Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization
The increase in thallus diameter and apothecium production, and the population size structure of the saxicolous lichens Umbilicaria cylindrica (L.) Del., Umbilicaria hyperborea (Ach.) Hoffm., Umbilicaria proboscidea (L.) Schrad, and Umbilicaria torrefacta (Lightf.) Schrad, were measured in a chronos...
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crcansciencepubl:10.1139/b04-068 2024-03-03T08:44:39+00:00 Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization Hestmark, Geir Skogesal, Olav Skullerud, Øystein 2004 http://dx.doi.org/10.1139/b04-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/b04-068 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 82, issue 9, page 1356-1362 ISSN 0008-4026 Plant Science journal-article 2004 crcansciencepubl https://doi.org/10.1139/b04-068 2024-02-07T10:53:40Z The increase in thallus diameter and apothecium production, and the population size structure of the saxicolous lichens Umbilicaria cylindrica (L.) Del., Umbilicaria hyperborea (Ach.) Hoffm., Umbilicaria proboscidea (L.) Schrad, and Umbilicaria torrefacta (Lightf.) Schrad, were measured in a chronosequence of 240 years in a glacier foreland in the alpine Jotunheimen National Park in Norway. All four species exhibited a pattern of fast growth in the early decades of their life history, followed by a rapid decrease in growth, slowly approaching a maximum body size. There were clear interspecific differences in initial estimated growth rate, growth period, and maximum size. In all species, apothecium production is strongly correlated with thallus size, but in U. hyperborea the relationship approximates an exponential function, while in the other species the trend is more linear. In U. proboscidea, the slowest to mature, a fairly high proportion of sterile individuals also occur in the higher size classes. There was no observed trade off between growth and reproduction. Quite the contrary: the species that grow faster also start to reproduce abundantly and early. The relatively slow growth and reproductive maturation of the species implies that a population of 40- to 50-year-old individual thalli is still a population consisting mainly of immigrants. The population size structure of all four species remains strongly skewed during the entire chronosequence, with a predominance of small thalli.Key words: plant life histories, lichen growth rates, size structure, Umbilicaria. Article in Journal/Newspaper glacier Canadian Science Publishing Norway Canadian Journal of Botany 82 9 1356 1362 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
Plant Science |
spellingShingle |
Plant Science Hestmark, Geir Skogesal, Olav Skullerud, Øystein Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization |
topic_facet |
Plant Science |
description |
The increase in thallus diameter and apothecium production, and the population size structure of the saxicolous lichens Umbilicaria cylindrica (L.) Del., Umbilicaria hyperborea (Ach.) Hoffm., Umbilicaria proboscidea (L.) Schrad, and Umbilicaria torrefacta (Lightf.) Schrad, were measured in a chronosequence of 240 years in a glacier foreland in the alpine Jotunheimen National Park in Norway. All four species exhibited a pattern of fast growth in the early decades of their life history, followed by a rapid decrease in growth, slowly approaching a maximum body size. There were clear interspecific differences in initial estimated growth rate, growth period, and maximum size. In all species, apothecium production is strongly correlated with thallus size, but in U. hyperborea the relationship approximates an exponential function, while in the other species the trend is more linear. In U. proboscidea, the slowest to mature, a fairly high proportion of sterile individuals also occur in the higher size classes. There was no observed trade off between growth and reproduction. Quite the contrary: the species that grow faster also start to reproduce abundantly and early. The relatively slow growth and reproductive maturation of the species implies that a population of 40- to 50-year-old individual thalli is still a population consisting mainly of immigrants. The population size structure of all four species remains strongly skewed during the entire chronosequence, with a predominance of small thalli.Key words: plant life histories, lichen growth rates, size structure, Umbilicaria. |
format |
Article in Journal/Newspaper |
author |
Hestmark, Geir Skogesal, Olav Skullerud, Øystein |
author_facet |
Hestmark, Geir Skogesal, Olav Skullerud, Øystein |
author_sort |
Hestmark, Geir |
title |
Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization |
title_short |
Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization |
title_full |
Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization |
title_fullStr |
Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization |
title_full_unstemmed |
Growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization |
title_sort |
growth, reproduction, and population structure in four alpine lichens during 240 years of primary colonization |
publisher |
Canadian Science Publishing |
publishDate |
2004 |
url |
http://dx.doi.org/10.1139/b04-068 http://www.nrcresearchpress.com/doi/pdf/10.1139/b04-068 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
glacier |
genre_facet |
glacier |
op_source |
Canadian Journal of Botany volume 82, issue 9, page 1356-1362 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b04-068 |
container_title |
Canadian Journal of Botany |
container_volume |
82 |
container_issue |
9 |
container_start_page |
1356 |
op_container_end_page |
1362 |
_version_ |
1792500134482804736 |