ORCID

Abstract

The impact of selective predation of weaker individuals on the general health of prey populations is well-established in animal ecology. Analogous processes have not been considered at microbial scales despite the ubiquity of microbe-microbe interactions, such as parasitism. Here we present insights into the biotic interactions between a widespread marine thraustochytrid and a diatom from the ecologically important genus Chaetoceros. Physiological experiments show the thraustochytrid targets senescent diatom cells in a similar way to selective animal predation on weaker prey individuals. This physiology-selective targeting of ‘unhealthy’ cells appears to improve the overall health (i.e., increased photosynthetic quantum yield) of the diatom population without impacting density, providing support for ‘healthy herd’ dynamics in a protist–protist interaction, a phenomenon typically associated with animal predators and their prey. Thus, our study suggests caution against the assumption that protist–protist parasitism is always detrimental to the host population and highlights the complexity of microbial interactions.

Publication Date

2021-07-01

Publication Title

The ISME Journal

Volume

15

Issue

7

ISSN

1751-7362

Acceptance Date

2021-02-10

Deposit Date

2022-08-02

Embargo Period

2022-02-10

Keywords

Parasitism, diatom, thraustochytrid, protist, phytoplankton, biotic interactions

First Page

2163

Last Page

2166

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