Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon
Aquatic habitats are severely threatened by human activities. For anadromous species, managing freshwater habitats to maximise production of more, larger juveniles could improve resilience to threats in marine habitats and enhance population viability. In some juvenile salmonid habitats, complexity...
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ftzenodo:oai:zenodo.org:5058053 2024-09-15T17:56:18+00:00 Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon Marsh, Jessica E. Lauridsen, Rasmus B. Gregory, Stephen D. Kratina, Pavel Scott, Luke J. Cooling, Dave Jones, J. Iwan 2021-07-01 https://doi.org/10.5061/dryad.612jm643t unknown Zenodo https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.612jm643t oai:zenodo.org:5058053 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode info:eu-repo/semantics/other 2021 ftzenodo https://doi.org/10.5061/dryad.612jm643t 2024-07-26T21:47:32Z Aquatic habitats are severely threatened by human activities. For anadromous species, managing freshwater habitats to maximise production of more, larger juveniles could improve resilience to threats in marine habitats and enhance population viability. In some juvenile salmonid habitats, complexity created by large substrates provides resources and reduces competitive interactions, thereby promoting juvenile production. In lowland rivers, which lack large substrates, aquatic plants might provide similar complexity and enhance fish productivity. To test the influence of aquatic plants on juvenile Atlantic salmon and sympatric brown trout in a lowland river, we directly manipulated cover of the dominant macrophyte, Ranunculus , in nine sites during summer and autumn for two years. We quantified the abundance, site retention and growth of salmon and trout under high, medium and low Ranunculus cover. To investigate the effects of Ranunculus cover on feeding opportunities and interspecific competition, we quantified available prey biomass and body size, fish diet composition, and compared dietary niche overlap. Experimentally increased Ranunculus cover supported higher salmon abundance in summer and autumn, and higher site retention and growth of salmon in summer. Trout abundance and growth were not influenced by Ranunculus cover, but trout site retention doubled in high relative to low cover sites. Despite weak effects of Ranunculus cover on prey availability, salmon and trout inhabiting high cover sites consumed larger prey and a higher biomass of prey. Furthermore, dietary niche overlap was lower in high relative to low cover sites, suggesting that abundant Ranunculus reduced interspecific competition. This field experiment shows that high Ranunculus cover can support more and better growing juvenile salmon, and facilitate foraging and co-existence of sympatric salmonid species. Maintaining or enhancing natural macrophyte cover can be achieved through sympathetic in-river and riparian vegetation management and ... Other/Unknown Material Atlantic salmon Zenodo |
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Aquatic habitats are severely threatened by human activities. For anadromous species, managing freshwater habitats to maximise production of more, larger juveniles could improve resilience to threats in marine habitats and enhance population viability. In some juvenile salmonid habitats, complexity created by large substrates provides resources and reduces competitive interactions, thereby promoting juvenile production. In lowland rivers, which lack large substrates, aquatic plants might provide similar complexity and enhance fish productivity. To test the influence of aquatic plants on juvenile Atlantic salmon and sympatric brown trout in a lowland river, we directly manipulated cover of the dominant macrophyte, Ranunculus , in nine sites during summer and autumn for two years. We quantified the abundance, site retention and growth of salmon and trout under high, medium and low Ranunculus cover. To investigate the effects of Ranunculus cover on feeding opportunities and interspecific competition, we quantified available prey biomass and body size, fish diet composition, and compared dietary niche overlap. Experimentally increased Ranunculus cover supported higher salmon abundance in summer and autumn, and higher site retention and growth of salmon in summer. Trout abundance and growth were not influenced by Ranunculus cover, but trout site retention doubled in high relative to low cover sites. Despite weak effects of Ranunculus cover on prey availability, salmon and trout inhabiting high cover sites consumed larger prey and a higher biomass of prey. Furthermore, dietary niche overlap was lower in high relative to low cover sites, suggesting that abundant Ranunculus reduced interspecific competition. This field experiment shows that high Ranunculus cover can support more and better growing juvenile salmon, and facilitate foraging and co-existence of sympatric salmonid species. Maintaining or enhancing natural macrophyte cover can be achieved through sympathetic in-river and riparian vegetation management and ... |
format |
Other/Unknown Material |
author |
Marsh, Jessica E. Lauridsen, Rasmus B. Gregory, Stephen D. Kratina, Pavel Scott, Luke J. Cooling, Dave Jones, J. Iwan |
spellingShingle |
Marsh, Jessica E. Lauridsen, Rasmus B. Gregory, Stephen D. Kratina, Pavel Scott, Luke J. Cooling, Dave Jones, J. Iwan Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon |
author_facet |
Marsh, Jessica E. Lauridsen, Rasmus B. Gregory, Stephen D. Kratina, Pavel Scott, Luke J. Cooling, Dave Jones, J. Iwan |
author_sort |
Marsh, Jessica E. |
title |
Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon |
title_short |
Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon |
title_full |
Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon |
title_fullStr |
Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon |
title_full_unstemmed |
Data from: High summer macrophyte cover increases abundance, growth and feeding of juvenile Atlantic salmon |
title_sort |
data from: high summer macrophyte cover increases abundance, growth and feeding of juvenile atlantic salmon |
publisher |
Zenodo |
publishDate |
2021 |
url |
https://doi.org/10.5061/dryad.612jm643t |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_relation |
https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.612jm643t oai:zenodo.org:5058053 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.612jm643t |
_version_ |
1810432509384589312 |