Copepod feeding strategy determines response to seawater viscosity: videography study of two calanoid copepod species
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KeywordCopepods; Zooplankton; Seawater viscosity; Feeding mechanism; Micro-particle tracking velocimetry (µPTV)
Calanoid copepods, depending on feeding strategy, have different behavioral and biological controls on their movements, thereby responding differently to environmental conditions such as changes in seawater viscosity. To understand how copepod responses to environmental conditions are mediated through physical, physiological, and/or behavioral pathways, we used high-speed microvideography to compare two copepod species, Acartia hudsonica and Parvocalanus crassirostris, under different temperature, viscosity, and dietary conditions. Acartia hudsonica exhibited “sink and wait” feeding behavior and typically responded to changes in seawater viscosity; increased seawater viscosity reduced particle-capture behavior and decreased the size of the feeding current. In contrast, P. crassirostris continuously swam and did not show any behavioral or physical responses to changes in viscosity. Both species showed a physiological response to temperature, with reduced appendage beating frequency at cold temperatures, but this did not generally translate into effects on swimming speed, feeding flux, or active time. Both copepod species swam slower when feeding on diatom rather than dinoflagellate prey, showing that prey type mediates copepod behavior. These results differentiate species-specific behaviors and responses to environmental conditions, which may lead to better understanding of niche separation and latitudinal patterns in copepod feeding and movement strategies.
Author Posting. © Company of Biologists, 2020. This article is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology (2020): jeb.220830, doi: 10.1242/jeb.220830.
The publisher requires that this item be embargoed until 2021-06-11. Please check back after 2021-06-11.
Suggested CitationTyrell, A. S., Jiang, H., & Fisher, N. S. (2020). Copepod feeding strategy determines response to seawater viscosity: videography study of two calanoid copepod species. Journal of Experimental Biology, jeb.220830.
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