Four decades of fragmentation

27 09 2017


I’ve recently read perhaps the most comprehensive treatise of forest fragmentation research ever compiled, and I personally view this rather readable and succinct review by Bill Laurance and colleagues as something every ecology and conservation student should read.

The ‘Biological Dynamics of Forest Fragments Project‘ (BDFFP) is unquestionably one of the most important landscape-scale experiments ever conceived and implemented, now having run 38 years since its inception in 1979. Indeed, it was way ahead of its time.

Experimental studies in ecology are comparatively rare, namely because it is difficult, expensive, and challenging in the extreme to manipulate entire ecosystems to test specific hypotheses relating to the response of biodiversity to environmental change. Thus, we ecologists tend to rely more on mensurative designs that use existing variation in the landscape (or over time) to infer mechanisms of community change. Of course, such experiments have to be large to be meaningful, which is one reason why the 1000 km2 BDFFP has been so successful as the gold standard for determining the effects of forest fragmentation on biodiversity.

And successful it has been. A quick search for ‘BDFFP’ in the Web of Knowledge database identifies > 40 peer-reviewed articles and a slew of books and book chapters arising from the project, some of which are highly cited classics in conservation ecology (e.g., doi:10.1046/j.1523-1739.2002.01025.x cited > 900 times; doi:10.1073/pnas.2336195100 cited > 200 times; doi:10.1016/j.biocon.2010.09.021 cited > 400 times; and doi:10.1111/j.1461-0248.2009.01294.x cited nearly 600 times). In fact, if we are to claim any ecological ‘laws’ at all, our understanding of fragmentation on biodiversity could be labelled as one of the few, thanks principally to the BDFFP. Read the rest of this entry »

It’s all about the variation, stupid

12 01 2015

val-1-3It is one of my long-suffering ecological quests to demonstrate to the buffoons in government and industry that you can’t simply offset deforestation by planting another forest elsewhere. While it sounds attractive, like carbon offsetting or even water neutrality, you can’t recreate a perfectly functioning, resilient native forest no matter how hard you try.

I’m not for a moment suggesting that we shouldn’t reforest much of what we’ve already cut down over the last few centuries; reforestation is an essential element of any semblance of meaningful terrestrial ecological restoration. Indeed, without a major commitment to reforestation worldwide, the extinction crisis will continue to spiral out of control.

What I am concerned about, however, is that administrators continue to push for so-called ‘biodiversity offsets’ – clearing a forest patch here for some such development, while reforesting or even afforesting another degraded patch there. However, I’ve blogged before about studies, including some of my own, showing that one simply cannot replace primary forests in terms of biodiversity and long-term carbon storage. Now we can add resilience to that list.

While I came across this paper a while ago, I’ve only found the time to blog about it now. Published in PLoS One in early December, the paper Does forest continuity enhance the resilience of trees to environmental change?1 by von Oheimb and colleagues shows clearly that German oak forests that had been untouched for over 100 years were more resilient to climate variation than forests planted since that time. I’ll let that little fact sink in for a moment … Read the rest of this entry »

Give some flair to your scientific presentation

18 11 2014


As the desert spring came to the great Centre Red,
Scores of sandalled folk from tin birds descend-ed.
Alice Town had been invaded,
Bearded alike and unshorn-legged.
They sat and stared at words and the odd trend.
Billies boiled to get them through to day’s end
They swapped bush stories that made good sense,
Trying to understand Aussie environments.
One bloke‘s tales caught the punters’ attention,
So this bush poet deserves special mention.
To standard rules he would not kowtow,
So his special science verse I present to you now.

If none of that made any sense, then let me help you out. At the last Ecological Society of Australia meeting in Alice Springs, I witnessed a rather unique way to give a scientific presentation – via bush poetry. Dr. Dale Nimmo of Deakin University was particularly engaging, and he agreed to have his presentation poem reproduced here. Who said scientists were boring? Honourable mention too to Simon Watson for another audience-engaging, bush-poetry seminar (but I don’t have that to reproduce here). There also might be a slidecast of Dale’s presentation coming soon. For now, please enjoy the poetic delivery of science in text.

The Old Grey Box of Heathcote Town

Dale Nimmo

Down around old Heathcote town, just east of Bendigo,
A big old grey box tree casts an eye.
The sallee fills the understory bright as sunlights glow,
As the silvereyes and thornbills flitter by.
This landscape, bruised and battered from 200 years of change,
Holds the secrets of a time lost somehow.
One of Jaara land, where lowan dug and dingoes howled,
The latter two, here, just distant memories now.
The gold rush came like bushfire, ring barked trees fell like boughs
Of the red gums scattered on the old flood plains,
That made way for sheep and cattle, while, fighting a losing battle,
rufous bettongs were never seen again.
When a man of English gentry, Professor Bennett was his name,
Found the woodlands to his aristocratic tastes.
Many days he’d venture in, binoculars under his chin,
He never let a single bird call go to waste.
While at the old St Arnaud Inn, over a couple pints of gin,
Bennet and a bloke called Radford got to talking.
Stealing horses was his game, but he’d give it all away,
To join Bennett in woodlands, bird walking

Read the rest of this entry »