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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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Related Experiment Video

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A Temperature Gradient Assay to Determine Thermal Preferences of Drosophila Larvae
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Cannibalism by damselflies increases with rising temperature.

Denon Start1, Devin Kirk2, Dylan Shea2

  • 1Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada M5S 3B3 denon.start@mail.utoronto.ca.

Biology Letters
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

Climate warming intensifies cannibalism in damselflies by increasing activity and size differences. These findings highlight how temperature-driven intraspecific interactions impact ecological communities.

Keywords:
body sizeconsumer-resourcegape-limited predationpredation

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Behavioral Ecology

Background:

  • Climate warming is altering trophic interactions within ecosystems.
  • Intraspecific interactions, particularly cannibalism, can be exacerbated by temperature-driven changes in individual growth and behavior.

Purpose of the Study:

  • To investigate the effects of temperature on activity, growth, and size asymmetry in damselflies (Lestes congener).
  • To determine how these temperature-dependent factors influence intraspecific cannibalism.

Main Methods:

  • Experimental manipulation of temperature.
  • Measurement of damselfly activity rates, growth rates, and body size variation.
  • Quantification of cannibalism rates at different temperatures.

Main Results:

  • Increased temperatures led to higher activity rates and amplified size differences among damselflies.
  • Both increased activity and size asymmetry interacted to significantly elevate cannibalism rates at higher temperatures.
  • The study species, Lestes congener, exhibited marked intraspecific size variation influenced by temperature.

Conclusions:

  • Temperature-dependent changes in activity and size asymmetry can significantly increase intraspecific cannibalism.
  • Findings suggest that the impact of climate change on ecological communities may depend on how intraspecific interactions respond to warming.
  • The results are likely applicable to other species with life-history stages exhibiting varied temperature dependencies.