Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
Science Careers Booklet

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 4 December 1998:
Vol. 282. no. 5395, p. 1781
DOI: 10.1126/science.282.5395.1781h
Prev | Table of Contents | Next

This Week in Science

Studies of the population dynamics of migratory birds are hampered by the great distances between breeding and wintering habitats and the different arrival times of males and females. Marra et al. (p. 1884; see the cover and the news story by Wuethrich) use habitat-specific isotope signatures to link American redstarts (Setophaga ruticilla) in their tropical wintering grounds and temperate breeding areas. Arrival times at the breeding grounds and reproductive success are heavily influenced by competition for resources during the preceding winter: The more successful birds had carbon-13 isotope values which indicated that their insect prey were associated with richer forested habitats.




ADVERTISEMENT
Click Me!

ADVERTISEMENT
Click Me!

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)