Deceit Pollination in the Monoecious, Neotropical Herb Begonia oaxacana (Begoniaceae)

Schemske, Douglas W.; Ågren, Jon; Corff, Josiane Le

doi:10.1007/978-1-4613-1165-2_11

Cited by 47 publications

(51 citation statements)

References 33 publications

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“…In the Cucurbitaceae and in species of Begonia (Begoniaceae) the stigmas of the pistillate flowers resemble an androecium (Vogel 1978) (Figs. 6, 10), so that although these flowers offer only nectar, or in some cases neither nectar nor pollen, pollinators are deceived into visiting them by this imitation of the stamens of staminate flowers (Agren and Schemske 1991, Schemske and Agren 1995, Schemske et al 1996. Dukas (1987) observed that honeybees clearly prefer the staminate flowers of Ecballium elaterium (Cucurbitaceae), whereas solitary bees visit staminate and pistillate flowers with equal frequency .…”

Section: Melampyrum Prat Ense Mimulus Guttatus)mentioning

confidence: 99%

The ecology and evolution of visual pollen signals

Lunau

2000

Pollen and Pollination

135

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Abstract. By offering pollen and /or nectar as a food resource , angiosperms exploit flower visitors for pollen transport. Pollen thus acts not only as a means for transportation of male gametes, but also as a food reward for potential pollinators. Many findings provide compelling evidence that pollen acts, in addition, as a visual signal. The present contribution reviews several strategies that angiosperms have evolved to attract potential pollinators to the site of reward . We here consider evolutionary, ecological, sensory-physiological, and behavioural aspects of flower-pollinator interactions that are correlated with visual signals provided by pollen and pollen-producing organs, or imitations thereof.

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Section: Melampyrum Prat Ense Mimulus Guttatus)mentioning

confidence: 99%

The ecology and evolution of visual pollen signals

Lunau

2000

Pollen and Pollination

135

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“…Most research on the evolution of floral traits that function directly in pollination has focused on flower diameter, shape, colour, or nectar production (Schemske and Horwitz 1989;O'Connell and Johnston 1998;Totland and Sandvik 2000). The likelihood of selection on such floral traits has been pointed out in several studies (Campbell 1989(Campbell , 1996Galen 1989Galen , 1996Schemske and Horwitz 1989;Widén 1991;Herrera 1993;Mitchell 1994;Conner et al 1996;Schemske et al 1996;Mitchell et al 1998;O'Connell and Johnston 1998;Totland et al 1998;Armbruster et al 2000;Maad 2000;Totland 2001). Few studies have, however, focused on the evolution of stamen morphology or function in relation to the quality and quantity of pollinator visitation (but see Harder and Barrett 1993;Harder and Barclay 1994;Buchman 1995, 1996;Walker-Larsen and Harder 2001).…”

Section: Introductionmentioning

confidence: 97%

Quantitative importance of staminodes for female reproductive success inParnassia palustrisunder contrasting environmental conditions

Sandvik¹,

Totland²

2003

Can. J. Bot.

