Increasing human population density drives environmental degradation in Africa

26 06 2019

 

stumps

Almost a decade ago, I (co-) wrote a paper examining the socio-economic correlates of gross, national-scale indices of environmental performance among the world’s nations. It turned out to be rather popular, and has so far garnered over 180 citations and been cited in three major policy documents.

In addition to the more pedestrian ranking itself, we also tested which of three main socio-economic indicators best explained variation in the environmental rank — a country’s gross ‘wealth’ indicator (gross national income) turned out to explain the most, and there was no evidence to support a non-linear relationship between environmental performance and per capita wealth (the so-called environmental Kuznets curve).

Well, that was then, and this is now. Something that always bothered me about that bit of research was that in some respects, it probably unfairly disadvantaged certain countries that were in more recent phases of the ‘development’ pathway, such that environmental damage long since done in major development pulses many decades or even centuries prior to today (e.g., in much of Europe) probably meant that certain countries got a bit of an unfair advantage. In fact, the more recently developed nations probably copped a lower ranking simply because their damage was fresher

While I defend the overall conclusions of that paper, my intentions have always been since then to improve on the approach. That desire finally got the better of me, and so I (some might say unwisely) decided to focus on a particular region of the planet where some of the biggest biodiversity crunches will happen over the next few decades — Africa.

Africa is an important region to re-examine these national-scale relationships for many reasons. The first is that it’s really the only place left on the planet where there’s a semi-intact megafauna assemblage. Yes, the great Late Pleistocene megafauna extinction event did hit Africa too, but compared to all other continents, it got through that period relatively unscathed. So now we (still) have elephants, rhinos, giraffes, hippos, etc. It’s a pretty bloody special place from that perspective alone.

P1080625

Elephants in the Kruger National Park, South Africa (photo: CJA Bradshaw)

Then there’s the sheer size of the continent. Unfortunately, most mercator projections of the Earth show a rather quaint continent nuzzled comfortably in the middle of the map, when in reality, it’s a real whopper. If you don’t believe me, go to truesize.com and drag any country of interest over the African continent (it turns out that its can more or less fit all of China, Australia, USA, and India within its greater borders).

Third, most countries in Africa (barring a few rare exceptions), are still in the so-called ‘development’ phase, although some are much farther along the economic road than others. For this reason, an African nation-to-nation comparison is probably a lot fairer than comparing, say, Bolivia to Germany, or Mongolia to Canada.

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Primate woes where the oil palm grows

16 08 2018

gorilla

A new article just published in PNAS reveals how future expansion of the palm-oil industry could have terrible consequences for African primates.

Researchers from the European Commission’s Joint Research Centre, CIRAD, Liverpool John Moores University, and ETH Zurich searched for “areas of compromise” combining high oil palm suitability with low primate vulnerability, as possible locations where to accommodate new oil-palm plantations while reducing detrimental effects on primate populations.

Results show that there is small room for compromise. In fact, potential areas of compromise are rare across the whole African continent, covering a total extent of 0.13 Mha of land highly suited to oil palm cultivation where primate vulnerability is low, rising to just 3.3 Mha if all land with at least minimum suitability to grow oil palm is taken into account.

Palm oil production is steadily rising, and expected to accelerate in response to growing world’s population, with future demand driven not only by the food industry, but also by the biofuel market. Read the rest of this entry »





Drivers of protected-area effectiveness in Africa

31 01 2018
Bowker_et_al-2017-Conservation_Biology. Fig. 1

Subtropical and
Tropical Moist Broadleaf Forest of
Africa with 224 parks surrounded
by a 10-km buffer area. ©
2016 Society for Conservation Biology.

I’ve just read an interesting paper published in late 2016 in Conservation Biology that had so far escaped my attention. But given my interest in African conservation recently (and some interesting research results on the determinants of environmental performance for that region should be coming soon out of our lab), the work caught my eye.

The paper by Bowker and colleagues asked a question that has been asked previously regarding the ‘effectiveness’ of protected areas — do they succeed in limiting forest loss? While forest loss itself is not necessarily indicative of biodiversity erosion in any given area (for that, you need measures of species trends, etc.), it is arguably one of the most important drivers of species loss today.

