斯相似指数来比较在一个因素上存在差异的社区对。通过比较物种组成的Bray-Curtis相似指数和脂肪酸组成指数来估计物种分选和生理可塑性的影响。营养供应的变化对基于物种分选和生理可塑性的脂肪酸反应影响最大。一方面，在不同营养供应但相同光环境下的培养中，生理可塑性的相关性最高。相反，在低营养物质的情况下，物种分类似乎主导了对光变化的反应，而在高营养物质的情况下，生理可塑性似乎影响了反应。总体而言，在低磷供应下，群落表现出每个碳的总脂肪酸含量较低，并且饱和和单不饱和脂肪酸的比例增加。相反，弱光下的群落产生了更多的二十碳五烯酸。我们的结果表明，物种分类和生理可塑性在塑造群落反应方面的相关性很大程度上取决于影响系统的环境因素。养分供应的影响最大，而光照的条件影响则更为有限。然而，所有这些因素对于塑造浮游植物群落的食物质量以获得更高的营养水平都很重要。
The two important mechanisms influencing the response of phytoplankton communities to alterations of abiotic factors in their environment are difficult to distinguish: species sorting resulting from a change in interspecific competitive pressure, and phenotypic plasticity (here explicitly physiological plasticity i.e. species‐specific physiological adjustment). A shift in species composition as well as physiological adjustments in species can lead to changes in fatty acid composition that determine the food quality for zooplankton consumers.We used phytoplankton communities consisting of five species and exposed them to two different light intensities, two light conditions (constant and variable), and two levels of phosphorus supply. Changes in fatty acid and species composition were analyzed. We compared community pairs differing in one factor by calculating the Bray‐Curtis similarity index for the composition of both variables. Comparing the Bray‐Curtis similarity index of the species composition with the index of the fatty acid composition was used to estimate the effects of species sorting and physiological plasticity.Changes in nutrient supply influenced fatty acid responses based on species sorting and physiological plasticity the most. On one hand, the relevance of physiological plasticity was highest at cultivation in different nutrient supplies but the same light environment. Conversely with low nutrients species sorting appeared to dominate the response to changes in light, while at high nutrients physiological plasticity appeared to influence the response. Overall, under low phosphorus supply the communities showed a lower total fatty acid content per carbon and had increased proportions of saturated and monounsaturated fatty acids. Instead, communities in low light produced more of eicosapentaenoic acid.Our results suggest that the relevance of species sorting and physiological plasticity in shaping the community response highly depends on the environmental factors that influence the system. Nutrient supply had the largest effect, while light had more limited conditional effects. However, all of these factors are important in shaping the food quality of the phytoplankton community for higher trophic levels.
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影响因子：
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作者：
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