Biogeography from a food matrix: a temporal distribution map of Apis mellifera mitochondrial DNA lineages across Italy, obtained from honey samples.

For honey samples with the A lineage, longitude was not a significant predictor for samples produced in 2018, whereas it was highly significant in all other years.

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This suggests an increasing trend over time in beekeepers submitting honey samples with multiple lineages, indicating increased diversity in the honey samples and implying that their apiaries became more heterogeneous in terms of mtDNA lineages.

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