Pollination efficiency of Xylocopa olivacea (Hymenoptera: Apidae) on Cajanus cajan (Fabaceae) flowers at Yaoundé, Cameroon

To assess the impact of the carpenter bee, Xylocopa olivacea Fabricius 1787, on the pod and seed yields of Cajanus cajan (L.) Millsp. 1900, in this study, its foraging and pollinating activities were examined in Nkolbisson during two seasons (July 2008–January 2009 and June–December 2009). Observati...

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Bibliographic Details
Published in:International journal of tropical insect science 2014-06, Vol.34 (2), p.138-148
Main Authors: Fohouo, Fernand-Nestor Tchuenguem, Pando, Joseph Blaise, Tamesse, Joseph Lebel
Format: Article
Language:English
Subjects:
Apidae
Apis mellifera
Biomedical and Life Sciences
Cajanus cajan
Crop yield
Entomology
Fabaceae
Flowers
Foraging behavior
Hymenoptera
Insects
Life Sciences
Megachile
Pollen
Pollination
Research Paper
Research Papers
Seeds
Xylocopa
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Summary:To assess the impact of the carpenter bee, Xylocopa olivacea Fabricius 1787, on the pod and seed yields of Cajanus cajan (L.) Millsp. 1900, in this study, its foraging and pollinating activities were examined in Nkolbisson during two seasons (July 2008–January 2009 and June–December 2009). Observations were made on 180 inflorescences per treatment. The treatments included unlimited floral access to all visitors, bagging of flowers to prevent access to all visitors, and floral access to limited visits by X. olivacea only. In addition, information on all floral visitors was recorded. The carpenter bee's seasonal rhythm of activity, its foraging behaviour on flowers, its pollination efficiency, the fruiting rate (Fr) and the number of seeds per pod were recorded. Nineteen species of insects were recorded visiting the flowers of C. cajan.Chalicodoma cincta cincta was the most prominent one, followed by X. olivacea, Apismellifera adansonii, Megachile bituberculata and Xylocopa albiceps, and the bees were the most frequent floral visitors. Xylocopa olivacea mainly foraged for nectar and pollen and its foraging speed was 11.75 flowers/min. The Fr, the number of seeds/pod and the percentage of normal seeds of unprotected inflorescences were significantly higher than those of inflorescences protected from insects. The foraging activity of X. olivacea resulted in a significant increase in the Fr by 22.26%, as well as the number of seeds/pod by 34.98% and the percentage of normal seeds by 12.09% in the two study years. Placing X. olivacea nests close to C. cajan fields is recommended to increase pod and seed production in Cameroon.
ISSN:1742-7584
1742-7592
DOI:10.1017/S1742758414000307