Abstract：
:Phytoplankton play key roles in the oceans by regulating global biogeochemical cycles and production in marine food webs. Global warming is thought to affect phytoplankton production both directly, by impacting their photosynthetic metabolism, and indirectly by modifying the physical environment in which they grow. In this respect, the Bermuda Atlantic Time-series Study (BATS) in the Sargasso Sea (North Atlantic gyre) provides a unique opportunity to explore effects of warming on phytoplankton production across the vast oligotrophic ocean regions because it is one of the few multidecadal records of measured net primary productivity (NPP). We analysed the time series of phytoplankton primary productivity at BATS site using machine learning techniques (ML) to show that increased water temperature over a 27-year period (1990-2016), and the consequent weakening of vertical mixing in the upper ocean, induced a negative feedback on phytoplankton productivity by reducing the availability of essential resources, nitrogen and light. The unbalanced availability of these resources with warming, coupled with ecological changes at the community level, is expected to intensify the oligotrophic state of open-ocean regions that are far from land-based nutrient sources.
journal_name
Sci Repjournal_title
Scientific reportsauthors
D'Alelio D,Rampone S,Cusano LM,Morfino V,Russo L,Sanseverino N,Cloern JE,Lomas MWdoi
10.1038/s41598-020-59989-ysubject
Has Abstractpub_date
2020-02-25 00:00:00pages
3287issue
1issn
2045-2322pii
10.1038/s41598-020-59989-yjournal_volume
10pub_type
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