Invasive weeds in urban riparian zones: the influence of catchment imperviousness and soil chemistry across an urbanization gradient

Grella, Chiara; Renshaw, Adrian; Wright, Ian

doi:10.1007/s11252-018-0736-z

Cited by 29 publications

(30 citation statements)

References 59 publications

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“…Although urban areas were characterized by heterogeneous landscape compositions and configurations [17,58], the aggravation of anthropogenic disturbances and consequent habitat homogenization pose a great challenge for conservation in floodplain landscapes [36,41]. Hence, there is an urgent need to maintain habitat heterogeneity within floodplain landscapes.…”

Section: Implication For Conservationmentioning

confidence: 99%

“…Humans have an adverse effect on natural habitats due to various activities, including urbanization, deforestation, roads, farming, and change of environmental conditions [8]. Therefore, anthropogenic disturbance was considered one of the most important and rapid human-driven factors that lead to trampling of vegetation, and introduction of non-native species [40,41]. Moreover, anthropogenic disturbance disrupts the heterogeneity of the floodplain landscape by construction of hardening banks and recreational spaces, and destruction of floodplain forests, which in turn alters the composition and diversity of plant assemblages [42,43].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Anthropogenic Disturbance on Floristic Homogenization in the Floodplain Landscape: Insights from the Taxonomic and Functional Perspectives

Cao

Natuhara

2020

Forests

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Anthropogenic disturbances pose significant threats to biodiversity. However, limited information has been acquired regarding the degree of impact human disturbance has on the β-diversity of plant assemblages, especially in threatened ecosystems (e.g., floodplains). In the present study, the effects of anthropogenic disturbance on plant communities of floodplain areas (the Miya River, Mie Prefecture, Japan) were analyzed. The taxonomic and functional β-diversity among different degradation levels were compared, and the differences were assessed by tests for homogeneity in multivariate dispersions. In addition, the effects of non-native species and environmental factors on β-diversity were analyzed. As revealed from the results, anthropogenic disturbance led to taxonomic homogenization at a regional scale. The increase in non-native invasions tended to improve homogenization, whereas at a low degradation level, the occurrence of non-natives species was usually related to taxonomic differentiation. Furthermore, though the increase in non-natives and environmental parameters significantly affected the β-diversity of the floodplain area, environmental factors may be of more crucial importance than biotic interactions in shaping species assemblages in this study. The previously mentioned result is likely to be dependent on the research scale and the extent to which floodplains are disturbed. Given the significant importance of floodplains, the significance of looking at floodplains in the different levels of degradation was highlighted, and both invasion of non-native species and environmental factors should be considered to gain insights into the response of ecosystems to anthropogenic disturbance. The findings of this study suggested that conservation programs in floodplain areas should place more emphasis on the preservation of natural processes and forest resources.

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Section: Implication For Conservationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Anthropogenic Disturbance on Floristic Homogenization in the Floodplain Landscape: Insights from the Taxonomic and Functional Perspectives

Cao

Natuhara

2020

Forests

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“…The most common metric for urban intensity is based on percentages of land being represented by different LULC classes, such as built-up cover, forest cover, and in some cases the level of imperviousness (Grella et al, 2018;Moffatt et al, 2004;Rouquette et al, 2013;Schwoertzig et al, 2016;Wenger et al, 2009). Such data are freely available for many regions but it has been suggested that they do not adequately describe the urban landscape heterogeneity because they typically have coarse spatial resolution and/or are outdated, aspects that are extremely important in fast-changing urbanising landscapes (Pickett et al, 2008).…”

