Domestic dogs and Australian wildlife. How dogs impact ecosystems
"There are five main ways domestic dogs can negatively impact the natural environments they visit. These are:
direct physical harm through predatory behaviour
disturbance through chasing and harassment
increased exposure to diseases
interbreeding, which can alter the gene pool of wild canid populations
increased competition for resources.
We know dogs are capable of injuring and killing wildlife, but it’s difficult to determine how common this is, because many events go unreported. While smaller animals such as lizards, gliders and possums are at higher risk, larger species such as koalas can also fall prey to dogs.
One study that looked at wildlife coming into care at Queensland rehabilitation centres reported dog attacks as the cause in about 9% of cases. These cases often resulted in severe injury or death.
Wildlife harassment
You might think it’s harmless for your dog to chase wildlife if it never manages to catch the animals it chases, but that isn’t true. Wild animals optimise their behaviours to meet their needs for foraging, breeding and resting, and being chased by a dog can disrupt this.
For example, certain threatened bird species will nest on the beach and find foraging opportunities based on the tides. One dog forcing one bird to abandon this important activity may have a small impact. But if it happens repeatedly throughout the day, it can become a much bigger problem. It may even drive animals out of the area.
Research conducted in Sydney has shown the mere presence of a leashed dog is enough to temporarily, yet dramatically, reduce the number of bird species detected."
Full article>>
https://theconversation.com/our-dogs-can-terrify-and-even-kill-wildlife-heres-how-to-be-a-responsible-owner-this-summer-214722
Four-legged friend or foe? Dog walking displaces native birds from natural areas
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2391219/
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