Elephant grazing reshapes rainforest bird communities, researchers find
Korejs K, Hořák D, Chmel K, Sedláček O, Motombi FN
Native Plants
The birds foraging on the forest floor beneath a canopy of trees you'd recognize from any tropical greenhouse, like figs and gingers, depend on megaherbivores like elephants to keep that understory open enough for them to hunt insects.
Scientists compared birds living in parts of a Cameroon rainforest that elephants regularly trample and graze versus areas elephants avoid, plus separate patches cleared by people. Surprisingly, elephant-grazed forest had fewer bird species overall, similar to human-damaged forest, but the birds that remained did a wider variety of jobs, like hunting insects on the ground instead of eating fruit high in the trees. The takeaway: losing elephants doesn't just remove one animal, it quietly rewires which birds can survive in the forest and how they make their living.
Key Findings
Elephant-grazed primary forest showed bird species richness comparable to heavily human-disturbed secondary forest, despite being otherwise intact.
Functional diversity (variety of feeding/foraging roles) increased in both elephant-grazed and secondary forest, but functional redundancy dropped, leaving fewer species backing up each ecological role.
Grazed forest favored understory and terrestrial invertivores (ground insect-eaters), while ungrazed forest supported frugivores and larger-bodied birds, and secondary forest hosted open-habitat species with high dispersal ability.
chevron_right Technical Summary
Forest elephants in Cameroon's rainforests act as ecosystem engineers whose grazing changes which birds live there, cutting the overall number of species while oddly increasing the diversity of feeding strategies present. Losing elephants would restructure bird communities much like human deforestation does, just through a different pathway.
Abstract Preview
Original paper
Megafaunal engineering in the tropical rainforest: African forest elephants (Loxodonta cyclotis) reduce avian species richness but elevate functional diversity.
African forest elephants (Loxodonta cyclotis) are critically endangered ecosystem engineers of African tropical forests. Despite their rapidly declining population trend, little is known of how for...
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