Interactive effects of nutrients and temperature on herbivorous predation in a coastal plankton community
Interactive effects of nutrients and temperature on herbivorous predation in a coastal plankton community
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DOI：
10.1002/lno.12289
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发表时间：
2022-12
影响因子：
4.5
通讯作者：
Gayantonia Franzè;S. Anderson;Joshua D. Kling;P. Wilburn;D. Hutchins;E. Litchman;T. Rynearson;S. Menden‐Deuer
中科院分区：
文献类型：
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作者：
Gayantonia Franzè;S. Anderson;Joshua D. Kling;P. Wilburn;D. Hutchins;E. Litchman;T. Rynearson;S. Menden‐Deuer
沿海环境中的海洋微生物群落受到季节性波动和人为环境条件改变的影响。温度和资源依赖性对浮游植物生长、群落和生态系统代谢的单独影响相对较好地理解。然而，海洋中的赢家和输家取决于往往迅速变化的生物、化学和物理驱动因素之间的相互作用。直接，间接，和交互作用的影响，这些条件对营养食物网的结构和功能的制约很差。在这里，我们调查了如何同时操纵温度和营养物质的可用性影响营养转移从浮游植物到草食性原生生物，以及它们在生态系统水平上产生的影响。温度直接影响草食性原生生物组成;纤毛虫占主导地位（66%）在较冷的治疗和甲藻（60%）在温暖的温度。在整个实验中，放牧率< 0.1 d-1，在零度以下的温度下更高。总的来说，营养盐-温度的相互作用影响营养转移率拮抗时，营养物质进行修改，协同作用，当营养物质不添加。这种相互作用导致了较高的百分比的初级生产消耗下营养素未修正相比，营养素修正的条件。在生态系统一级，这些变化可能决定初级生产的命运，在高温和营养条件下，大部分生产可能会输出到远洋区，而高温和低营养的可用性加强了食物网耦合，增强了营养转移。这些结果意味着，在变暖的海洋，沿海营养负荷的管理将是一个关键的决定因素的程度，初级生产去除微型浮游动物和依赖生态系统的生产。
Marine microbial communities in coastal environments are subject to both seasonal fluctuations and anthropogenic alterations of environmental conditions. The separate influences of temperature and resource‐dependency on phytoplankton growth, community, and ecosystem metabolism are relatively well understood. However, winners and losers in the ocean are determined based on the interplay among often rapidly changing biological, chemical and physical drivers. The direct, indirect, and interactive effects of these conditions on planktonic food web structure and function are poorly constrained. Here, we investigated how simultaneous manipulation of temperature and nutrient availability affects trophic transfer from phytoplankton to herbivorous protists, and their resulting implications at the ecosystem level. Temperature directly affected herbivorous protist composition; ciliates dominated (66%) in colder treatment and dinoflagellates (60%) at warmer temperatures. Throughout the experiments, grazing rates were < 0.1 d−1, with higher rates at subzero temperatures. Overall, the nutrient–temperature interplay affected trophic transfer rates antagonistically when nutrients were amended, and synergistically, when nutrients were not added. This interaction resulted in higher percentages of primary production consumed under nutrient unamended compared to nutrient amended conditions. At the ecosystem level, these changes may determine the fate of primary production, with most of the production likely exported out of the pelagic zone in high‐temperature and nutrient conditions, while high‐temperature and low‐nutrient availability strengthened food web coupling and enhanced trophic transfer. These results imply that in warming oceans, management of coastal nutrient loading will be a critical determinant of the degree of primary production removal by microzooplankton and dependent ecosystem production.