Oecologia

, Volume 178, Issue 3, pp 723–732 | Cite as

Trade-offs between growth and maturation: the cost of reproduction for surviving environmental extremes

Population ecology - Original research

Abstract

Life-history trade-offs and the costs of reproduction are central concepts in evolution and ecology. Episodic climatic events such as drought and extreme temperatures provide strong selective pressures that can change the balance of these costs and trade-offs. We used size-structured matrix models parameterized from field and laboratory studies to examine the effect of periodic drought on two species of aquatic salamanders (greater siren, Siren lacertina; lesser siren, Siren intermedia) that differ in size at reproduction and maximum body size. Post-drought body size distributions of the larger species (S. lacertina) are consistent with size-dependent mortality. Smaller individuals were extirpated from the population during each drought while large animals persisted, a pattern that contrasted with that seen in several ectotherms. This appears to be largely explained by estivation proficiency and a positive relationship between body size and estivation potential. Increased body size, however, may come at the cost of fecundity and maturation rate compared to a closely related congener. The cost of somatic allocation in this case may manifest itself via reduced per-capita competitive ability, which (at least in simulation studies) allows the smaller, fast-maturing species to outcompete the larger, slow-maturing species when drought is minimal or nonexistent.

Keywords

Body size Life-history strategy Reproductive allocation Estivation Drought Size structure 

Supplementary material

442_2015_3270_MOESM1_ESM.pdf (556 kb)
Supplementary material 1 (PDF 555 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Division of Biological SciencesUniversity of MissouriColumbiaUSA
  2. 2.Savannah River Ecology LaboratoryAikenUSA
  3. 3.Fisheries and WildlifeMichigan State UniversityEast LansingUSA

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