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Spatial heterogeneity and seasonality of phytoplankton responses to marine heatwaves in the Northeast Pacific
Marine heatwaves (MHWs) have emerged as a recurrent phenomenon in the Northeast Pacific (NEP) since 2013, with significant ecological and economic consequences. However, our understanding of the impact of these events on phytoplankton, the primary producers in the marine food web, remains incomplete. In this study, we elucidated the phytoplankton responses during MHWs in the NEP between 1998 and 2022 and revealed contrasting phytoplankton chlorophyll anomalies between the north and south of the Transition Zone Chlorophyll Front (TZCF). Specifically, chlorophyll shows a marked increase north of the TZCF but a decrease south of it, with the most pronounced negative anomalies centered on the TZCF. Additionally, this chlorophyll response exhibits a remarkable seasonality, consistent with the seasonal migration of the TZCF. Weakened subpolar southward Ekman transport, which may have resulted in reduced phytoplankton nutrient supply, is likely to be the major contributor to the negative chlorophyll response in this frontal region. Our results highlight the importance of previously unrecognized spatial and temporal heterogeneity of phytoplankton responses to MHWs in the NEP, which may provide insights for future ecosystem conservation and fisheries management in the NEP under MHWs.
Spatial heterogeneity and seasonality of phytoplankton responses to marine heatwaves in the Northeast Pacific
Marine heatwaves (MHWs) have emerged as a recurrent phenomenon in the Northeast Pacific (NEP) since 2013, with significant ecological and economic consequences. However, our understanding of the impact of these events on phytoplankton, the primary producers in the marine food web, remains incomplete. In this study, we elucidated the phytoplankton responses during MHWs in the NEP between 1998 and 2022 and revealed contrasting phytoplankton chlorophyll anomalies between the north and south of the Transition Zone Chlorophyll Front (TZCF). Specifically, chlorophyll shows a marked increase north of the TZCF but a decrease south of it, with the most pronounced negative anomalies centered on the TZCF. Additionally, this chlorophyll response exhibits a remarkable seasonality, consistent with the seasonal migration of the TZCF. Weakened subpolar southward Ekman transport, which may have resulted in reduced phytoplankton nutrient supply, is likely to be the major contributor to the negative chlorophyll response in this frontal region. Our results highlight the importance of previously unrecognized spatial and temporal heterogeneity of phytoplankton responses to MHWs in the NEP, which may provide insights for future ecosystem conservation and fisheries management in the NEP under MHWs.
Spatial heterogeneity and seasonality of phytoplankton responses to marine heatwaves in the Northeast Pacific
Xinchen Shen (author) / Weikang Zhan (author) / Ying Zhang (author) / Qingyou He (author) / Yingjie Bo (author) / Yunchen Liu (author) / Haigang Zhan (author)
2024
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
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