Erratum: Isotopic (δ ² H _f ) evidence of “loop migration” and use of the Gulf of Maine Flyway by both western and eastern breeding populations of Blackpoll Warblers

Our earlier report of breeding/natal ground assignment, through the use of feather deuterium samples (δ2Hf) of Blackpoll Warblers (Setophaga striata) during spring and fall migration at various sites in North America, contained an erroneous breeding origin map derived for a group of birds sampled during spring migration in Florida. Updated analyses revealed a broader breeding range assignment than previously reported, but this change does not affect our original conclusions that Blackpoll Warblers exhibit a “loop migration” pattern as they move between breeding and wintering areas. Evidencia isotópica (δ2Hf) de “migración en bucle” y uso de la ruta del Golfo de Maine por poblaciones reproductivas del este y el oeste del chipe Setophaga striata Nuestro reporte previo sobre la asignación de sitios de anidación/natales con base en muestras de deuterio (δ2Hf) del chipe Setophaga striata capturados durante las migraciones de primavera y otoño en varios sitios de Norteamérica, contienen un mapa erróneo de anidación-origen derivado de un grupo de aves muestreado durante la migración de primavera en Florida. Análisis actualizados revelan una asignación de rango reproductivo más amplia que la previamente reportada, si bien este cambio no afecta nuestra conclusión original de que los individuos de S. striata exhiben un patrón de “migración en bucle” cuando se desplazan entre áreas de reproducción y de invernada. During a recent review of our dataset of stable hydrogen isotope ratios in feathers (δ2Hf) used to assign breeding and natal origins of Blackpoll Warblers (Setophaga striata) migrating through various locations in North America during spring and fall migration (Holberton et al. 2015), we discovered that crown feather samples taken in Florida (N = 56) in spring clearly included not only feathers grown on the breeding grounds, but also those grown during the prealternate molt in wintering areas. This resulted in some δ2Hf values being erroneously included in the breeding/natal ground assignment of these birds. Our previous analysis restricted breeding/natal grounds assignment of this group primarily to the southeastern portions of the breeding range in southern Quebec, New England, and the Maritime provinces (Fig. 3 in Holberton et al. 2015). After applying a conservative δ2Hf threshold (< −67‰) to better depict breeding/natal origins of this sample, a new analysis (N = 7) provides a more realistic portrayal of breeding/natal origins of the Blackpoll Warblers sampled as they moved through eastern Florida. Further, it changes the statistical analysis for the season and site comparisons. The statistical results remain similar, except that the removal of the prealternate molt samples changes our previous conclusion that Florida samples were enriched compared to the other sampling locations (see revised Table 2). Our reanalysis is congruent with the earlier assignment pattern, but allows for a greater range of breeding/natal origin for this group of birds (Fig. 1 and associated legend below), and our earlier conclusion that Western and Eastern populations of Blackpoll Warblers diverge while moving north through Florida in spring may be less robust. We have also redrawn Figure 5 in Holberton et al. (2015) to reflect the change in sample size for birds sampled in Florida during spring migration (Fig. 5 and associated legend below). We thank Ricky Dunn for reviewing our original data and bringing this oversight to our attention, and Gary Ritchison for help in publishing this erratum.

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