No evidence for a role of competitive capabilities of adults in causing habitat segregation of diploid and hexaploid Senecio carniolicus (Asteracaeae)
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- 作者：Karl Hülber (1) (2)
Andreas Berger (3)
Christian Gilli (3)
Markus Hofbauer (3)
Monika Patek (2)
Gerald M. Schneeweiss (3) - 关键词：Polyploidy ; Competition ; Alpine plants ; Biomass ; Vegetation cover
- 刊名：Alpine Botany
- 出版年：2011
- 出版时间：October 2011
- 年：2011
- 卷：121
- 期：2
- 页码：123-127
- 全文大小：1658KB
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Andreas Berger (3)
Christian Gilli (3)
Markus Hofbauer (3)
Monika Patek (2)
Gerald M. Schneeweiss (3)
1. Vienna Institute for Nature Conservation & Analyses, Giessergasse 6/7, 1090, Vienna, Austria
2. Department of Conservation Biology Vegetation and Landscape Ecology, University of Vienna, Rennweg 14, 1030, Vienna, Austria
3. Department of Systematic and Evolutionary Botany, University of Vienna, Rennweg 14, 1030, Vienna, Austria
文摘
Hexaploid individuals of Senecio carniolicus (Asteraceae) predominantly occur in dense swards while diploids prevail in open vegetation. We test whether this habitat segregation is due to differential responses to competition. Linear regression models were used to relate biomass and maximum leaf length of adults to vegetation cover within radii of 20?cm around target individuals. Biomass differed between ploidy levels, but was independent from vegetation cover in both cytotypes. Maximum leaf length of diploids increased with vegetation cover, but remained constant in hexaploids. This suggests that at the adult stage diploids respond to increasing competition by changes in plant architecture rather than changes in resource utilization, while hexaploids are unaffected by competition. Consequently, other factors, such as competitive interactions at earlier life stages, likely are responsible for habitat segregation of diploid and hexaploid S. carniolicus.