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Watershed Land Use and Seasonal Variation Constrain the Influence of Riparian Canopy Cover on Stream Ecosystem Metabolism

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Abstract

Ecosystem metabolism is an important determinant of trophic structure, nutrient cycling, and other critical ecosystem processes in streams. Whereas watershed- and local-scale controls on stream metabolism have been independently investigated, little is known about how controls exerted at different scales interact to determine stream metabolic rates, particularly in urban streams and across seasons. To address this knowledge gap, we measured ecosystem metabolism in four urban and four reference streams in northern Kentucky, USA, with paired closed and open riparian canopies, during each of the four seasons. Gross primary production (GPP), ecosystem respiration, and net ecosystem production (NEP) were all best predicted by models with season as a main effect, but interactions between season, canopy, and watershed varied for each response. Urban streams exhibited higher GPP during most seasons, likely due to elevated nutrient loads. Open canopy reaches in both urban and forested streams, supported higher rates of GPP than the closed canopy which reaches during the summer and fall, when the overhead vegetation shaded the closed reaches. The effect of canopy cover on GPP was similar among urban and forested streams. The combination of watershed and local-scale controls resulted in urban streams that alternated between net heterotrophy (NEP <0) and net autotrophy (NEP >0) at the reach-scale during seasons with dense canopy cover. This finding has management relevance because net production can lead to accumulation of algal biomass and associated issues like nighttime hypoxia. Our study suggests that although watershed urbanization fundamentally alters ecosystem function, the preservation and restoration of canopied riparian zones can provide an important management tool at the local scale, with the strongest impacts on stream metabolism during summer.

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Acknowledgments

The research support was provided by the University of Cincinnati and the Wieman Wendel Benedict Award program. We would like to thank Jennifer Davisson, Mark Mitchell, Kate Johnson, Kevin Ley, Steven Doyle, Vivian Miller, Matt Wooten, and Elizabeth Fet for their assistance in the field and the laboratory. We would also like to thank Ken Fritz for helpful reviews that greatly improved the earlier versions of this manuscript. The views expressed in this paper are those of the author[s] and do not necessarily reflect the views or policies of the U.S. Environmental Protection Agency.

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Correspondence to Jeremy M. Alberts.

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JMA, IB, and JJB conceived of the project, and designed the research plan. JMA conducted field research and lab measurements, and carried out modeling and statistical analyses with input from IB and JJB. JMA wrote the manuscript with contributions from all authors

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Alberts, J.M., Beaulieu, J.J. & Buffam, I. Watershed Land Use and Seasonal Variation Constrain the Influence of Riparian Canopy Cover on Stream Ecosystem Metabolism. Ecosystems 20, 553–567 (2017). https://doi.org/10.1007/s10021-016-0040-9

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