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Trends Ecol Evol. 2013 Jul;28(7):423-31. doi: 10.1016/j.tree.2013.03.008. Epub 2013 Apr 24.

Ecosystem ecology: size-based constraints on the pyramids of life.

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Earth to Ocean Research Group, Biological Sciences, Simon Fraser University, 8888 University Drive, Vancouver, BC, V5S 1A6, Canada.


Biomass distribution and energy flow in ecosystems are traditionally described with trophic pyramids, and increasingly with size spectra, particularly in aquatic ecosystems. Here, we show that these methods are equivalent and interchangeable representations of the same information. Although pyramids are visually intuitive, explicitly linking them to size spectra connects pyramids to metabolic and size-based theory, and illuminates size-based constraints on pyramid shape. We show that bottom-heavy pyramids should predominate in the real world, whereas top-heavy pyramids indicate overestimation of predator abundance or energy subsidies. Making the link to ecological pyramids establishes size spectra as a central concept in ecosystem ecology, and provides a powerful framework both for understanding baseline expectations of community structure and for evaluating future scenarios under climate change and exploitation.

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