Tracking Bird Migration Using Isotopes
Author Information
Author(s): Sellick Megan J., Kyser T. Kurt, Wunder Michael B., Chipley Don, Norris D. Ryan
Primary Institution: University of Guelph
Hypothesis
Isotopes can provide unique solutions to fundamental problems related to the ecology and evolution of migration and dispersal.
Conclusion
Combining stable-hydrogen and strontium isotopes can significantly improve the accuracy of tracking long-distance animal movements.
Supporting Evidence
- δDF values were correlated with latitude, while 87Sr/86Sr ratios were correlated with longitude.
- Using both isotopes improved correct assignment rates to 74% compared to less than 40% using either isotope alone.
- The study provides the first test of the hypothesis that 87Sr/86Sr ratios in birds are related to the age of underlying bedrock.
Takeaway
Scientists can use special markers in bird feathers to figure out where the birds come from and where they go, just like a treasure map!
Methodology
The study analyzed stable-hydrogen and strontium isotopes in feathers from Tree Swallows across 18 sites in North America.
Potential Biases
Potential biases may arise from sampling only marked individuals and the influence of local environmental conditions on isotope ratios.
Limitations
The study's findings may not apply to all bird species or regions due to variations in local geology and environmental factors.
Participant Demographics
The study focused on adult Tree Swallows (Tachycineta bicolor) sampled from various breeding sites across North America.
Statistical Information
P-Value
0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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