Researchers investigated how environmental conditions shape the evolution of gut bacteria in wild African herbivores. They worked in Etosha National Park, Namibia, a relatively dry ecosystem, and collected fresh feces from 11 herbivore species. The samples came from animals such as African elephants, Angolan giraffes, wildebeests, two zebra species and several antelope species. DNA extraction and sequencing were used to identify the bacterial taxa and their relative abundances in each sample.
The study tested for phylosymbiosis, the expectation that related host species harbour similarly related gut microbial communities. Results revealed a contrast across species: six species showed little or no evidence of phylosymbiosis, while five species displayed patterns consistent with it. Those five species are:
- red hartebeest
- blue wildebeest
- gemsbok
- impala
- springbok
All five are bovids, a closely related group of ruminant, cow-like herbivores with complex stomachs, so the finding aligns with shared evolutionary history. The authors note that earlier work in more temperate African ecosystems did not find phylosymbiosis among bovids. They suggest local environment can mask or reveal such patterns: wetter areas with diverse vegetation may support greater gut microbial diversity and create background variation, while dry sites like Etosha may remove microbes not well adapted to the hosts or limited vegetation, making host-related patterns easier to detect. The team adds this pattern may be particularly clear for bovids and could matter as many ecosystems become drier with human-mediated climate change. The paper appears in BMC Ecology and Evolution, with additional coauthors from Etosha Ecological Institute and the University of Georgia.
Difficult words
- phylosymbiosis — when related host species have similar microbial communities
- taxon — a group used to classify organismstaxa
- abundance — the amount or proportion of something presentrelative abundances
- ruminant — mammal with a multi-chambered stomach
- ecosystem — all living things and their environment in an areaecosystems
- diversity — the range of different species or types
- adapt — change to become suited to an environmentadapted
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- How could increasing dryness from climate change affect studies of animal gut microbes and their interpretation? Give reasons.
- Why might wetter areas with diverse vegetation hide host-related microbial patterns compared with dry areas?
- How could the finding that bovids show phylosymbiosis in a dry park influence conservation or research priorities there?
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