Does florivory affect the attraction of floral visitors to buzz-pollinated Solanum rostratum?

Periodo de realización: 1900/01/01 al 2019/01/01

Tipo: Artículo científico

Lugar(es) de estudio: Puebla, Pue., México
Resumen: "Floral herbivory (forivory) can directly and indirectly afect plant reproduction through the loss of ovules or seeds andby reducing the visitation by pollinators through the reduction in fower attractiveness, respectively. We studied the efectof forivory on pollinator visitation in a buzz-pollinated herb. We used Solanum rostratum as the study model because itsspecialised morphology, heterantherous fowers that emit foral scents, demands a close association with its pollinators(buzzing bees). We hypothesized that when forivores consume the attractive structures (corolla and rewarding anthers), thepollinators would visit the damaged fowers less often, indirectly afecting S. rostratum reproductive success. Furthermore,we hypothesized that consumption of the reproductive structures (pollinating anther and pistil) would directly afect the plantsreproductive success. We conducted observations of three S. rostratum populations in central Mexico. We observed twelvespecies of forivore consuming S. rostratum fowers. Florivores preferred to consume the attractive structures (corolla) overreproductive structures. However, they preferred to consume the anthers specialised for feeding pollinators over the anthersspecialised for pollination. In addition, we recorded foral volatiles emitted by fowers damaged by forivory using solid-phasemicroextraction coupled with gas chromatography–mass spectrometry. We identifed 25 volatile compounds in S. rostratumfowers, mainly aromatic, monoterpene and sesquiterpene compounds. The relative proportions of these compounds diferedbetween undamaged and damaged fowers. Bioassays showed that both legitimate visitors (pollinators) and illegitimate visitors (thieves) visited undamaged fowers more often than fowers damaged by forivores"

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