Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene
Past episodes of birch hybridization in Iceland were studied by pollen analysis. The low stature and polycormic form of downy birch Betula pubescens in the subarctic probably results from such hybridization with the dwarf birch Betula nana. Two previous studies in different regions in Iceland reveal...
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Online Access: | http://hdl.handle.net/1946/19878 |
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ftskemman:oai:skemman.is:1946/19878 2023-05-15T15:44:29+02:00 Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene Kynblöndun ilmbjarkar og fjalldrapa í Þistilfirði á Nútíma Lilja Karlsdóttir 1952- Margrét Hallsdóttir 1949- Ólafur Eggertsson 1964- Ægir Þór Þórsson 1970- Kesara Margrét Jónsson 1951- Landbúnaðarháskóli Íslands 2014 application/pdf http://hdl.handle.net/1946/19878 en eng http://www.ias.is/landbunadur/wgsamvef.nsf/Attachment/IAS%20-%208%20kafli%20Lilja/$file/IAS%20-%208%20kafli%20Lilja.pdf Icelandic agricultural sciences 27, 95-109 1670-567x http://hdl.handle.net/1946/19878 Birki Fjalldrapi Article 2014 ftskemman 2022-12-11T06:57:10Z Past episodes of birch hybridization in Iceland were studied by pollen analysis. The low stature and polycormic form of downy birch Betula pubescens in the subarctic probably results from such hybridization with the dwarf birch Betula nana. Two previous studies in different regions in Iceland revealed events of hybridization connected to early B. pubescens expansion. The present study examined a peat monolith from Thistilfjördur, North-east Iceland, covering the last ten thousand years. Betula pollen was measured, proportions of B. nana and B. pubescens calculated and the presence of hybrids estimated. Betula pubescens expansion started around 7.2 cal ka BP with a peak in non-triporate pollen, indicating hybrids. Low Betula pollen concentrations followed. A second period of considerable hybridization is indicated around 3.3 cal ka BP. Both peaks were associated with B. pubescens expansion. Tegundablöndun ilmbjarkar og fjalldrapa var rannsökuð í frjókornum. Lágar og margstofna ilmbjarkir á norðlægum slóðum eru líklega afleiðing slíkrar blöndunar. Tvær eldri rannsóknir frá mismunandi landshlutum sýndu hrinur blöndunar snemma á Nútíma sem tengdust framrás ilmbjarkar. Í þessari rannsókn voru sýni tekin úr mósniði í Þistilfirði, sem spannar síðustu tíu þúsund ár. Birkifrjókorn voru mæld, hlutföll tegundanna reiknuð og leitað ummerkja um blöndunina. Ilmbjörk tók að breiðast út fyrir um 7200 árum og fram kom toppur afbrigðilegra frjókorna sem gefa til kynna fjölda blendingstrjáa. Tímabil með litlu birki fylgdi í kjölfarið en önnur hrina erfðablöndunar varð fyrir um 3300 árum. Báðar hrinurnar tengdust aukinni útbreiðslu ilmbjarkar. Article in Journal/Newspaper Betula nana Dwarf birch Fjalldrapi Iceland Subarctic Skemman (Iceland) Lágar ENVELOPE(-20.137,-20.137,63.695,63.695) Monolith ENVELOPE(163.283,163.283,-66.950,-66.950) |
institution |
Open Polar |
collection |
Skemman (Iceland) |
op_collection_id |
ftskemman |
language |
English |
topic |
Birki Fjalldrapi |
spellingShingle |
Birki Fjalldrapi Lilja Karlsdóttir 1952- Margrét Hallsdóttir 1949- Ólafur Eggertsson 1964- Ægir Þór Þórsson 1970- Kesara Margrét Jónsson 1951- Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene |
topic_facet |
Birki Fjalldrapi |
description |
Past episodes of birch hybridization in Iceland were studied by pollen analysis. The low stature and polycormic form of downy birch Betula pubescens in the subarctic probably results from such hybridization with the dwarf birch Betula nana. Two previous studies in different regions in Iceland revealed events of hybridization connected to early B. pubescens expansion. The present study examined a peat monolith from Thistilfjördur, North-east Iceland, covering the last ten thousand years. Betula pollen was measured, proportions of B. nana and B. pubescens calculated and the presence of hybrids estimated. Betula pubescens expansion started around 7.2 cal ka BP with a peak in non-triporate pollen, indicating hybrids. Low Betula pollen concentrations followed. A second period of considerable hybridization is indicated around 3.3 cal ka BP. Both peaks were associated with B. pubescens expansion. Tegundablöndun ilmbjarkar og fjalldrapa var rannsökuð í frjókornum. Lágar og margstofna ilmbjarkir á norðlægum slóðum eru líklega afleiðing slíkrar blöndunar. Tvær eldri rannsóknir frá mismunandi landshlutum sýndu hrinur blöndunar snemma á Nútíma sem tengdust framrás ilmbjarkar. Í þessari rannsókn voru sýni tekin úr mósniði í Þistilfirði, sem spannar síðustu tíu þúsund ár. Birkifrjókorn voru mæld, hlutföll tegundanna reiknuð og leitað ummerkja um blöndunina. Ilmbjörk tók að breiðast út fyrir um 7200 árum og fram kom toppur afbrigðilegra frjókorna sem gefa til kynna fjölda blendingstrjáa. Tímabil með litlu birki fylgdi í kjölfarið en önnur hrina erfðablöndunar varð fyrir um 3300 árum. Báðar hrinurnar tengdust aukinni útbreiðslu ilmbjarkar. |
author2 |
Landbúnaðarháskóli Íslands |
format |
Article in Journal/Newspaper |
author |
Lilja Karlsdóttir 1952- Margrét Hallsdóttir 1949- Ólafur Eggertsson 1964- Ægir Þór Þórsson 1970- Kesara Margrét Jónsson 1951- |
author_facet |
Lilja Karlsdóttir 1952- Margrét Hallsdóttir 1949- Ólafur Eggertsson 1964- Ægir Þór Þórsson 1970- Kesara Margrét Jónsson 1951- |
author_sort |
Lilja Karlsdóttir 1952- |
title |
Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene |
title_short |
Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene |
title_full |
Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene |
title_fullStr |
Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene |
title_full_unstemmed |
Birch hybridization in Thistilfjördur, North-east Iceland during the Holocene |
title_sort |
birch hybridization in thistilfjördur, north-east iceland during the holocene |
publishDate |
2014 |
url |
http://hdl.handle.net/1946/19878 |
long_lat |
ENVELOPE(-20.137,-20.137,63.695,63.695) ENVELOPE(163.283,163.283,-66.950,-66.950) |
geographic |
Lágar Monolith |
geographic_facet |
Lágar Monolith |
genre |
Betula nana Dwarf birch Fjalldrapi Iceland Subarctic |
genre_facet |
Betula nana Dwarf birch Fjalldrapi Iceland Subarctic |
op_relation |
http://www.ias.is/landbunadur/wgsamvef.nsf/Attachment/IAS%20-%208%20kafli%20Lilja/$file/IAS%20-%208%20kafli%20Lilja.pdf Icelandic agricultural sciences 27, 95-109 1670-567x http://hdl.handle.net/1946/19878 |
_version_ |
1766378861680918528 |