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From organismal physiology to ecological processes: Effects of nutrient enrichment and salinity variation in a freshwater ecosystem.

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Title: From organismal physiology to ecological processes: Effects of nutrient enrichment and salinity variation in a freshwater ecosystem.
Authors: Carrier‐Belleau, Charlotte1,2,3 (AUTHOR) charlotte.carrier-belleau.1@ulaval.ca, Pascal, Ludovic2,4 (AUTHOR), Tiegs, Scott D.5 (AUTHOR), Nozais, Christian2,6 (AUTHOR), Archambault, Philippe1,2,3 (AUTHOR)
Source: Limnology & Oceanography. Jun2023 Supplement 1, Vol. 68, pS115-S130. 16p.
Subjects: Ecophysiology, Zebra mussel, Fresh water, Strains & stresses (Mechanics), Ecosystems, Salinity
Abstract: Environmental stressors have profound implications for species, communities, and ecosystems by altering fundamental processes. With increasing human impacts on aquatic ecosystems, two main scenarios have been reported: (1) the spatiotemporal superposition of multiple stressors, leading to interactions among them and (2) intensifying environmental gradients, leading to threshold responses. However, studies designed to assess the effects of multiple stressors (e.g., pulse stressors) along environmental gradients (e.g., press stressors) are uncommon, and interactions between pulse and press stressors may cause abrupt changes in biological responses. We conducted a laboratory experiment to investigate the effects of osmotic stress along a nutrient enrichment gradient on a freshwater community composed of periphyton, microorganisms, and zebra mussels (Dreissena polymorpha). Our objectives were to (1) quantify the individual and combined effects of stressors, (2) delineate thresholds along the nutrient gradient (press) in the absence and presence of osmotic stress (pulse), and (3) test for interactions between the two stressors. We evaluated effects on metabolic rates in D. polymorpha and on microbial activity, as well as phototrophic periphyton biomass and physiological status. We observed interactions between the two stressors for metabolic rates in D. polymorpha and periphytic phaeopigments. In contrast, we found an individual effect of osmotic stress on microbial activity and chlorophyll a content. Thresholds were only identified in the presence of osmotic stress for metabolic rates in D. polymorpha. Our work highlights the importance of combining multiple stressors with environmental gradients and the need to consider multiple biological compartments when evaluating the impacts of stressors on ecosystems. [ABSTRACT FROM AUTHOR]
Copyright of Limnology & Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: From organismal physiology to ecological processes: Effects of nutrient enrichment and salinity variation in a freshwater ecosystem.
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  Data: <searchLink fieldCode="JN" term="%22Limnology+%26+Oceanography%22">Limnology & Oceanography</searchLink>. Jun2023 Supplement 1, Vol. 68, pS115-S130. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Ecophysiology%22">Ecophysiology</searchLink><br /><searchLink fieldCode="DE" term="%22Zebra+mussel%22">Zebra mussel</searchLink><br /><searchLink fieldCode="DE" term="%22Fresh+water%22">Fresh water</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Ecosystems%22">Ecosystems</searchLink><br /><searchLink fieldCode="DE" term="%22Salinity%22">Salinity</searchLink>
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  Data: Environmental stressors have profound implications for species, communities, and ecosystems by altering fundamental processes. With increasing human impacts on aquatic ecosystems, two main scenarios have been reported: (1) the spatiotemporal superposition of multiple stressors, leading to interactions among them and (2) intensifying environmental gradients, leading to threshold responses. However, studies designed to assess the effects of multiple stressors (e.g., pulse stressors) along environmental gradients (e.g., press stressors) are uncommon, and interactions between pulse and press stressors may cause abrupt changes in biological responses. We conducted a laboratory experiment to investigate the effects of osmotic stress along a nutrient enrichment gradient on a freshwater community composed of periphyton, microorganisms, and zebra mussels (Dreissena polymorpha). Our objectives were to (1) quantify the individual and combined effects of stressors, (2) delineate thresholds along the nutrient gradient (press) in the absence and presence of osmotic stress (pulse), and (3) test for interactions between the two stressors. We evaluated effects on metabolic rates in D. polymorpha and on microbial activity, as well as phototrophic periphyton biomass and physiological status. We observed interactions between the two stressors for metabolic rates in D. polymorpha and periphytic phaeopigments. In contrast, we found an individual effect of osmotic stress on microbial activity and chlorophyll a content. Thresholds were only identified in the presence of osmotic stress for metabolic rates in D. polymorpha. Our work highlights the importance of combining multiple stressors with environmental gradients and the need to consider multiple biological compartments when evaluating the impacts of stressors on ecosystems. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Limnology & Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1002/lno.12269
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: S115
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        Type: general
      – SubjectFull: Zebra mussel
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      – SubjectFull: Fresh water
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      – SubjectFull: Strains & stresses (Mechanics)
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      – SubjectFull: Ecosystems
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      – SubjectFull: Salinity
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    Titles:
      – TitleFull: From organismal physiology to ecological processes: Effects of nutrient enrichment and salinity variation in a freshwater ecosystem.
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            NameFull: Carrier‐Belleau, Charlotte
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            NameFull: Pascal, Ludovic
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              Text: Jun2023 Supplement 1
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              Y: 2023
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