Phytoplankton competition and resilience under fluctuating temperature.
Phytoplankton competition and resilience under fluctuating temperature.
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DOI：
10.1002/ece3.9851
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发表时间：
2023-03
影响因子：
2.6
通讯作者：
中科院分区：
文献类型：
--
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环境变异性是自然系统的固有特征，它使物种相互作用的预测变得复杂。首先，预测生物体对环境波动的反应的复杂性部分是因为物种对非生物因素的反应是非线性的，即使在稳定的条件下。温度对浮游植物的生长和生理起着重要的控制作用，但温度波动对生长和竞争动力学的影响在很大程度上是未知的。为了探讨在不同环境中共存的限制，海洋硅藻，三角褐指藻和海链藻的物种丰度比恒定的稳定混合培养物，暴露于不同的温度波动制度（n = 17）在高和低氮（N）条件下。在这里，我们表明，浮游植物表现出很大的弹性温度变化。观察物种丰度比变化所需的时间随着波动的增加而减少，但只有当温度波动幅度很高（±8.2°C）时，高N条件下两种模式物种的共存才会被破坏。氮限制导致物种共存破坏的热振幅变低（±5.9°C）。此外，一旦恢复稳定的条件，这两个物种从温度波动中恢复的能力不同。我们的研究结果表明，尽管预期的波动对不同的竞争对手的不平等的影响，在环境条件下的周期可能会降低物种更替率时，振幅保持在一定的阈值以下。然而，超过这些阈值，竞争性排斥可能会加速，这表明水生热浪和氮的可用性状态可能会导致浮游植物群落组成的突然和不可预测的重组。这个数字是詹森的不平等和规模转换理论的一般表示，这是我们的手稿中探索的基石理论思想。
Environmental variability is an inherent feature of natural systems which complicates predictions of species interactions. Primarily, the complexity in predicting the response of organisms to environmental fluctuations is in part because species' responses to abiotic factors are non‐linear, even in stable conditions. Temperature exerts a major control over phytoplankton growth and physiology, yet the influence of thermal fluctuations on growth and competition dynamics is largely unknown. To investigate the limits of coexistence in variable environments, stable mixed cultures with constant species abundance ratios of the marine diatoms, Phaeodactylum tricornutum and Thalassiosira pseudonana, were exposed to different temperature fluctuation regimes (n = 17) under high and low nitrogen (N) conditions. Here we demonstrate that phytoplankton exhibit substantial resilience to temperature variability. The time required to observe a shift in the species abundance ratio decreased with increasing fluctuations, but coexistence of the two model species under high N conditions was disrupted only when amplitudes of temperature fluctuation were high (±8.2°C). N limitation caused the thermal amplitude for disruption of species coexistence to become lower (±5.9°C). Furthermore, once stable conditions were reinstated, the two species differed in their ability to recover from temperature fluctuations. Our findings suggest that despite the expectation of unequal effect of fluctuations on different competitors, cycles in environmental conditions may reduce the rate of species replacement when amplitudes remain below a certain threshold. Beyond these thresholds, competitive exclusion could, however, be accelerated, suggesting that aquatic heatwaves and N availability status are likely to lead to abrupt and unpredictable restructuring of phytoplankton community composition. This figure is a generic representation of Jensen's inequality and scale transition theory, which are the cornerstone theoretical ideas explored in our manuscript.
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DOI：
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发表时间：
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影响因子：
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