Africanization of honey bees (Apis mellifera) in three climatic regions of northern Mexico

Carlos Aurelio Medina Flores; Ernesto Guzmán Novoa; M Hamiduzzaman; Jairo Ivan Aguilera Soto; Marco Antonio López Carlos

2015, Number 4

Vet Mex 2015; 2 (4)

**Africanization of honey bees (Apis mellifera) in three climatic regions of northern Mexico**

Medina FCA, Guzmán NE, Hamiduzzaman M, Aguilera SJI, López CMA

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ABSTRACT

This study was conducted to analyze the process of Africanization of managed honey bee (Apis mellifera) colonies by determining the frequency of African and European morphotypes and mitotypes (_>mtDNA) in three different ecological environments of northern Mexico. Colonies (n= 151) were sampled in 1) temperate semi-dry; 2) semi-warm semi-dry; and 3) temperate sub-humid regions in the state of Zacatecas. The _mtDNA type was determined by PCR-RFLP and the morphotype by the Fast Africanized Bee Identification System (FABIS). Out of all the colonies sampled in all areas, the _mtDNA analysis showed a significantly higher frequency of European maternal lineage (77.5%) than of African maternal lineage (22.5%; P ‹0.0001). The morphometric analysis classified 47% of the colonies as European and 42.4% of them as Africanized. The frequency of colonies with African or European mitotypes and morphotypes varied significantly between regions (P ‹0.05) with results indicating a higher degree of Africanization in the semi-warm semi-dry region. Conversely, the highest frequency of colonies with the European morphotype and mitotype occurred in the temperate semi-dry region. These results suggest that the environment affects the degree of Africanization of honey bee colonies in northern Mexico. Colonies established at higher altitudes and in more temperate climates have more European genotypes than colonies established in tropical regions. Several hypotheses are discussed to explain these results.

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