Significant organic carbon acquisition by Prochlorococcus in the oceans
Significant organic carbon acquisition by Prochlorococcus in the oceans
Abstract Marine phytoplankton are responsible for about half of the photosynthesis on Earth. Many are mixotrophs, combining photosynthesis with heterotrophic assimilation of organic carbon but the relative contribution of these two carbon sources is not well quantified. Here, single-cell measurements reveal that Prochlorococcus at the base of the photic zone in the Eastern Mediterranean Sea are obtaining only ~20% of carbon required for growth by photosynthesis. Consistently, laboratory-calibrated evaluations of Prochlorococcus photosynthesis indicate that carbon fixation is systematically too low to support published in situ growth rates in the deep photic layer of the Pacific Ocean. Furthermore, agent-based model simulations show that mixotrophic cells maintain realistic growth rates and populations 10s of meters deeper than obligate photo-autotrophs, deepening the nutricline and Deep Chlorophyll Maximum by ~20 m. Time-series of Prochlorococcus ecotype-abundance from the subtropical North Atlantic and North Pacific suggest that up to 30% of the Prochlorococcus cells live where light intensity is not enough to sustain obligate photo-autotrophic populations during warm, stratified periods. Together, these data and models suggest that mixotrophy underpins the ecological success of a large fraction of the global Prochlorococcus population and its collective genetic diversity.
Voss Maren、Wu Zhen、Roth-Rosenberg Dalit、Luzzatto-Knaan Tal、Zoccarato Luca、Eigemann Falk、Follows Michael J.、Grossart Hans-Peter、Sher Daniel、Vogts Angela、Weissberg Osnat、Aharonovich Dikla
Leibniz-Institute for Baltic Sea ResearchDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of TechnologyDepartment of Marine Biology, Leon H. Charney School of Marine Sciences, University of HaifaDepartment of Marine Biology, Leon H. Charney School of Marine Sciences, University of HaifaDepartment of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland FisheriesLeibniz-Institute for Baltic Sea ResearchDepartment of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of TechnologyDepartment of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries||Potsdam University, Institute of Biochemistry and BiologyDepartment of Marine Biology, Leon H. Charney School of Marine Sciences, University of HaifaLeibniz-Institute for Baltic Sea ResearchDepartment of Marine Biology, Leon H. Charney School of Marine Sciences, University of HaifaDepartment of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa
海洋学环境科学理论生物科学现状、生物科学发展
Voss Maren,Wu Zhen,Roth-Rosenberg Dalit,Luzzatto-Knaan Tal,Zoccarato Luca,Eigemann Falk,Follows Michael J.,Grossart Hans-Peter,Sher Daniel,Vogts Angela,Weissberg Osnat,Aharonovich Dikla.Significant organic carbon acquisition by Prochlorococcus in the oceans[EB/OL].(2025-03-28)[2025-06-06].https://www.biorxiv.org/content/10.1101/2022.01.14.476346.点此复制
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