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The paradox of inverted biomass pyramids in kelp forest fish communities


Trebilco, R and Dulvy, NK and Anderson, SC and Salomon, AK, The paradox of inverted biomass pyramids in kelp forest fish communities, Proceedings of the Royal Society of London: Biological Sciences, 283, (1833) Article 20160816. ISSN 0962-8436 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 The Author(s)

DOI: doi:10.1098/rspb.2016.0816


Theory predicts that bottom-heavy biomass pyramids or ‘stacks’ should predominate in real-world communities if trophic-level increases with body size (mean predator-to-prey mass ratio (PPMR) more than 1). However, recent research suggests that inverted biomass pyramids (IBPs) characterize relatively pristine reef fish communities. Here, we estimated the slope of a kelp forest fish community biomass spectrum from underwater visual surveys. The observed biomass spectrum slope is strongly positive, reflecting an IBP. This is incongruous with theory because this steep positive slope would only be expected if trophic position decreased with increasing body size (consumer-to-resource mass ratio, less than 1). We then used δ15N signatures of fish muscle tissue to quantify the relationship between trophic position and body size and instead detected strong evidence for the opposite, with PPMR ≈ 1650 (50% credible interval 280–12 000). The natural history of kelp forest reef fishes suggests that this paradox could arise from energetic subsidies in the form of movement of mobile consumers across habitats, and from seasonally pulsed production inputs at small body sizes. There were four to five times more biomass at large body sizes (1–2 kg) than would be expected in a closed steady-state community providing a measure of the magnitude of subsidies.

Item Details

Item Type:Refereed Article
Keywords:ecosystem baseline, fractionation, habitat complexity, species interaction, size spectra, stable isotope analysis
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Trebilco, R (Dr Rowan Trebilco)
ID Code:109659
Year Published:2016
Web of Science® Times Cited:37
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2016-06-24
Last Modified:2017-11-06

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