Species found to lose fear of predators after 13 generations of protective isolation

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According to Phys.org – latest science and technology news stories (This article and its images were originally posted on Phys.org – latest science and technology news stories June 6, 2018 at 08:33AM.)

(cover Image)
Quoll imaged at a rescue park, Tasmania, Austrailia. Credit: Public Domain

A trio of researchers from the University of Melbourne and the University of Life Science, Sydney, has found an isolated mammal species that lost its fear of predators in just 13 generations. In their paper published in the journal Biology Letters, Chris Jolly, Jonathan Webb and Ben Phillips describe their study of protected northern quolls living in Australia and what they found.

As humans encroach on territory occupied by other species, those other species lose out. Often, the result is endangerment or extinction. That has been the case for northern quolls, which once inhabited large parts of northern Australia. After humans arrived, their numbers declined sharply due mostly to the introduction of invasive cane toads. To prevent their extinction, environmentalists captured several of them and released them on two small off the coast of Australia. That effort, it seemed, was a remarkable success as quoll populations soon soared on the islands. Pleased with their results, environmentalist tried to capitalize on their success by capturing a large number of the creatures and placing them back in their native environment. Unfortunately, the experiment did not go as planned. Over the span of just 21 months, most of the quolls were gone. This time, it was not poisonous toads causing their deaths, it was dingoes capturing and eating them. This came as a surprise to the team, because prior to the arrival of humans, quolls were able to survive in territory occupied by dingoes. They did so, the researchers note, by hiding from them.

To better understand why the transplanted quolls fell victim to the dingoes, the researchers captured several of them from populations on the protected island and from locations where they had survived on the mainland. All of the quolls were put into cages where they could access a food source only by poking their snout through a hole in a box. Some of the holes were lined with dingo fur, or cat fur. In studying how the quolls behaved, the team found that those quolls from the protected island had no fear of sticking their snouts through predator-scented holes, showing that they had lost their fear of them—in just 13 generations.

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More information:
Chris J. Jolly et al. The perils of paradise: an endangered species conserved on an island loses antipredator behaviours within 13 generations, Biology Letters (2018). DOI: 10.1098/rsbl.2018.0222

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This article and its images were originally posted on [Phys.org – latest science and technology news stories] June 6, 2018 at 08:33AM. All credit to both the author Bob Yirka and Phys.org – latest science and technology news stories | ESIST.T>G>S Recommended Articles Of The Day.





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