Silvertown, Jonathan; Francisco-Ortega, Javier and Carine, Mark
(2005).
| DOI (Digital Object Identifier) Link: | http://dx.doi.org/doi:10.1111/j.1365-2745.2005.01038.x |
|---|---|
| Google Scholar: | Look up in Google Scholar |
Abstract
It has been argued that niche pre-emption is not the only possible explanation for monophyly among Macaronesian endemic plants because (i) interspecific competition is diffuse, not species-specific, (ii) the radiations in question may not in fact be monophyletic, and (iii) later colonists may have hybridized with earlier ones, making a small and undetected contribution to the gene pool of lineages that appear to be monophyletic. The niche pre-emption mechanism does not, however, require species-specific competitive interactions. It merely proposes that the clade created by adaptive radiation will occupy more niche space than the original colonist could on its own. Members of the clade will then collectively inhibit establishment by new colonists more effectively than can a colonist that has not radiated. The monophyly of many larger radiations in the Macaronesian flora is well established and new studies tend to confirm this pattern. A few later-arriving colonists may have undetectably hybridized with earlier arrivals, but this is only a genetic interpretation of the essential idea behind pre-emption, i.e. that early arrivals so outnumber later colonists that the latter cannot establish. We do not therefore believe that hybridization provides an alternative explanation of why groups with multiple colonization failed to radiate in Macaronesia.
| Item Type: | Journal Article |
|---|---|
| ISSN: | 0022-0477 |
| Extra Information: | The definitive version is available at www.blackwell-synergy.com
---Visit the author's website at: http://www.open.ac.uk/science/biosci/personalpages/j.silvertown/index.htm |
| Keywords: | Macaronesia; phylogeny; adaptive radiation; niche pre-emption nuclear ribosomal dna; internal transcribed spacers; adaptive radiation; molecular evidence; canary-islands; pericallis asteraceae; phylogeny; hybridization; sequences; origin |
| Academic Unit/Department: | Science > Environment, Earth and Ecosystems |
| Interdisciplinary Research Centre: | Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR) |
| Item ID: | 2301 |
| Depositing User: | Jonathan Silvertown |
| Date Deposited: | 12 Jun 2006 |
| Last Modified: | 21 Oct 2011 08:26 |
| URI: | http://oro.open.ac.uk/id/eprint/2301 |
Actions (login may be required)
| View Item | |
| Public: Report issue / request change |