Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology
Climate change contributes directly or indirectly to changes in species distributions, and there is very high confidence that recent climate warming is already affecting ecosystems. The Arctic has already experienced the greatest regional warming in recent decades, and the trend is continuing. Howev...
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Helsingin yliopisto
2010
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/22411 2023-08-20T04:05:02+02:00 Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology Surviaissääskien (Diptera, Chironomidae) jakautuminen Suomen subarktisissa järvissä, ja niiden käytön soveltaminen järvien luokittelussa ja paleolimnologiassa Nyman, Marjut Cwynar, Les University of Helsinki, Faculty of Biosciences, Department of Biological and Environmental Sciences Helsingin yliopisto, biotieteellinen tiedekunta, bio- ja ympäristötieteiden laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för bio- och miljövetenskaper Korhola, Atte Brooks, Stephen 2010-11-25T13:26:00Z application/pdf http://hdl.handle.net/10138/22411 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-10-3874-7 Yliopistopaino: 2007, Kilpisjärvi Notes. 0358-3279 http://hdl.handle.net/10138/22411 URN:ISBN:978-952-10-3875-4 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. akvaattiset tieteet Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:16:01Z Climate change contributes directly or indirectly to changes in species distributions, and there is very high confidence that recent climate warming is already affecting ecosystems. The Arctic has already experienced the greatest regional warming in recent decades, and the trend is continuing. However, studies on the northern ecosystems are scarce compared to more southerly regions. Better understanding of the past and present environmental change is needed to be able to forecast the future. Multivariate methods were used to explore the distributional patterns of chironomids in 50 shallow (≤ 10m) lakes in relation to 24 variables determined in northern Fennoscandia at the ecotonal area from the boreal forest in the south to the orohemiarctic zone in the north. Highest taxon richness was noted at middle elevations around 400 m a.s.l. Significantly lower values were observed from cold lakes situated in the tundra zone. Lake water alkalinity had the strongest positive correlation with the taxon richness. Many taxa had preference for lakes either on tundra area or forested area. The variation in the chironomid abundance data was best correlated with sediment organic content (LOI), lake water total organic carbon content, pH and air temperature, with LOI being the strongest variable. Three major lake groups were separated on the basis of their chironomid assemblages: (i) small and shallow organic-rich lakes, (ii) large and base-rich lakes, and (iii) cold and clear oligotrophic tundra lakes. Environmental variables best discriminating the lake groups were LOI, taxon richness, and Mg. When repeated, this kind of an approach could be useful and efficient in monitoring the effects of global change on species ranges. Many species of fast spreading insects, including chironomids, show a remarkable ability to track environmental changes. Based on this ability, past environmental conditions have been reconstructed using their chitinous remains in the lake sediment profiles. In order to study the Holocene environmental ... Doctoral or Postdoctoral Thesis Arctic Climate change Fennoscandia Subarctic Tundra Lapland Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Arctic |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
akvaattiset tieteet |
spellingShingle |
akvaattiset tieteet Nyman, Marjut Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology |
topic_facet |
akvaattiset tieteet |
description |
Climate change contributes directly or indirectly to changes in species distributions, and there is very high confidence that recent climate warming is already affecting ecosystems. The Arctic has already experienced the greatest regional warming in recent decades, and the trend is continuing. However, studies on the northern ecosystems are scarce compared to more southerly regions. Better understanding of the past and present environmental change is needed to be able to forecast the future. Multivariate methods were used to explore the distributional patterns of chironomids in 50 shallow (≤ 10m) lakes in relation to 24 variables determined in northern Fennoscandia at the ecotonal area from the boreal forest in the south to the orohemiarctic zone in the north. Highest taxon richness was noted at middle elevations around 400 m a.s.l. Significantly lower values were observed from cold lakes situated in the tundra zone. Lake water alkalinity had the strongest positive correlation with the taxon richness. Many taxa had preference for lakes either on tundra area or forested area. The variation in the chironomid abundance data was best correlated with sediment organic content (LOI), lake water total organic carbon content, pH and air temperature, with LOI being the strongest variable. Three major lake groups were separated on the basis of their chironomid assemblages: (i) small and shallow organic-rich lakes, (ii) large and base-rich lakes, and (iii) cold and clear oligotrophic tundra lakes. Environmental variables best discriminating the lake groups were LOI, taxon richness, and Mg. When repeated, this kind of an approach could be useful and efficient in monitoring the effects of global change on species ranges. Many species of fast spreading insects, including chironomids, show a remarkable ability to track environmental changes. Based on this ability, past environmental conditions have been reconstructed using their chitinous remains in the lake sediment profiles. In order to study the Holocene environmental ... |
author2 |
Cwynar, Les University of Helsinki, Faculty of Biosciences, Department of Biological and Environmental Sciences Helsingin yliopisto, biotieteellinen tiedekunta, bio- ja ympäristötieteiden laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för bio- och miljövetenskaper Korhola, Atte Brooks, Stephen |
format |
Doctoral or Postdoctoral Thesis |
author |
Nyman, Marjut |
author_facet |
Nyman, Marjut |
author_sort |
Nyman, Marjut |
title |
Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology |
title_short |
Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology |
title_full |
Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology |
title_fullStr |
Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology |
title_full_unstemmed |
Distribution of non-biting midges (Diptera, Chironomidae) in subarctic lakes of Finnish Lapland applications in lake classification and palaeolimnology |
title_sort |
distribution of non-biting midges (diptera, chironomidae) in subarctic lakes of finnish lapland applications in lake classification and palaeolimnology |
publisher |
Helsingin yliopisto |
publishDate |
2010 |
url |
http://hdl.handle.net/10138/22411 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Fennoscandia Subarctic Tundra Lapland |
genre_facet |
Arctic Climate change Fennoscandia Subarctic Tundra Lapland |
op_relation |
URN:ISBN:978-952-10-3874-7 Yliopistopaino: 2007, Kilpisjärvi Notes. 0358-3279 http://hdl.handle.net/10138/22411 URN:ISBN:978-952-10-3875-4 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774715456399081472 |