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Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern

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Transoceanic migration by a 12 g songbird.

William V DeLuca¹, Bradley K Woodworth², Christopher C Rimmer³

¹Department of Environmental Conservation, University of Massachusetts, Amherst, MA 01003, USA wdeluca@eco.umass.edu.

Biology Letters

|April 3, 2015

Summary

Blackpoll warblers undertake a remarkable non-stop transoceanic migration from North America to the tropics. This study provides the first definitive proof of this extraordinary long-distance flight, confirming a long-held hypothesis.

Keywords:

Atlantic Ocean Setophaga striata blackpoll warbler geolocator

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Area of Science:

Ornithology
Animal Migration
Behavioral Ecology

Background:

The migratory behavior of many small avian species remains poorly understood due to tracking limitations.
For over 50 years, the blackpoll warbler (Setophaga striata) has been hypothesized to undertake a non-stop autumn flight across the Atlantic Ocean.

Purpose of the Study:

To provide irrefutable evidence of the blackpoll warbler's autumn transoceanic migration route and duration.
To quantify the distance and time involved in this migratory feat.

Main Methods:

Deployment of miniaturized light-level geolocators on blackpoll warblers.
Analysis of geolocator data to determine flight paths and duration.

Main Results:

Confirmation of a non-stop autumn migration for the blackpoll warbler.
Transoceanic flights ranged from 2270 to 2770 km, taking up to 62 hours (±10 hours).
This represents one of the longest non-stop overwater flights recorded for a songbird.

Conclusions:

The blackpoll warbler completes an extraordinary transoceanic migration, validating previous hypotheses.
This study offers crucial insights into the migratory capabilities of small songbirds.