Extending the Timeframe for Rapid Response and Best Management Practices of Flood-Dispersed Japanese Knotweed (<i>Fallopia japonica</i>)

Colleran, Brian; Goodall, Katherine

doi:10.1614/ipsm-d-14-00046.1

Cited by 16 publications

(19 citation statements)

References 17 publications

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“…There is a broad consensus that plant invasion will increase, and is already increasing due to climate change (Clements and DiTommaso, 2011;DiTommaso et al, 2014;Varanasi and Jugulam, 2016;Ramesh et al, 2017;Waryszak et al, 2018;Ziska et al, 2019). Three prominent predictions are: (1) poleward spread due to climate warming (Clements and DiTommaso, 2011), (2) range expansion due to changing precipitation regimes (Young et al, 2017), and (3) increased dispersal and establishment due to extreme climate events (Colleran and Goodall, 2015). Below we provide examples of these three predicted consequences of climate change, as well as the potential influence of rapid weed evolution as part of the response.…”

Section: Recent Examples Of Increased Invasion Under Climate Changementioning

confidence: 99%

Rapid Evolution of Invasive Weeds Under Climate Change: Present Evidence and Future Research Needs

Clements

Jones

2021

Front. Agron.

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Although evolution has been often seen as a gradual process through a Darwinian lens, far more rapid evolutionary change has been observed in recent times. Recent examples documenting the potential speed of invasive plant evolution have included: latitudinal flowering clines, life history shifts, or abrupt changes in morphology. The timescales for such observations range from centuries down to <5 years. Invasive weeds provide good models for the rapid changes, partly because invasive weeds exhibit unique evolutionary mechanisms integral to their success. For example, purging of their genetic load may enable invasive plants to adapt more rapidly. Other genetic mechanisms include plasticity as an evolved trait, hybridization, polyploidy, epigenetics, and clonal division of labor. It is well-demonstrated that anthropogenic stressors such as habitat disturbance or herbicide use may work synergistically with climate change stressors in fostering rapid weed evolution. Changing temperatures, moisture regimes and extreme climate events operate universally, but invasive plant species are generally better equipped than native plants to adapt. Research on this potential for rapid evolution is critical to developing more proactive management approaches that anticipate new invasive plant ecotypes adapted to changing climatic conditions.

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Section: Recent Examples Of Increased Invasion Under Climate Changementioning

confidence: 99%

Rapid Evolution of Invasive Weeds Under Climate Change: Present Evidence and Future Research Needs

Clements

Jones

2021

Front. Agron.

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“…During removal of flood‐distributed knotweed s.l . propagules (Colleran & Goodall, 2014, 2015), we found that removing newly established plants by hand was fastest; the lack of root hairs aided in sifting plants directly from the ground. From results showing (a) underground rhizomes as the predominant source of new knotweed s.l .…”

Section: Introductionmentioning

confidence: 76%

Invasive Japanese knotweed (Reynoutria japonica Houtt.) and related knotweeds as catalysts for streambank erosion

Colleran

Lacy²,

Retamal

2020

River Research & Apps

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Japanese knotweed (Reynoutria japonica) and the other invasive knotweeds, collectively known as knotweed s.l., are significant invasives worldwide, especially of riparian areas. While R. japonica and other knotweed s.l. can reproduce sexually, their dispersal to and spread within new regions is often accomplished through vegetative reproduction from rhizome and stem fragments. Once established, knotweed s.l. can displace riparian plants, meaning that soil stability once provided by displaced roots is lost, carrying significant knock‐on implications for watershed management. We propose that knotweed s.l. rhizomes both displace roots and the structure they provide to soil, and also amplify bank‐erosion forces, especially during floods. Further, erosive forces create propagules, with larger flow events creating larger numbers of propagules and providing the vector for short‐ and long‐distance downstream spread within the watershed. Induced erosion is therefore the main driver of knotweed s.l. invasions along waterways. As some hydrological regimes shift towards more frequent and severe storm events in response to climate change, positive feedback loops may develop in these regions between existing knotweed s.l. populations, sudden riverbank failure, and increased flood‐related damage, with presumably significant impacts on riparian infrastructure. While the continued spread of this invasive could have significant riparian flood resiliency consequences if left unchecked, mindful action to control these plants is likely to be beneficial financially, socially, and ecologically within any invaded watershed.

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“…Likewise, invasions of SMFFs that are not already dominated by F. japonica should be prevented by early detection and rapid removal of new propagules/colonists (e.g. Colleran and Goodall 2014 , Colleran and Goodall 2015 ). In addition to F. japonica , our results suggest these efforts should account for other invasive species that have become prominent in the region, particularly Alliaria petiolata (M.…”

Section: Discussionmentioning

confidence: 99%

Understory dominance and the new climax: Impacts of Japanese knotweed (Fallopia japonica) invasion on native plant diversity and recruitment in a riparian woodland

Wilson¹,

Freundlich²,

Martine³

2017

BDJ

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Riparian forests exhibit levels of ecological disturbance that leave them especially prone to biological invasions. Japanese knotweed (Fallopia japonica) is particularly suited to these habitats and is an aggressive invader along watercourses throughout its now-global range as an exotic invader. Using one of the few Silver Maple Floodplain Forest communities that has not been invaded by F. japonica in the West Branch Susquehanna River valley (Pennsylvania, USA) as a baseline, this study examines whether and how this primarily intact riparian forest community differs from nearby invaded communities in terms of 1) native species richness, 2) native species density, and 3) riparian forest tree recruitment. Defining a baseline (intact) community composition will inform restoration plans for local riparian forests where knotweed might be eradicated or reduced. Invaded and non-invaded sites differed statistically across species richness, species density, and tree recruitment. Our results suggest that F. japonica has reduced the diversity and abundance of native understory riparian plant species. The species also appears to have suppressed long-term tree recruitment, setting up a trajectory whereby the eventual decline of trees currently in the canopy could shift this community from a tree-dominated riparian forest to a knotweed-dominated herbaceous shrubland.

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Extending the Timeframe for Rapid Response and Best Management Practices of Flood-Dispersed Japanese Knotweed (Fallopia japonica)

Cited by 16 publications

References 17 publications

Rapid Evolution of Invasive Weeds Under Climate Change: Present Evidence and Future Research Needs

Rapid Evolution of Invasive Weeds Under Climate Change: Present Evidence and Future Research Needs

Invasive Japanese knotweed (Reynoutria japonica Houtt.) and related knotweeds as catalysts for streambank erosion

Understory dominance and the new climax: Impacts of Japanese knotweed (Fallopia japonica) invasion on native plant diversity and recruitment in a riparian woodland

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