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Temperature-Dependent Growth of Brook TroutThe growth of brook trout is closely influenced by water temperature. Experimental data demonstrate how trout weight changes over a 24-day period in response to varying water temperatures. At lower temperatures, such as 15.5 degrees Celsius, brook trout show significant weight gain. However, as the temperature increases, the amount of weight gained steadily decreases. At the highest temperature measured, 24.4 degrees Celsius, trout experience a net...
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Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
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Can optimal resource allocation models explain why ectotherms grow larger in cold?

J Kozlowski1, M Czarnoleski, M Danko

  • 1Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland.

Integrative and Comparative Biology
|June 17, 2011
PubMed
Summary

Organisms are either determinate or indeterminate growers, with growth rates influenced by food availability and physiological constraints. Optimal resource allocation models explain the temperature-size rule, but it

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Physiology

Background:

  • Organisms exhibit determinate or indeterminate growth patterns post-maturation.
  • Determinate growers cease growth, while indeterminate growers continue growing, requiring different size measurements (e.g., asymptotic size).
  • Growth rates are influenced by food availability, physiological constraints, and resource allocation.

Purpose of the Study:

  • To explore the factors influencing growth rates in determinate and indeterminate growers.
  • To investigate the role of resource allocation in adult growth limitation for indeterminate growers.
  • To explain the temperature-size rule using optimal resource allocation models.

Main Methods:

  • Classification of organisms into determinate and indeterminate growth types.
  • Analysis of growth rate determinants based on physiological constraints and resource allocation.
  • Application of optimal resource allocation models to explain the temperature-size rule.

Main Results:

  • Juvenile growth mechanisms are similar in both growth types; adult growth in indeterminate growers is limited by reproduction and mortality rates.
  • Optimal resource allocation models support the temperature-size rule under specific conditions of changing metabolic and acquisition rates with temperature.
  • The temperature-size rule is not universal and can be violated under certain parameter ranges and mortality rates.

Conclusions:

  • Resource allocation strategies significantly impact organismal growth patterns and size.
  • The temperature-size rule is a consequence of optimizing resource allocation in response to environmental factors like temperature and mortality.
  • Understanding these principles is crucial for predicting organismal responses to environmental change.