Variations in Copepod Proteome and Respiration Rate in Association with Diel Vertical Migration and Circadian Cycle

The Biological Bulletin
Amy E MaasEmma Timmins-Schiffman

Abstract

The diel vertical migration of zooplankton is a process during which individuals spend the night in surface waters and retreat to depth during the daytime, with substantial implications for carbon transport and the ecology of midwater ecosystems. The physiological consequences of this daily pattern have, however, been poorly studied beyond investigations of speed and the energetic cost of swimming. Many other processes are likely influenced, such as fuel use, energetic trade-offs, underlying diel (circadian) rhythms, and antioxidant responses. Using a new reference transcriptome, proteomic analyses were applied to compare the physiological state of a migratory copepod, Pleuromamma xiphias, immediately after arriving to the surface at night and six hours later. Oxygen consumption was monitored semi-continuously to explore underlying cyclical patterns in metabolic rate under dark-dark conditions. The proteomic analysis suggests a distinct shift in physiology that reflects migratory exertion and changes in metabolism. These proteomic analyses are supported by the respiration experiments, which show an underlying cycle in metabolic rate, with a peak at dawn. This project generates molecular tools (transcriptome and proteome) that w...Continue Reading

Citations

Mar 29, 2019·Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics·Ann M TarrantBenni Winding Hansen
May 5, 2021·Biological Reviews of the Cambridge Philosophical Society·Kanchana BandaraKetil Eiane
Jul 28, 2021·Annual Review of Marine Science·Mark W Denny, W Wesley Dowd

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