The first set out to differentiate ‘effective’ from ‘ineffective’ protected areas, which was a simple binary variable related to whether there was less deforestation inside the protected area relative to comparable points outside (effective), or greater than or equal to deforestation outside (ineffective). The authors then related this binary response to a series of biophysical and social indicators. Read the rest of this entry »





Influential conservation ecology papers of 2017

27 12 2017

Gannet Shallow Diving 03
As I have done for the last four years (20162015, 2014, 2013), here’s another retrospective list of the top 20 influential conservation papers of 2017 as assessed by experts in F1000 Prime.

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Potential conservation nightmare unfolding in South Africa

31 10 2016

fees-must-fallLike most local tragedies, it seems to take some time before the news really grabs the overseas audience by the proverbial goolies. That said, I’m gobsmacked that the education tragedy unfolding in South Africa since late 2015 is only now starting to be appreciated by the rest of the academic world.

You might have seen the recent Nature post on the issue, and I do invite you to read that if all this comes as news to you. I suppose I had the ‘advantage’ of getting to know a little bit more about what is happening after talking to many South African academics in the Kruger in September. In a word, the situation is dire.

We’re probably witnessing a second Zimbabwe in action, with the near-complete meltdown of science capacity in South Africa as a now very real possibility. Whatever your take on the causes, justification, politics, racism, or other motivation underlying it all, the world’s conservation biologists should be very, very worried indeed.

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Valuing what we have to prevent it from disappearing

30 09 2016
29 year-old 'Tembo' shows us his grinders © CJA Bradshaw

29 year-old ‘Tembo’ shows us his grinders. Groom Anton is making sure Tembo remains well-rewarded for his good behaviour © CJA Bradshaw

I acknowledge that I’ve been banging on a bit about southern Africa over the last few weeks, but I defend my enthusiasm on the grounds that my first trip to the Kruger National Park profoundly changed the way I view extinction theory and conservation biology.

Today’s post rounds off this mini-series with something I only alluded to in my last: interacting with tame elephants.

I have always been in two minds about the role of animals in captivity, with my opinion that most zoos edge toward the negative because most people who attend them appear to view the animals as a freak-show rather than appreciate their beauty or be fascinated by their behaviour and ecology; add the near-impossible-to-avoid psychological distress to which most captive animals succumb, many zoos in particular are probably better off not existing at all.

That being the case, I won’t simply write off all captive situations as ‘negative’, because if done well, they can have a wonderful educational role to play. Read the rest of this entry »





Transition from the Anthropocene to the Minicene

24 09 2016
Going, going ...

Going, going … © CJA Bradshaw

I’ve just returned from a life-changing trip to South Africa, not just because it was my first time to the continent, but also because it has redefined my perspective on the megafauna extinctions of the late Quaternary. I was there primarily to attend the University of Pretoria’s Mammal Research Institute 50thAnniversary Celebration conference.

As I reported in my last post, the poaching rates in one of the larger, best-funded national parks in southern Africa (the Kruger) are inconceivably high, such that for at least the two species of rhino there (black and white), their future persistence probability is dwindling with each passing week. African elephants are probably not far behind.

As one who has studied the megafauna extinctions in the Holarctic, Australia and South America over the last 50,000 years, the trip to Kruger was like stepping back into the Pleistocene. I’ve always dreamed of walking up to a grazing herd of mammoths, woolly rhinos or Diprotodon, but of course, that’s impossible. What is entirely possible though is driving up to a herd of 6-tonne elephants and watching them behave naturally. In the Kruger anyway, you become almost blasé about seeing yet another group of these impressive beasts as you try to get that rare glimpse of a leopard, wild dogs or sable antelope (missed the two former, but saw the latter). Read the rest of this entry »





Inexorable rise of human population pressures in Africa

31 08 2016
© Nick Brandt

© Nick Brandt

I’ve been a bit mad preparing for an upcoming conference, so I haven’t had a lot of time lately to blog about interesting developments in the conservation world. However, it struck me today that my preparations provide ideal material for a post about the future of Africa’s biodiversity.

I’ve been lucky enough to be invited to the University of Pretoria Mammal Research Unit‘s 50th Anniversary Celebration conference to be held from 12-16 September this year in Kruger National Park. Not only will this be my first time to Africa (I know — it has taken me far too long), the conference will itself be in one of the world’s best-known protected areas.

While decidedly fortunate to be invited, I am a bit intimidated by the line-up of big brains that will be attending, and of the fact that I know next to bugger all about African mammals (in a conservation science sense, of course). Still, apparently my insight as an outsider and ‘global’ thinker might be useful, so I’ve been hard at it the last few weeks planning my talk and doing some rather interesting analyses. I want to share some of these with you now beforehand, although I won’t likely give away the big prize until after I return to Australia.

