Big trees boost city life

Feb 03, 2012
A gang gang pokes its head out from its nest in a gum tree. Credit: Pierre Pouliquin http://www.flickr.com/photos/pierre_pouliquin/

(PhysOrg.com) -- New research from The Australian National University has revealed for the first time the role large trees play in sustaining biodiversity and bird life in urban environments.

The study, led by Karen Stagoll, a PhD candidate in the ANU Fenner School of Environment and Society, examined large eucalypt trees in small suburban parks across Canberra. The team’s study is the first of its kind in the world and clearly shows that large trees in urban environments provide habitat resources crucial for wildlife.

“Large trees are considered ‘keystone structures’, or ones which provide resources like food, nest sites and shelter for wildlife, in agricultural and forestry production landscapes,” said Ms Stagoll. “But research demonstrating this in urban landscapes was urgently needed.

“We found that parks with more large eucalypts had more bird species and higher bird numbers, including more native woodland-dependent birds, some of which are declining in Canberra and the surrounding region. Birds were also more likely to breed in parks with large trees.

“We also found that if parks had really large, old trees they had more birds than parks with only smaller trees.”

Ms. Stagoll said that it is vital that large trees in are managed properly if cities are to maintain a diversity of wildlife.

“Losing large trees from cities may have far-reaching ecological consequences that may undermine other wildlife conservation measures,” she said.

“Large eucalypts are protected in the ACT, but measures may not go far enough. We found that 14 per cent of trees measured were significantly important for birds but miss out on formal protection. It is likely that similar trees are at risk in other cities in Australia and the rest of the world.

“Public safety dangers posed by large, old trees should be managed by strategies other than tree removal, for example fencing off risky areas or using landscaping to minimise risk. We also need to plan for the future if we want to keep large and our native bird species within the city limits.  It takes decades for a newly planted sapling to grow into a large tree, so we need to think and act early.”

The findings have been published in the journal Conservation Letters and are available online at doi.wiley.com/10.1111/j.1755-2… 60;   ;

The research was jointly funded by the ANU Fenner School of Environment and Society and the ACT Department of Environment and Sustainable Development.

Explore further: No-take marine reserves a no-win for seahorses

Provided by Australian National University

5 /5 (3 votes)
add to favorites email to friend print save as pdf

Related Stories

Plants in cities are an underestimated carbon store

Jul 11, 2011

Vegetation in towns and cities can make a significant contribution to carbon storage and, ecologists say, could lock away even more carbon if local authorities and gardeners planted and maintained more trees. The study, published ...

Native species proposed as viable long-term sequesters

Jan 26, 2012

(PhysOrg.com) -- New research into the carbon sequestration abilities of native tree species was undertaken by Greening Australia, and will hopefully make native species more attractive and viable option for ...

How trees withstand a storm

Sep 12, 2011

As Hurricane Katia slowly approaches the East Coast, many people are still cleaning up from Hurricane Irene, whose high winds last week caused trees to fall, leaving millions without power.

Scientists find new Australian frog

Jul 26, 2011

(PhysOrg.com) -- A new miniature frog species or ‘toadlet’ has been discovered in the resource-rich Pilbara region of Western Australia, an area previously thought to support very few of the amphibians.

Recommended for you

Dolphin hunting season kicks off in Japan

11 hours ago

The controversial six-month dolphin hunting season began on Monday in the infamous town of Taiji, but bad weather would delay any killing, a local official told AFP.

User comments : 0