Fottea 2023, 23(2):235-245 | DOI: 10.5507/fot.2023.003

Effects of stressors on growth and competition between different cryptic taxa affiliated with Ochromonadales (Chrysophyceae)

Lisa Boden1*, Guido Sieber1, Jens Boenigk1, 2
1 Department Biodiversity, University of Duisburg-Essen Universitätsstr. 5, 45141 Essen, Germany; *Corresponding author
2 Center for Water and Environmental Research, University of Duisburg-Essen Universitätsstr. 5, 45141 Essen, Germany

Morphologically similar flagellate taxa comprise a high cryptic diversity. This diversity evolved partly through parallel evolution in several phylogenetically distinct taxa. Here we investigate the effects of heat waves and salinization on growth and competition between cryptic taxa. For this purpose, we developed specific FISH probes targeting the phylogenetic clades comprising Pedospumella encystans, Spumella rivalis, and Poteriospumella lacustris, respectively. Exposure to salt resulted in a decreasing growth rate for all three taxa. In contrast, a sudden increase in temperature to 27 °C stimulated particularly the growth of P. lacustris. This species showed a high competitive strength and the taxon-specific responses to stressors lead to a shift of community composition. This turn-over of differently adapted cryptic species with presumably similar feeding preferences and predator-prey interactions may stabilize microbial food webs facing environmental change.

Keywords: anthropogenic stressors, Chrysophyceae, cryptic species, fluorescence in situ hybridization, heat wave, heterotrophic flagellate, microbial food web, multiple stressors, salinization

Received: October 14, 2022; Revised: January 10, 2023; Accepted: January 20, 2023; Prepublished online: August 2, 2023; Published: October 25, 2023  Show citation

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Boden, L., Sieber, G., & Boenigk, J. (2023). Effects of stressors on growth and competition between different cryptic taxa affiliated with Ochromonadales (Chrysophyceae). Fottea, 23(2), 235-245. doi: 10.5507/fot.2023.003
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