The interactive effects of temperature and nutrients on a spring phytoplankton community
The interactive effects of temperature and nutrients on a spring phytoplankton community
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DOI：
10.1002/lno.12023
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发表时间：
2022-02-08
影响因子：
4.5
通讯作者：
Rynearson, Tatiana A.
中科院分区：
文献类型：
--
作者：
Anderson, Stephanie, I;Franze, Gayantonia;Rynearson, Tatiana A.
环境变量影响浮游植物群落组成和生理的复杂相互作用。温度和营养物质的有效性是驱动浮游植物生长和组成的两个主要因素，但通常是在实验室对单个物种进行独立调查。为了评估温度和营养物质浓度对浮游植物群落组成和生理的个体和交互影响，我们改变了罗德岛州纳拉甘西特湾一个适应寒冷的春季浮游植物群落的温度和营养条件，当时地表温度为2.6℃，叶绿素>；9微克L-1。水在零下0.5摄氏度、2.6摄氏度和6摄氏度的三份水中孵化10天。在每个温度下，处理包括营养改良剂(添加N、P、Si)和对照(不添加常量营养素)。温度和资源可获得性的交互作用改变了浮游植物的生长和群落结构。养分修正导致物种分类，群落由较大的物种主导。在营养充足的情况下，变暖使浮游植物的生长速度增加了两倍，但在原位营养条件下，温度的升高起到了相反的作用，使生长速度降低了33%，这表明群落变得营养有限。温度-营养物质的相互作用改变了浮游植物群落中每个物种的相对比例，导致在温度下降时更多富含二氧化硅的细胞，而无论营养物质是什么，C：N因资源的可获得性而变化，营养限制导致C：N在温度升高时增加47%。我们的结果说明了温度-营养物质的相互作用如何改变浮游植物群落的动态，温度的变化放大或加剧了营养物质的影响，意味着更高的营养水平和碳通量。
A complex interplay of environmental variables impacts phytoplankton community composition and physiology. Temperature and nutrient availability are two principal factors driving phytoplankton growth and composition, but are often investigated independently and on individual species in the laboratory. To assess the individual and interactive effects of temperature and nutrient concentration on phytoplankton community composition and physiology, we altered both the thermal and nutrient conditions of a cold-adapted spring phytoplankton community in Narragansett Bay, Rhode Island, when surface temperature was 2.6 degrees C and chlorophyll > 9 mu g L-1. Water was incubated in triplicate at -0.5 degrees C, 2.6 degrees C, and 6 degrees C for 10 d. At each temperature, treatments included both nutrient amendments (N, P, Si addition) and controls (no macronutrients added). The interactive effects of temperature and resource availability altered phytoplankton growth and community structure. Nutrient amendments resulted in species sorting and communities dominated by larger species. Under replete nutrients, warming tripled phytoplankton growth rates, but under in situ nutrient conditions, increased temperature acted antagonistically, reducing growth rates by as much as 33%, suggesting communities became nutrient limited. The temperature-nutrient interplay shifted the relative proportions of each species within the phytoplankton community, resulting in more silica rich cells at decreasing temperatures, irrespective of nutrients, and C : N that varied based on resource availability, with nutrient limitation inducing a 47% increase in C : N at increasing temperatures. Our results illustrate how the temperature-nutrient interplay can alter phytoplankton community dynamics, with changes in temperature amplifying or exacerbating the nutrient effect with implications for higher trophic levels and carbon flux.