Abiotic constraints and biotic resistance control the establishment success and abundance of invasive Humulus japonicus in riparian habitats

Fried, Guillaume; Mahaut, Lucie; Pinston, Amandine; Carboni, Marta

doi:10.1007/s10530-017-1533-y

Cited by 8 publications

(15 citation statements)

References 37 publications

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“…Riparian vegetation of Mediterreanean rivers such as the Gardon River consists in a succession of different communities from herbaceous pioneer communities dominated by Persicaria lapathifolia, Veronica anagallis-aquatica and Bidens frondosa (Bidention communities) to riparian forests dominated by Populus alba. A previous study showed that H. japonicus has its optimum in the Bidention communities in eutrophic soils and full sun exposure (Fried et al, 2018).…”

Section: Study Area and Habitatmentioning

confidence: 98%

Functional traits modulate plant community responses to alien plant invasion

Fried

Carboni

Mahaut

et al. 2019

Perspectives in Plant Ecology, Evolution and Systematics

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It is well known that alien plant invasion modifies the composition and diversity of resident plant communities, yet our ability to predict patterns of vegetation responses to invasion is hampered by a poor understanding of which functional traits make some resident plants more or less vulnerable to invader impacts. For example, resident species may be more likely to persist and coexist with the invader if they display different strategies of resource use (i.e. high niche differences) or if they share similar highly competitive traits (i.e. competitive hierarchy).Here, we used a trait-based approach to 1) specifically test whether species changes in abundance following plant invasion is random or depends on specific functional trait values, 2) identify which functional strategies allow resident species to coexist with the invader and 3) assess to what extent communities where the invader has been removed return to a reference state. To do so, we applied a semi-experimental approach with the annual vine Humulus japonicus, an invasive species in riparian habitats of Southern France. We monitored plant communities seven times over two years in non-invaded reference plots, invaded plots and removal plots in which the invader had been removed at the seedling stage. We quantified species richness and functional richness as well as mean community trait values of seven traits.The comparison of invaded and removal plots highlighted a strong impact of Humulus japonicus on both species and functional richness of riparian communities. Resident species that had a distinct flowering onset from the invader faced less pronounced declines. Specifically, species that flowered before the invader reached high cover, and species that had a short flowering duration had lower risk of declining. In addition, species coexisting with the invader when it reached its maximum cover displayed high stature and high seed mass. These results suggest that both niche differentiation (in terms of flowering strategy) and competitive hierarchies (in terms of height and regeneration strategy) play a role in explaining plant community responses to plant invasion. Finally, while species richness recovered rapidly in removal plots, functional richness remained lower than in non-invaded plots, pointing to a stateshift that would otherwise go undetected. Overall, our study highlights that the analysis of the functional traits of both invaders and resident species, combined with regular monitoring over time of non-invaded reference plots, invaded and removal plots can greatly improve our understanding of the impact of plant invasion on resident communities.

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Section: Study Area and Habitatmentioning

confidence: 98%

Functional traits modulate plant community responses to alien plant invasion

Fried

Carboni

Mahaut

et al. 2019

Perspectives in Plant Ecology, Evolution and Systematics

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“…This is highly consistent with patterns of germination observed in the native range where emergence occurred from February to early May with a peak in March (Masuda & Washitani, ). In a study in March 2014, a mean of 37.9 seedlings m −2 were measured in 43 plots in the south of France (Fried et al ., ). A study in the native range found a mean of 32.3 ± 37.0 seedlings m −2 (Masuda & Washitani, ).…”

Section: Biology and Ecologymentioning

confidence: 97%

“…In France, the species is invasive in very similar communities to those dominated by the native species Galium aparine, Atriplex prostrata, Rumex crispus, Persicaria lapathifolia, Veronica anagallis-aquatica, Convolvulus sepium and the non-native species Ambrosia artemisiifolia, Artemisia verlotiorum, Artemisia annua, Bidens frondosa, Helianthus tuberosus, and Xanthium orientale subsp. italicum (Fried et al, 2018). In Hungary, it has been described in other communities (such as the syntaxonomical unit: Convolvuletalia sepium) belonging to the same riparian habitats (Balogh & Dancza, 2008).…”

Section: Habitatsmentioning

confidence: 99%

“…In both its native range and its introduced range, H. scandens is a plant of riversides, particularly on the loose, bare surfaces of alluvial bars formed by river and streamsides by temporary floods (Zhou & Bartholomew, 2003;Balogh & Dancza, 2008;Fried et al, 2018). The plant can also invade ruderal areas under climates with no dry seasons.…”

Section: Habitatsmentioning

confidence: 99%

“…The first established populations were identified in 2004 (Brunel & Tison, 2005) in a disturbed portion of riparian habitat along the Gardon River, near Nîmes in the Mediterranean region (South-East France). Further surveys conducted in 2012 revealed the presence of the species along 40 km of the river between Al es and the confluence of the Gardon River with the Rhône (Pinston, 2013;Mahaut, 2014;Fried et al, 2018). Since 2015, H. scandens has been recorded in a second catchment in the Huveaune River in the city of Marseille (Fried, 2017).…”

Section: History Of Introduction and Spreadmentioning

confidence: 99%

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Humulus scandens (Lour.) Merr.

2019

EPPO Bulletin

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The success of alien plants in an arid ecosystem: Structural equation modeling reveals hidden effects of soil resources

et al. 2021

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The diversity of a native community is not the sole driving factor determining the success of an invader; abiotic factors can also play a role, making it important to understand their contributions in modifying the expected outcome of biotic and abiotic resistance to invasion. In order to test the contributions of native diversity, relatedness between native and alien plants, and abiotic factors in resisting alien invasion, we used a trait-environment data set of 33 alien-and 130 native plants in 166 invaded plots, covering a gradient of soil resources in Saint-Katherine-Protectorate, an arid-protected area in Egypt. We measured the native diversity components as predictors of native biotic resistance. We quantified the success of alien plants based on their abundance and their performance traits. Additionally, we calculated the mean functional and phylogenetic distance between aliens and natives in each plot. We tested all plausible influences of native diversity components, relatedness, and soil resources on alien abundance and performance first using mixed-effects models and second with a structural equation model (SEM). Mixed-effect models revealed that, in the resource-rich environments, alien abundance increased even though native plants were more productive, but alien performance decreased. SEM direct pathways revealed that native communities with high functional dispersion and richness and high mean-weighted performance traits repelled alien plants by lowering their success. Simultaneously, in line with mixed-effect models results, the effect of soil resources on alien success was found to be indirect, being mediated by the mean functional and phylogenetic distance between aliens and natives: The success of alien plants increased in resourcerich environments when they were dissimilar to the natives, while it decreased for aliens similar to natives in resource-limited environments. Our findings provide new insights on native community resistance to invasion, with resistance being higher in resource-limited environments and when aliens are functionally and phylogenetically similar to resident natives.

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Abiotic constraints and biotic resistance control the establishment success and abundance of invasive Humulus japonicus in riparian habitats

Cited by 8 publications

References 37 publications

Functional traits modulate plant community responses to alien plant invasion

Functional traits modulate plant community responses to alien plant invasion

Humulus scandens (Lour.) Merr.

The success of alien plants in an arid ecosystem: Structural equation modeling reveals hidden effects of soil resources

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