Grosbois, Guillaume
- University of Montreal
- University of Quebec Montreal (UQAM)
- Université du Québec à Chicoutimi
Abstract
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.
Keywords
allochthony; allochtrophy; carbon transfer efficiency; Cyclops scutifer; Daphnia; Leptodiaptomus minutus; seasonal pattern; secondary production; stable isotopes
Published in
Ecology
2020, volume: 101, number: 6, article number: e03013
Publisher: WILEY
SLU Authors
UKÄ Subject classification
Ecology
Publication identifier
- DOI: https://doi.org/10.1002/ecy.3013
Permanent link to this page (URI)
https://res.slu.se/id/publ/105195