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Variation in assimilation efficiencies of dominant Neocalanus and Eucalanus copepods in the subarctic Pacific : consequences for population structure models

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Title: Variation in assimilation efficiencies of dominant Neocalanus and Eucalanus copepods in the subarctic Pacific : consequences for population structure models
Authors: Abe, Yoshiyuki Browse this author
Natsuike, Masafumi Browse this author
Matsuno, Kohei Browse this author →KAKEN DB
Terui, Takeshi Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Imai, Ichiro Browse this author →KAKEN DB
Keywords: Assimilation efficiency
Copepods
Diatoms
Lagrangian ensemble model
Neocalanus cristatus
Issue Date: Nov-2013
Publisher: Elsevier
Journal Title: Journal of experimental marine biology and ecology
Volume: 449
Start Page: 321
End Page: 329
Publisher DOI: 10.1016/j.jembe.2013.10.023
Abstract: The assimilation efficiency of zooplankton is an essential parameter required to estimate energy transfer to higher trophic levels in marine ecosystems. However, little information is available for large oceanic copepods, especially the Neocalanus and Eucalanus species dominant in the subarctic Pacific. In this study, the assimilation efficiencies of the C5 stages of Neocalanus cristatus, Neocalanus flemingeri and Eucalanus bungii were evaluated using eight phytoplankton species as food. The average assimilation efficiencies of N. cristatus, N. flemingeri and E. bungii ranged between 45 and 66%, 44 and 66% and 34 and 65%, respectively. The assimilation efficiency was highly variable depending on the food phytoplankton species. In all species, the assimilation efficiency showed a significant negative relationship with the ash content of the phytoplankton (r2 = 0.79–0.87, p < 0.001). The assimilation efficiency of large-body sized N. cristatus for large-sized diatoms was higher than for the other copepod species. In population models of N. cristatus, changes in assimilation efficiency affect the growth and survival rates of the population. The Lagrangian ensemble model (LEM) for N. cristatus showed that, for assimilation efficiencies less than 57%, the population could not be maintained. Because variations in assimilation efficiency may have significant effects on the copepod population, their variability should be incorporated into marine ecosystem models in the future.
Type: article (author version)
URI: http://hdl.handle.net/2115/54053
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山口 篤

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