Tag Archives: mesopredator

Predator Poop Propagating Plant Persistence

Image Credit: Rene Rauschenberger, Pixabay licence, Image Cropped

An omnivorous mesopredator modifies predation of omnivore-dispersed seeds (2021) Bartel & Orrock, Ecosphere, https://doi.org/10.1002/ecs2.3369.

The Crux

The evolution of different methods of seed dispersal has played a huge role in shaping plant diversity and distribution. Earlier plants could only use the water or wind to disperse their offspring, but eventually plants evolved the ability to harness the movement of animals, letting their seeds disperse often further and more efficiently than before.

Seeds are also a vital form of food for many species, including small rodents and insects. Larger animals too, including wild boars, bears, and coyotes who will get stuck into berries when there’s plenty around. This leads to them leaving berry seeds mixed in with their faeces. We might be deterred by the idea of picking dinner out of another animals poop, but many of those rodents and insects don’t mind.

But what about when those faeces are from one of your predators? Do you still want that seed, or should you get the hell out of an area clearly inhabited by a threat to your livelihood? The answers to these questions can determine which seeds get left where, which in turn can determine where plants end up taking root and spreading to. That’s the focus of today’s study.

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Releasing the Devil

Conservation trade-offs: Island introduction of a threatened predator suppresses invasive mesopredators but eliminates a seabird colony (2020) Scoleri et al., Biological Conservation, https://doi.org/10.1016/j.biocon.2020.108635

The Crux

Invasive species are a nightmare for local wildlife wherever they are, but on islands they’re even worse. Introduced predators can wipe out entire populations of species, as Tibbles the cat and his fellow feral buddies demonstrated in the extreme when they drove the Lyall’s wren extinct. On coastal islands this is a recurring theme. An invasive ‘mesopredator’ – like the American Mink in Europe or the cat in Australia – is introduced and quickly goes to work, often on small mammals, birds, reptiles and amphibians alike.

Sometimes, but not always, introducing a top predator to an area can suppress the activities of the mesopredator. They can outcompete the mesopredator for resources, or begin to prey on them. The problem is, that if that top predator goes after the same food as the mesopredator, the local prey species suffer either way.

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