Efficiency of crustacean zooplankton in transferring allochthonous carbon in a boreal lake

Increased incorporation of terrestrial organic matter (t-OM) into consumer biomass (allochthony) is believed to reduce growth capacity. In this study, we examined the relationship between crustacean zooplankton allochthony and production in a boreal lake that displays strong seasonal variability in t-OM inputs. Contrary to our hypotheses, we found no effect of allochthony on production at the community and the species levels. The high-frequency seasonal sampling (time-for-space) allowed for estimating the efficiency of zooplankton in converting this external carbon source to growth. From the daily t-OM inputs in the lake (57-3,027 kg C/d), the zooplankton community transferred 0.2% into biomass (0.01-2.36 kg C/d); this level was of the same magnitude as the carbon transfer efficiency for algal-derived carbon (0.4%). In the context of the boundless carbon cycle, which integrates inland waters as a biologically active component of the terrestrial landscape, the use of the time-for-space approach for the quantifying of t-OM trophic transfer efficiency by zooplankton is a critical step toward a better understanding of the effects of increasing external carbon fluxes on pelagic food webs.

Vachon, DominicUmeå universitet,Institutionen för ekologi, miljö och geovetenskap,Arcum(Swepub:umu)dova0005 (author)
del Giorgio, Paul A. (author)
Rautio, Milla (author)
Umeå universitetInstitutionen för ekologi, miljö och geovetenskap (creator_code:org_t)

By the author/editor: Grosbois, Guilla ...; Vachon, Dominic; del Giorgio, Pau ...; Rautio, Milla

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