Auel, H, Hagen, W, Ekau, Werner ORCID: and Verheye, HM (2005) Metabolic adaptations and reduced respiration of the copepodCalanoides carinatusduring diapause at depth in the Angola-Benguela Front and northern Benguela upwelling regions. African Journal of Marine Science, 27 (3). pp. 653-657. DOI

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Stage C5 copepodids and adult females of the herbivorous copepod Calanoides carinatus were sampled in the Angola-Benguela frontal region and northern Benguela upwelling area off Namibia in February–March 2002, using a multiple opening/closing net system. Respiration rates of C5s collected between 400m and 700m were measured onboard at the simulated in situ temperature of 8°C and at sea surface temperature (SST ≥20°C). These data were compared to the oxygen demand of epipelagic individuals of C. carinatus caught in the upper 30m and incubated at ambient SST. Deep-living C5s consumed 0.21 ± 0.08ml O2 h−1 (g dry mass)−1 at 8°C and 0.96ml O2 h−1 (g dry mass)−1 (range 0.84–1.09) at 25.9°C. These results were substantially lower than respiration rates of 5.23 ± 0.55ml O2 h−1 (g dry mass)−1 in epipelagic individuals incubated at SST. The results reveal a reduction by 96% of metabolic rate in deep-living, diapausing C5s relative to surface-dwelling, active individuals. Only 14.4% of this metabolic reduction is explained by the lower ambient temperature at depth and a Q10 value of 2.34. Therefore, the major fraction (81.6%) of the metabolic reduction is attributable to active physiological changes or processes during diapause at depth. The study emphasises the importance for herbivorous copepods, in areas with a highly variable food supply, to adopt a dormant phase in their life cycle in order to survive long periods of starvation.

Document Type: Article
Programme Area: UNSPECIFIED
Research affiliation: Ecology > Fisheries Biology
Refereed: Yes
Open Access Journal?: No
ISSN: 1814-232X
Date Deposited: 05 Mar 2020 15:30
Last Modified: 01 Oct 2020 13:01

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