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Brassica napus --- Yields --- Pollination --- Apis mellifera --- Mortality

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Apis mellifera --- Apis mellifera --- Bombus --- Bombus --- Zoology --- Zoology --- animal ecology --- animal ecology --- identification. --- identification --- Biogeography --- Biogeography

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Bombus --- Apis mellifera --- Arbutus --- Nectar --- Pollen --- Amino acids --- Sterols --- Metabolism

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Apis mellifera adansonii --- Apis mellifera adansonii --- apiculture. --- apiculture --- Animal diseases --- Animal diseases --- Parasitoses --- Parasitoses --- Biodiversity --- Biodiversity --- Pollination --- Pollination --- production possibilities --- production possibilities --- Honey production --- Honey production --- Benin. --- Benin

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Apis mellifera --- Apis mellifera --- pesticides --- pesticides --- Organic halogen compounds --- Organic halogen compounds --- toxicity --- toxicity --- Quantitative analysis --- Quantitative analysis --- Sampling --- Sampling --- Extraction --- Extraction --- Chromatography --- Chromatography --- methodology --- methodology