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Time-limited environments affect the evolution of egg-body size allometry
Stockholm University, Faculty of Science, Department of Zoology.
Stockholm University, Faculty of Science, Department of Zoology.
Stockholm University, Faculty of Science, Department of Zoology. Universidad Nacional Autónoma de México, Mexico.
Stockholm University, Faculty of Science, Department of Zoology.
Number of Authors: 4
2017 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 71, no 7, 1900-1910 p.Article in journal (Refereed) Published
Abstract [en]

Initial offspring size is a fundamental component of absolute growth rate, where large offspring will reach a given adult body size faster than smaller offspring. Yet, our knowledge regarding the coevolution between offspring and adult size is limited. In time-constrained environments, organisms need to reproduce at a high rate and reach a reproductive size quickly. To rapidly attain a large adult body size, we hypothesize that, in seasonal habitats, large species are bound to having a large initial size, and consequently, the evolution of egg size will be tightly matched to that of body size, compared to less time-limited systems. We tested this hypothesis in killifishes, and found a significantly steeper allometric relationship between egg and body sizes in annual, compared to nonannual species. We also found higher rates of evolution of egg and body size in annual compared to nonannual species. Our results suggest that time-constrained environments impose strong selection on rapidly reaching a species-specific body size, and reproduce at a high rate, which in turn imposes constraints on the evolution of egg sizes. In combination, these distinct selection pressures result in different relationships between egg and body size among species in time-constrained versus permanent habitats.

Place, publisher, year, edition, pages
2017. Vol. 71, no 7, 1900-1910 p.
Keyword [en]
Growth rate, killifish, life-history evolution, maternal investment, rate of evolution, reproduction
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-145809DOI: 10.1111/evo.13286ISI: 000405888100014OAI: oai:DiVA.org:su-145809DiVA: diva2:1137075
Available from: 2017-08-30 Created: 2017-08-30 Last updated: 2017-08-30Bibliographically approved

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Eckerström-Liedholm, SimonSowersby, WillGonzalez-Voyer, AlejandroRogell, Björn
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