Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence
Many plants and sessile animals may not show actuarial senescence, the increase in mortality with age predicted to be ubiquitous by classic evolutionary theories of aging. Age-structured demographic information is, however, limited for most organisms. We assessed the age distributions of nine dwarf...
Published in: | Ecosphere |
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Online Access: | https://portal.findresearcher.sdu.dk/da/publications/0dce7cab-a2f4-4f57-8412-fc12f92d7e10 https://doi.org/10.1002/ecs2.1521 https://findresearcher.sdu.dk/ws/files/124087339/Age_distributions_of_Greenlandic_dwarf_shrubs.pdf |
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ftsydanskunivpub:oai:sdu.dk:publications/0dce7cab-a2f4-4f57-8412-fc12f92d7e10 2024-04-28T08:17:25+00:00 Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence Dahlgren, Johan Rizzi, Silvia Schweingruber, Fritz Hellmann, Lena Büntgen, Ulf 2016 application/pdf https://portal.findresearcher.sdu.dk/da/publications/0dce7cab-a2f4-4f57-8412-fc12f92d7e10 https://doi.org/10.1002/ecs2.1521 https://findresearcher.sdu.dk/ws/files/124087339/Age_distributions_of_Greenlandic_dwarf_shrubs.pdf eng eng https://portal.findresearcher.sdu.dk/da/publications/0dce7cab-a2f4-4f57-8412-fc12f92d7e10 info:eu-repo/semantics/openAccess Dahlgren , J , Rizzi , S , Schweingruber , F , Hellmann , L & Büntgen , U 2016 , ' Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence ' , Ecosphere , vol. 7 , no. 10 , e01521 . https://doi.org/10.1002/ecs2.1521 article 2016 ftsydanskunivpub https://doi.org/10.1002/ecs2.1521 2024-04-10T14:28:28Z Many plants and sessile animals may not show actuarial senescence, the increase in mortality with age predicted to be ubiquitous by classic evolutionary theories of aging. Age-structured demographic information is, however, limited for most organisms. We assessed the age distributions of nine dwarf shrub species from 863 taproot samples collected in coastal east Greenland. Penalized composite link models (pclm) were used to fill gaps in the observed age ranges, caused by low species-specific sample sizes in relation to life span. Resulting distributions indicate that mortality patterns are independent of age. Actuarial senescence is thus negligible in these dwarf shrub populations. We suggest that smoothing techniques such as pclm enable consideration of noisy age data for determining age distributions. These distributions may, in turn, reveal age effects on demographic rates. Moreover, age determination from the root collars of small plants constitutes a powerful technique to further investigate age dependency of the demography of many plant species, including eudicot herbs. Using these methods for long-lived plants where long-term monitoring is unrealistic, we show that age is unlikely to be an important variable for making population projections and determining extinction risks. Article in Journal/Newspaper East Greenland Greenland greenlandic University of Southern Denmark Research Portal Ecosphere 7 10 |
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University of Southern Denmark Research Portal |
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ftsydanskunivpub |
language |
English |
description |
Many plants and sessile animals may not show actuarial senescence, the increase in mortality with age predicted to be ubiquitous by classic evolutionary theories of aging. Age-structured demographic information is, however, limited for most organisms. We assessed the age distributions of nine dwarf shrub species from 863 taproot samples collected in coastal east Greenland. Penalized composite link models (pclm) were used to fill gaps in the observed age ranges, caused by low species-specific sample sizes in relation to life span. Resulting distributions indicate that mortality patterns are independent of age. Actuarial senescence is thus negligible in these dwarf shrub populations. We suggest that smoothing techniques such as pclm enable consideration of noisy age data for determining age distributions. These distributions may, in turn, reveal age effects on demographic rates. Moreover, age determination from the root collars of small plants constitutes a powerful technique to further investigate age dependency of the demography of many plant species, including eudicot herbs. Using these methods for long-lived plants where long-term monitoring is unrealistic, we show that age is unlikely to be an important variable for making population projections and determining extinction risks. |
format |
Article in Journal/Newspaper |
author |
Dahlgren, Johan Rizzi, Silvia Schweingruber, Fritz Hellmann, Lena Büntgen, Ulf |
spellingShingle |
Dahlgren, Johan Rizzi, Silvia Schweingruber, Fritz Hellmann, Lena Büntgen, Ulf Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence |
author_facet |
Dahlgren, Johan Rizzi, Silvia Schweingruber, Fritz Hellmann, Lena Büntgen, Ulf |
author_sort |
Dahlgren, Johan |
title |
Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_short |
Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_full |
Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_fullStr |
Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_full_unstemmed |
Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_sort |
age distributions of greenlandic dwarf shrubs support concept of negligible actuarial senescence |
publishDate |
2016 |
url |
https://portal.findresearcher.sdu.dk/da/publications/0dce7cab-a2f4-4f57-8412-fc12f92d7e10 https://doi.org/10.1002/ecs2.1521 https://findresearcher.sdu.dk/ws/files/124087339/Age_distributions_of_Greenlandic_dwarf_shrubs.pdf |
genre |
East Greenland Greenland greenlandic |
genre_facet |
East Greenland Greenland greenlandic |
op_source |
Dahlgren , J , Rizzi , S , Schweingruber , F , Hellmann , L & Büntgen , U 2016 , ' Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence ' , Ecosphere , vol. 7 , no. 10 , e01521 . https://doi.org/10.1002/ecs2.1521 |
op_relation |
https://portal.findresearcher.sdu.dk/da/publications/0dce7cab-a2f4-4f57-8412-fc12f92d7e10 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/ecs2.1521 |
container_title |
Ecosphere |
container_volume |
7 |
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10 |
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1797582024523907072 |