Section: How To Measure Urbanisation?mentioning

confidence: 99%

“…Finally, soils in urban riparian areas are exposed to extensive loads of sediment as well as organic and inorganic pollutants and contaminants (Kaushal & Belt, 2012;Wenger et al, 2009). Although these substances are probably more life-threatening for organisms within the aquatic environment, riparian plant communities also assemble based on their tolerance to chemical conditions within the soil matrix (Grella, Renshaw, & Wright, 2018;Guida-Johnson, Faggi, & Zuleta, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Even after such integration, substantial variance in the species richness data remained unexplained. At the same time, it is also possible that the unexplained variance in riparian vegetation patterns is connected to something other than LULC factors and catchment area, such as historical development, substrate conditions, and/ or dispersal dynamics(Aronson et al, 2017;Grella et al, 2018;Groffman et al, 2003).…”

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confidence: 99%

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Importance of scale, land‐use, and stream network properties for riparian plant communities along an urban gradient

et al. 2019

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Riparian forests along urban streams are affected by flashy hydrological regimes and adjacent upland land‐use, and their downstream dynamics are altered by forest fragmentation and by frequent river network truncation. This can lead to lower riparian habitat quality, decreased dispersal along the river network and increased recruitment of novel plant communities including non‐native species. Compared to forested landscapes, our understanding of riparian plant community diversity and composition along urban river networks is poor. We investigated riparian plant communities and riparian habitat variables along seven river networks situated along an urban gradient in the Greater Toronto Area, Canada. Six land‐use metrics classifying the intensity of urbanisation on three spatial scales (sub‐catchment, upstream riparian buffer, site buffer) were tested to explain the variation in riparian plant communities along the river networks and to describe the differences in riparian habitat. Riparian plant diversity peaked at sites which had between 40% and 70% of built‐up land cover within sub‐catchments; however, these communities contained a large number of non‐native species compared to the forested streams. While total species richness and native species richness were more related to river network factors (catchment area), non‐native richness was also affected by land‐use within a site. Community composition was more related to local land‐use than catchment area. Geographical distance between sites (both overland and hydrological) was increasingly more important for community heterogeneity along the urbanisation gradient. Riparian habitat worsened along the urbanisation gradient, with higher disturbance and soil pH and lower soil organic content and bryophyte cover in the more urban catchments. Riparian habitat variables were also related to the position along the river networks. Our results provide important insights into how riparian plant communities and riparian habitat differ along a gradient of urbanisation. Compared to previous studies we investigated the patterns in riparian vegetation in the context of river networks, including a variety of land‐use metrics, and analysed data across different spatial scales. This revealed important trends in plant diversity, demonstrated that urban land‐use increases the occurrence of non‐native species, and showed that the land‐use at the local scale is a stronger determinant of plant assemblages compared to land‐use at broader scales. These novel findings can be applied to land management in order to mitigate the effects of urbanisation on riparian ecosystems and the functions they provide for adjacent streams and rivers.

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An overview of non‐native species invasions in urban river corridors

Francis

Chadwick

Turbelin

2019

River Research & Apps

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Recent studies have highlighted cities as prime locations for the introduction, establishment, and spread of non‐native and invasive species. As the hydrological arteries of cities, urban river corridors have an important role to play in influencing species invasions. This overview examines existing literature to consider (a) how the landscape functions of urban river corridors (habitat, conduit, barrier/filter, sink, and source) relate to species invasions; (b) the organismal and geographical foci of research into non‐native species invasions along urban rivers; and (c) the need to more fully consider the roles that non‐native species may play in the recombinant communities of novel urban river ecosystems. The review ends with an identification of research priorities at the intersection of urban river corridor function and invasion biology.

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Invasive weeds in urban riparian zones: the influence of catchment imperviousness and soil chemistry across an urbanization gradient

Cited by 29 publications

References 59 publications

Effect of Anthropogenic Disturbance on Floristic Homogenization in the Floodplain Landscape: Insights from the Taxonomic and Functional Perspectives

Effect of Anthropogenic Disturbance on Floristic Homogenization in the Floodplain Landscape: Insights from the Taxonomic and Functional Perspectives

Importance of scale, land‐use, and stream network properties for riparian plant communities along an urban gradient

An overview of non‐native species invasions in urban river corridors

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