Light and flow regimes regulate the metabolism of rivers

Emily S. Bernhardt; Phil Savoy; Michael J. Vlah; Alison P. Appling; Lauren E. Koenig; Robert O. Hall; Maite Arroita; Joanna R. Blaszczak; Alice M. Carter; Matt Cohen; Judson W. Harvey; James B. Heffernan; Ashley M. Helton; Jacob D. Hosen; Lily Kirk; William H. McDowell; Emily H. Stanley; Charles B. Yackulic; Nancy B. Grimm

doi:10.1073/pnas.2121976119

Light and flow regimes regulate the metabolism of rivers

Emily S. Bernhardt, Phil Savoy, Michael J. Vlah, Alison P. Appling, Lauren E. Koenig, Robert O. Hall, Maite Arroita, Joanna R. Blaszczak, Alice M. Carter, Matt Cohen, Judson W. Harvey, James B. Heffernan, Ashley M. Helton, Jacob D. Hosen, Lily Kirk, William H. McDowell, Emily H. Stanley, Charles B. Yackulic, Nancy B. Grimm

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

Mean annual temperature and mean annual precipitation drive much of the variation in productivity across Earth's terrestrial ecosystems but do not explain variation in gross primary productivity (GPP) or ecosystem respiration (ER) in flowing waters. We document substantial variation in the magnitude and seasonality of GPP and ER across 222 US rivers. In contrast to their terrestrial counterparts, most river ecosystems respire far more carbon than they fix and have less pronounced and consistent seasonality in their metabolic rates. We find that variation in annual solar energy inputs and stability of flows are the primary drivers of GPP and ER across rivers. A classification schema based on these drivers advances river science and informs management.

Original language	English (US)
Article number	e2121976119
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	119
Issue number	8
DOIs	https://doi.org/10.1073/pnas.2121976119
State	Published - Feb 22 2022
Externally published	Yes

Keywords

Flow regimes
Light regimes
Metabolism
River ecosystems

ASJC Scopus subject areas

General

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10.1073/pnas.2121976119

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Bernhardt, E. S., Savoy, P., Vlah, M. J., Appling, A. P., Koenig, L. E., Hall, R. O., Arroita, M., Blaszczak, J. R., Carter, A. M., Cohen, M., Harvey, J. W., Heffernan, J. B., Helton, A. M., Hosen, J. D., Kirk, L., McDowell, W. H., Stanley, E. H., Yackulic, C. B., & Grimm, N. B. (2022). Light and flow regimes regulate the metabolism of rivers. Proceedings of the National Academy of Sciences of the United States of America, 119(8), Article e2121976119. https://doi.org/10.1073/pnas.2121976119

Bernhardt, ES, Savoy, P, Vlah, MJ, Appling, AP, Koenig, LE, Hall, RO, Arroita, M, Blaszczak, JR, Carter, AM, Cohen, M, Harvey, JW, Heffernan, JB, Helton, AM, Hosen, JD, Kirk, L, McDowell, WH, Stanley, EH, Yackulic, CB & Grimm, NB 2022, 'Light and flow regimes regulate the metabolism of rivers', Proceedings of the National Academy of Sciences of the United States of America, vol. 119, no. 8, e2121976119. https://doi.org/10.1073/pnas.2121976119

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abstract = "Mean annual temperature and mean annual precipitation drive much of the variation in productivity across Earth's terrestrial ecosystems but do not explain variation in gross primary productivity (GPP) or ecosystem respiration (ER) in flowing waters. We document substantial variation in the magnitude and seasonality of GPP and ER across 222 US rivers. In contrast to their terrestrial counterparts, most river ecosystems respire far more carbon than they fix and have less pronounced and consistent seasonality in their metabolic rates. We find that variation in annual solar energy inputs and stability of flows are the primary drivers of GPP and ER across rivers. A classification schema based on these drivers advances river science and informs management.",

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AU - Bernhardt, Emily S.

AU - Savoy, Phil

AU - Vlah, Michael J.

AU - Appling, Alison P.

AU - Koenig, Lauren E.

AU - Hall, Robert O.

AU - Arroita, Maite

AU - Blaszczak, Joanna R.

AU - Carter, Alice M.

AU - Cohen, Matt

AU - Harvey, Judson W.

AU - Heffernan, James B.

AU - Helton, Ashley M.

AU - Hosen, Jacob D.

AU - Kirk, Lily

AU - McDowell, William H.

AU - Stanley, Emily H.

AU - Yackulic, Charles B.

AU - Grimm, Nancy B.

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AB - Mean annual temperature and mean annual precipitation drive much of the variation in productivity across Earth's terrestrial ecosystems but do not explain variation in gross primary productivity (GPP) or ecosystem respiration (ER) in flowing waters. We document substantial variation in the magnitude and seasonality of GPP and ER across 222 US rivers. In contrast to their terrestrial counterparts, most river ecosystems respire far more carbon than they fix and have less pronounced and consistent seasonality in their metabolic rates. We find that variation in annual solar energy inputs and stability of flows are the primary drivers of GPP and ER across rivers. A classification schema based on these drivers advances river science and informs management.

KW - Flow regimes

KW - Light regimes

KW - Metabolism

KW - River ecosystems

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Light and flow regimes regulate the metabolism of rivers

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