Using stable-hydrogen isotopes to reveal immigration in an Arctic-breeding songbird population.
BACKGROUND
Knowledge of immigration and emigration rates is crucial for understanding of population dynamics, yet little is known about these vital rates, especially for arctic songbirds. We estimated immigration in an Arctic population of northern wheatears on Baffin Island, Canada, by the use of stable hydrogen isotopes in tail feathers (δ(2)HK). We assumed that δ(2)HK values of juvenile (hatch-year) feathers grown at the breeding grounds were representative of the local population, while those of breeding adults were indicative of where they grew their feathers during their post-breeding molt the previous year. The extent to which adult isotope values differ from those of juveniles provides an estimate of the minimum level of immigration into the breeding population.


RESULTS
Mean δ(2)HK values did not differ in juvenile birds between years. Breeding adult birds did not differ significantly in mean δ(2)HK values compared to juveniles but did differ in their respective standard deviations, reflecting a significantly wider range of isotopic signatures in adults than in juveniles. Thirty-eight percent of the δ(2)HK values in adults were greater ± 2 SD of the mean δ(2)HK values of juveniles, suggesting that at least 38 % of the breeding adults were of non-local origin, thus immigrants from elsewhere.


CONCLUSIONS
Although the use of stable isotopes has limitations, the use of stable-hydrogen isotopic markers has the potential to contribute valuable information towards understanding immigration rates in bird populations. In our study, hydrogen isotope measurements of the feathers of northern wheatears indicated a high rate of immigration into the breeding population, which is consistent with low return rates of banded breeding adults as well as implying high emigration rates of local breeders.
Institute of Avian Research "Vogelwarte Helgoland", An der Vogelwarte 21, 26386 Wilhelmshaven, Germany.
Franz
F
Bairlein
Department of Integrative Biology, University of Guelph, Guelph, N1G 2W1 ON Canada.
D Ryan
DR
Norris
Leibniz Institute for Zoo and Wildlife Research, Alfred-Kowalke-Str. 17, 10315 Berlin, Germany.
Christian C
CC
Voigt
Environment Climate Change Canada, National Wildlife Research Centre, Carleton University, 1125 Colonel By Drive, Ottawa, K1A 0H3 ON Canada.
Erica H
EH
Dunn
Ontario Ministry of Natural Resources, 2140 East Bank Drive, Peterborough, K9J 7BS ON Canada.
David J T
DJ
Hussell
Dispersal; Immigration; Northern wheatear; Oenanthe oenanthe; Stable isotopes