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Abstract:The five sterile stamens, or staminodes, in Parnassia palustris act both as false and as true nectaries. They attract pollinators with their conspicuous, but non-rewarding tips, and also produce nectar at the base. We removed staminodes experimentally and compared pollinator visitation rate and duration and seed set in flowers with and without staminodes in two different populations. We also examined the relative importance of the staminode size to other plant traits. Finally, we bagged, emasculated, and supplementary cross-pollinated flowers to determine the pollination strategy and whether reproduction was limited by pollen availability. Flowers in both populations were highly dependent on pollinator visitation for maximum seed set. In one population pollinators primarily cross-pollinated flowers, whereas in the other the pollinators facilitated self-pollination. The staminodes caused increased pollinator visitation rate and duration to flowers in both populations. The staminodes increased female reproductive success, but only when pollen availability constrained female reproduction. Simple linear regression indicated a strong selection on staminode size, multiple regression suggested that selection on staminode size was mainly caused by correlation with other traits that affected female fitness.Key words: staminodes, insect activity, seed set, spatial variation, Parnassia palustris. Résumé :Chez le Parnassia palustris, les cinq étamines stériles, ou staminodes, agissent à la fois comme fausses et véritables nectaires. Elles attirent les pollinisateurs avec leurs extrémités bien visibles mais non-gratifiantes, et elle produisent également du nectar à la base. Les auteurs ont éliminé expérimentalement les staminodes, et ils ont comparé les taux et la durée des visites par les pollinisateurs, ainsi que la mise à graine, chez des fleurs avec ou sans staminodes, dans deux populations distinctes. Ils ont également examiné l'importance relative de la dimension des staminodes par rapport à d'autres caractères de la plante. Enfin, ils ont mis en sachet, émasculé et assisté la pollinisation croisée de fleurs afin de déterminer la stratégie de pollinisation et si la reproduction est limitée par l'abondance du pollen. Dans les deux populations, les fleurs dépendent fortement de la visite des pollinisateurs pour maximiser la mise à graine. Dans une population, les pollinisateurs ont surtout effectué la pollinisation croisée, alors que dans l'autre les pollinisateurs ont facilité l'auto-pollinisation. Les staminodes entraînent une augmentation du taux et de la durée des visites des fleurs dans les deux populations. Les staminodes augmentent les succès de la reproduction femelle, mais seulement lorsque la disponibilité du pollen limite la reproduction femelle. La régression linéaire simple indique une forte sélection sur la base de la dimension des staminodes, et la régression multiple suggère que la sélection basée sur la dimension des staminodes provient principalement d'une corrélation avec d'autres caractères q...

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“…flower colour (Kay 1978;Waser and Price 1981;Stanton 1987), size (Bell 1985;Eckhart 1991;Conner and Rush 1996), nectar production (Mitchell 1994), floral morph in heterostylous species (Wolfe and Barrett 1987;Husband and Barrett 1992), and gender in unisexual species (Kay et al 1984;Ågren et al 1986;Bierzychudek 1987;Eckhart 1991;Schemske et al 1996). Insect visitation may also be significantly influenced by the spatial and temporal arrangement of flowers in the floral display (Handel 1985;Cruzan et al 1988;Schmid-Hempel and Speiser 1988;Thomson 1988;Klinkhamer et al 1989;Klinkhamer and de Jong 1990;Eckhart 1991;de Jong and Klinkhamer 1994) and in a given neighbourhood (Klinkhamer et al 1989;Feinsinger et al 1991;Kunin 1993).…”

Section: Introductionmentioning

confidence: 99%

How do visitation patterns vary among pollinators in relation to floral display and floral design in a generalist pollination system?

2001

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Diverse pollinator assemblages may impose complex selection and thus limit specialisation to particular pollinators. Previous work has concentrated on how visitation rates of different pollinators vary in space and time and how pollinators may vary in efficiency. In this study I quantify variation in visitation rates and foraging behaviour of different insect types (1) in space and time and (2) in relation to variation in floral design (flower size and form) and floral display (number of open flowers) for the distylous clonal shrub Jasminum fruticans. Mean visitation rate showed a significant interaction between insect type and population for seven populations in one year, and between insect types and years for a single population over 3 years. There was also a significant interaction between insect type and population for the proportion of flowers visited. In general the number of visits was positively related to the number of open flowers in a patch, but analyses by insect type showed that this was only true for bee flies and butterflies. Short-tongued bees showed a positive relationship between visitation rate and the number of open flowers on the focal stem, and hawkmoths and butterflies made more visits to plants with larger flowers. Hawkmoths were the only insect type to show a positive relation between the number of flowers visited per foraging bout and flower size. The significant differences between different insect types in patterns of variation in visitation rates in response to floral design and display may act to diversify selection on floral traits, and thereby constrain specialisation of the plant to particular pollinators.

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Deceit Pollination in the Monoecious, Neotropical Herb Begonia oaxacana (Begoniaceae)

Cited by 47 publications

References 33 publications

The ecology and evolution of visual pollen signals

The ecology and evolution of visual pollen signals

Quantitative importance of staminodes for female reproductive success inParnassia palustrisunder contrasting environmental conditions

How do visitation patterns vary among pollinators in relation to floral display and floral design in a generalist pollination system?

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