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Necropsy-based Wild Fish Health Assessment
Published on: September 11, 2018
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Personalities influence spatial responses to environmental fluctuations in wild fish
David Villegas-Ríos1, Denis Réale2, Carla Freitas3,4
1Population Genetics and Ecology Group, Institute of Marine Research, Flødevigen, His, Norway.
The Journal of Animal Ecology
|June 12, 2018
Summary
Animal personality influences how wild fish use space. Reactive Atlantic cod reduced their home range with rising sea temperatures, unlike proactive individuals, linking personality to spatial dynamics.
Area of Science:
- Ecology and evolutionary biology
- Animal behavior
- Marine ecology
Background:
- Animal personality is known to influence responses to social changes.
- Its role in spatial plasticity due to natural environmental fluctuations is less understood.
- Spatial dynamics are crucial for linking individual and population processes.
Purpose of the Study:
- To investigate if individual animal personalities predict spatial behavior plasticity in wild fish.
- To determine if personality, specifically the proactive-reactive axis, explains differences in space use in response to sea surface temperature.
- To assess the ecological consequences of animal personality on spatial dynamics.
Main Methods:
- Assessed personality of 76 wild Atlantic cod (Gadus morhua) using laboratory assays (open-field, novel object, mirror stimulation tests).
- Monitored spatial behavior of tagged fish over 16 months across a fjord using high-resolution acoustic tracking.
- Analyzed the relationship between personality traits, sea temperature, and home range changes.
Main Results:
- Cod personality traits formed a proactive-reactive syndrome (proactive individuals were bolder, more exploratory, and aggressive).
- Individual fish depth use was primarily influenced by sea surface temperature.
- Reactive individuals, but not proactive ones, significantly reduced their home range as sea temperature increased.
Conclusions:
- Animal personality is a significant predictor of changes in wild fish home range.
- Reactive personality types exhibit greater plasticity in space use in response to environmental changes like temperature.
- These findings enhance understanding of how personality shapes spatial dynamics in natural ecosystems.
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