Metabolism and elemental composition of the euphausiids Euphausia pacifica and Thysanoessa inspinata during the phytoplankton bloom season in the Oyashio region, western subarctic Pacific Ocean
SCIE
SCOPUS
Cited 11 time in
WEB OF SCIENCE
Cited 10 time in
Scopus
-
Title
- Metabolism and elemental composition of the euphausiids Euphausia pacifica and Thysanoessa inspinata during the phytoplankton bloom season in the Oyashio region, western subarctic Pacific Ocean
-
Author(s)
- Kim, Hye Seon; Yamaguchi, Atsushi; Ikeda, Tsutomu
-
Alternative Author(s)
- 김혜선
-
Publication Year
- 2010-09
-
Abstract
- Rates of oxygen consumption (R: mu l O(2) [individual](-1) h(-1)), and ammonia excretion (E: mu g NH(4)-N [individual](-1) h(-1)), O:N ratios (by atoms) and body water contents (% of wet mass [WM], as an index of lipid accumulation) of Euphausia pacifica and Thysanoessa inspinata were monitored during 9-14 March and 6-30 April 2007, including the onset of the spring phytoplankton bloom in the Oyashio region. Regression analyses revealed that variations in R and E were generally correlated with dry body mass (DM) for both euphausiids. When R and E were standardized to a body size of 10 mg DM, R(std), E(std), O:N ratios and water contents fluctuated from 6.3 to 10.1, 0.07 to 0.34, 31 to 232 and 73.8 to 78.1, respectively, for E. pacifica, and from 8.7 to 11.3, 0.06 to 0.71, 24 to 295 and 75.1 to 82.2, respectively, for T. inspinata. None of these variables were significantly correlated with temporal variations in SST (1.7 to 5.7 degrees C) or chlorophyll a standing stock (29.4 to 252.6 mg m(-2), 0-100 m) at the study site. However, April E and O:N ratio data pooled for both euphausiids were significantly less and greater, respectively, than the pooled values in March, suggesting preferential utilization of dietary protein for body growth or reproduction under conditions of abundant food supply as found in April. No substantial differences were observed in water content, ash, C, N or C:N ratios (by mass) of the two euphausiids collected in either March or April. Water content, C, N, C:N ratio and ash data averaged for E. pacifica and T. inspinata over the March and April cruises were similar: 76.3 and 78.1% of WM, 36.1 and 37.5% of DW, 9.4 and 10.1% of DW, 3.82 and 3.71 by mass, and 10.6 and 10.8% of DM, respectively. Combining the R-DM and E-DM relationships established with the population structure data of Kim et al. (2010), we estimate that daily ingestion and ammonia-N regeneration by the combined populations of the two euphausiids were 1.5-24.1% (integrated mean: 4.9%) and 0.18-1.32% (0.41%), respectively, of primary production and associated N demand during the bloom. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
-
ISSN
- 0967-0645
-
URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/4039
-
DOI
- 10.1016/j.dsr2.2010.03.017
-
Bibliographic Citation
- DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, v.57, no.17-18, pp.1733 - 1741, 2010
-
Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
-
Subject
- AMMONIA EXCRETION; CHEMICAL-COMPOSITION; PLANKTON DYNAMICS; BODY-COMPOSITION; SPRING-BLOOM; ZOOPLANKTON; RESPIRATION; NITROGEN; KRILL; BIOMASS
-
Keywords
- Metabolism; Body composition; Euphausia pacifica; Thysanoessa inspinata; Phytoplankton bloom
-
Type
- Article
-
Language
- English
-
Document Type
- Article
- Files in This Item:
-
There are no files associated with this item.
Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.