Step-patterned survivorship curves: Mortality and loss of equilibrium responses to high temperature and food restriction in juvenile rainbow trout (Oncorhynchus mykiss).

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  • Author(s): Gosselin JL;Gosselin JL; Anderson JJ; Anderson JJ
  • Source:
    PloS one [PLoS One] 2020 May 29; Vol. 15 (5), pp. e0233699. Date of Electronic Publication: 2020 May 29 (Print Publication: 2020).
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE
    • Publication Information:
      Original Publication: San Francisco, CA : Public Library of Science
    • Subject Terms:
      Fish Diseases*/metabolism ; Fish Diseases*/mortality ; Fish Diseases*/pathology ; Global Warming* ; Heat-Shock Response* ; Hot Temperature*; Oncorhynchus mykiss/*metabolism; Animals
    • Abstract:
      While survivorship curves typically exhibit smooth declines over time, step-patterned curves can occur with multiple stressors within a life stage. To explore this process, we examined the effects of heat (24°C) and food restriction on juvenile rainbow trout (Oncorhynchus mykiss Walbaum) in challenge experiments. We observed step-patterned survivorship curves determined by mortality and loss of equilibrium (LOE) endpoints. To examine the cause of heterogeneity in the stress responses from early to late mortality and LOE, we measured indices of energetic reserves. The step transition in the survivorship curves, the peak mortality rates, and start of when individuals reached a critical energetic threshold (14% dry mass; 4.0 kJ·g-1 energy) all occurred at around days 10-15 of the challenge. The coherence in these temporal patterns suggest heterogeneity in the cohort stress responses, in which an early subgroup died from heat stress and a late subgroup died from starvation. Thus, their endpoint sensitivities resulted in step-patterned survivorship curves. We discuss the implications of the study for understanding effects of multiple stressors on population heterogeneity and note the possible significance of stress response selection under climate change in which heat stress and food limitations occur in concert.
      Competing Interests: The authors have declared that no competing interests exist.
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    • Molecular Sequence:
      Dryad 10.5061/dryad.47d7wm38v
    • Publication Date:
      Date Created: 20200530 Date Completed: 20200811 Latest Revision: 20200811
    • Publication Date:
      20240105
    • Accession Number:
      PMC7259696
    • Accession Number:
      10.1371/journal.pone.0233699
    • Accession Number:
      32470036