Journal article
Deriving population scaling rules from individual-level metabolism and life history traits
Individual metabolism generally scales with body mass with an exponent around 3/4. From dimensional arguments it follows that maximum population growth rate (rmax) scales with a −1/4 exponent. However, the dimensional argument implicitly assumes that offspring size is proportional to adult size. Here we calculate rmax from metabolic scaling at the level of individuals within size-structured populations while explicitly accounting for offspring size.
We identify four general patterns of how rmax scales with adult mass based on four empirical life-history patterns employed by groups of species. These life-history patterns are determined by how traits of somatic growth rate and/or offspring mass relate to adult mass. One life-history pattern – constant adult:offspring mass ratio and somatic growth rate independent of adult mass – leads to the classic −1/4 scaling of rmax.
The other three life-history patterns lead either to non-metabolic population growth scaling with adult mass or do not follow a power-law relationship at all. Using life-history data of five marine taxa and terrestrial mammals, we identify species groups that belong to one of each case. We predict that elasmobranchs, copepods, and mammals follow standard −1/4 power-law scaling, whereas teleost fish and bivalves do not have a pure power-law scaling.
Our work highlights how taxa may deviate from the classic −1/4 metabolic scaling pattern of maximum population growth. The approach is generic and can be applied to any taxa.
Language: | English |
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Year: | 2022 |
ISSN: | 15375323 and 00030147 |
Types: | Journal article |
DOI: | 10.5281/zenodo.5531628 |
ORCIDs: | Denechere, Rémy , van Denderen, P. Daniël and Andersen, Ken H. |