open access

https://hdl.handle.net/2115/85270

An approach to integrating specific dynamic action (SDA) with routine metabolism for improved estimation of the realistic metabolism of marine metazooplankton in the field

英語

metazooplankton

2021-05

Springer

Marine Biology

168(5)

65

An increase in respiration (RSDA) associated with food ingestion (I) was estimated from routine rates (Rroutine) determined in the absence of food with sealed-chamber methods. Based on regression analyses of RSDA on I for metazooplankton in the laboratory, the fraction of I allocated to RSDA was calculated to be 0.10. Likely food ingestion of metazooplankton in the field (Ifield) was derived from “basic balanced equations” in which parameters such as Rroutine, laboratory-obtained food absorption efficiency (AE) and gross growth efficiency (K1) were incorporated (I&M model). Based on differences in AE values, metazooplankton were separated into particle-feeders (herbivores, omnivores) and carnivores and RSDA was computed to be 0.37 times Rroutine for the former and 0.25 times Rroutine for the latter. Hence, realistic respiration rates of metazooplankton feeding in the field (Rfield = RSDA + Rroutine) accounted for 1.37 times Rroutine for particle-feeders and 1.25 times Rroutine for carnivores. The increase in ammonia excretion (ESDA) accompanied by SDA in particle-feeders and carnivores was calculated from RSDA coupled with carbon-to-nitrogen (C:N by mass) ratios of possible natural foods (6.5 for the former and 4.5 for the latter). Results indicated that ESDA is 0.080 times RSDA for particle-feeders, and 0.116 times RSDA for carnivores.

学術雑誌論文

Accepted Manuscript

This is a post-peer-review, pre-copyedit version of an article published in Marine Biology. The final authenticated version is available online at: http://doi.org/10.1007/s00227-021-03857-4

0025-3162

1432-1793

AA00721369