Reproductive Contributions of Cardinals Are Consistent with a Hypothesis of Relaxed Selection in Urban Landscapes

Amanda D Rodewald,Peter Arcese

doi:10.3389/fevo.2017.00077

Abstract

Human activities are leading to rapid environmental change globally and may affect the eco-evolutionary dynamics of species inhabiting human-dominated landscapes. Theory suggests that increases in environmental heterogeneity should promote variation in reproductive performance among individuals. At the same time, we know that novel environments, such as our urbanizing study system, may represent more benign or predictable environments due to resource subsidies and ecological changes. We tested the hypothesis that reduced environmental heterogeneity and enhanced resource availability in cities relax selective pressures on birds by testing if urban females vary less than rural females in their demographic contributions to local populations. From 2004-2014, we monitored local population densities and annual reproductive output of 470 female Northern Cardinals (Cardinalis cardinalis) breeding at 14 forested sites distributed across a rural-to-urban landscape gradient in Ohio, USA. Reproductive contribution was measured as the difference between individual and site-averaged annual reproductive output across all nesting attempts, divided by the annual density at each site. We show that among-individual variation in reproductive contribution to the next year’s population declined with increasing urbanization, despite similar variability in body condition across the rural-urban gradient. Thus, female cardinals that bred in urban habitats within our study area were more similar in their contribution to the next generation than rural breeders, where a pattern of winners and losers was more evident. Within-individual variation in annual reproductive contribution also declined with increasing urbanization, indicating that performance of females was also more consistent among years in urban than rural landscapes. These findings are consistent with the hypothesis that urbanized environments offer more homogeneous or predictable conditions that may buffer individuals from environmental heterogeneity and relax natural selection.

Highlights

Human activities are causing rapid and novel environmental change around the planet, highlighting a need to understand how non-human species adapt to such changes
Despite marked variation in the reproductive contributions of individuals, the mean number of fledglings produced by females at a site in a given year was similar across the rural-urban landscape gradient [F(1, 99) = 0.06; P = 0.81, n = 113; Table 1]
Despite heterogeneity in the reproductive contributions of females across the rural-urban gradient, similar patterns did not emerge with respect to body condition

Summary

Introduction

Human activities are causing rapid and novel environmental change around the planet, highlighting a need to understand how non-human species adapt to such changes. Evolutionary and ecological processes are often characterized as operating on different time scales, rapid environmental change can lead to strong natural selection and rapid adaptive evolution (Thompson, 1998; Reznick and Ghalambor, 2001; Hendry et al, 2008). Perhaps nowhere is an understanding of the interplay between ecological and evolutionary processes more urgently needed than in human-altered systems, where anthropogenic disturbance can lead to strong selection on fitness traits (Stockwell et al, 2003; Kinnison and Hairston, 2007; Hendry et al, 2011). A recent global meta-analysis of 1,600 phenotypic changes across species, regions, and ecosystems showed that rates of phenotypic change were greater urban than nonurban systems, consistent with an hypothesis of strong selection (Alberti et al, 2017)

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Conclusion