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Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern

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Published on: March 8, 2020

Sizing up your enemy: individual predation vulnerability predicts migratory probability.

Christian Skov¹, Henrik Baktoft, Jakob Brodersen

¹National Institute of Aquatic Resources, Technical University of Denmark (DTU), Vejlsøvej 39, Silkeborg 8600, Denmark. ck@aqua.dtu.dk

Proceedings. Biological Sciences

|October 29, 2010

Summary

This summary is machine-generated.

Partial migration, where some animals migrate and others stay, is influenced by individual predation risk. Smaller bream migrate more often than larger ones, suggesting predation risk drives this size-dependent behavior.

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Area of Science:

Ecology
Behavioral Ecology
Evolutionary Biology

Background:

Partial migration, with a fraction of a population migrating and others remaining resident, is observed across diverse species and can significantly impact ecosystems.
The drivers of individual migratory tendency are debated, with a known trade-off between predation risk and growth potential influencing migration timing.

Purpose of the Study:

To investigate the role of individual predation risk in predicting partial migration patterns in wild bream (Abramis brama) populations.
To provide empirical support for the hypothesis that phenotypic variation in predation risk mediates migration decisions.

Main Methods:

Cross-population empirical study on wild bream (Abramis brama).
Analysis of individual predation risk and its correlation with migratory tendency.
Comparison of migration patterns between smaller, high-risk individuals and larger, low-risk individuals.

Main Results:

Individual predation risk was found to be a significant predictor of partial migration in bream.
Smaller bream, facing higher predation risk, exhibited a higher probability of migration compared to larger bream.
A clear size-dependent pattern in partial migration was observed, linked to differential predation risk.

Conclusions:

Predation risk is a key factor influencing individual decisions in partial migration systems.
The study supports the model where individual predation risk mediates the trade-off between risks and benefits, driving size-dependent migration in bream.
Predation risk plays a crucial role in maintaining size-dependent partial migration in this freshwater fish system.