June 06, 2012
An as yet unidentified species of gecko on the island of Java, Indonesia. Photo by: Rhett A. Butler.
"We need to take biodiversity loss far more seriously—from individuals to international governing bodies—and take greater action to prevent further losses of species," said lead author Bradley Cardinale, with the University of Michigan, in a press release. "This is a consensus statement by experts who agree that loss of Earth's wild species will be harmful to the world's ecosystems and may harm society by reducing ecosystem services that are essential to human health and prosperity."
Cardinale and colleagues found that research over the past two decades has proven again and again that biodiversity is key for functioning and abundant ecosystems, which supply humanity with food and commodities. For example, the scientists write that the evidence shows that genetic diversity boosts crop yields, fisheries' catches, wood production, and fodder in grasslands. They also point out that plant diversity increases carbon sequestration and improves soil health, while decreasing plant disease and mitigating the damage done by invasive species.
"We've reached a point where efforts to preserve species and biological diversity might no longer be an act of altruism," explains co-author, Diane Srivastava, with the University of British Columbia. "This research review dramatically underscores the importance of strengthening—not weakening or curtailing—environmental assessment processes in order to stem the tide of the loss of species and diversity that so many humans benefit from and depend on."
Scientists have been warning for decades that if business-as-usual continues the Earth may well undergo a mass extinction with large-scale impacts on human society. Last year, 99.5 percent of 583 conservation scientists agreed in a survey in Conservation Biology that a serious loss in biodiversity was 'likely', 'very likely', or 'virtually certain'.
According to the IUCN Red List, over 19,000 species are currently classified as Vulnerable, Endangered, or Critically Endangered. The IUCN has also recorded 875 extinctions in the the last 500 years. However the Red List has only had the capacity to date to analyze around 3 percent of the world's known species—mostly mammals, birds, and amphibians—which number about 2 million in total. The vast majority of extinctions have likely gone undocumented, with lesser-known species simply vanishing beyond human record.
"No one can agree on what exactly will happen when an ecosystem loses a species, but most of us agree that it's not going to be good. And we agree that if ecosystems lose most of their species, it will be a disaster," said co-author Shahid Naeem of Columbia University.
The scientists say that many questions regarding the importance of biodiversity to the world's ecosystems remain unanswered, but emphasize that researchers know enough now to make the point that biodiversity is inherently connected to human well-being.
While the ecologists' consensus statement has been released in conjunction with the Rio+20 Summit, many already fear the summit is a failure before it has even begun. Yesterday, the World Wide Fund for Wildlife (WWF) warned that negotiations over an already watered-down agreement to be signed at the summit could well "collapse." Even before this expectations for the summit, which is devoting little time to global environmental crises like climate change and deforestation, have been low. Some observers say that while governments are failing to take the summit seriously, it will bring together hundreds of NGOs, businesses, and experts who, together, could build useful coalitions to help tackle global environmental and poverty issues.
The world's species face a variety of human-caused global and local threats including climate change, deforestation, habitat loss, overexploitation, invasive species, pollution, disease, and mining and fossil fuel extraction.
Island bat goes extinct after Australian officials hesitate
(05/23/2012) Nights on Christmas Island in the Indian Ocean will never again be the same. The last echolocation call of a tiny bat native to the island, the Christmas Island pipistrelle (Pipistrellus murrayi), was recorded on August 26th 2009, and since then there has been only silence. Perhaps even more alarming is that nothing was done to save the species. According to a new paper in Conservation Letters the bat was lost to extinction while Australian government officials equivocated and delayed action even though they were warned repeatedly that the situation was dire. The Christmas Island pipistrelle is the first mammal to be confirmed extinct in Australia in 50 years.
Wildlife in the tropics plummets by over 60 percent
(05/15/2012) In 48 years wildlife populations in the tropics, the region that holds the bulk of the world's biodiversity, have fallen by an alarming 61 percent, according to the most recent update to the Living Planet Index. Produced by the World Wide Fund for Nature (WWF) and the Zoological Society of London (ZSL), the index currently tracks almost 10,000 populations of 2,688 vertebrate species (including mammals, birds, reptiles, amphibians, and fish) in both the tropics and temperate regions.
Biodiversity loss cripples plant growth
(05/02/2012) For decades scientists have been warning that if global society continues with "business-as-usual" practices the result will be a mass extinction of the world's species, an extinction event some researchers say is already underway. However, the direct impacts of global biodiversity loss has been more difficult to compile. Now a new study in Nature finds that loss of plant biodiversity could cripple overall plant growth.
For Earth Day, 17 celebrated scientists on how to make a better world
(04/22/2012) Seventeen top scientists and four acclaimed conservation organizations have called for radical action to create a better world for this and future generations. Compiled by 21 past winners of the prestigious Blue Planet Prize, a new paper recommends solutions for some of the world's most pressing problems including climate change, poverty, and mass extinction. The paper, entitled Environment and Development Challenges: The Imperative to Act, was recently presented at the UN Environment Program governing council meeting in Nairobi, Kenya.
Cinderella animals: endangered species that could be conservation stars
(04/18/2012) A cursory look at big conservation NGOs might convince the public that the only species in peril are tigers, elephants, and pandas when nothing could be further from the truth. So, why do conservation groups roll out the same flagship species over-and-over again? Simple: it is believed these species bring in donations. A new paper in Conservation Letters examines the success of using flagship species in raising money for larger conservation needs, while also pointing out that conservation groups may be overlooking an important fundraising source: "Cinderella animals."
Humans killed off magnificent Australian megafauna, flipping rainforest into savannah
(03/27/2012) The theory that humans, and not climate change, was primarily responsible for the extinction of giant marsupials in prehistoric Australia takes another step forward with a new study in Science. Exploring sediment cores for past evidence of big herbivores, researchers found that the arrival of humans coincided with the loss of a menagerie of magnificent beasts, from giant kangaroos to fearsome marsupial lions and monster birds to Komodo dragon-like reptiles. The decline of this megafauna ultimately led to ecological changes that may have caused Australia's rainforest to become savannah.
Carbon emissions paving way for mass extinction in oceans
(03/05/2012) Human emissions of carbon dioxide may be acidifying the oceans at a rate not seen in 300 million years, according to new research published in Science. The ground-breaking study, which measures for the first time the rate of current acidification compared with other occurrences going back 300 million years, warns that carbon emissions, unchecked, will likely lead to a mass extinction in the world's oceans. Acidification particularly threatens species dependent on calcium carbonate (a chemical compound that drops as the ocean acidifies) such as coral reefs, marine mollusks, and even some plankton. As these species vanish, thousands of others that depend on them are likely to follow.