Invertebrate diversity in Icelandic freshwater springs
Freshwater springs are thermally stable environments which are largely unaffected by changes in air temperature. They could thus have the potential to buffer rising temperatures and serve as small-scale refugia for aquatic invertebrates in a warming world. To better understand what environmental var...
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University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences
2020
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ftopinvisindi:oai:opinvisindi.is:20.500.11815/2087 2023-05-15T14:30:12+02:00 Invertebrate diversity in Icelandic freshwater springs Kreiling, Agnes-Katharina Bjarni K. Kristjánsson Líf- og umhverfisvísindadeild (HÍ) Faculty of Life and Environmental Sciences (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland 2020-10 97 https://hdl.handle.net/20.500.11815/2087 en eng University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences Agnes-Katharina Kreiling, 2020, Invertebrate diversity in Icelandic freshwater springs, PhD dissertation, Faculty of Life and Environmental Science, University of Iceland, 97 pp. https://hdl.handle.net/20.500.11815/2087 info:eu-repo/semantics/openAccess Invertebrates Freshwater springs Hot springs Hryggleysingjar Ferskvatn Hverir Rykmý Krabbadýr Vistkerfi Líffræði Doktorsritgerðir info:eu-repo/semantics/doctoralThesis 2020 ftopinvisindi https://doi.org/20.500.11815/2087 2022-11-18T06:52:01Z Freshwater springs are thermally stable environments which are largely unaffected by changes in air temperature. They could thus have the potential to buffer rising temperatures and serve as small-scale refugia for aquatic invertebrates in a warming world. To better understand what environmental variables drive invertebrate diversity and community composition, I conducted an extensive field survey on springs in Iceland. Due to rifts in the tectonic plates, large parts of Iceland are of volcanic origin and geothermally active. Thus, a high number of freshwater springs can be found along the edges of the porous lava fields, ranging in temperature from 2°C to boiling hot. Springs also differ in other characteristics, e.g., altitude, spring type, substrate, and vegetation density. I studied the invertebrate community of 49 springs on a spatial scale and followed one of them throughout a year to analyse temporal variability. The most abundant invertebrate groups in Icelandic springs were Chironomidae (Diptera), followed by Ostracoda and Copepoda. One of the main drivers of community composition was temperature, resulting in a distinct species group characteristic for hot springs. Additionally, spring type and geographical position influenced communities. Community composition also differed on a temporal scale within the same spring, with distinctions between summer and winter community. This seasonality in the invertebrate community was unaffected by temperature changes but had implications on the apex predator in the system, Arctic charr. The results of this thesis give some insight into Icelandic spring ecosystems and will contribute to conservation of these unique habitats. Fjölbreytileiki ferskvatnslinda er mikill t.d. hvað hita varðar, allt frá því að vera mjög kaldar og sjóðandi heitar. Þrátt fyrir þennan fjölbreytileika er þó hiti í hverjum og einstökum lindum mjög stöðugur og hafa breytingar í lofthita lítil áhrif á hitastig þeirra. Lindir gætu þannig dregið úr áhrifum af hækkandi hita og þannig myndað ... Doctoral or Postdoctoral Thesis Arctic charr Arctic Iceland Opin vísindi (Iceland) Arctic |
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Open Polar |
collection |
Opin vísindi (Iceland) |
op_collection_id |
ftopinvisindi |
language |
English |
topic |
Invertebrates Freshwater springs Hot springs Hryggleysingjar Ferskvatn Hverir Rykmý Krabbadýr Vistkerfi Líffræði Doktorsritgerðir |
spellingShingle |
Invertebrates Freshwater springs Hot springs Hryggleysingjar Ferskvatn Hverir Rykmý Krabbadýr Vistkerfi Líffræði Doktorsritgerðir Kreiling, Agnes-Katharina Invertebrate diversity in Icelandic freshwater springs |
topic_facet |
Invertebrates Freshwater springs Hot springs Hryggleysingjar Ferskvatn Hverir Rykmý Krabbadýr Vistkerfi Líffræði Doktorsritgerðir |
description |
Freshwater springs are thermally stable environments which are largely unaffected by changes in air temperature. They could thus have the potential to buffer rising temperatures and serve as small-scale refugia for aquatic invertebrates in a warming world. To better understand what environmental variables drive invertebrate diversity and community composition, I conducted an extensive field survey on springs in Iceland. Due to rifts in the tectonic plates, large parts of Iceland are of volcanic origin and geothermally active. Thus, a high number of freshwater springs can be found along the edges of the porous lava fields, ranging in temperature from 2°C to boiling hot. Springs also differ in other characteristics, e.g., altitude, spring type, substrate, and vegetation density. I studied the invertebrate community of 49 springs on a spatial scale and followed one of them throughout a year to analyse temporal variability. The most abundant invertebrate groups in Icelandic springs were Chironomidae (Diptera), followed by Ostracoda and Copepoda. One of the main drivers of community composition was temperature, resulting in a distinct species group characteristic for hot springs. Additionally, spring type and geographical position influenced communities. Community composition also differed on a temporal scale within the same spring, with distinctions between summer and winter community. This seasonality in the invertebrate community was unaffected by temperature changes but had implications on the apex predator in the system, Arctic charr. The results of this thesis give some insight into Icelandic spring ecosystems and will contribute to conservation of these unique habitats. Fjölbreytileiki ferskvatnslinda er mikill t.d. hvað hita varðar, allt frá því að vera mjög kaldar og sjóðandi heitar. Þrátt fyrir þennan fjölbreytileika er þó hiti í hverjum og einstökum lindum mjög stöðugur og hafa breytingar í lofthita lítil áhrif á hitastig þeirra. Lindir gætu þannig dregið úr áhrifum af hækkandi hita og þannig myndað ... |
author2 |
Bjarni K. Kristjánsson Líf- og umhverfisvísindadeild (HÍ) Faculty of Life and Environmental Sciences (UI) Verkfræði- og náttúruvísindasvið (HÍ) School of Engineering and Natural Sciences (UI) Háskóli Íslands University of Iceland |
format |
Doctoral or Postdoctoral Thesis |
author |
Kreiling, Agnes-Katharina |
author_facet |
Kreiling, Agnes-Katharina |
author_sort |
Kreiling, Agnes-Katharina |
title |
Invertebrate diversity in Icelandic freshwater springs |
title_short |
Invertebrate diversity in Icelandic freshwater springs |
title_full |
Invertebrate diversity in Icelandic freshwater springs |
title_fullStr |
Invertebrate diversity in Icelandic freshwater springs |
title_full_unstemmed |
Invertebrate diversity in Icelandic freshwater springs |
title_sort |
invertebrate diversity in icelandic freshwater springs |
publisher |
University of Iceland, School of Engineering and Natural Sciences, Faculty of Life and Environmental Sciences |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11815/2087 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Iceland |
genre_facet |
Arctic charr Arctic Iceland |
op_relation |
Agnes-Katharina Kreiling, 2020, Invertebrate diversity in Icelandic freshwater springs, PhD dissertation, Faculty of Life and Environmental Science, University of Iceland, 97 pp. https://hdl.handle.net/20.500.11815/2087 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/20.500.11815/2087 |
_version_ |
1766304097670004736 |