..

The Conversation

  • Written by Simon Cherriman, Ornithology, Murdoch University

At least 136 wedge-tailed eagles were intentionally poisoned last week in East Gippsland, with concerns that more are yet to be found.

In the past five years I have used satellite tracking devices to research wedge-tailed eagles’ movements across Australia, and I’ve never encountered raptor deaths on this scale.

Read more: How birds survived the dinosaur-killing asteroid

It’s been suggested that the birds were killed to protect lambs. Tragically, not only was this illegal cull unnecessary – evidence suggests that eagles do not often kill livestock – but it could also have ecological consequences right across Australia.

Juvenile birds

There are two main categories of wedge-tailed eagles, based on their age class: sedentary breeding adults, which stay in a home range with nest sites; and highly nomadic juvenile birds that can cover huge distances. There are usually fewer adult birds in one place, because they are territorial.

The very high number of birds affected make it likely that they were largely juveniles. There is currently no accurate data on how many wedge-tailed eagles are in Australia, but this single culling event could have serious effects on future generations’ breeding capacity.

Read more: Bold and aggressive behaviour means birds thrive in cities

Sites of persecution can have impacts to eagle populations if they become “ecological sinks”. These are places that draw birds in from a wide area, perhaps because of an unnaturally abundant food source, and then result in birds dying. If these ongoing “mortality black holes” cause hundreds of birds to die in relatively short periods of time, this can start impacting the population.

Mass slaughter of wedge-tailed eagles could have Australia-wide consequences The author in the field with a wedge-tailed hawk. Simon Cherriman, Author provided (No reuse)

Do eagles kill lambs?

The wedge-tailed eagle is a powerful predator that kills a variety of mammals. Anecdotal observations by landowners describe birds attacking live lambs and even half-grown sheep. There are also cases in the literature of them working in tandem to hunt larger prey such as kangaroos – behaviour that has been widely documented for large eagle species.

However, evidence gathered during extensive research in Australia has shown that in most cases, eagles seen feeding on lamb or sheep carcasses are “cleaning up” after other predators like foxes and crows, which were actually the direct cause of death.

There are no documented cases of wedge-tailed eagles causing significant economic impacts to the sheep industry. But even if they did, there are other options besides culling. Carcasses placed near livestock would provide easier alternative food sources, for example. Shepherds can effectively guard flocks and protect lambs. Finally, given that wedge-tailed eagles are protected, it may be appropriate for the government to pay compensation for livestock losses.

Read more: Birds wearing backpacks trace a path to conservation

It must also be emphasised that eagles prey on a range of other species that are considered to be agricultural pests, such as overabundant native kangaroos, cockatoos, and feral species like rabbits and foxes.

Some eagles live, and some die. Such is life on this amazing, arid continent. Death itself is a normal ecological phenomenon, but unnatural deaths on such a large scale can have disastrous consequences for long-lived raptors like the wedge-tailed eagle. We must as a community respect the critical role that predators play in the landscape.

Authors: Simon Cherriman, Ornithology, Murdoch University

Read more http://theconversation.com/mass-slaughter-of-wedge-tailed-eagles-could-have-australia-wide-consequences-98011

Politics

Prime Minister interview with Alan Jones

Good morning Alan.   ALAN JONES: Thank you for your time. Could I just begin by saying that politicians rarely get praise. I have been speaking to farmers during the course of the weekend. You wen...

Alan Jones - avatar Alan Jones

Scott Morrison on Shorten's Border Protection backdown

Border Protection   PRIME MINISTER: Less than 24 hours ago, I warned Australia that Bill Shorten would make Australia weaker and the Labor Party would weaken our border protection. That they could...

Scott Morrison - avatar Scott Morrison

Funding to support women and children escaping domestic violence

Hundreds more women and children escaping domestic and family violence will have a safe place to sleep with a $78 million investment by the Morrison Government.   This investment includes a $60 mi...

Scott Morrison - avatar Scott Morrison

Business News

Sharing the Load - A Guide to Outsourcing as an SME

As a small and medium-size enterprize you need to be able to keep pace with changing technologies and stay ahead of the game. Generally, this means there is a definite need to outsource your SME’s I...

News Company - avatar News Company

Why Branding is vital to your family owned business

Once available only to large corporations, branding is now more accessible and vitally important to every size (and type) of family business, including yours. But what is branding and how does it ...

Stella Gianotto - avatar Stella Gianotto

Statewide Super announce Tony D’Alessandro as CEO

Tony D’Alessandro Tony D’Alessandro will be the new Chief Executive Officer of Statewide Super, effective 1 March 2019. Mr D’Alessandro will replace Richard Nunn, who in January announced his ...

Media Release Service - avatar Media Release Service

Travel

Older generation Australians are embracing solo travel

Allianz predicts a rise in solo travel in 2019, revealing those most likely to ‘go -it-alone’ among the 50+ age group   The popular ‘solo travel’ trend is predicted to continue in 2019 with mor...

Media Release - avatar Media Release

Fun Things You Must Do In Perth

Perth: Sun, sand and 19 beaches might seem to sum up the city, but not quite. The sunniest capital city in Australia offers so much more for you to do. Regardless of what your idea of fun is, you wi...

News Company - avatar News Company

ex-HMAS Tobruk dive site Fraser Coast

Fraser Coast Has a New Sunken Treasure for Divers to Explore A rush of scuba divers from around Australia is expected to begin exploring the underwater wonderland created by the ex-HMAS Tobruk after...

Tracey Joynson - avatar Tracey Joynson

You might also like