Počet záznamů: 1
Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence
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SYSNO ASEP 0473095 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Age distributions of Greenlandic dwarf shrubs support concept of negligible actuarial senescence Tvůrce(i) Dahlgren, J. P. (SE)
Rizzi, S. (DK)
Schweingruber, F. H. (CH)
Hellmann, L. (CH)
Büntgen, Ulf (UEK-B) RID, ORCID, SAICelkový počet autorů 5 Číslo článku e01521 Zdroj.dok. Ecosphere . - : Wiley - ISSN 2150-8925
Roč. 7, č. 10 (2016)Poč.str. 5 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova actuarial senescence ; age distribution ; age structure ; Arctic dwarf shrubs ; dendroecology ; individual survival ; mortality ; penalized composite link model ; plant aging ; shrub demography Vědní obor RIV EH - Ekologie - společenstva CEP EE2.3.20.0248 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora RVO:67179843 - RVO:67179843 UT WOS 000387216300051 EID SCOPUS 84993969483 DOI 10.1002/ecs2.1521 Anotace 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. Pracoviště Ústav výzkumu globální změny Kontakt Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Rok sběru 2017
Počet záznamů: 1