Abstract
Aquatic biodiversity continues to decline as humans modify the landscape, mainly because of stream habitat alterations and loss caused by urban development. Bluehead chubs may mitigate some effects of instream habitat degradation by providing clean gravel substrate via their spawning nests. We used path analysis, an extension of multiple linear regression, to explore the relationships among instream habitat degradation, adult chub abundance, chub nesting activity, and chub reproductive performance. Age-0 chub abundance was best explained by small adult abundance and nest abundance. Habitat disturbance indirectly and negatively influenced age-0 chub abundance through adult chubs and nest abundance. Percentages of pool and run habitat also had indirect negative effects on age-0 chub abundance. Several metrics of chub nesting activity (nest density [proportion of substrate occupied by nests], average nest size, and number of nests) were explained by both adult chub abundance and nesting site conditions. Variability among stream systems described significant variation in adult chub abundance and nesting characteristics and, if unaccounted for, would have resulted in large unexplained variability. Chub nesting activity served as a link between habitat degradation, adult chub abundance, and their reproductive performance. Our study provides preliminary evidence that bluehead chubs’ nesting activity may be a mechanism of their persistence in degraded stream reaches. We recommend confirmatory studies through in-stream manipulative experiments.
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Acknowledgements
This research was funded by a grant from the Virginia Agricultural Experimental Station. We also thank J. Pritt, R. Pendleton, A. Geisler, V. Wooton, J. T. Deweber, Y. Ansah, M. L. Henebry, and J. Herrala for help with field work.
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Peoples, B.K., Tainer, M.B. & Frimpong, E.A. Bluehead chub nesting activity: a potential mechanism of population persistence in degraded stream habitats. Environ Biol Fish 90, 379–391 (2011). https://doi.org/10.1007/s10641-010-9748-0
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DOI: https://doi.org/10.1007/s10641-010-9748-0