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Marine Ecology Progress Series

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MEPS 724:47-65 (2023)  -  DOI:

Carbon budgets of copepod communities in the northern Humboldt Current System off Peru

Anna Schukat1,*, Maya Bode-Dalby1, Jana C. Massing2,3, Wilhelm Hagen1, Holger Auel1

1Universität Bremen, BreMarE—Bremen Marine Ecology, Marine Zoology, 28359 Bremen, Germany
2Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg (HIFMB), 26129 Oldenburg, Germany
3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, 27570 Bremerhaven, Germany
*Corresponding author:

ABSTRACT: Abundance, biomass and respiration rates of dominant medium- to larger-sized copepod species (ML class) from the upwelling system off Peru (8.5-16°S) were determined along with their carbon ingestion and egestion rates. Small copepods (S class) were included for comparisons of community rates. Overall, abundance/biomass was highest in the upper 50 m and decreased with depth and thus also community ingestion and egestion. Ingestion of the ML class (0-50 m) in shelf regions (14-515 mg C m-2 d-1) was lower in the south compared to the north and central study areas, while their offshore ingestion (11-502 mg C m-2 d-1) was comparable across regions (8.5-16°S). Ingestion rates (0-50 m) of the S class were in a range similar to those of the ML class in shelf regions (100-417 mg C m-2 d-1) but were higher offshore (177-932 mg C m-2 d-1). Calanus chilensis and the S class contributed most to total ingestion in the north, while in the south, Centropages brachiatus had the highest community ingestion aside from the S class. Egestion varied from 3-155 mg C m-2 d-1 for the ML class and 30-280 mg C m-2 d-1 for the S class. The high community rates highlight the crucial role of both size classes for carbon budgets in the northern Humboldt Current System off Peru and indicate that the ML class may enhance passive vertical carbon flux, whereas the S class may support carbon remineralization rates in surface waters.

KEY WORDS: Upwelling · Biological carbon pump · Consumption rate · Calanoid copepods

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Cite this article as: Schukat A, Bode-Dalby M, Massing JC, Hagen W, Auel H (2023) Carbon budgets of copepod communities in the northern Humboldt Current System off Peru. Mar Ecol Prog Ser 724:47-65.

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