origin of honeybees (apis mellifera l.) from the yucatan peninsula inferred from mitochondrial dna analysis.honeybees (apis mellifera l.) sampled at sites in europe, africa and south america were analysed using a mitochondrial dna restriction fragment length polymorphism (rflp) marker. these samples were used to provide baseline information for a detailed analysis of the process of africanization of bees from the neotropical yucatan peninsula of mexico. radical changes in mitochondrial haplotype (mitotype) frequencies were found to have occurred in the 13-year period studied. prior to the arrival of a ...200111412359
reproduction of varroa destructor in worker brood of africanized honey bees (apis mellifera).reproduction and population growth of varroa destructor was studied in ten naturally infested, africanized honey bee (ahb) (apis mellifera) colonies in yucatan, mexico. between february 1997 and january 1998 monthly records of the amount of pollen, honey, sealed worker and drone brood were recorded. in addition, mite infestation levels of adult bees and worker brood and the fecundity of the mites reproducing in worker cells were determined. the mean number of sealed worker brood cells (10,070 +/ ...200212593514
polliniferous plants and foraging strategies of apis mellifera (hymenoptera: apidae) in the yucatán peninsula, mexico.a study of the most important polliniferous plants for european and africanized honeybees (apis mellifera l.) was made in quintana roo state. comparisons were made between the plants visited by both bee types in order to determine whether there were qualitative or quantitative differences in their choice of plant species. also some foraging strategies of the honeybees were analysed. pollen from pollen load samples was acetolysed and mounted on slides. subsequently the pollen grains were identifi ...200212947587
reproductive biology of hechtia schottii, a dioecious bromeliaceae, in mexico.hechtia schottii is a terrestrial, rosetofilous, dioecious, polycarpic succulent herb, that grows mainly in shrubby associations, and less frequently, in secondary low caducifolious forests, both on calcareous soils or limestone outcrops in yucatan and campeche states, mexico. we studied phenology, floral and pollination biology, and breeding system at calcehtok, yucatan, during two flowering seasons. plants bloom mainly during the dry season (november-april) and disperse seeds during the rainy ...200818624243
transgenic soybean pollen (glycine max l.) in honey from the yucatán peninsula, mexico.using precise pollen species determination by conventional microscopic methods, accompanied by molecular genetic markers, we found bees collect gmo (genetically modified) soybean pollen and incorporate it in yucatan honey. honey comb samples from las flores, campeche, mexico, often contained soybean pollen. pollen in honey was analyzed in nine samples; six contained substantial soy pollen and two tested positive for soybean gmo. our analyses confirm field observations that honey bees, apis melli ...201424503936
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