Pollination efficiency of Chalicodoma cincta (Fabricius) (Hymenoptera: Megachilidae) on Cajanus cajan (L.) Millsp. (Fabaceae) flowers at Doyaba (Sarh, Chad)

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Pollination efficiency of Chalicodoma cincta (Fabricius) (Hymenoptera: Megachilidae) on Cajanus cajan (L.) Millsp. (Fabaceae) flowers at Doyaba (Sarh, Chad)

Clautin Ningatoloum, Guiguindibaye Madjimbe, Sidonie Fameni Tope, Fernand-Nestor Tchuenguem Fohouo
J. Bio. Env. Sci.14( 1), 15-25, January 2019.
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To evaluate Chalicodoma cincta impact on pod and seed yields of Cajanus cajan, its foraging and pollinating activities were studied in Doyaba, during the rainy season of 2015 and 2016. Each year, treatments included flowers accessible to all visitors, bagged flowers to avoid insect visitors, bagged  flowers using gauze bags destined to be visited exclusively by C. cincta and bagged flowers destined to opening and closing without the visit of insects or any other organism. For each year of study, observations were made on 1028 ± 90 flowers per treatment. Chalicodoma cincta daily rhythm of activity, its foraging behaviour on flowers and its pollination efficiency were evaluated. On flowers, individual bees intensely harvested exclusively nectar. The fruiting rate, the number of seeds per pod and the percentage of normal seeds of unprotected flowers were significantly higher than those of flowers protected from insects. Through its pollination efficiency, C. cincta provoked a significant increment of the fruiting rate by 21.40% and 7.55%, the number of seeds per pod by 16.69% and 14.96% and the percentage of normal seeds by 32.95% in 2015 and 36.30% in 2016 respectively. The Conservation of C. cincta nests close to C. cajan fields is recommended to improve pod and seed productions in the region.


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