2015
DOI: 10.1614/ipsm-d-14-00068.1
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Grazing Vertebrates Promote Invasive Swamp Stonecrop (Crassula helmsii) Abundance

Abstract: The macrophyte swamp stonecrop has invaded a wide range of wetland habitats across Europe. An experiment was conducted within an invaded fen habitat, which tested whether the presence of grazing disturbance affected the relative abundance of swamp stonecrop, and whether any detected effect was suppressive or facilitative. The abundance of swamp stonecrop and co-occurring resident plants was monitored within fenced grazing exclosures and in adjacent unfenced plots. Swamp stonecrop abundance was higher in the un… Show more

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Cited by 9 publications
(7 citation statements)
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“…Restoration of these high production ecosystems generally takes place by removing the nutrient rich topsoil to enable the development of more biodiverse vegetation. However, when residual nutrients are retained in the system, these can facilitate the growth of C. helmsii (Dawson and Warman 1987;Dean et al 2015;Brouwer et al 2017;Van Kleef et al 2017), stressing the need to maximize nutrient removal in such restoration practices. Given our findings that C. helmsii was also well able to colonize bare oligotrophic ecosystems, this can be expected to be insufficient to prevent its invasion.…”
Section: Implications For Invasive Species Managementmentioning
confidence: 99%
See 1 more Smart Citation
“…Restoration of these high production ecosystems generally takes place by removing the nutrient rich topsoil to enable the development of more biodiverse vegetation. However, when residual nutrients are retained in the system, these can facilitate the growth of C. helmsii (Dawson and Warman 1987;Dean et al 2015;Brouwer et al 2017;Van Kleef et al 2017), stressing the need to maximize nutrient removal in such restoration practices. Given our findings that C. helmsii was also well able to colonize bare oligotrophic ecosystems, this can be expected to be insufficient to prevent its invasion.…”
Section: Implications For Invasive Species Managementmentioning
confidence: 99%
“…Geese droppings contain many poorly digested plant fragments, often still capable of vegetative regeneration (Denys et al 2014). Not only can these two processes greatly enhance propagule pressure over large areas, but nutrient release from feces also works as a natural fertilizer (Dawson and Warman 1987;Robert et al 2013;Dean et al 2015;Brouwer et al 2017;Hussner et al 2017). The enrichment of nutrients from feces is therefore hypothesized to facilitate the invasiveness of C. helmsii in oligotrophic ecosystems (Brouwer et al 2017;Van Kleef et al 2017), but only in the absence of competitors.…”
Section: Introductionmentioning
confidence: 99%
“…Direct effects of grazing known to influence plant communities include mechanisms such as consumption of plant biomass including below-ground parts, trampling of plants and soil, nutrient inputs and bacterial contamination from dung and urine (Tanner, 1991). The indirect effects of grazing include influences such as reduced pollinator floral visitations, increased habitat disturbance and facilitation of species invasion (Leinaas et al, 2015;Dean et al, 2015). As such, in this study we focused on the indirect and direct effects and intensity of grazing influences on plant species richness, abundance and species composition in wetland ecosystems.…”
Section: Influence Of Grazing On Species Richness Abundance and Specmentioning
confidence: 99%
“…Locaties met watercrassula worden daarom idealiter uitgerasterd, zodat betreding en verspreiding door grazers niet langer mogelijk is. Begrazing kan kolonisatie ook stimuleren door vorming van onbegroeide trapgaten, nutriëntengift en bodemmineralisatie (Dean et al 2015. Diaz (2012) beschrijft dat watercrassula in een dicht rietmoeras in Dorset veel sterker groeit langs door Sika herten Cervus nippon gebaande paadjes en dat deze wellicht belangrijke corridors voor verspreiding vormen.…”
Section: Verspreidingsbevorderende Factoren 2731 Begrazingunclassified
“…Plantfragmenten en zaden blijven gemakkelijk aan de poten en in de vacht van deze dieren hangen en worden zo naar elders getransporteerd. Daarbovenop blijkt begrazing de abundantie en dominantie van watercrassula in de hand te werken (Dean et al 2015). Wanneer een poel of perceel besmet is met watercrassula, is het daarom beter om deze tot minstens 1 meter buiten de hoge oever, resp.…”
Section: Dempenunclassified