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Scent variation and hybridization cause the displacement of a sexually deceptive orchid species

Title data

Stökl, Johannes ; Schlüter, Philipp M. ; Stuessy, Tod F. ; Paulus, Hannes F. ; Assum, Günter ; Ayasse, Manfred:
Scent variation and hybridization cause the displacement of a sexually deceptive orchid species.
In: American Journal of Botany. Vol. 95 (2008) Issue 4 . - pp. 472-481.
ISSN 1537-2197
DOI: https://doi.org/10.3732/ajb.95.4.472

Abstract in another language

In the sexually deceptive orchid genus Ophrys, reproductive isolation is based on the specific attraction of males of a single pollinator species, mostly bees, by mimicking the female sex pheromone of this species. Changes in the floral odor can lead to hybridization, introgression, and possibly speciation. We investigated hybrid swarms of O. lupercalis and O. iricolor on Sardinia using behavioral, electrophysiological (GC‐EAD), chemical, morphological, and genetic methods (AFLPs). In behavioral experiments, approximately 20% of the flowers from both species and hybrids were attractive to the “wrong” or both pollinator species. Analysis of the EAD‐active hydrocarbons in the floral odor showed an overlap in the two species, whereby hybrid individuals could not be separated from O. iricolor. The genetic analysis confirmed the hybridization of the species. Plants of O. iricolor and hybrids are genetically indistinguishable and form an O. iricolor × lupercalis hybrid population. Remaining plants of O. lupercalis will possibly be displaced by the O. iricolor × lupercalis hybrid population in the future. Our study showed that in deceptive orchids, variation in the pollinator attracting cues, in this case, scent, can be the first step for speciation and at the same time cause the displacement of a species.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER147303
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Animal Ecology II - Evolutionary Animal Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Animal Ecology II - Evolutionary Animal Ecology > Chair Animal Ecology II - Evolutionary Animal Ecology - Univ.-Prof. Dr. Sandra Steiger
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: No
DDC Subjects: 500 Science
Date Deposited: 15 Apr 2019 14:07
Last Modified: 15 Apr 2019 14:07
URI: https://eref.uni-bayreuth.de/id/eprint/48411