Elevated Temperatures Enhance Movement and Aggression in an Intertidal Fish.

Area of Science:

• Marine Biology
• Animal Behavior
• Climate Change Ecology

Background:

• Temperature is a crucial environmental factor affecting animal behavior, including foraging, predator avoidance, and habitat use.
• Intertidal fish face significant thermal variability and are vulnerable to climate change.
• Understanding behavioral responses to temperature is vital for predicting ecological impacts.

Purpose of the Study:

• To investigate the effects of chronic exposure to ecologically relevant temperatures (10 °C and 20 °C) on the behavior of the common triplefin (Forsterygion lapillum).
• To assess how temperature influences activity, emergence, feeding, evasive responses, and aggression in this intertidal fish species.

Main Methods:

• Acclimation of Forsterygion lapillum to two different temperatures (10 °C and 20 °C) for six weeks.
• Behavioral assays were conducted to measure activity levels, refuge use, feeding rates, latency to move, aggression, and evasive responses to a simulated predator.
• Comparison of behavioral metrics between fish acclimated to the two temperature treatments.

Main Results:

• Fish acclimated to 20 °C consumed more food and spent less time in refuges compared to those at 10 °C.
• Higher temperatures led to increased overall activity, heightened aggression, and quicker initiation of movement in triplefins.
• No significant difference was observed in evasive responses to a simulated bird strike between temperature treatments.

Conclusions:

• Elevated temperatures significantly alter intertidal triplefin behavior, increasing activity and aggression.
• These behavioral changes present a trade-off between enhanced foraging/defense and increased energetic demands/predation risk.
• Findings emphasize the need to consider species-specific behavioral responses to warming in the context of climate change to predict effects on intertidal communities.