Vlaanderen.be

Research output

Reproduction of Crassula helmsii by seed in western Europe

Research output: Contribution to journalA1: Web of Science-articleResearchpeer-review

Authors

  • Bram D'hondt
  • Wim Jambon
  • Roeland De Wilde
  • Johan van Valkenburg

External Organisations

  • Biology Department, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium
  • Netherlands Food and Consumer Safety Authority, P.O. Box 9102, 6700 HC Wageningen, The Netherlands

Details

Original languageEnglish
JournalAquatic Invasions
Volume11
Issue number2
Pages (from-to)125–130
ISSN1818-5487
Publication statusPublished - 2016

Abstract

The amphibious plant species Crassula helmsii is a widely established and still-spreading alien in various parts of Europe, where it is considered invasive as its dense swards stress the viability of local biota. The species was considered to exclusively reproduce through vegetative means, until
ex situ germination was recorded from a single locality in Belgium. We assessed whether this seed viability holds on a wider scale, by testing 16 populations from The Netherlands, Belgium, northern France, eastern England and northern Germany in a greenhouse germination experiment. Seedlings were observed from all populations but two, and from each of the five countries. Although most fruits were lacking seeds and the inferred germination percentages were overall low, germinable seed numbers are considerable given the high density of flowering stems. An in situ test revealed seeds to make it through normal winter conditions without signs of physical damage and with retention of germinability. Our results suggest that reproduction by seed is a relatively cryptic but widespread phenomenon throughout western Europe. The persistency of seed banks requires further investigation. Nonetheless, these findings already challenge the efficacy of techniques currently applied in C. helmsii control.

EWI Biomedical sciences

Taxonomic list

Free keywords

  • invasive alien species, invasive species
Research output (related by authors)
Shopping cart
Add to cart Saved citations

Copy the text from this field...

Documents

Documents

DOI

Relations
View graph of relations