I’ve been asked to talk about human population pressures on (southern) African mammal species, which might seem simple enough until you start to delve into the complexities of just how human populations affect wildlife. It’s simply from the perspective that human changes to the environment (e.g., deforestation, agricultural expansion, hunting, climate change, etc.) do cause species to dwindle and become extinct faster than they otherwise would (hence the entire field of conservation science). However, it’s another thing entirely to attempt to predict what might happen decades or centuries down the track. Read the rest of this entry »





Outright bans of trophy hunting could do more harm than good

5 01 2016

In July 2015 an American dentist shot and killed a male lion called ‘Cecil’ with a hunting bow and arrow, an act that sparked a storm of social media outrage. Cecil was a favourite of tourists visiting Hwange National Park in Zimbabwe, and so the allegation that he was lured out of the Park to neighbouring farmland added considerable fuel to the flames of condemnation. Several other aspects of the hunt, such as baiting close to national park boundaries, were allegedly done illegally and against the spirit and ethical norms of a managed trophy hunt.

In May 2015, a Texan legally shot a critically endangered black rhino in Namibia, which also generated considerable online ire. The backlash ensued even though the male rhino was considered ‘surplus’ to Namibia’s black rhino populations, and the US$350,000 generated from the managed hunt was to be re-invested in conservation. Together, these two incidents have triggered vociferous appeals to ban trophy hunting throughout Africa.

These highly politicized events are but a small component of a large industry in Africa worth > US$215 million per year that ‘sells’ iconic animals to (mainly foreign) hunters as a means of generating otherwise scarce funds. While to most people this might seem like an abhorrent way to generate money, we argue in a new paper that sustainable-use activities, such as trophy hunting, can be an important tool in the conservationist’s toolbox. Conserving biodiversity can be expensive, so generating money is a central preoccupation of many environmental NGOs, conservation-minded individuals, government agencies and scientists. Making money for conservation in Africa is even more challenging, and so we argue that trophy hunting should and could fill some of that gap. Read the rest of this entry »





Worlds collide: greenwashed development to kill biodiversity

15 03 2012

Another development fiasco that, if it goes ahead, will devastate a Biodiversity Hotspot and ultimately, reduce the livelihood prospects of millions of West Africans.

In yet another move to expose and shame the greedy developers behind another massive (and superlatively greenwashed) oil palm development in the tropics (see our previous Open Letter), Bill Laurance and Josh Linder have organised another Open Letter from some of the world’s top conservation scientists (again, I count myself fortunate to be included in that group) denouncing the project. The press release is below, followed by the letter itself:

Eleven of the world’s top scientists have produced an open letter to the public urging the Cameroon government to stop a giant oil palm plantation that they say will threaten some of Africa’s most important protected areas.

The project, sponsored by a subsidiary of U.S. agribusiness giant Herakles Farms in collaboration with a U.S. nonprofit organization, All for Africa, would span 70,000 hectares (154,000 acres), an area nearly the size of New York City.

“It’s simply frightening in scope,” said Thomas Struhsaker, a leading expert on African primates and rainforest ecology at Duke University in North Carolina, USA, who has worked in the region for nearly a half-century.

The project would destroy a critical forested area that currently links five national parks or protected areas in Cameroon, say the scientists.

“These forests are vital for wildlife, including the African elephant, chimpanzee and drill, all threatened or endangered species,” said anthropologist Joshua Linder of James Madison University in Virginia, USA, who has helped coordinate the protest. “These animals rely on the forests that would be destroyed to survive and move among the parks.”

“This area is a biodiversity hotspot, some of the world’s most biologically important real estate,” said tropical ecologist William Laurance of James Cook University in Australia, who studies threats to wildlife in the Congo Basin.

“There’s no way a project like this would be allowed in most countries, because the price for biodiversity is just too high,” said Laurance.

The project has been promoted in Cameroon as environmentally sustainable, but the scientists heatedly disagree. “Those promoting this project are misleading everyone—especially the people and government of Cameroon,” said Linder. “They claim the forests they want to clear are mostly logged and degraded, but we’ve shown clearly that they include lots of tall, dense forest that’s vital for wildlife and nature conservation.” Read the rest of this entry »





September 2010 Issue of Conservation Letters out

13 10 2010

Conservation Lettersfifth issue (September) of Volume 3 is now out. Some good ones here.

CJA Bradshaw








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