Defining planktonic protist functional groups on mechanisms for energy and nutrient acquisition : incorporation of diverse mixotrophic strategies Mitra, Aditee Flynn, Kevin J. Tillmann, Urban Raven, John A. Caron, David A. Stoecker, Diane K. Not, Fabrice Hansen, Per J. Hallegraeff, Gustaaf M. Sanders, Robert W. Wilken, Susanne McManus, George Johnson, Matthew D. Pitta, Paraskevi Våge, Selina Berge, Terje Calbet, Albert Thingstad, Frede Jeong, Hae Jin Burkholder, JoAnn M. Glibert, Patricia M. Graneli, Edna Lundgren, Veronica 2016-03-23T18:32:05Z 2016-03-23T18:32:05Z 2016-01-03
dc.description © The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Protist 167 (2016): 106–120, doi:10.1016/j.protis.2016.01.003. en_US
dc.description.abstract Arranging organisms into functional groups aids ecological research by grouping organisms (irrespective of phylogenetic origin) that interact with environmental factors in similar ways. Planktonic protists traditionally have been split between photoautotrophic “phytoplankton” and phagotrophic “microzooplankton”. However, there is a growing recognition of the importance of mixotrophy in euphotic aquatic systems, where many protists often combine photoautotrophic and phagotrophic modes of nutrition. Such organisms do not align with the traditional dichotomy of phytoplankton and microzooplankton. To reflect this understanding, we propose a new functional grouping of planktonic protists in an eco-physiological context: (i) phagoheterotrophs lacking phototrophic capacity, (ii) photoautotrophs lacking phagotrophic capacity, (iii) constitutive mixotrophs (CMs) as phagotrophs with an inherent capacity for phototrophy, and (iv) non-constitutive mixotrophs (NCMs) that acquire their phototrophic capacity by ingesting specific (SNCM) or general non-specific (GNCM) prey. For the first time, we incorporate these functional groups within a foodweb structure and show, using model outputs, that there is scope for significant changes in trophic dynamics depending on the protist functional type description. Accordingly, to better reflect the role of mixotrophy, we recommend that as important tools for explanatory and predictive research, aquatic food-web and biogeochemical models need to redefine the protist groups within their frameworks. en_US
dc.description.sponsorship This work was funded by grants to KJF and AM from the Leverhulme Trust (International Network Grant F00391 V) and NERC (UK) through its iMARNET programme NE/K001345/1. en_US
dc.identifier.citation Protist 167 (2016): 106–120 en_US
dc.identifier.doi 10.1016/j.protis.2016.01.003
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights Attribution 4.0 International *
dc.subject Plankton functional types (PFTs) en_US
dc.subject Phagotroph en_US
dc.subject Phototroph en_US
dc.subject Mixotroph en_US
dc.subject Phytoplankton en_US
dc.subject Microzooplankton en_US
dc.title Defining planktonic protist functional groups on mechanisms for energy and nutrient acquisition : incorporation of diverse mixotrophic strategies en_US
dc.type Article en_US
dspace.entity.type Publication
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