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Sensory environment affects Icelandic threespine stickleback's anti-predator escape behaviour.

Murielle Ålund1,2,3, Brooke Harper2, Sigurlaug Kjærnested4

  • 1Department of Ecology and Genetics, Animal Ecology, Uppsala University, Uppsala, Sweden.

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Populations adapt anti-predator behavior to new environments like low-visibility glacial lakes. Icelandic sticklebacks show rapid behavioral changes and plasticity, aiding survival in changing sensory conditions.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Animal Behavior

Background:

  • Human-induced climate and habitat changes create novel environments.
  • Reduced visibility in newly formed glacial lakes presents sensory challenges for aquatic populations.

Purpose of the Study:

  • To investigate how low-visibility conditions in glacial lakes affect anti-predator behavior in Icelandic threespine sticklebacks.
  • To understand the role of adaptation and early life experience in shaping anti-predator responses to varying sensory cues and light levels.

Main Methods:

  • Tested nearly 400 Icelandic threespine sticklebacks from 15 populations across four habitat types.
  • Assessed fish reactions to mechano-visual and olfactory predator cues under high and low-visibility light treatments.

Main Results:

  • Fish exhibited differential responses to predator cues based on modality and light environment.
  • Highland glacial fish showed rapid responses to mechano-visual cues and high plasticity in response to light levels.
  • Behavioral plasticity appears crucial for population persistence in frequently changing environments.

Conclusions:

  • Rapid changes in anti-predator behavior occur due to adaptation and/or early life experience in novel sensory habitats.
  • Behavioral plasticity plays a significant role in enabling populations to persist despite frequent environmental changes.