Introduced species make up about 15% of the flora of the Mount Holyoke Range, Hampshire County, Massachusetts, one of the core natural areas in the state. Geographic Information Systems software was used to compare the distribution of sample locations with introduced invasive species, introduced non-invasive species, or only native species as a function of distance from disturbance corridors that included roads and power-line right-of-ways. Habitat preferences were also analyzed for the two groups of introduced species. Thirty-nine percent of 475 geo-referenced sample locations had introduced species. Of these, twice as many had introduced non-invasive species as had introduced invasive species, with Poa compressa the most common species in the first group and Berberis thunbergii the most common in the second group. A high proportion of sample locations for both groups of introduced species were close to disturbance corridors, with about a third of the sample locations with these groups found within 50 m of disturbance corridors and most of the rest found within 300 m. The distributions of both groups of introduced species differed significantly from the distribution of native species, but not from each other. Disturbed habitats had the highest frequency of both groups of introduced species, but their relative frequency differed in other habitats. Introduced invasive species were common in moister habitats, which may restrict their spread in the range, while introduced non-invasive species tended to occupy drier habitats on upper slopes. These more open habitats may function as a refuge for some species in the introduced non-invasive group. However, high frequencies of both groups in disturbed habitats and the similarity in distribution suggests that human activities associated with disturbance corridors and past land use are of major importance in determining the distribution of both groups of introduced species across the landscape.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 108 • No. 933