Assessing the vulnerability of riparian vegetation to invasion by Mimulus guttatus: relative importance of biotic and abiotic variables in determining species occurrence and abundance

Anne-Marie Truscott, S. C. F. Palmer, C. Soulsby, P. E. Hulme

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Riparian habitats are particularly susceptible to invasion by non-native plants. At present, attempts to build consensus as to what the primary drivers of plant invasion in riparian ecosystems might be is hindered by the absence of common standards for data collected on plant species (e.g. occurrence, or relative abundance). Mimulus guttatus L., a non-native riparian plant species, was used as a model to determine how environmental drivers influence two aspects of invasibility: species occurrence and abundance (assessed in relation to three variables number of patches, patch area and number of stems per patch). Mimulus occurrence and abundance, together with 20 environmental variables, were surveyed in almost 700 contiguous 50-m-long riverbank segments within a catchment in north-east Scotland. More than half of the segments had been colonized by Mimulus. Occurrence and number of patches responded to similar environmental gradients, particularly bare sediment, boulders, high soil moisture, short-statured ruderal communities, and open canopies, and tended to be highest downstream where the river was widest. In contrast to occurrence and patch number, patch area and stem number per patch were higher in the upper reaches of the catchment and were positively associated with low tree canopy and vegetation dominated by light-demanding species and smaller-statured species. Patch area and stem number per patch were also positively related to grazing. This study has highlighted the importance of assessing more than one measure of invasion success (occurrence or patch number and either patch area or stem number per patch), as they are each determined by a different suite of environmental variables. Abiotic factors, such as sediment availability and presence of boulders, appeared to be the major determinants of occurrence and patch number, whereas biotic factors, such as interspecific competition and grazing, were more important ecological determinants underlying area and stem number per patch.

Original languageEnglish
Pages (from-to)412-421
Number of pages10
JournalDiversity and Distributions
Volume14
Early online date21 Dec 2007
DOIs
Publication statusPublished - Mar 2008

Keywords

  • alien
  • biological invasions
  • environmental drivers
  • exotic species
  • invasive species
  • plant strategies
  • species distribution
  • principal-components-analysis
  • plant invasions
  • environmental-conditions
  • seed dispersal
  • Iberian River
  • New-Zealand
  • patterns
  • management
  • diversity

Cite this

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title = "Assessing the vulnerability of riparian vegetation to invasion by Mimulus guttatus: relative importance of biotic and abiotic variables in determining species occurrence and abundance",
abstract = "Riparian habitats are particularly susceptible to invasion by non-native plants. At present, attempts to build consensus as to what the primary drivers of plant invasion in riparian ecosystems might be is hindered by the absence of common standards for data collected on plant species (e.g. occurrence, or relative abundance). Mimulus guttatus L., a non-native riparian plant species, was used as a model to determine how environmental drivers influence two aspects of invasibility: species occurrence and abundance (assessed in relation to three variables number of patches, patch area and number of stems per patch). Mimulus occurrence and abundance, together with 20 environmental variables, were surveyed in almost 700 contiguous 50-m-long riverbank segments within a catchment in north-east Scotland. More than half of the segments had been colonized by Mimulus. Occurrence and number of patches responded to similar environmental gradients, particularly bare sediment, boulders, high soil moisture, short-statured ruderal communities, and open canopies, and tended to be highest downstream where the river was widest. In contrast to occurrence and patch number, patch area and stem number per patch were higher in the upper reaches of the catchment and were positively associated with low tree canopy and vegetation dominated by light-demanding species and smaller-statured species. Patch area and stem number per patch were also positively related to grazing. This study has highlighted the importance of assessing more than one measure of invasion success (occurrence or patch number and either patch area or stem number per patch), as they are each determined by a different suite of environmental variables. Abiotic factors, such as sediment availability and presence of boulders, appeared to be the major determinants of occurrence and patch number, whereas biotic factors, such as interspecific competition and grazing, were more important ecological determinants underlying area and stem number per patch.",
keywords = "alien, biological invasions, environmental drivers, exotic species, invasive species, plant strategies, species distribution, principal-components-analysis, plant invasions, environmental-conditions, seed dispersal, Iberian River, New-Zealand, patterns, management, diversity",
author = "Anne-Marie Truscott and Palmer, {S. C. F.} and C. Soulsby and Hulme, {P. E.}",
year = "2008",
month = "3",
doi = "10.1111/j.1472-4642.2007.00449.x",
language = "English",
volume = "14",
pages = "412--421",
journal = "Diversity and Distributions",
issn = "1366-9516",
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T1 - Assessing the vulnerability of riparian vegetation to invasion by Mimulus guttatus

T2 - relative importance of biotic and abiotic variables in determining species occurrence and abundance

AU - Truscott, Anne-Marie

AU - Palmer, S. C. F.

