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Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

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Published on: March 8, 2020

Individual improvements and selective mortality shape lifelong migratory performance.

Fabrizio Sergio¹, Alessandro Tanferna¹, Renaud De Stephanis¹

¹Department of Conservation Biology, Estación Biológica de Doñana-CSIC, Avenida Americo Vespucio, 41092 Seville, Spain.

|September 26, 2014

Summary

Migratory performance in raptorial birds develops gradually throughout life, driven by individual skill improvements and early-life selective mortality. This lifelong development impacts survival and reproduction.

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Area of Science:

Animal behavior
Ecology
Evolutionary biology

Background:

Annual migration is a widespread phenomenon across taxa, yet developmental trajectories of migratory performance remain poorly understood.
Previous studies often simplified age-related differences to a juvenile vs. adult dichotomy, overlooking gradual changes and underlying mechanisms.

Purpose of the Study:

To investigate the age-specific development of migratory performance in raptorial birds.
To differentiate between individual improvements and selective mortality as drivers of age-related performance variation.
To understand how migratory tactics and environmental factor exploitation change across an individual's lifespan.

Main Methods:

Long-term monitoring of 92 individual raptorial birds using Global Positioning System (GPS) satellite tracking.
Analysis of 364 migration episodes across a wide age range (1-27 years).
Combination of within-individual and cross-sectional data to assess developmental trajectories.

Main Results:

Migratory behavior development follows a gradual, prolonged trajectory, extending beyond previous assumptions.
Both individual skill enhancement and selective mortality contribute to improved performance, primarily in early life and pre-breeding migrations.
Age-related differences in travel tactics, wind exploitation, and drift coping were observed.

Conclusions:

Migratory performance development is a protracted process influenced by both intrinsic individual learning and extrinsic selective pressures.
Early migration departure is a critical factor influencing subsequent life-history events like recruitment, reproduction, and survival.
Understanding developmental impacts of environmental changes on young migrants is crucial for conservation efforts.