Free Access
Volume 28, Number 1, 1997
Page(s) 11 - 16
Apidologie 28 (1997) 11-16
DOI: 10.1051/apido:19970102

Pollination efficiency of native and invading Africanized bees in the tropical dry forest annual plant, Kallstroemia grandiflora Torr ex Gray

M. Osorio-Beristain, C.A. Domínguez, L.E. Eguiarte and B. Benrey

Instituto de Ecología, Departamento de Ecología Evolutiva, Universidad Nacional Autónoma de México, AP 70-275 México City, DF 04510, Mexico

Abstract - We compared the pollinator effectiveness of native and exotic bees on Kallstroemia grandiflora in a tropical dry forest in Mexico. Although exotic Apis mellifera transfer 2.5 times less pollen grains on a per visit basis, they visited the flowers 2.65 times more frequently than the native bee Trigona nigra. Thus, when all measures of pollinator effectiveness are combined, exotic bees appear to be as efficient pollinators as native bees.

Key words: Africanized bee / Apis mellifera / Kallstroemia / pollination efficiency / Trigona / tropical dry forest