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

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.