AU - Soulsby, C.

AU - Hulme, P. E.

PY - 2008/3

Y1 - 2008/3

N2 - Riparian habitats are particularly susceptible to invasion by non-native plants. At present, attempts to build consensus as to what the primary drivers of plant invasion in riparian ecosystems might be is hindered by the absence of common standards for data collected on plant species (e.g. occurrence, or relative abundance). Mimulus guttatus L., a non-native riparian plant species, was used as a model to determine how environmental drivers influence two aspects of invasibility: species occurrence and abundance (assessed in relation to three variables number of patches, patch area and number of stems per patch). Mimulus occurrence and abundance, together with 20 environmental variables, were surveyed in almost 700 contiguous 50-m-long riverbank segments within a catchment in north-east Scotland. More than half of the segments had been colonized by Mimulus. Occurrence and number of patches responded to similar environmental gradients, particularly bare sediment, boulders, high soil moisture, short-statured ruderal communities, and open canopies, and tended to be highest downstream where the river was widest. In contrast to occurrence and patch number, patch area and stem number per patch were higher in the upper reaches of the catchment and were positively associated with low tree canopy and vegetation dominated by light-demanding species and smaller-statured species. Patch area and stem number per patch were also positively related to grazing. This study has highlighted the importance of assessing more than one measure of invasion success (occurrence or patch number and either patch area or stem number per patch), as they are each determined by a different suite of environmental variables. Abiotic factors, such as sediment availability and presence of boulders, appeared to be the major determinants of occurrence and patch number, whereas biotic factors, such as interspecific competition and grazing, were more important ecological determinants underlying area and stem number per patch.

AB - Riparian habitats are particularly susceptible to invasion by non-native plants. At present, attempts to build consensus as to what the primary drivers of plant invasion in riparian ecosystems might be is hindered by the absence of common standards for data collected on plant species (e.g. occurrence, or relative abundance). Mimulus guttatus L., a non-native riparian plant species, was used as a model to determine how environmental drivers influence two aspects of invasibility: species occurrence and abundance (assessed in relation to three variables number of patches, patch area and number of stems per patch). Mimulus occurrence and abundance, together with 20 environmental variables, were surveyed in almost 700 contiguous 50-m-long riverbank segments within a catchment in north-east Scotland. More than half of the segments had been colonized by Mimulus. Occurrence and number of patches responded to similar environmental gradients, particularly bare sediment, boulders, high soil moisture, short-statured ruderal communities, and open canopies, and tended to be highest downstream where the river was widest. In contrast to occurrence and patch number, patch area and stem number per patch were higher in the upper reaches of the catchment and were positively associated with low tree canopy and vegetation dominated by light-demanding species and smaller-statured species. Patch area and stem number per patch were also positively related to grazing. This study has highlighted the importance of assessing more than one measure of invasion success (occurrence or patch number and either patch area or stem number per patch), as they are each determined by a different suite of environmental variables. Abiotic factors, such as sediment availability and presence of boulders, appeared to be the major determinants of occurrence and patch number, whereas biotic factors, such as interspecific competition and grazing, were more important ecological determinants underlying area and stem number per patch.

KW - alien

KW - biological invasions

KW - environmental drivers

KW - exotic species

KW - invasive species

KW - plant strategies

KW - species distribution

KW - principal-components-analysis

KW - plant invasions

KW - environmental-conditions

KW - seed dispersal

KW - Iberian River

KW - New-Zealand

KW - patterns

KW - management

KW - diversity

U2 - 10.1111/j.1472-4642.2007.00449.x

DO - 10.1111/j.1472-4642.2007.00449.x

M3 - Article

VL - 14

SP - 412

EP - 421

JO - Diversity and Distributions

JF - Diversity and Distributions

SN - 1366-9516

ER -