Ontogenetic vertical migration of the mesopelagic carnivorous copepod Paraeuchaeta spp. is related to their increase in body mass

Abstract Two dominant mesopelagic carnivorous Paraeuchaeta copepods, Paraeuchaeta glacialis in the western Arctic Ocean and Paraeuchaeta elongata in the western subarctic Pacific, exhibited specialized ontogenetic vertical migration patterns with deeper occurrences of early copepodids (C1) and adult...

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Bibliographic Details
Published in:Journal of Plankton Research
Main Authors: Yamaguchi, Atsushi, Ashjian, Carin J, Campbell, Robert G, Abe, Yoshiyuki
Other Authors: US National Science Foundation, Grant-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Arctic Challenge for Sustainability
Format: Article in Journal/Newspaper
Language:English
Published: Oxford University Press (OUP) 2019
Subjects:
Ecology
Aquatic Science
Ecology, Evolution, Behavior and Systematics
Arctic
Arctic Ocean
Pacific
Subarctic
Copepods
Online Access:http://dx.doi.org/10.1093/plankt/fbz051
http://academic.oup.com/plankt/article-pdf/41/5/791/31061726/fbz051.pdf
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Summary:Abstract Two dominant mesopelagic carnivorous Paraeuchaeta copepods, Paraeuchaeta glacialis in the western Arctic Ocean and Paraeuchaeta elongata in the western subarctic Pacific, exhibited specialized ontogenetic vertical migration patterns with deeper occurrences of early copepodids (C1) and adults (C6F/M) and shallower occurrences of older copepodids C3−C5. Molt increments in body masses (wet, dry and ash-free dry masses) exhibited highly significant negative correlations with habitat depth. These facts suggest that both Paraeuchaeta species spend their reproductive (C6F/M) and early developmental (C1) stages in deeper layers to avoid predation and migrate upwards to where prey is abundant during the middle-late copepodid stages (C3−C5) to achieve greater mass growth.

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