Differences in physiology explain succession of mixoplankton functional types and affect carbon fluxes in temperate seas
Differences in physiology explain succession of mixoplankton functional types and affect carbon fluxes in temperate seas
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DOI：
10.1016/j.pocean.2020.102481
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发表时间：
2021-01-01
影响因子：
4.1
通讯作者：
Mitra, Aditee
中科院分区：
文献类型：
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作者：
Leles, Suzana Gonsalves;Bruggeman, Jorn;Mitra, Aditee
人们提出了不同的假设来解释浮游生物群落的聚集以及生物多样性的变化如何影响生态系统的功能。混合浮游生物是浮游生物的重要成员，但科学界对它们在浮游生物演替中的作用缺乏明确的认识。在这里，我们使用的建模方法来评估季节性的浮游混合生物功能类型（MFTs）和测试的假设，功能差异影响他们的角色，在关键的碳通量。根据细胞大小以及混合浮游生物是否拥有自己的或获得的光系统，对功能差异进行了建模。生态系统模拟纳入现实的环境变化和验证对9年的长期时间序列的营养物质，叶绿素a，和浮游生物数据从沿海温带海洋。模拟，与经验数据相一致，表明不同大小的混合浮游生物存在于整个水柱，并随着时间的推移，不同的MFTs之间的季节性种群动态不同。重要的是，生产不同大小的类之间的分区取决于如何mixoplankton功能多样性的模型中描述的，并合并mixoplankton到一个功能类型可以掩盖其不同的生态作用，在碳循环。因此，混合浮游生物在构建浮游生物群落及其动态模拟中发挥着重要作用。
Different hypotheses have been proposed explaining plankton community assembly and how changes in biodiversity can impact ecosystem function. Mixoplankton (photo-phago-trophs) are important members of the plankton, but science lacks a clear understanding of their role in plankton succession. Here, we used a modelling approach to evaluate the seasonalities of mixoplankton functional types (MFTs) and to test the hypothesis that functional differences affect their roles in key carbon fluxes. Functional differences were modelled based on cell size and whether mixoplankton possess their own, or acquire, photosystems. Ecosystem simulations incorporated realistic environmental variability and were validated against a 9 yr long-term time series of nutrients, chlorophyll-a, and plankton data from a coastal temperate sea. Simulations, consistent with empirical data, show that mixoplankton of different sizes are present throughout the water column and over time, with seasonal population dynamics differing among the different MFTs. Importantly, the partitioning of production among different size-classes depends on how mixoplankton functional diversity is described in the model, and that merging mixoplankton into one functional type can mask their diverse ecological roles in carbon cycling. Mixoplankton thus play an important role in structuring the plankton community and its dynamics in the simulations.