Krill Hotspot Formation and Phenology in the California Current Ecosystem
Krill Hotspot Formation and Phenology in the California Current Ecosystem
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DOI：
10.1029/2020gl088039
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发表时间：
2020-07-16
影响因子：
5.2
通讯作者：
Messie, Monique
中科院分区：
文献类型：
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作者：
Fiechter, Jerome;Santora, Jarrod A.;Messie, Monique
在加州当前的生态系统中，磷虾由于其在食物网中的中心地位以及形成密集聚集的趋势而成为初级生产和较高营养级物种之间的关键纽带。然而，与沿海上升流相关的强烈平流环流可能会使磷虾热点的时间、发生和持续时间与浮游植物生物量和营养源脱钩。物理-生物耦合模型的结果提供了对控制加州洋流生态系统中磷虾热点物候的基本机制及其对沿海上升流强度沿岸变化的敏感性的见解。模拟表明，在季节和年际时间尺度上控制磷虾热点形成、强度和持续性的动力学具有很强的异质性，并且与沿岸有利上升风、初级生产和洋流的变化有关。此外，促进磷虾热点持续形成的区域与观察到的顶级捕食者丰度的增加相一致，表明该模型解决了重要的生态系统复杂性和功能。
In the California Current Ecosystem, krill represent a key link between primary production and higher trophic level species owing to their central position in the food web and tendency to form dense aggregations. However, the strongly advective circulation associated with coastal upwelling may decouple the timing, occurrence, and persistence of krill hotspots from phytoplankton biomass and nutrient sources. Results from a coupled physical-biological model provide insights into fundamental mechanisms controlling the phenology of krill hotspots in the California Current Ecosystem, and their sensitivity to alongshore changes in coastal upwelling intensity. The simulation indicates that dynamics controlling krill hotspot formation, intensity, and persistence on seasonal and interannual timescales are strongly heterogeneous and related to alongshore variations in upwelling-favorable winds, primary production, and ocean currents. Furthermore, regions promoting persistent krill hotspot formation coincide with increased observed abundance of top predators, indicating that the model resolves important ecosystem complexity and function.