New Study: Biodiversity Continues to Decline Worldwide

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Published on April 29th, 2010  |  Discuss This Article  

Species continue to be lost at steady rates across nearly every habitat type on Earth — this despite an international commitment 8 years ago to significantly reduce the rate of such losses by 2010, according to a new study coauthored by a Nature Conservancy scientist.

The study, published today in Science magazine, is the first to comprehensively measure progress toward achieving the goals of the Convention on Biological Diversity (CBD), a treaty that pledged to significantly reduce 2002 rates of biodiversity loss by this year toward the end of alleviating global poverty.

The study’s authors found that virtually all of the indicators of the state of biodiversity — everything from species’ population trends to extinction risk to habitat conditions — have declined since 2002.

Alarmingly, these declines have continued despite increases in policies and funds to promote biodiversity, write the authors. The drivers for these declines include invasive alien species, the impacts of climate change and aggregate human consumption of Earth’s ecological assets.

To go deeper into the numbers, Cool Green Science talked with two of the study’s authors — Dr. Stuart H. M. Butchart of the United Nations Environment Programme and BirdLife International, and Dr. Carmen Revenga, a senior scientist with The Nature Conservancy’s Global Marine Team, who contributed the indicator on river fragmentation:

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Q: We’ve been hearing for a while that biodiversity worldwide is in decline. What’s new in this study?

Stuart Buchart: Although the findings are no surprise to those of us who work in the field, I often find that the general public are surprised to discover this. Decision-makers and politicians are also insufficiently aware of the issue, I suspect.

What is new here is that governments in 2002 made a specific commitment to address the issue and meet a milestone by 2010. We have shown for the first time that they failed. Further, we found that the gap between the intensifying pressures and the responses put in place is widening.

Q: Among the declines in biodiversity indicators cited in the study, which are the most dramatic and indicative? Or is the totality of the declines that should catch our attention?

Stuart Buchart: There are dramatic declines in animal populations (which have declined by one-third since 1970) and coral reef condition (by 40% since 1980), but it is the consistency of the results that is most alarming. Humanity is destroying nature in all corners of the planet.

Carmen Revenga: For me, the aggregated indices of species and population trends give a clear signal that we have not made progress reducing the rate of biodiversity loss. And it’s very worrisome that pressures on resources are increasing at the same time — these trends should really raise people’s eyebrows, because the conservation community has spent a lot of energy and resources trying to reverse these trends and calling attention to them.

How much do these rates of loss have to get before we take them seriously? Can we afford those rates of loss getting higher, especially given the uncertainties of climate change impacts and the capacity for ecosystems to recover or adapt?

Q: Some of the indicators are for Europe alone. Can we extrapolate from these indicators to a global portrait of, say, bird population responses to climate change?

Stuart Buchart: There is one indicator which is based only on European bird populations (climate impacts) and another based only on North American and European data (the Wild Bird Index), but the others are global in coverage.

While there are no other groups or regions yet in which it is possible to show an indicator testing the impacts of climate change on the population trends of a whole suite of organisms, there is plenty of other evidence that climate change is having severe impacts on organisms across the planet.

Q: The indicators on government action have increased — funding for biodiversity protection, protected area coverage, number of countries that have now developed biodiversity action plans, the steps countries have taken against invasives. Yet none of these efforts has slowed the rates of biodiversity decline.

If you had to pick three concrete additional things that need to be addressed on a policy and a conservation level to stop these declines, what would they be?

Stuart Buchart: Here are three:

1. Policies tackling biodiversity loss have been inadequately targeted, implemented and funded. For example, there are lots of protected areas, but they are not in most important places for biodiversity, and they are insufficiently funded and inadequately managed.

2. Biodiversity needs to be integrated and embedded into all parts of government and business. It’s not just a job for the environment ministries.

3. The economic value of biodiversity needs to be accounted for adequately in decision-making.

Carmen Revenga: I’d add to that by saying we need better design and management of landscapes through incorporating protected areas into larger landscape management. For example, while marine protected areas are good, they would be much more powerful in combination with fisheries management practices, territorial access rights, etc.

From a scientific standpoint, we really need to show that healthy biodiversity (species, populations, communities) is a key component in managing ecosystem service delivery, and that we need full ecosystems, not just parts of them, to sustain us. Science can also demonstrate that ecosystems (especially healthy resilient ecosystems) can help mitigate the impacts of climate change (e.g., natural floodplains are much better at attenuating floods than man-made structures).

Q: Finally, what more do we need to know regarding biodiversity loss? What are the indicator gaps?

Stuart Buchart: Many of these indicators have been developed in the last few years — for instance, the IUCN’s Red List Index measuring trends in extinction risk, or indicators of coral reef condition. But we still know less about the tropics than temperate regions, and much less about trends in plants and invertebrates and trends in the benefits we obtain from biodiversity.

Carmen Revenga: If we want to hold countries accountable to their commitments, we can’t continue to set targets that are not measurable; and we need to invest into tracking progress – just as we are doing for our work at The Nature Conservancy with our measures program.

(Image: Asiatic black bear, which is classified as “threatened” on the IUCN Red List. Image credit: ucumari/Flickr through a Creative Commons license.)

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Comments: New Study: Biodiversity Continues to Decline Worldwide

  •  Comment from Leesa M

    Removal of some invasive plant species is something that can be done by almost anyone with little if any expense, once shown how to do it. Our land trust organization, Western Wildlife Corridor, takes conserving land a step beyond owning property or holding conservation easements. The all-volunteer group intends to eradicate all garlic mustard and amur honeysuckle from its preserves. This is being accomplished through volunteer habitat restoration days, and people are eager to help once they learn about it. Other organizations could do this, too. It also gets people out into the woods and meadows to experience first hand what we’re trying to save.

  •  Comment from SecondLawIsDead

    Yeah… species extinctions are a natural process and it’s likely that we’re simply coming toward the decline of the Bird and Mammal dominated biosphere and into a new phase. It is also quite likely if you take a thorough look at the fossil record, that the highest of those species that have developed so far, are meant to take over the biosphere and it seems to me that it’s the human species that fulfills this role, if we choose to not act like animals and be intelligent. Population caps or population reduction is a desire for the extinction of the greatest creation the biosphere has been able to produce; humanity. It also is rather peculiar to me that a bunch of uppity oligarchs like Prince Philip and David Attenborough are pushing this green population control stuff, I think it’s that they only want them and their families to live on planet earth so they can do it with donkeys like Bertrand Russel… hmmm… Well according to this video and Dwight Dana, the entire biosphere had conspired to create a species capable of cognition; maybe all this “naturalist”, “green” anti-development/anti-progress stuff is just unnatural Imperial Brainwashing…?
    http://larouchepac.com/node/19452

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