|Fig. 1: A freshwater crocodile Crocodylus johnstoni with a juvenile freshwater sawfish Pristis pristis in the Kimberley region of Western Australia|
(Photograph: Provided by David Woods, Department of Parks and Wildlife, 2015).
Studying predation on rare aquatic taxa is difficult particularly when dealing with legally protected, large predatory species. Moreover, observing predation on species found in low numbers is difficult in remote, turbid rivers, particularly where the species is nocturnal (Gleiss et al. 2017). Fig. 1, showing an Australian freshwater crocodile (Crocodylus johnstoni) preying upon a freshwater sawfish (Pristis pristis), represents a rare example with considerable implications for conservation.
David L. Morgan, Ruchira Somaweera, Adrian C. Gleiss, Stephen J. Beatty and Jeff M. Whitty. 2017. An Upstream Migration Fought with Danger: Freshwater Sawfish Fending Off Sharks and Crocodiles. Ecology - The Scientific Naturalist. in press 0(0); 1–3. DOI: 10.1002/ecy.1737
Endangered sawfish battle crocodiles and sharks
AustralianGeographic.com.au/news/2017/04/endangered-sawfish-battle-crocodiles-and-sharks via @ausgeo - Australian Geographic
#TheScientificNaturalist investigates #migration dangers: freshwater #sawfish fending off sharks and #crocodiles.
An anecdote on #predation of freshwater #sawfish by other apex #predators in the #Kimberley @CrocResCoal @JuniorCSG