Pollinators are important for the production of crops and other plants of economic and cultural value across the world. Shea fruits are consumed by local people in the sub-Saharan drylands of West Africa, and the oil “shea butter” produced from the seeds is both an important source of dietary fat and cosmetics, and a key tradable commodity in this region. However, the habitats in which shea trees grow are heavily modified by human activity, threatening the insect pollinators that this tree depends on. In this study, across six sites in southern Burkina Faso and northern Ghana, we found that shea flowers were mostly visited by bees, both small social stingless bees and native honey bees.
14 March, 2018
Insect pollination improves yield of Shea
Pollinators are important for the production of crops and other plants of economic and cultural value across the world. Shea fruits are consumed by local people in the sub-Saharan drylands of West Africa, and the oil “shea butter” produced from the seeds is both an important source of dietary fat and cosmetics, and a key tradable commodity in this region. However, the habitats in which shea trees grow are heavily modified by human activity, threatening the insect pollinators that this tree depends on. In this study, across six sites in southern Burkina Faso and northern Ghana, we found that shea flowers were mostly visited by bees, both small social stingless bees and native honey bees.
05 March, 2018
Floral larceny by a stingless bee on granadilla
Catalina
Gutiérrez-Chacón, Johanna Pantoja-Santacruz, Alexandra-Maria Klein
Trigona amalthea pierce holes in granadilla buds to primarily extract pollen, destroying styles, anthers and stigmas in the process. Photograph by C. Gutiérrez-Chacón. |
Flower visitors are considered pollinators when they successfully
transfer pollen from anthers to the stigmas. Animals, particularly bees, are
the main pollinators of wild and cultivated plants. However, animals may not
contribute to the pollination of plants when they act as robbers and thieves while
obtaining floral rewards (e.g., pollen and nectar). Robbers extract rewards by
making holes in buds, mature flowers or anthers without entering the flower. Thieves,
in contrast, collect rewards through the flower opening but transfer little or
no pollen, given a mismatch between the morphology or size of the flower and
that of the flower visitor. Robbery and thievery of nectar and pollen are
collectively referred as floral larceny.
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