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Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management

The river continuum concept (RCC) predicts a downstream shift in the reliance of aquatic consumers from terrestrial to aquatic carbon sources, but this concept has rarely been assessed with longitudinal studies. Similarly, there are no studies addressing how forestry related disturbances to the stru...

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Autores principales: Erdozain, Maitane, Kidd, Karen A., Emilson, Erik J. S., Capell, Scott S., Kreutzweiser, David P., Gray, Michelle A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9519712/
https://www.ncbi.nlm.nih.gov/pubmed/36187364
http://dx.doi.org/10.1007/s10021-021-00717-6
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author Erdozain, Maitane
Kidd, Karen A.
Emilson, Erik J. S.
Capell, Scott S.
Kreutzweiser, David P.
Gray, Michelle A.
author_facet Erdozain, Maitane
Kidd, Karen A.
Emilson, Erik J. S.
Capell, Scott S.
Kreutzweiser, David P.
Gray, Michelle A.
author_sort Erdozain, Maitane
collection PubMed
description The river continuum concept (RCC) predicts a downstream shift in the reliance of aquatic consumers from terrestrial to aquatic carbon sources, but this concept has rarely been assessed with longitudinal studies. Similarly, there are no studies addressing how forestry related disturbances to the structure of headwater food webs manifest (accumulate/dissipate) downstream and/or whether forest management alters natural longitudinal trends predicted by the RCC. Using stable isotopes of carbon, nitrogen and hydrogen, we investigated how: 1) autochthony in macroinvertebrates and fish change from small streams to larger downstream sites within a basin with minimal forest management (New Brunswick, Canada); 2) longitudinal trends in autochthony and food web length compare among three basins with different forest management intensity [intensive (harvest and replanting), extensive (harvest only), minimal] to detect potential cumulative/dissipative effects; and 3) forest management intensity and other catchment variables are influencing food web dynamics. We showed that, as predicted, the reliance of some macroinvertebrate taxa (especially collector feeders) on algae increased from small streams to downstream waters in the minimally managed basin, but that autochthony in the smallest shaded stream was higher than expected based on the RCC (as high as 90% for some taxa). However, this longitudinal increase in autochthony was not observed within the extensively managed basin and was weaker within the intensively managed one, suggesting that forest management can alter food web dynamics along the river continuum. The dampening of downstream autochthony indicates that the increased allochthony observed in small streams in response to forest harvesting cumulates downstream through the river continuum. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10021-021-00717-6.
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spelling pubmed-95197122022-09-30 Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management Erdozain, Maitane Kidd, Karen A. Emilson, Erik J. S. Capell, Scott S. Kreutzweiser, David P. Gray, Michelle A. Ecosystems Article The river continuum concept (RCC) predicts a downstream shift in the reliance of aquatic consumers from terrestrial to aquatic carbon sources, but this concept has rarely been assessed with longitudinal studies. Similarly, there are no studies addressing how forestry related disturbances to the structure of headwater food webs manifest (accumulate/dissipate) downstream and/or whether forest management alters natural longitudinal trends predicted by the RCC. Using stable isotopes of carbon, nitrogen and hydrogen, we investigated how: 1) autochthony in macroinvertebrates and fish change from small streams to larger downstream sites within a basin with minimal forest management (New Brunswick, Canada); 2) longitudinal trends in autochthony and food web length compare among three basins with different forest management intensity [intensive (harvest and replanting), extensive (harvest only), minimal] to detect potential cumulative/dissipative effects; and 3) forest management intensity and other catchment variables are influencing food web dynamics. We showed that, as predicted, the reliance of some macroinvertebrate taxa (especially collector feeders) on algae increased from small streams to downstream waters in the minimally managed basin, but that autochthony in the smallest shaded stream was higher than expected based on the RCC (as high as 90% for some taxa). However, this longitudinal increase in autochthony was not observed within the extensively managed basin and was weaker within the intensively managed one, suggesting that forest management can alter food web dynamics along the river continuum. The dampening of downstream autochthony indicates that the increased allochthony observed in small streams in response to forest harvesting cumulates downstream through the river continuum. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10021-021-00717-6. Springer US 2021-10-22 2022 /pmc/articles/PMC9519712/ /pubmed/36187364 http://dx.doi.org/10.1007/s10021-021-00717-6 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Erdozain, Maitane
Kidd, Karen A.
Emilson, Erik J. S.
Capell, Scott S.
Kreutzweiser, David P.
Gray, Michelle A.
Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management
title Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management
title_full Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management
title_fullStr Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management
title_full_unstemmed Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management
title_short Elevated Allochthony in Stream Food Webs as a Result of Longitudinal Cumulative Effects of Forest Management
title_sort elevated allochthony in stream food webs as a result of longitudinal cumulative effects of forest management
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9519712/
https://www.ncbi.nlm.nih.gov/pubmed/36187364
http://dx.doi.org/10.1007/s10021-021-00717-6
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