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Shifting metabolic priorities among key protistan taxa within and below the euphotic zone
Author(s) -
Hu Sarah K.,
Liu Zhenfeng,
Alexander Harriet,
Campbell Victoria,
Connell Paige E.,
Dyhrman Sonya T.,
Heidelberg Karla B.,
Caron David A.
Publication year - 2018
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.14259
Subject(s) - biology , photic zone , trophic level , phototroph , ecology , taxon , key (lock) , phytoplankton , photosynthesis , nutrient , botany
Summary A metatranscriptome study targeting the protistan community was conducted off the coast of Southern California, at the San Pedro Ocean Time‐series station at the surface, 150 m (oxycline), and 890 m to link putative metabolic patterns to distinct protistan lineages. Comparison of relative transcript abundances revealed depth‐related shifts in the nutritional modes of key taxonomic groups. Eukaryotic gene expression in the sunlit surface environment was dominated by phototrophs, such as diatoms and chlorophytes, and high abundances of transcripts associated with synthesis pathways (e.g., photosynthesis, carbon fixation, fatty acid synthesis). Sub‐euphotic depths (150 and 890 m) exhibited strong contributions from dinoflagellates and ciliates, and were characterized by transcripts relating to digestion or intracellular nutrient recycling (e.g., breakdown of fatty acids and V‐type ATPases). These transcriptional patterns underlie the distinct nutritional modes of ecologically important protistan lineages that drive marine food webs, and provide a framework to investigate trophic dynamics across diverse protistan communities.