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Prior selection prevents the loss of an ecosystem cycle during acidification

View ORCID ProfileSofia J. van Moorsel, View ORCID ProfileJustin N. Marleau, Jorge O. Negrín Dastis, Charles Bazerghi, View ORCID ProfileVincent Fugère, View ORCID ProfileOwen L. Petchey, Andrew Gonzalez
doi: https://doi.org/10.1101/2020.01.27.921437
Sofia J. van Moorsel
1Department of Biology, Quebec Centre for Biodiversity Science, McGill University, Montreal, QC, Canada
2URPP Global Change and Biodiversity, University of Zurich, Switzerland
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  • ORCID record for Sofia J. van Moorsel
  • For correspondence: sofia.vanmoorsel@mail.mcgill.ca andrew.gonzalez@mgcill.ca
Justin N. Marleau
1Department of Biology, Quebec Centre for Biodiversity Science, McGill University, Montreal, QC, Canada
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Jorge O. Negrín Dastis
1Department of Biology, Quebec Centre for Biodiversity Science, McGill University, Montreal, QC, Canada
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Charles Bazerghi
1Department of Biology, Quebec Centre for Biodiversity Science, McGill University, Montreal, QC, Canada
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Vincent Fugère
1Department of Biology, Quebec Centre for Biodiversity Science, McGill University, Montreal, QC, Canada
3Department of Biology, Université de Quebec à Montreal (UQAM), Montreal, QC, Canada
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Owen L. Petchey
2URPP Global Change and Biodiversity, University of Zurich, Switzerland
4Department of Evolutionary Biology and Environmental Sciences, University of Zurich, Switzerland
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Andrew Gonzalez
1Department of Biology, Quebec Centre for Biodiversity Science, McGill University, Montreal, QC, Canada
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  • For correspondence: sofia.vanmoorsel@mail.mcgill.ca andrew.gonzalez@mgcill.ca
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Abstract

Ecosystem processes vary temporally due to variation in environmental variables, such as when diurnal variation in sunlight causes diurnal cycles in net primary production. This variability can be characterized by its frequency and amplitude, used to define “normal” functioning of an ecosystem. Relatively little research has addressed how normal modes of variability, such as diurnal cycles, are lost or recovered, following anthropogenic stress. We conducted an aquatic mesocosm experiment to test whether prior application of environmental stress, in the form of moderate acidification, affected the diurnal cycle of dissolved oxygen when exposed to severe acidification. High-frequency data from sensor loggers deployed in 12 mesocosms showed that severe acidification caused a temporary loss of diurnal variation in dissolved oxygen concentration. However, pre-exposure to an acidic environment resulted in the persistence of the diurnal cycle. We hypothesize that pre-exposure shifted the community to acid tolerant genotypes and/or species of algae and other photosynthetic organisms. Our findings suggest that the stability of ecosystem cycles is intrinsically liked to the stress tolerance of the species assemblage.

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Posted January 28, 2020.
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Prior selection prevents the loss of an ecosystem cycle during acidification
Sofia J. van Moorsel, Justin N. Marleau, Jorge O. Negrín Dastis, Charles Bazerghi, Vincent Fugère, Owen L. Petchey, Andrew Gonzalez
bioRxiv 2020.01.27.921437; doi: https://doi.org/10.1101/2020.01.27.921437
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Prior selection prevents the loss of an ecosystem cycle during acidification
Sofia J. van Moorsel, Justin N. Marleau, Jorge O. Negrín Dastis, Charles Bazerghi, Vincent Fugère, Owen L. Petchey, Andrew Gonzalez
bioRxiv 2020.01.27.921437; doi: https://doi.org/10.1101/2020.01.27.921437

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