Size-abundance rules? Evolution changes scaling relationships between size, metabolism and demography

Research output: Contribution to journalLetterResearchpeer-review

1 Citation (Scopus)

Abstract

Body size often strongly covaries with demography across species. Metabolism has long been invoked as the driver of these patterns, but tests of causal links between size, metabolism and demography within a species are exceedingly rare. We used 400 generations of artificial selection to evolve a 2427% size difference in the microalga Dunaliella tertiolecta. We repeatedly measured size, energy fluxes and demography across the evolved lineages. Then, we used standard metabolic theory to generate predictions of how size and demography should covary based on the scaling of energy fluxes that we measured. The size dependency of energy remained relatively consistent in time, but metabolic theory failed to predict demographic rates, which varied unpredictably in strength and even sign across generations. Classic theory holds that size affects demography via metabolism – our results suggest that both metabolism and size act separately to drive demography and that among-species patterns may not predict within-species processes.

Original languageEnglish
Pages (from-to)1407-1416
Number of pages10
JournalEcology Letters
Volume22
Issue number9
DOIs
Publication statusPublished - 2019

Keywords

  • Allometry
  • artificial selection
  • Centre for Geometric Biology
  • demographic parameters
  • evolutionary size-shift
  • experimental evolution
  • metabolic ecology
  • metabolic energy
  • scaling

Cite this

@article{b464cf8863154e19ada45513a297fe0a,
title = "Size-abundance rules? Evolution changes scaling relationships between size, metabolism and demography",
abstract = "Body size often strongly covaries with demography across species. Metabolism has long been invoked as the driver of these patterns, but tests of causal links between size, metabolism and demography within a species are exceedingly rare. We used 400 generations of artificial selection to evolve a 2427{\%} size difference in the microalga Dunaliella tertiolecta. We repeatedly measured size, energy fluxes and demography across the evolved lineages. Then, we used standard metabolic theory to generate predictions of how size and demography should covary based on the scaling of energy fluxes that we measured. The size dependency of energy remained relatively consistent in time, but metabolic theory failed to predict demographic rates, which varied unpredictably in strength and even sign across generations. Classic theory holds that size affects demography via metabolism – our results suggest that both metabolism and size act separately to drive demography and that among-species patterns may not predict within-species processes.",
keywords = "Allometry, artificial selection, Centre for Geometric Biology, demographic parameters, evolutionary size-shift, experimental evolution, metabolic ecology, metabolic energy, scaling",
author = "Malerba, {Martino E.} and Marshall, {Dustin J.}",
year = "2019",
doi = "10.1111/ele.13326",
language = "English",
volume = "22",
pages = "1407--1416",
journal = "Ecology Letters",
issn = "1461-023X",
publisher = "Wiley-Blackwell",
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}

Size-abundance rules? Evolution changes scaling relationships between size, metabolism and demography. / Malerba, Martino E.; Marshall, Dustin J.

In: Ecology Letters, Vol. 22, No. 9, 2019, p. 1407-1416.

Research output: Contribution to journalLetterResearchpeer-review

TY - JOUR

T1 - Size-abundance rules? Evolution changes scaling relationships between size, metabolism and demography

AU - Malerba, Martino E.

AU - Marshall, Dustin J.

PY - 2019

Y1 - 2019

N2 - Body size often strongly covaries with demography across species. Metabolism has long been invoked as the driver of these patterns, but tests of causal links between size, metabolism and demography within a species are exceedingly rare. We used 400 generations of artificial selection to evolve a 2427% size difference in the microalga Dunaliella tertiolecta. We repeatedly measured size, energy fluxes and demography across the evolved lineages. Then, we used standard metabolic theory to generate predictions of how size and demography should covary based on the scaling of energy fluxes that we measured. The size dependency of energy remained relatively consistent in time, but metabolic theory failed to predict demographic rates, which varied unpredictably in strength and even sign across generations. Classic theory holds that size affects demography via metabolism – our results suggest that both metabolism and size act separately to drive demography and that among-species patterns may not predict within-species processes.

AB - Body size often strongly covaries with demography across species. Metabolism has long been invoked as the driver of these patterns, but tests of causal links between size, metabolism and demography within a species are exceedingly rare. We used 400 generations of artificial selection to evolve a 2427% size difference in the microalga Dunaliella tertiolecta. We repeatedly measured size, energy fluxes and demography across the evolved lineages. Then, we used standard metabolic theory to generate predictions of how size and demography should covary based on the scaling of energy fluxes that we measured. The size dependency of energy remained relatively consistent in time, but metabolic theory failed to predict demographic rates, which varied unpredictably in strength and even sign across generations. Classic theory holds that size affects demography via metabolism – our results suggest that both metabolism and size act separately to drive demography and that among-species patterns may not predict within-species processes.

KW - Allometry

KW - artificial selection

KW - Centre for Geometric Biology

KW - demographic parameters

KW - evolutionary size-shift

KW - experimental evolution

KW - metabolic ecology

KW - metabolic energy

KW - scaling

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DO - 10.1111/ele.13326

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JO - Ecology Letters

JF - Ecology Letters

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