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

Abe Yoshiyuki; Natsuike Masafumi; Matsuno Kohei; Terui Takeshi; Yamaguchi Atsushi; Imai Ichiro

Title	en Variation in assimilation efficiencies of dominant Neocalanus and Eucalanus copepods in the subarctic Pacific : consequences for population structure models
Creator	en Abe, Yoshiyuki en Natsuike, Masafumi en Matsuno, Kohei NRID 1000090712159 en Terui, Takeshi en Yamaguchi, Atsushi NRID 1000050344495 en Imai, Ichiro NRID 1000080271013
Accessrights	open access
Subject	Other en Assimilation efficiency Other en Copepods Other en Diatoms Other en Lagrangian ensemble model Other en Neocalanus cristatus NDC 468
Description	Abstract en 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.
Publisher	en Elsevier
Date	Issued2013-11
Language	eng
Resource Type	journal article
Version Type	AM
Identifier	HDL http://hdl.handle.net/2115/54053
Relation	isVersionOf DOI https://doi.org/10.1016/j.jembe.2013.10.023
Journal	PISSN 0022-0981 NCID AA00697537 en Journal of experimental marine biology and ecology Volume Number449 Page Start321 Page End329
File	fulltext Abe-et-al.pdf 694.1 KB (application/pdf) Issued2013-11
Oaidate	2023-07-26