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Reproduction of Crassula helmsii by seed in western Europe

Onderzoeksoutput: Bijdrage aan tijdschriftA1: Web of Science-artikel

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Reproduction of Crassula helmsii by seed in western Europe. / D'hondt, Bram; Denys, Luc; Jambon, Wim; De Wilde, Roeland; Adriaens, Tim; Packet, Jo; van Valkenburg, Johan.

In: Aquatic Invasions, Vol. 11, Nr. 2, 2016, blz. 125–130.

Onderzoeksoutput: Bijdrage aan tijdschriftA1: Web of Science-artikel

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@article{76e8b0b0d4614ae49874f62cb1728fb5,
title = "Reproduction of Crassula helmsii by seed in western Europe",
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, untilex 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.",
author = "Bram D'hondt and Luc Denys and Wim Jambon and {De Wilde}, Roeland and Tim Adriaens and Jo Packet and {van Valkenburg}, Johan",
year = "2016",
doi = "10.3391/ai.2016.11.2.02",
language = "English",
volume = "11",
pages = "125–130",
journal = "Aquatic Invasions",
issn = "1818-5487",
publisher = "International Association of Theoretical and Applied Limnology (SIL)",
number = "2",

}

RIS

TY - JOUR

T1 - Reproduction of Crassula helmsii by seed in western Europe

AU - D'hondt, Bram

AU - Denys, Luc

AU - Jambon, Wim

AU - De Wilde, Roeland

AU - Adriaens, Tim

AU - Packet, Jo

AU - van Valkenburg, Johan

PY - 2016

Y1 - 2016

N2 - 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, untilex 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.

AB - 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, untilex 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.

U2 - 10.3391/ai.2016.11.2.02

DO - 10.3391/ai.2016.11.2.02

M3 - A1: Web of Science-article

VL - 11

SP - 125

EP - 130

JO - Aquatic Invasions

JF - Aquatic Invasions

SN - 1818-5487

IS - 2

ER -

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