Producción Científica Profesorado

The effect of spatio-temporal variation in understanding the fruit crop size hypothesis



Ortiz Pulido, Raúl

2000

Ortiz-Pulido, R. y V. Rico-Gray. 2000. The effect of spatio-temporal variation in understanding the fruit crop size hypothesis. Oikos 93: 523-528. DOI: 10.1034/j.1600-0706.2000.910314.x


Abstract


In order to evaluate the fruit crop size hypothesis, we analyzed the effect of fruit availability on the number of visits by birds and on the proportion of removed fruits, and on how much of the variation in the proportion of removed fruits could be explained by spatio-temporal variability. Fieldwork was done on the coast of the state of Veracruz, Mexico, using the small tree Bursera fagaroides (Burseraceae) and its frugivorous feeding assemblage, on four hills during four years. The number of fruits produced, the number of visits by birds, and the proportion of removed fruits varied between years with more than half an order of magnitude. The number of available fruits was associated to both the number of visits by birds and the proportion of fruits removed from each plant individual, and supports the fruit crop size hypothesis. However, the hypothesis varies in strength depending on total fruit production by the population per year and per hill. The spatio-temporal variation of the system was the effect of variation in the intensity of fructification between years and hills; the inclusion of spatio-temporal variability helped to explain most of the variation found in our results. The latter approach may explain the explain the conflicting results found by other authors in studies done in only one year or at one site, where variation is greatly reduced. Considering the number of published reports, a meta-analysis seems to be in order to determine the existence of a general effect between fruit production, the number of visits by birds and the proportion of fruits removed. If this is possible, we hypothezise that the association between fruit production and the number of visits by birds should be of low intensity.



Producto de Investigación




Artículos relacionados

A female Lucifer Hummingbird (Calothorax lucifer) with iridescent chin feathers

Abundance of frugivorous birds and richness of fruit resource: is there a temporal relationship?

DISTRIBUCIÓN DE COLIBRÍES EN LA ZONA BAJA DEL CENTRO DE VERACRUZ, MÉXICO

Influence of slope orientation on sex ratio and size distribution in a dioecious plant Bursera fagar...

Patterns of resource tracking by avian frugivores at multiple spatial scales: two case studies on di...

The relationship between bark peeling rate and the distribution and mortality of two epiphyte specie...

Epiphyte Orchid Establishment on Termite Carton Trails

EXPLORANDO LA RELACIÓN ENTRE REGISTROS DE COLIBRÍES Y ABUNDANCIA DE FLORES CON ESCALAMIENTO ESPACIO-...

The effect of spatio-temporal variation in understanding the fruit crop size hypothesis

UN PANORAMA BREVE DE LA HISTORIA DE LA ORNITOLOGÍA MEXICANA