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Related Experiment Video

Updated: Feb 25, 2026

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Resource-allocation tradeoffs in caddisflies facing multiple stressors.

Francisco Correa-Araneda1, Ana Basaguren2, Roberto T Abdala-Díaz3

  • 1Laboratory of Ecotoxicology Department of Zoology Faculty of Natural and Oceanographic Sciences University of Concepción Concepción Chile.

Ecology and Evolution
|August 4, 2017
PubMed
Summary

Exotic Eucalyptus litter harms cased caddisfly larvae, increasing mortality and reducing growth. Predator cues prompted better case construction despite poor food quality, showing resource allocation tradeoffs.

Keywords:
Trichopteraantipredatory defenselarval fitnessresource qualitytemperature

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Area of Science:

  • Ecology
  • Environmental Science
  • Aquatic Biology

Background:

  • Exotic tree monocultures, like Eucalyptus, degrade stream leaf litter quality and riparian cover.
  • This impacts stream detritivores, crucial for litter breakdown, with cased caddisflies being particularly vulnerable.
  • Caddisfly larvae are sensitive to warming and expend energy on case construction, a potential burden under stress.

Purpose of the Study:

  • To investigate how Eucalyptus litter affects cased caddisfly (Sericostoma pyrenaicum) case construction.
  • To determine if elevated temperatures exacerbate negative effects of poor-quality litter.
  • To assess if predator cues influence case construction under resource limitation.

Main Methods:

  • A microcosm experiment using Sericostoma pyrenaicum larvae.
  • Comparing responses to Eucalyptus globulus (low-quality) vs. Alnus glutinosa (high-quality) litter.
  • Manipulating temperature (10°C vs. 15°C) and presence of predator chemical cues.

Main Results:

  • Eucalyptus litter caused increased mortality, reduced growth, and impaired case construction in caddisfly larvae.
  • Temperature did not amplify the negative effects of Eucalyptus litter on case construction.
  • Predator cues induced construction of more protective cases despite lower litter quality.

Conclusions:

  • Eucalyptus litter poses significant threats to cased caddisfly survival and performance.
  • Environmental cues, like predator presence, can mediate resource allocation tradeoffs in larvae.
  • Findings highlight the ecological consequences of exotic species on freshwater ecosystems.