Environmental controls on benthic food web functions and carbon resource use in subarctic lakes
Climate warming and consequent greening of subarctic landscapes increase the availability of organic carbon to the detrital food webs in aquatic ecosystems. This may cause important shifts in ecosystem functioning through the functional feeding patterns of benthic organisms that rely differently on...
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Online Access: | http://hdl.handle.net/10138/326140 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/326140 2024-01-07T09:46:54+01:00 Environmental controls on benthic food web functions and carbon resource use in subarctic lakes Kivilä, E. Henriikka Luoto, Tomi P. Rantala, Marttiina V. Kiljunen, Mikko Rautio, Milla Nevalainen, Liisa Ecosystems and Environment Research Programme Faculty of Biological and Environmental Sciences 2021-02-08T12:27:01Z 16 application/pdf http://hdl.handle.net/10138/326140 eng eng Wiley 10.1111/fwb.13250 Doctoral Programme of Biological and Environmental Science of University of Jyvaskyla Graduate School for Doctoral Studies, Academy of Finland VIOLET Project, Grant/Award Number: 287547; Emil Aaltonen Foundation, Grant/Award Number: 160156 and 170161; Natural Sciences and Engineering Research Council of Canada Kivilä , E H , Luoto , T P , Rantala , M V , Kiljunen , M , Rautio , M & Nevalainen , L 2019 , ' Environmental controls on benthic food web functions and carbon resource use in subarctic lakes ' , Freshwater Biology , vol. 64 , no. 4 , pp. 643-658 . https://doi.org/10.1111/fwb.13250 ORCID: /0000-0001-6925-3688/work/56157947 ORCID: /0000-0002-3231-5926/work/56161915 ORCID: /0000-0001-6837-8753/work/56162386 85060028981 a71e89e8-7302-4b4f-8463-26ac186bc599 http://hdl.handle.net/10138/326140 000461212700003 openAccess info:eu-repo/semantics/openAccess Chironomidae functional ecology organic carbon paleolimnology stable isotopes TERRESTRIAL ORGANIC-MATTER STABLE-ISOTOPE RATIOS FRESH-WATER TROPHIC FRACTIONATION NITROGEN ENRICHMENT DELTA-N-15 INVERTEBRATES ZOOPLANKTON DELTA-C-13 1172 Environmental sciences 1181 Ecology evolutionary biology Article acceptedVersion 2021 ftunivhelsihelda 2023-12-14T00:11:31Z Climate warming and consequent greening of subarctic landscapes increase the availability of organic carbon to the detrital food webs in aquatic ecosystems. This may cause important shifts in ecosystem functioning through the functional feeding patterns of benthic organisms that rely differently on climatically altered carbon resources. Twenty-five subarctic lakes in Finnish Lapland across a tree line ecotone were analysed for limnological and optical variables, carbon (delta C-13) and nitrogen (delta N-15) stable isotope (SI) composition of surface sediment organic matter (OM) and fossil Chironomidae (Diptera) remains to examine environmental controls behind chironomid functional feeding group (FFG) structure and their isotopic associations for assessing ecosystem functioning and carbon utilisation. We hypothesise that the chironomid SI signatures reflect increased allochthony with increasing allochthonous input, but the resource use may be altered by the functional characteristics of the assemblage. Multivariate analyses indicated that carbon geochemistry in the sediments (delta C-13, delta N-15, C/N), nutrients, indices of productivity (chlorophyll-a) and lake water optical properties, related to increasing presence of OM, played a key role in defining the chironomid FFG composition and isotopic signatures. Response modelling was used to examine how individual FFGs respond to environmental gradients. They showed divergent responses for OM quantity, dissolved organic carbon and nutrients between feeding strategies, suggesting that detritivores and filter feeders prefer contrasting carbon and nutrient conditions, and may thus hold paleoecological indicator potential to identify changes between different carbon fluxes. Benthic production was the primary carbon source for the chironomid assemblages according to a three-source SI mixing model, whereas pelagic and terrestrial components contributed less. Between-lake variability in source utilisation was high and controlled primarily by allochthonous OM inputs. ... Article in Journal/Newspaper Subarctic Lapland HELDA – University of Helsinki Open Repository Freshwater Biology 64 4 643 658 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Chironomidae functional ecology organic carbon paleolimnology stable isotopes TERRESTRIAL ORGANIC-MATTER STABLE-ISOTOPE RATIOS FRESH-WATER TROPHIC FRACTIONATION NITROGEN ENRICHMENT DELTA-N-15 INVERTEBRATES ZOOPLANKTON DELTA-C-13 1172 Environmental sciences 1181 Ecology evolutionary biology |
spellingShingle |
