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Empirical correspondence between trophic transfer efficiency in freshwater food webs and the slope of their size spectra
Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany.
Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Leibniz‐Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany.ORCID iD: 0000-0002-6503-9497
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2018 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 99, no 6, p. 1463-1472Article in journal (Refereed) Published
Abstract [en]

The density of organisms declines with size, because larger organisms need more energy than smaller ones and energetic losses occur when larger organisms feed on smaller ones. A potential expression of density-size distributions are Normalized Biomass Size Spectra (NBSS), which plot the logarithm of biomass independent of taxonomy within bins of logarithmic organismal size, divided by the bin width. Theoretically, the NBSS slope of multi-trophic communities is exactly - 1.0 if the trophic transfer efficiency (TTE, ratio of production rates between adjacent trophic levels) is 10% and the predator-prey mass ratio (PPMR) is fixed at 10(4). Here we provide evidence from four multi-trophic lake food webs that empirically estimated TTEs correspond to empirically estimated slopes of the respective community NBSS. Each of the NBSS considered pelagic and benthic organisms spanning size ranges from bacteria to fish, all sampled over three seasons in 1 yr. The four NBSS slopes were significantly steeper than -1.0 (range -1.14 to -1.19, with 95% CIs excluding -1). The corresponding average TTEs were substantially lower than 10% in each of the four food webs (range 1.0% to 3.6%, mean 1.85%). The overall slope merging all biomass-size data pairs from the four systems (-1.17) was almost identical to the slope predicted from the arithmetic mean TTE of the four food webs (-1.18) assuming a constant PPMR of 10(4). Accordingly, our empirical data confirm the theoretically predicted quantitative relationship between TTE and the slope of the biomass-size distribution. Furthermore, we show that benthic and pelagic organisms can be merged into a community NBSS, but future studies have yet to explore potential differences in habitat-specific TTEs and PPMRs. We suggest that community NBSS may provide valuable information on the structure of food webs and their energetic pathways, and can result in improved accuracy of TTE-estimates.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018. Vol. 99, no 6, p. 1463-1472
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-347754DOI: 10.1002/ecy.2347ISI: 000434094400021PubMedID: 29856494OAI: oai:DiVA.org:uu-347754DiVA, id: diva2:1195705
Funder
German Research Foundation (DFG), Me 1686/7-1Available from: 2018-04-06 Created: 2018-04-06 Last updated: 2018-08-31Bibliographically approved

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Scharnweber, KristinAttermeyer, Katrin

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