Bush-encroaching sickle bush is preferred food of giraffes

Bush-encroaching sickle bush is preferred food of giraffes
Masai giraffes eat many species of woody plants, but they prefer eating sickle bush, a shrub disliked and removed by people with livestock. Credit: Wild Nature Institute

A native bush-encroaching shrub species called Sickle Bush (Dichrostachys cinerea) is disliked by livestock keepers and rangeland managers, but loved as forage by wild giraffes, according to research published this week in the Journal of Mammalogy.

The study, authored by Matana Levi, Master's student at the Nelson Mandela African Institution of Science and Technology in Arusha Tanzania, investigated woody plant species eaten by endangered Masai (Giraffa camelopardalis tippelskirchi) in the Tarangire Ecosystem of Tanzania, and compared use versus availability to determine preferences and avoidance.

The findings showed that giraffe significantly preferred foraging on bush-encroaching species such as the native Sickle Bush at local and landscape spatial scales and in both the wet and dry seasons. The results of this study suggest that browsing wildlife such as giraffes could be adversely affected by the removal of Sickle Bush from rangelands.

Recent rapid habitat changes and exploitation of natural resources by people have led to increased concerns about proper land management across Africa. In East African savannas, rangelands are often converted to farms, but sometimes rangelands see an expansion of native woody vegetation into previously open grass-dominated lands. Levi said, "Our data indicate against removal of Sickle Bush because endangered giraffes prefer to eat it. Managing mixed-use rangelands exclusively for grazing livestock would negatively impact browsing wildlife like giraffes."

Some land managers believe that a reduction of bush-encroaching species like D. cinerea is needed to maintain grazing resources for wildlife and livestock, but most studies have only examined how grazing species such as cattle and buffalo respond to a shift from grass-dominated to woody-dominated savanna. Before the current study, little was known about how increasing abundance of woody plants in a savanna might affect browsing species such as giraffes.

These new findings overturn most biologists and rangeland managers' traditional prejudices against the expansion of bush-encroaching species and efforts to maintain grazing lawns. Despite the negative attitudes of livestock managers towards woody species in rangeland ecosystems, these species contribute significantly to the quality and quantity of food for savanna browsers.

More information: Matana Levi et al, Forage selection by Masai giraffes (Giraffa camelopardalis tippelskirchi) at multiple spatial scales, Journal of Mammalogy (2022). DOI: 10.1093/jmammal/gyac007

Citation: Bush-encroaching sickle bush is preferred food of giraffes (2022, March 14) retrieved 31 May 2023 from https://phys.org/news/2022-03-bush-encroaching-sickle-bush-food-giraffes.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

Trailing giants: Clues to how people and giraffes can thrive together


Feedback to editors