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Oxpecker (Buphagus erythrorhynchus, Buphagus africanus) and tick abundances in acaricide‐treated livestock areas

Since the introduction of acaricides a century ago, their widespread use has enhanced cattle production throughout the world by controlling tick infestations on domestic livestock. Early arsenical and organochlorine acaricides improved overall cattle health but were toxic to oxpeckers (Buphagus spp.), birds endemic to sub‐Saharan Africa which eat ticks on domestic and wild ungulates (Stutterheim, 1982; Stutterheim & Brooke, 1981). Following the introduction of these acaricides, oxpecker populations declined significantly, though this trend was reversed as target‐specific acaricides increased in use

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Enough is enough: The effects of symbiotic ant abundance on herbivory, growth, and reproduction in an African acacia

Understanding how cooperative interactions evolve and persist remains a central challenge in biology. Many mutualisms are thought to be maintained by ‘‘partner fidelity feedback,’’ in which each partner bases their investment on the benefits they receive. Yet, we know little about how benefits change as mutualists vary their investment, which is critical to understanding the balance between mutualism and antagonism in any given partnership. Using an obligate ant–plant mutualism, we manipulated the density of symbiotic acacia ants (Crematogaster mimosae) and

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