Journal
JOURNAL OF PLANKTON RESEARCH
Volume 45, Issue 4, Pages 576-596Publisher
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbad020
Keywords
mixoplankton; mixotrophy; evolution; trade-offs; biogeography; food-webs; methods
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Phago-mixotrophy, the combination of photoautotrophy and phagotrophy, is gaining attention in the study of mixoplankton. Many protistan plankton species engage in phago-mixotrophy to obtain nutrients, but our understanding of mixoplankton lags behind zooplankton and phytoplankton. Five research directions are proposed to advance the field: evolution, traits and trade-offs, biogeography, biogeochemistry and trophic transfer, and in situ methods.
Phago-mixotrophy, the combination of photoautotrophy and phagotrophy in mixoplankton, organisms that can combine both trophic strategies, have gained increasing attention over the past decade. It is now recognized that a substantial number of protistan plankton species engage in phago-mixotrophy to obtain nutrients for growth and reproduction under a range of environmental conditions. Unfortunately, our current understanding of mixoplankton in aquatic systems significantly lags behind our understanding of zooplankton and phytoplankton, limiting our ability to fully comprehend the role of mixoplankton (and phago-mixotrophy) in the plankton food web and biogeochemical cycling. Here, we put forward five research directions that we believe will lead to major advancement in the field: (i) evolution: understanding mixotrophy in the context of the evolutionary transition from phagotrophy to photoautotrophy; (ii) traits and trade-offs: identifying the key traits and trade-offs constraining mixotrophic metabolisms; (iii) biogeography: large-scale patterns of mixoplankton distribution; (iv) biogeochemistry and trophic transfer: understanding mixoplankton as conduits of nutrients and energy; and (v) in situ methods: improving the identification of in situ mixoplankton and their phago-mixotrophic activity.
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