Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae)
Landscape change in Europe has caused the decline of many grassland species. Tephroseris integrifolia (Asteraceae) is one species which has declined rapidly in Sweden since the 19th century. A census of extant populations from 1980 to 2009 revealed a dramatic decrease in population sizes during the...
Main Author: | |
---|---|
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
Plant Ecology and Systematics, Lund University
2009
|
Subjects: | |
Online Access: | https://lup.lub.lu.se/record/1486287 https://portal.research.lu.se/files/5811539/1486299.pdf |
id |
ftulundlup:oai:lup.lub.lu.se:ff985f8a-1f11-4721-88f4-8676f4d4ed54 |
---|---|
record_format |
openpolar |
spelling |
ftulundlup:oai:lup.lub.lu.se:ff985f8a-1f11-4721-88f4-8676f4d4ed54 2023-05-15T18:31:24+02:00 Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae) Isaksson, Kerstin 2009 application/pdf https://lup.lub.lu.se/record/1486287 https://portal.research.lu.se/files/5811539/1486299.pdf eng eng Plant Ecology and Systematics, Lund University https://lup.lub.lu.se/record/1486287 urn:isbn:978-91-7105-303-9 https://portal.research.lu.se/files/5811539/1486299.pdf info:eu-repo/semantics/openAccess Ecology quantitative genetics AFLP local genetic variation relict populations fragmentation small populations sporophytic self-incompatibility extinction threatened species Inbreeding depression population structure thesis/doccomp info:eu-repo/semantics/doctoralThesis text 2009 ftulundlup 2023-02-01T23:31:36Z Landscape change in Europe has caused the decline of many grassland species. Tephroseris integrifolia (Asteraceae) is one species which has declined rapidly in Sweden since the 19th century. A census of extant populations from 1980 to 2009 revealed a dramatic decrease in population sizes during the early 1990s, despite far-reaching conservation measures. Knowledge of causes of species decline is necessary for the elaboration of conservation programmes. In this thesis, it is investigated whether this ongoing decrease is caused by a decreased genetic variation within North European T. integrifolia populations, with the main focus on Sweden. The Swedish populations showed only weak signs of inbreeding depression, and the plants were capable of setting seeds after within-patch cross-pollination, indicating that very little genetic variation has been lost. The Swedish populations did not differ from Estonian populations in variation in AFLP markers, and there was no connection between population size and local genetic variation. When compared with British and Danish populations, heritability (i. e. quantitative expression of genetic variation) was for most characters the largest in the Swedish populations, which are the smallest and the smallest for the Estonian populations, which are the largest. Though Swedish T. integrifolia populations have not lost much genetic variation, the high heritability indicates that they might be in the early stages of a bottleneck. The ongoing decline of T. integrifolia in Sweden does probably not have genetic causes. Rather, the causes of species decline can be found in the altered dynamics of the cultural landscape. Doctoral or Postdoctoral Thesis Tephroseris integrifolia Lund University Publications (LUP) |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Ecology quantitative genetics AFLP local genetic variation relict populations fragmentation small populations sporophytic self-incompatibility extinction threatened species Inbreeding depression population structure |
spellingShingle |
Ecology quantitative genetics AFLP local genetic variation relict populations fragmentation small populations sporophytic self-incompatibility extinction threatened species Inbreeding depression population structure Isaksson, Kerstin Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae) |
topic_facet |
Ecology quantitative genetics AFLP local genetic variation relict populations fragmentation small populations sporophytic self-incompatibility extinction threatened species Inbreeding depression population structure |
description |
Landscape change in Europe has caused the decline of many grassland species. Tephroseris integrifolia (Asteraceae) is one species which has declined rapidly in Sweden since the 19th century. A census of extant populations from 1980 to 2009 revealed a dramatic decrease in population sizes during the early 1990s, despite far-reaching conservation measures. Knowledge of causes of species decline is necessary for the elaboration of conservation programmes. In this thesis, it is investigated whether this ongoing decrease is caused by a decreased genetic variation within North European T. integrifolia populations, with the main focus on Sweden. The Swedish populations showed only weak signs of inbreeding depression, and the plants were capable of setting seeds after within-patch cross-pollination, indicating that very little genetic variation has been lost. The Swedish populations did not differ from Estonian populations in variation in AFLP markers, and there was no connection between population size and local genetic variation. When compared with British and Danish populations, heritability (i. e. quantitative expression of genetic variation) was for most characters the largest in the Swedish populations, which are the smallest and the smallest for the Estonian populations, which are the largest. Though Swedish T. integrifolia populations have not lost much genetic variation, the high heritability indicates that they might be in the early stages of a bottleneck. The ongoing decline of T. integrifolia in Sweden does probably not have genetic causes. Rather, the causes of species decline can be found in the altered dynamics of the cultural landscape. |
format |
Doctoral or Postdoctoral Thesis |
author |
Isaksson, Kerstin |
author_facet |
Isaksson, Kerstin |
author_sort |
Isaksson, Kerstin |
title |
Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae) |
title_short |
Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae) |
title_full |
Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae) |
title_fullStr |
Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae) |
title_full_unstemmed |
Investigating genetic factors behind the decline of a threatened plant species – Tephroseris integrifolia (Asteraceae) |
title_sort |
investigating genetic factors behind the decline of a threatened plant species – tephroseris integrifolia (asteraceae) |
publisher |
Plant Ecology and Systematics, Lund University |
publishDate |
2009 |
url |
https://lup.lub.lu.se/record/1486287 https://portal.research.lu.se/files/5811539/1486299.pdf |
genre |
Tephroseris integrifolia |
genre_facet |
Tephroseris integrifolia |
op_relation |
https://lup.lub.lu.se/record/1486287 urn:isbn:978-91-7105-303-9 https://portal.research.lu.se/files/5811539/1486299.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766215234788261888 |