If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

The evolutionary basis of reproductive isolation in Mediterranean orchids

$17.95 plus tax (Refund Policy)

Buy Article:


The extraordinary floral diversity in orchids reflects the importance of orchid-pollinator associations in orchid evolution, and pollination biology is regarded as a driving force in orchid diversification and speciation. As a consequence, a prominent role has been attributed to the specificity of orchid-pollinator associations and to pollinator mediated pre-mating barriers for maintaining reproductive isolation among orchid species. Changes in floral morphology, coloration or odor may lead to the attraction of different pollinators and to the occupation of different ethological niches. Although this concept is appealing, it does not find strong support in Mediterranean orchids, subtribe Orchidinae, where phylogenetic studies have revealed that speciation is not strictly associated with shifts in pollination biology and where numerous literature reports described the wide occurrence of hybridization. Most Mediterranean orchids are food-deceptive, by generally mimicking rewarding plants, and the low specificity of this pollination strategy is the main cause of the observed hybridization. Genetic analyses of hybrid zones have revealed that most hybrid individuals were first generation hybrids. These findings, together with the absence of polyploid chromosome numbers, suggest that hybridization is of limited importance as basis for speciation in Mediterranean orchids. However, strong karyotype differences between closely related species that share pollinators, suggest that chromosomal changes play a prominent role in reducing hybrid fitness and maintaining reproductive isolation among sympatric Mediterranean orchid species.


Document Type: Research Article

Affiliations: 1: Dipartimento delle Scienze Biologiche, Università degli Studi di Napoli Federico II, Via Foria, 223, I-80139 Naples, Italy 2: Geobotanisches Institut, ETH Zürich, Universitätsstr. 16, CH-8008 Zürich, Switzerland

Publication date: November 1, 2005

Related content



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more