Pollination ecology of Penstemon roseus (Plantaginaceae), an endemic perennial shifted toward hummingbird specialization?

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AudienciaPúblico en generales_ES
CoberturaMéxicoes_ES
Fecha de ingreso2026-10-05T16:32:54Z
Fecha de publicación2008-01-01
ResumenPink-flowered tubular Penstemon roseus (Plantaginaceae), which has shifted partially to hummingbird pollination, blooms on high-elevation slopes in the mountains in Tlaxcala, Mexico. We studied the interactions between pollinator visitation rates to flowers, pollen removal and deposition, flower size, and nectar removal frequency on seed production in P. roseus. We combine observational and experimental studies in two contrasting natural populations. Our manual pollinations revealed that P. roseus is fully self-compatible. Autonomous self- and manual self-pollinated flowers matured as many seeds as when outcrossed, but outcrossing seems to become better than selfing as the flowering season progressed. Early in the season flowers that were bagged and hand-selfed, hand-outcrossed, or autonomously selfed, or unbagged and naturally pollinated had equal seed set in all four treatments. But later in the season, outcross pollen gave approximately twice as much seed set as the two self-treatments. Low levels of pollen receipt and pollen removal were consistent with the long time elapsed for a given plant to be visited by hummingbirds, which suggests pollen shortage in both sites. Despite differences in pollinator visitation rates to flowers, probability of flower visitation, removal and deposition of pollen, and nectar production rates between populations, we found that total nectar production had no effect on seed production at either site. The daily nectar secretion rate of 0.3-0.65 mg sugar per flower per 1-3 days was low relative to other hummingbird-adapted Penstemon species (typical range: 1.5-5 mg sugar per flower), and it might be intermediate between hummingbird- and bee-adapted Penstemon flowers. Our results support the hypothesis about a shift toward hummingbird pollination, and provide an example of a `despecialized' Penstemon species, which attracts high-energy pollinators (hummingbirds) and profits from outcrossing, but retains bee-syndrome floral traits and low sugar production rates.es_ES
Doihttps://doi.org/10.1007/s00606-007-0624-0es_ES
URIhttps://riuat.uat.edu.mx/handle/123456789/4707
Idiomaenes_ES
EditorialSPRINGER WIENes_ES
RelaciónPlant Systematics and Evolutiones_ES
URL relacionadohttps://doi.org/10.1007/s00606-007-0624-0es_ES
DerechosAcceso restringido / Suscripción (Metadatos de producción científica)es_ES
Licenciahttp://purl.org/coar/access_right/c_16eces_ES
FuentePlant Systematics and Evolution
Palabra claveMexicoes_ES
Palabra clavebreeding systemes_ES
Palabra clavehummingbirdses_ES
Palabra clavenectares_ES
Palabra clavepollen transferes_ES
Palabra clavePenstemones_ES
Palabra clavepollinationes_ES
Palabra clavePlantaginaceaees_ES
Palabra claveseed productiones_ES
TítuloPollination ecology of Penstemon roseus (Plantaginaceae), an endemic perennial shifted toward hummingbird specialization?es_ES
TipoArtículoes_ES
ArbitradoHa sido Arbitradoes_ES
AutorLara, C.
AutorOrnelas, J. Francisco
AutorLara, C.es_ES
AutorOrnelas, J. Franciscoes_ES
InstituciónUniversidad Autónoma de Tamaulipas
InstituciónUniversidad Autónoma de Tamaulipases_ES
Número3-4es_ES
Rango de páginas223-237es_ES
URL relacionadahttps://doi.org/10.1007/s00606-007-0624-0
Tipo de artículoIndexado
Tipo de artículoIndexadoes_ES
Volumen271es_ES

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