Winter Habitat Quality but not Long- distance Dispersal Inﬂuences Apparent Reproductive Success in a Migratory Bird
Version of Record
Aster models, breeding dispersal, carry-over effects, deuterium, long-distance dispersal, natal dispersal, seasonal interactions
Long- distance breeding and natal dispersal play central roles in many ecological and evolutionary processes, including gene ﬂow, population dynamics, range expansion, and individual responses to ﬂuctuating biotic and abiotic conditions. However, the relative contribution of long- distance dispersal to these processes depends on the ability of dispersing individuals to successfully reproduce in their new environment. Unfortunately, due to the difﬁculties associated with tracking dispersal in the ﬁeld, relatively little is known about its reproductive consequences. Furthermore, because reproductive success is inﬂuenced by a variety of processes, disentangling the inﬂuence of each of these processes is critical to understanding the direct consequences of dispersal. In this study, we used stable hydrogen and carbon isotopes to estimate long- distance dispersal and winter territory quality in a migratory bird, the American Redstart (Setophaga ruticilla). We then applied Aster life-history models to quantify the strength of inﬂuence of these factors on apparent reproductive success. We found no evidence that male or female reproductive success was lower for long- distance dispersers relative to non- dispersing individuals. In contrast, carry- over effects from the winter season did inﬂuence male, but not female, reproductive success. Use of Aster models further revealed that for adult males, winter territory quality inﬂuenced the number of offspring produced whereas for yearling males, high- quality winter territories were associated with higher mating and nesting success. These results suggest that although long- distance natal and breeding dispersal carry no immediate reproductive cost for American Redstarts, reproductive success in this species may ultimately be limited by the quality of winter habitat.
DOI of Published Version
Ecological Society of America
Copyright by the Ecological Society of America
Rushing, Clark S.; Marra, Peter P.; and Dudash, Michele R., "Winter Habitat Quality but not Long- distance Dispersal Inﬂuences Apparent Reproductive Success in a Migratory Bird" (2016). Natural Resource Management Faculty Publications. 220.
This work was published in Ecology 97(5), 2016, pp.1218-1227. DOI:10.1890/15-1259.1
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