Competition between cytotypes changes across a longitudinal gradient inCentaurea stoebe(Asteraceae)
| Autor: | Alexandra R. Collins, Ruhollah Naderi, Heinz Mueller-Schaerer |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
0106 biological sciences
Sympatry Time Factors Range (biology) media_common.quotation_subject Population Dynamics Centaurea Plant Science Biology Plant Roots 010603 evolutionary biology 01 natural sciences Competition (biology) Polyploidy Polyploid Genetics Biomass Ecology Evolution Behavior and Systematics media_common Ecotype Analysis of Variance Biomass (ecology) Geography Ecology fungi food and beverages 15. Life on land Asteraceae biology.organism_classification Europe Logistic Models Seeds Ploidy Centaurea stoebe Plant Shoots 010606 plant biology & botany |
| Zdroj: | American Journal of Botany. 98:1935-1942 |
| ISSN: | 0002-9122 |
| DOI: | 10.3732/ajb.1100063 |
| Popis: | Premise of the Study: Polyploidy resulting from whole genome duplication has contributed to the adaptive evolution of many plant species. However, the conditions necessary for successful polyploid evolution and subsequent establishment and persistence in sympatry with diploid progenitors are often quite limited. One condition thought to be necessary for establishment is a substantial competitive superiority of the polyploid. Methods: We conducted a pairwise competition experiment using diploid and tetraploid cytotypes of Centaurea stoebe L. to determine whether (1) tetraploids have greater competitive ability than diploids, (2) cytotypes from mixed-cytotype populations have more balanced competitive abilities than single-cytotype populations, and (3) competitive abilities change along a longitudinal gradient. Key Results: Across sampling localities, tetraploids did not produce greater aboveground biomass than diploids but suffered from greater intracytotypic competition. Tetraploids allocated greater biomass belowground than diploids, regardless of competition treatment, and had greater performance for traits associated with long-term persistence (bolted more frequently and produced more accessory rosettes). Competitive ability of tetraploids did not differ between single- and mixed-cytotype populations but varied along a longitudinal gradient. Tetraploids were stronger intercytotypic competitors in Western Europe (Switzerland and Germany) than in Eastern Europe (Hungary and Slovakia), which indicates that cytotype coexistence may be more likely in Eastern Europe, the proposed origin of tetraploids, than in Western Europe. Conclusions: Our study addresses the importance of examining competitive interactions between cytotypes across their distributional range, as competitive interactions were not consistent across sampling localities. |
| Databáze: | OpenAIRE |
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