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Understanding oceanic migrations with intrinsic biogeochemical markers
Raül Ramos1, Jacob González-Solís, John P Croxall
1Departament Biologia Animal (Vertebrats), Universitat de Barcelona, Barcelona, Spain. ramos@ub.edu
Plos One
|July 23, 2009
Summary
Biogeochemical analysis of seabird feathers reveals distinct oceanic origins and migration routes. This method offers a cost-effective way to track marine animal movements and habitat use, aiding conservation efforts.
Area of Science:
- Marine biology
- Biogeochemistry
- Conservation science
Background:
- Migratory marine vertebrates face numerous anthropogenic threats during long-distance movements.
- Understanding migration patterns is crucial for effective marine conservation and mitigating human impacts.
- Electronic tracking devices have limitations, driving the need for alternative intrinsic markers.
Purpose of the Study:
- To evaluate the utility of biogeochemical analyses of inert tissues, specifically feathers, as tracers for marine vertebrate migration and habitat use.
- To determine if stable isotopes and elemental concentrations in feathers can differentiate oceanic water masses and seasonal habitats.
- To provide a new method for studying the migration of secretive marine species and their exposure to human-induced threats.
Main Methods:
- Biogeochemical analysis of stable isotopes and elemental concentrations in seabird feathers.
- Correlation of feather chemical signatures with known breeding origins and distinct oceanic water masses.
- Comparison of feather analyses from different time periods within the annual cycle (summer vs. winter growth).
Main Results:
- Stable isotope signatures and elemental concentrations in summer-grown feathers successfully identified distinct oceanic water masses used by breeding birds.
- Stable isotopes, but not elemental concentrations, effectively indicated water masses utilized during wintering periods.
- Elemental concentrations in feathers reflected accumulation during the breeding season, limiting their utility for winter habitat identification.
Conclusions:
- Biogeochemical analysis of inert tissues, particularly stable isotopes in feathers, is a simple and effective method for assigning marine organisms to specific oceanic areas.
- This approach provides valuable insights into migration patterns and habitat use of marine vertebrates, including secretive species.
- The findings offer new opportunities to study marine migrations and assess human-induced mortality risks on vulnerable populations.
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