Chironomidae functional ecology organic carbon paleolimnology stable isotopes TERRESTRIAL ORGANIC-MATTER STABLE-ISOTOPE RATIOS FRESH-WATER TROPHIC FRACTIONATION NITROGEN ENRICHMENT DELTA-N-15 INVERTEBRATES ZOOPLANKTON DELTA-C-13 1172 Environmental sciences 1181 Ecology evolutionary biology Kivilä, E. Henriikka Luoto, Tomi P. Rantala, Marttiina V. Kiljunen, Mikko Rautio, Milla Nevalainen, Liisa Environmental controls on benthic food web functions and carbon resource use in subarctic lakes |
topic_facet |
Chironomidae functional ecology organic carbon paleolimnology stable isotopes TERRESTRIAL ORGANIC-MATTER STABLE-ISOTOPE RATIOS FRESH-WATER TROPHIC FRACTIONATION NITROGEN ENRICHMENT DELTA-N-15 INVERTEBRATES ZOOPLANKTON DELTA-C-13 1172 Environmental sciences 1181 Ecology evolutionary biology |
description |
Climate warming and consequent greening of subarctic landscapes increase the availability of organic carbon to the detrital food webs in aquatic ecosystems. This may cause important shifts in ecosystem functioning through the functional feeding patterns of benthic organisms that rely differently on climatically altered carbon resources. Twenty-five subarctic lakes in Finnish Lapland across a tree line ecotone were analysed for limnological and optical variables, carbon (delta C-13) and nitrogen (delta N-15) stable isotope (SI) composition of surface sediment organic matter (OM) and fossil Chironomidae (Diptera) remains to examine environmental controls behind chironomid functional feeding group (FFG) structure and their isotopic associations for assessing ecosystem functioning and carbon utilisation. We hypothesise that the chironomid SI signatures reflect increased allochthony with increasing allochthonous input, but the resource use may be altered by the functional characteristics of the assemblage. Multivariate analyses indicated that carbon geochemistry in the sediments (delta C-13, delta N-15, C/N), nutrients, indices of productivity (chlorophyll-a) and lake water optical properties, related to increasing presence of OM, played a key role in defining the chironomid FFG composition and isotopic signatures. Response modelling was used to examine how individual FFGs respond to environmental gradients. They showed divergent responses for OM quantity, dissolved organic carbon and nutrients between feeding strategies, suggesting that detritivores and filter feeders prefer contrasting carbon and nutrient conditions, and may thus hold paleoecological indicator potential to identify changes between different carbon fluxes. Benthic production was the primary carbon source for the chironomid assemblages according to a three-source SI mixing model, whereas pelagic and terrestrial components contributed less. Between-lake variability in source utilisation was high and controlled primarily by allochthonous OM inputs. ... |
author2 |
Ecosystems and Environment Research Programme Faculty of Biological and Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Kivilä, E. Henriikka Luoto, Tomi P. Rantala, Marttiina V. Kiljunen, Mikko Rautio, Milla Nevalainen, Liisa |
author_facet |
Kivilä, E. Henriikka Luoto, Tomi P. Rantala, Marttiina V. Kiljunen, Mikko Rautio, Milla Nevalainen, Liisa |
author_sort |
Kivilä, E. Henriikka |
title |
Environmental controls on benthic food web functions and carbon resource use in subarctic lakes |
title_short |
Environmental controls on benthic food web functions and carbon resource use in subarctic lakes |
title_full |
Environmental controls on benthic food web functions and carbon resource use in subarctic lakes |
title_fullStr |
Environmental controls on benthic food web functions and carbon resource use in subarctic lakes |
title_full_unstemmed |
Environmental controls on benthic food web functions and carbon resource use in subarctic lakes |
title_sort |
environmental controls on benthic food web functions and carbon resource use in subarctic lakes |
publisher |
Wiley |
publishDate |
2021 |
url |
http://hdl.handle.net/10138/326140 |
genre |
Subarctic Lapland |
genre_facet |
Subarctic Lapland |
op_relation |
10.1111/fwb.13250 Doctoral Programme of Biological and Environmental Science of University of Jyvaskyla Graduate School for Doctoral Studies, Academy of Finland VIOLET Project, Grant/Award Number: 287547; Emil Aaltonen Foundation, Grant/Award Number: 160156 and 170161; Natural Sciences and Engineering Research Council of Canada Kivilä , E H , Luoto , T P , Rantala , M V , Kiljunen , M , Rautio , M & Nevalainen , L 2019 , ' Environmental controls on benthic food web functions and carbon resource use in subarctic lakes ' , Freshwater Biology , vol. 64 , no. 4 , pp. 643-658 . https://doi.org/10.1111/fwb.13250 ORCID: /0000-0001-6925-3688/work/56157947 ORCID: /0000-0002-3231-5926/work/56161915 ORCID: /0000-0001-6837-8753/work/56162386 85060028981 a71e89e8-7302-4b4f-8463-26ac186bc599 http://hdl.handle.net/10138/326140 000461212700003 |
op_rights |
openAccess info:eu-repo/semantics/openAccess |
container_title |
Freshwater Biology |
container_volume |
64 |
container_issue |
4 |
container_start_page |
643 |
op_container_end_page |
658 |
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1787428820163231744 |