Divergent water requirements partition exposure risk to parasites in wild equids

Kaia Tombak, Laurel Easterling, Lindsay Martinez, Monica Seng, Liana Wait & Daniel Rubenstein
For grazing herbivores, dung density in feeding areas is an important determinant of exposure risk to faecal-orally transmitted parasites. When host species share the same parasite species, a non-random distribution of their cumulative dung density and/or non-random ranging and feeding behaviour may skew exposure risk and the relative selection pressure parasites impose on each host. The arid-adapted Grevy’s zebra (Equus grevyi) can range more widely than the water-dependent plains zebra (Equus quagga), with which it...

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