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| Web URL(s): | http://www.jstor.org/stable/2433867
Last checked: 08/17/2012
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http://www.jstor.org/stable/pdfplus/2433867.pdf
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| Publication Type:
| Refereed |
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| Author(s): | Warwick, S. I.;
Briggs, D. |
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| Author Affiliation: | Botany School, Cambridge University, England |
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| Title: | Evidence for disruptive selection in Poa annua L. in a mosaic environment of bowling green lawns and flower beds |
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| Article Series: | The genecology of lawn weeds, part 2 |
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| Source: | New Phytologist. Vol. 81, No. 3, November 1978, p. 725-737. |
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| Publishing Information: | Oxford, England, United Kingdom: Blackwell Publishing, for the New Phytologist Trust |
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| # of Pages: | 13 |
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| Related Web URL: | http://www.jstor.org/stable/info/2433867
Last checked: 10/08/2013
Notes: Abstract only |
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| Keywords: | TIC Keywords: Bowling greens; Clippings; Dry weight; Growth factors; Mowing; Poa annua; Root weight
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| Abstract/Contents: | "In order to investigate the hypothesis that disruptive selection is acting on Poa annua L. populations within a mosaic environment of bowling greens and flower beds, two experimental approaches were employed. (1) Studies of samples of seedlings, raised from the seed present in soil and surface debris from the two bowling greens and one flower bed, established that in each site the seed population was more variable than the adult. This result is compatible with the notion of disruptive selection. (2) An experiment was set up to examine the response of the two growth forms to clipping and to estimate the effectiveness of clipping as a selective force in the bowling green environment. In the control (unclipped treatment), the erect and prostrate variants differed both in total production and in their relative energy allocation to both vegetative and floral reproduction. These differences have been discussed in relation to r and K selection strategies. Differential response to clipping was observed; the groups in descending order of relative fitness consisted of prostrate individuals from the two bowling green populations > prostrate individuals from the flower bed populations > erect individuals from flower bed populations. Clipping appears to have two effects on the erect forms resulting in: (1) a greater percentage decrease in total dry matter production in the erect compared with the prostrate forms, and (2) a greater percentage of the dry weight produced being removed by the cut in the erect forms compared with the prostrate forms. Coefficients of selection acting against erect plants under a regime of clipping ranged from 0.53 to 0.68. A selection coefficient of 0.77 was obtained for prostrate plants in the absence of clipping. In the light of the management of the lawns and flower beds, evidence for selection and gene flow is discussed." |
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| Language: | English |
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| References: | 19 |
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| See Also: | See also part 1 "Population differentiation in Poa annua L. in a mosaic environment of bowling green lawns and flower beds" New Phytologist, 81(3) November 1978, p. 711-723, R=5778. R=5778
See also part 3 "Cultivation experiments with Achillea millefolium L., Bellis perennis L., Plantago lanceolata L., Plantago major L., and Pruella vulgaris L. collected from lawns and contrasting grassland habitats" New Phytologist, 83(2) September 1979, p. 509-536, R=166958. R=166958
See also part 4 "Adaptive significance of variation in Bellis perennis L. As revealed in a transplant experiment" New Phytologist, 85(2) June 1980, p. 275-2288, R=166977. R=166977
See also part 5 "The adaptive significance of different growth habit in lawn and roadside populations of Plantago major L." New Phytologist, 85(2) June 1980, p. 289-300, R=166979. R=166979
See also part 6 "The adaptive significance of variation in Achillea millefolim L. as investigated by transplant experiments" New Phytologist, 85(3) July 1980, p. 451-460, R=166981. R=166981
See also part 7 "The response of different growth forms of Plantago major L. and Poa annua L. to simulated trampling" New Phytologist, 85(3) July 1980, p. 461-469, R=5753. R=5753 |
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| See Also: | Other items relating to: LAWNOS |
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| Note: | Summary as abstract
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Warwick, S. I., and D. Briggs. 1978. Evidence for disruptive selection in Poa annua L. in a mosaic environment of bowling green lawns and flower beds. New Phytol. 81(3):p. 725-737. |
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| Web URL(s):
http://www.jstor.org/stable/2433867
Last checked: 08/17/2012
Access conditions: Item is within a limited-access website
http://www.jstor.org/stable/pdfplus/2433867.pdf
Last checked: 08/17/2012
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2219226 |
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