How to translate text using browser tools
1 September 2006 The distribution and habitat associations of non-native plant species in urban riparian habitats
L. C. Maskell, J. M. Bullock, S. M. Smart, K. Thompson, P. E. Hulme
Author Affiliations +

Questions: 1. What are the distribution and habitat associations of non-native (neophyte) species in riparian zones? 2. Are there significant differences, in terms of plant species diversity, composition, habitat condition and species attributes, between plant communities where non-natives are present or abundant and those where non-natives are absent or infrequent? 3. Are the observed differences generic to non-natives or do individual non-native species differ in their vegetation associations?

Location: West Midlands Conurbation (WMC), UK.

Methods: 56 sites were located randomly on four rivers across the WMC. Ten 2 m × 2 m quadrats were placed within 15 m of the river to sample vegetation within the floodplain at each site. All vascular plants were recorded along with site information such as surrounding land use and habitat types.

Results: Non-native species were found in many vegetation types and on all rivers in the WMC. There were higher numbers of non-natives on more degraded, human-modified rivers. More non-native species were found in woodland, scrub and tall herb habitats than in grasslands. We distinguish two types of communities with non-natives. In communities colonized following disturbance, in comparison to quadrats containing no non-native species, those with non-natives had higher species diversity and more forbs, annuals and short-lived monocarpic perennials. Native species in quadrats containing non-natives were characteristic of conditions of higher fertility and pH, had a larger specific leaf area and were less stress tolerant or competitive. In later successional communities dominated by particular non-natives, native diversity declined with increasing cover of non-natives. Associated native species were characteristic of low light conditions.

Conclusions: Communities containing non-natives can be associated with particular types of native species. Extrinsic factors (disturbance, eutrophication) affected both native and non-native species. In disturbed riparian habitats the key determinant of diversity is dominance by competitive invasive species regardless of their native or non-native origin.

Nomenclature: Stace (1991).

L. C. Maskell, J. M. Bullock, S. M. Smart, K. Thompson, and P. E. Hulme "The distribution and habitat associations of non-native plant species in urban riparian habitats," Journal of Vegetation Science 17(4), 499-508, (1 September 2006).[499:TDAHAO]2.0.CO;2
Received: 8 August 2005; Accepted: 29 May 2006; Published: 1 September 2006

This article is only available to subscribers.
It is not available for individual sale.

biological invasion
habitat preference
Plant attribute
species richness
Get copyright permission
Back to Top