Monteverde Institute: Tropical Ecology and Conservation

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Publication Date

September 2000

Abstract

In tropical forests, plant species are sparsely distributed and in order to increase their probability of pollination they have developed bright, showy flowers that offer nectar to attract pollinators. In this study, I examined how the pollination rates are affected by the number of inflorescences present in patches of Habracanthus belpharohachis. In order to do this, I measured the percent of pollinated flowers from 22 small patches with one to five inflorescences, and flowers from 14 large patches with more than 15 inflorescences. I also recorded the number of visitations by the primary pollinator of H. belpharohachis, the Purple-throated Mountain-gem (Lampornis calolaema), along with two other hummingbird species to three different size patches of hummingbird feeders. Results showed a significantly greater percent of flowers were pollinated in large patches of H. belpharohachis than small patches. In addition, large patches of hummingbird feeders had significantly more visitations by all hummingbird species than small patches. This study showed that smaller patches of H. belpharohachis are less attractive than larger patches. In tropical forests, this behavior by pollinators may directly decrease the fitness of small patches.

Resumen

En el bosque tropical, las especies de plantas son poco densas y necesitan estrategias para mejorar su capacidad de reproducción. Una estrategia es tener las flores brillantes que producen néctar para atraer visitantes. En este estudio examiné como el número de inflorescencias de una parcela Habracanthus belpharohachis afecta la habilidad de la planta para atraer visitantes. Medí el porcentaje de polinizaciones de las flores en 22 parcelas pequeñas que tienen una a cinco inflorescencias, y 14 parcelas grandes tienen 15 o más inflorescencias. También observé cuantos colibríes visitaron a las parcelas con comederos de colibríes de tres tamaños. Los resultados indican que las flores tienen significativamente más polen en las parcelas grandes que en las parcelas pequeñas y había una diferencia significativamente en cuanto al número de visitantes a los comederos de colibríes. Las plantas pequeñas sufrían de menos habilidad para atraer polinizadores. La razón por esto es que las pequeñas tienen un grado más alto de reproducción con otros individuos que tienen diferente información genética.

Extent

12 pages

Holding Location

Monteverde Institute

Language

English; Spanish

Media Type

Articles

Format

Digital Only

Identifier

M39-00030

Type

Book

The effects of patch size on hummingbird visitation and pollination in Habracanthus Belpharohachis, September 2000

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