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Linking patch-use behavior, resource density, and growth expectations in fish.

Anders Persson1, Marika Stenberg

  • 1Department of Ecology, Limnology, Ecology Building, SE-223 62 Lund, Sweden. anders.persson@limnol.lu.se

Ecology
|August 30, 2006
PubMed
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Fish foraging behavior aligns with ecological expectations. Short-term decisions in food patches, measured by giving-up density (GUD), reflect long-term environmental quality, supporting optimality theory in natural settings.

Area of Science:

  • Ecology
  • Behavioral Ecology
  • Fisheries Science

Background:

  • Optimality theory predicts foraging decisions link to environmental quality and fitness.
  • Field validation of these assumptions, particularly linking short-term behavior to broader environmental factors, is limited.

Purpose of the Study:

  • To test optimality theory by linking fish foraging decisions to environmental quality at multiple scales.
  • To investigate the relationship between giving-up density (GUD), resource density, and fish growth parameters.

Main Methods:

  • Conducted field study in 10 lakes, measuring fish giving-up density (GUD) in experimental patches.
  • Quantified benthic invertebrate biomass (resource density) and calculated maximum bream size (L(infinity)).
  • Employed path analysis to determine direct and indirect relationships between variables.

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Main Results:

  • Positive correlations found between resource density and both GUD and L(infinity).
  • A positive relationship was observed between L(infinity) and GUD.
  • Resource density and L(infinity) significantly explained variation in GUD; resource density primarily explained L(infinity).

Conclusions:

  • Benthic fish foraging behavior (GUD) is influenced by environmental quality at larger spatial and temporal scales.
  • Findings support optimality theory, demonstrating that short-term foraging decisions reflect long-term ecological conditions.
  • Prey vulnerability to predation plays a key role in these observed relationships.