Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence
Abstract 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 ni...
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Online Access: | http://dx.doi.org/10.1002/ecs2.1521 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecs2.1521 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1521 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecs2.1521 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1521 |
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crwiley:10.1002/ecs2.1521 2024-03-17T08:57:39+00:00 Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence Dahlgren, Johan P. Rizzi, Silvia Schweingruber, Fritz H. Hellmann, Lena Büntgen, Ulf Max-Planck-Gesellschaft 2016 http://dx.doi.org/10.1002/ecs2.1521 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecs2.1521 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1521 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecs2.1521 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1521 en eng Wiley http://creativecommons.org/licenses/by/3.0/ Ecosphere volume 7, issue 10 ISSN 2150-8925 2150-8925 Ecology Ecology, Evolution, Behavior and Systematics journal-article 2016 crwiley https://doi.org/10.1002/ecs2.1521 2024-02-22T01:42:57Z Abstract 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 Wiley Online Library Greenland Ecosphere 7 10 |
institution |
Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
topic |
Ecology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Ecology Ecology, Evolution, Behavior and Systematics Dahlgren, Johan P. Rizzi, Silvia Schweingruber, Fritz H. Hellmann, Lena Büntgen, Ulf Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence |
topic_facet |
Ecology Ecology, Evolution, Behavior and Systematics |
description |
Abstract 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. |
author2 |
Max-Planck-Gesellschaft |
format |
Article in Journal/Newspaper |
author |
Dahlgren, Johan P. Rizzi, Silvia Schweingruber, Fritz H. Hellmann, Lena Büntgen, Ulf |
author_facet |
Dahlgren, Johan P. Rizzi, Silvia Schweingruber, Fritz H. Hellmann, Lena Büntgen, Ulf |
author_sort |
Dahlgren, Johan P. |
title |
Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_short |
Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_full |
Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_fullStr |
Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_full_unstemmed |
Age distributions of <scp>G</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence |
title_sort |
age distributions of <scp>g</scp>reenlandic dwarf shrubs support concept of negligible actuarial senescence |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1002/ecs2.1521 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fecs2.1521 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1521 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ecs2.1521 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.1002/ecs2.1521 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
Ecosphere volume 7, issue 10 ISSN 2150-8925 2150-8925 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.1002/ecs2.1521 |
container_title |
Ecosphere |
container_volume |
7 |
container_issue |
10 |
_version_ |
1793766911324979200 |