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Effects of individual and population parameters on reproductive success in three sexually deceptive orchid species.

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Vandewoestijne, Sofie [UCL] Róis, Ana Sofia [Universidade Lusofona de Humanidades e Tecnologias, Lisboa, Portugal] Caperta, Ana [Centro de Botanica Aplicada a Agricultura, Instituto Superior de Agronomia, Lisboa, Portugal] Baguette, Michel [UCL] Tyteca, Daniel [UCL]

Reproductive success (RS) in orchids in general, and in non-rewarding species specifically, is extremely low. RS is pollinator and pollination limited in food deceptive orchids, but this has rarely been studied in sexually deceptive orchid species. Here, we tested the effects of several individual (plant height, inflorescence size, nearest neighbour distance and flower position) and population (patch geometry, population density and size) parameters on RS in three sexually deceptive Ophrys (Orchidaceae) species. Inter-specific differences were observed in RS of flowers situated in the upper versus the lower part of the inflorescence, likely due to species-specific pollinator behaviour. For all three species examined, RS increased with increasing plant height, inflorescence size and nearest neighbour distance. RS generally increased with decreasing population density and increasing patch elongation. Given these results, we postulate that pollinator availability, rather than pollinator learning, is the most limiting factor in successful reproduction for sexually deceptive orchids. Our results also suggest that olfactory 'display' (i.e. versus optical display), in terms of inflorescence size (and co-varying plant height), plays a key role in individual RS of sexually deceptive orchids. In this regard, several hypotheses are suggested and discussed.

Document type Article de périodique (Journal article) – Article de recherche – Journal Article, Research Support, Non-U.S. Gov't
Access type Accès restreint
Publication date 2009
Language Anglais
Journal information "Plant biology (Stuttgart, Germany)" - Vol. 11, no. 3, p. 454-63 (2009)
Peer reviewed yes
issn 1435-8603
Publication status Publié
Affiliations UCL - SC/BIOL - Département de biologie
UCL - SST/ELI/ELIB - Biodiversity
MESH Subject Smell ; Reproduction ; Pollination ; Phenotype ; Orchidaceae - anatomy & histology - physiology ; Fruit ; Flowers - anatomy & histology ; Animals
Keywords 3123
Links
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Bibliographic reference Vandewoestijne, Sofie ; Róis, Ana Sofia ; Caperta, Ana ; Baguette, Michel ; Tyteca, Daniel. Effects of individual and population parameters on reproductive success in three sexually deceptive orchid species.. In: Plant biology (Stuttgart, Germany), Vol. 11, no. 3, p. 454-63 (2009)
Permanent URL http://hdl.handle.net/2078.1/22460