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Title
  • en Metabolism of mesopelagic and bathypelagic copepods in the western North Pacific Ocean
Creator
Accessrights open access
Subject
  • Other en Mesopelagic
  • Other en Bathypelagic
  • Other en Copepods
  • Other en Respiration
  • Other en ETS activity
  • Other en Western North Pacific
  • NDC 660
Description
  • Abstract en Respiration (= oxygen consumption) rates and electron transport system (ETS) enzyme activities in conjunction with body carbon and nitrogen composition (for respiration) or protein (for ETS) were determined for over 50 copepod species from the mesopelagic (M; 500 to 1000 m), upperbathypelagic (UB; 1000 to 2000 m) and lower-bathypelagic (LB; 2000 to 3000 m) zones of the western subarctic Pacific. Calculated specific respiration rates (SR, a fraction of body carbon respired) at in situ temperatures (3, 2 and 1.5°C for the M, UB and LB zones, respectively) were greater for the M zone copepods (mean: 1.1% body C d–1) than that for the UB and LB zone copepods (both 0.6% body C d–1). Respiration rates adjusted to those at 1°C by using a Q10 value (2.0), and to those of specimens with 1 mg body nitrogen by using a body mass exponent (0.8) (e.g. adjusted metabolic rates, AMR, in μl O2 (mg body N)–0.8 h–1) were also greater for the M zone copepods than for the UB and LB zone copepods. ETS activities, measured as μl O2 (mg protein)–0.8 h–1, showed the same depth-related decline from the M zone to the LB zone. Stepwise regression analysis revealed that stage/sex, feeding type and/or reaction speeds (as judged by the presence/absence of myelin sheath enveloping axons) of copepods were possible additional variables affecting their respiration rates and ETS activities. The reduction in respiration rates and ETS activities from the M zone to the UB or LB zone is more pronounced when respiration rate data on Arctic/Antarctic epipelagic copepods is added; the same is true for ETS activities when respiration rate data is added from copepods dominant in the subarctic Pacific. The present results are compared with those of micronektonic crustaceans and fishes reported for specimens collected from 500 to 2000 m in other regions and discussed in the light of the ‘visual interactions’ hypothesis.
Publisher en Inter-Research
Date
    Issued2006-09-20
Language
  • eng
Resource Type journal article
Version Type VoR
Identifier HDL http://hdl.handle.net/2115/56878
Relation
  • isIdenticalTo DOI https://doi.org/10.3354/meps322199
Journal
    • PISSN 0171-8630
    • EISSN 1616-1599
    • NCID AA10608952
      • en Marine Ecology Progress Series
      • Volume Number322 Page Start199 Page End211
File
Oaidate 2023-07-26