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Giraffes and the pollination ecology of knobthorns (Acacia nigrescens)

Giraffes (Giraffa camelopardalis) consume large quantities of knobthorn (Acacia nigrescens) flowers every year, and may be acting as pollinators. Because knobthorns flower in the late dry season, nutritionally a critical time of year for ungulates, the flowers are an important source of food for giraffes, especially since they are not physically protected against herbivory. Giraffes visit the flowering trees reliably year after year, carry pollen on their heads and necks, and cover large distances between knobthorns. In this study, conducted

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Giraffe feeding on Acacia flowers: predation or pollination?

Consumption of flowers by the following four browsing ruminant species was monitored for two years in a southern African savannah: giraffe (Giraffa camelopardalis Linnaeus), kudu (Tragelaphus strepsiceros Pallas), impala (Aepyceros melampus Lichtenstein) and steenbok (Raphicerus campestris Thunberg). Flowers of Acacia nigrescens Oliver are an important food resource to giraffe in the late dry season. This is not necessarily deleterious to the reproductive potential of the plant however, as most or all African Acacia species bear high proportions of sterile flowers.

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