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Folia Geobotanica

, Volume 52, Issue 3–4, pp 433–442 | Cite as

Accounting for clonality in comparative plant demography – growth or reproduction?

  • Zdeněk JanovskýEmail author
  • Tomáš Herben
  • Jitka Klimešová
Article

Abstract

Clonal growth occurs in a high proportion of herbaceous plant species, but it is difficult to deal with in demographic transition matrix models. It is primarily a growth process, but in many cases gives rise to new individuals from the viewpoint of plant demography. In the present contribution, we review how clonality is treated in existing demographic studies of clonal species from the Central European flora. We based our analyses on publicly accessible data in the COMPADRE and CLO-PLA databases and compiling from these information on plant matrix population models (hereafter MPMs) and clonal traits. Out of the 55 species × study combinations of species with known clonality, ca 30% neglect clonality. Another 30% treat clonal growth as growth of mother ramet and only the remaining 40% address clonality as a separate reproductive pathway. However, but only about half of these studies (12; 22% of total) reported a separable submatrix of clonal transitions necessary for comparative analyses. Here we show that failure to report clonal transitions separately leads to a serious bias in estimation of many demographic characteristics derived from MPMs, such as generation time. Shoot ontogeny (namely shoot lifespan and its branching architecture) largely determined whether clonality was neglected, treated as growth or treated as reproduction. Additionally, species with long runners were under-represented in demographic studies relative to their proportion in the Central European clonal flora. To conclude, we discuss how to construct MPMs for species with varying degree of ramet integration. We recommend that demographic analyses should focus on ramets – the smallest unit capable of living through all life-cycle stages of the species – as a sampling and study unit of plant populations.

Keywords

CLO-PLA COMPADRE Cyclicity Population projection matrix Ramet Shoot lifespan Shoot ontogeny 

Notes

Acknowledgements

We thank Kay Gross for her valuable comments on the previous versions of manuscript. The research reported here was supported by grants from the Czech Science Foundation (16-19245S, Centre of Excellence 14-36079G PLADIAS).

Supplementary material

12224_2017_9301_MOESM1_ESM.doc (37 kb)
ESM 1 (DOC 37 kb)

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Copyright information

© Institute of Botany, Academy of Sciences of the Czech Republic 2017

Authors and Affiliations

  1. 1.Department of Botany, Faculty of ScienceCharles UniversityPraha 2Czech Republic
  2. 2.Institute of BotanyAcademy of Science of the Czech RepublicPrůhoniceCzech Republic
  3. 3.Institute of BotanyAcademy of Science of the Czech RepublicTřeboňCzech Republic

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