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| Web URL(s): | http://www.jstor.org/stable/pdf/3072256.pdf
Last checked: 10/06/2015
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| Publication Type:
| Refereed |
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| Author(s): | Kolb, A.;
Alpert, P.;
Enters, D.;
Holzapfel, C. |
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| Author Affiliation: | Kolb: Plant Biology Graduate Program; Alpert: Plant Biology Graduate Program, Department of Biology; Enters: Department of Plant and Soil Sciences; Holzapfel: Department of Biology, University of Massachusetts, Amherst, Massachusetts |
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| Title: | Patterns of invasion within a grassland community |
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| Source: | Journal of Ecology. Vol. 90, No. 5, October 2002, p. 871-881. |
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| Publishing Information: | Blackwell Scientific Publications |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Weed invasion; Grasslands; Microhabitats; Competition; Native grasses; Lolium multiflorum; Hordeum brachyantherum
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| Geographic Terms: | California |
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| Abstract/Contents: | "Relatively few studies have looked for patterns of invasion by non-native species within communities. We tested the hypotheses that: (i) some types of microhabitats within a community are more invasible than others; (ii) microhabitat types that differ in invasion also differ in resource availability; and (iii) invasibility is mediated by effects of these resources on competition between native and non-native species. To test the first two hypotheses, we measured plant cover and soils in a coastal grassland in northern California. Consistent with these hypotheses, cover of non-native plants was consistently high where nitrogen-fixing shrubs had recently grown, in the bottoms and sides of gullies and on deep soils, and these microhabitats tended to have relatively high nitrogen or water availability. Cover and number of native species tended to be lower where cover of non-native species was higher, indicating that non-native species as a group negatively affected native species. However, the number of non-native species also tended to be lower where the total cover of non-natives was higher. This suggests that a few non-native species excluded natives and other non-natives alike. To test the third hypothesis, we grew a common non-native, the annual grass Lolium multiflorum, and a common native, the perennial grass Hordeum brachyantherum, at different levels of water and nitrogen. The relative competitive ability of the native was higher at lower nitrogen availability but not at lower water availability. When 10-week-old native plants were grown with non-native seedlings and nitrogen was relatively low, the native out-competed the non-native. However the non-native out-competed the native at all resource levels when species were both grown as seedlings. Competition between native and non-native grasses in this system may thus help prevent invasion by non-natives in microhabitats where nitrogen availability is low, but invasion may be relatively irreversible." |
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| Language: | English |
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| References: | 35 |
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| Note: | Graphs
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kolb, A., P. Alpert, D. Enters, and C. Holzapfel. 2002. Patterns of invasion within a grassland community. J. Ecol. 90(5):p. 871-881. |
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| Web URL(s):
http://www.jstor.org/stable/pdf/3072256.pdf
Last checked: 10/06/2015
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: QH 540 .J6 |
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