Nature’s backbone at risk
The most comprehensive assessment of the world’s vertebrates confirms an extinction crisis with one-fifth of species threatened. A recent study by Kew and partners has further revealed that that one fifth of plant species are also at risk - including Caliphruria tenera. However, the situation would be worse were it not for current global conservation efforts, according to a study launched today at the 10th Conference of the Parties to the Convention on Biological Diversity, in Nagoya, Japan.
26 Oct 2010
Dried specimen of Caliphruria tenera collected in Colombia in 1844 and stored in Kew's Herbarium. This plant species is rated critically endangered and possibly extinct according to IUCN Red List categories and criteria (Image: RBG Kew)
A recent study on plants coordinated by Kew and involving several IUCN partners, suggested that just over one-fifth of all plant species are threatened, that most threatened plant species are found in the tropics and that the most threatening process is man-induced habitat lossProfessor Stephen Hopper, Director of the Royal Botanic Gardens, Kew.
The study, to be published in the international journal Science, used data for 25,000 species from The IUCN Red List of Threatened Species ™, to investigate the status of the world’s vertebrates (mammals, birds, amphibians, reptiles and fishes) and how this status has changed over time. The results show that, on average, 50 species of mammal, bird and amphibian move closer to extinction each year due to the impacts of agricultural expansion, logging, over-exploitation, and invasive alien species.
“The ‘backbone’ of biodiversity is being eroded,” said the great American ecologist and writer Professor Edward O. Wilson, at Harvard University. “One small step up the Red List is one giant leap forward towards extinction. This is just a small window on the global losses currently taking place.”
Conservation efforts are making a difference
Southeast Asia has experienced the most dramatic recent losses, largely driven by the planting of export crops like oil palm, commercial hardwood timber operations, agricultural conversion to rice paddies, and unsustainable hunting. Parts of Central America, the tropical Andes of South America, and even Australia, have also all experienced marked losses, in particular due to the impact of the deadly chytrid fungus on amphibians.
Whilst the study confirms previous reports of continued losses in biodiversity, it is the first to present clear evidence of the positive impact of conservation efforts around the globe. Results show that the status of biodiversity would have declined by at least an additional 20% if conservation action had not been taken.
1 in 5 plant species are also at risk
“A recent study on plants coordinated by Kew and involving several IUCN partners, suggested that just over one-fifth of all plant species are threatened, that most threatened plant species are found in the tropics and that the most threatening process is man-induced habitat loss”, said Professor Stephen Hopper, Director of the Royal Botanic Gardens, Kew. “Conifers, with a world-wide presence in virtually all types of forest, face extinction for at least 29% of species. Many are ‘keystone’ species, without which their ecosystem could collapse, taking other species with them to extinction. Unsustainable logging and deforestation are the main causes. Clearly it is important to continue and increase conservation actions across the globe.”
The study highlights 64 mammal, bird and amphibian species that have improved in status due to successful conservation action. This includes three species that were extinct in the wild and have since been re-introduced back to nature: the California condor, Gymnogyps californianus, and the black-footed ferret, Mustela nigripes, in the United States, and Przewalski’s horse, Equus ferus, in Mongolia.
This is clear evidence for why we absolutely must emerge from Nagoya with a strategic plan of action to direct our efforts for biodiversity in the coming decade.Julia Marton-Lefèvre, Director General of IUCN.
Conservation efforts have been particularly successful at combating invasive alien species (non-native species) on islands. The global population of Seychelles magpie-robin, Copsychus sechellarum, increased from fewer than 15 birds in 1965 to 180 in 2006 through control of introduced predators, like the brown rat, Rattus norvegicus, and captive-breeding and re-introduction programmes. On Mauritius, six bird species have undergone recoveries in status, including the Mauritius kestrel, Falco punctatus, whose population has increased from just four birds in 1974 to nearly 1,000.
In South America, protected areas and a combination of the Convention on International Trade in Endangered Species (CITES) and the Vicuña Convention helped spark the recovery of the Vicuña, Vicugna vicugna. Similarly, legislation enacted to ban commercial whaling has seen the humpback whale, Megaptera novaeangliae, move from Vulnerable to Least Concern. Unfortunately, very few amphibians have yet shown signs of recovery, but international efforts are escalating, including a programme to reintroduce the Kihansi spray toad, Nectophrynoides asperginis, back into the wild in Tanzania. Find out more about the IUCN Red List categories and criteria.
Scaling up conservation efforts
The authors caution that their study represents only a minimum estimate of the true impact of conservation, highlighting that some 9% of threatened species have increasing populations.
Their results show that conservation works, given resources and commitment. They also show that global responses will need to be substantially scaled up, because the current level of conservation action is outweighed by the magnitude of threat. In this light, policy-makers at the CBD meeting in Nagoya have been calling for a very significant increase in resources – from extremely low current levels – to make the objectives of the Convention achievable.
The paper highlights that the percentage of species threatened among vertebrates ranges from 13% of birds to 41% of amphibians. Although the study focused on vertebrates, it also reports on the levels of threat among several other groups assessed for the IUCN Red List, including 14% of seagrasses, 32% of freshwater crayfish, and 33% of reef-building corals.
The level of threat among cycads is extremely critical, with 63% threatened with extinction. Cycads, the most ancient group of seed plants alive today, are subject to extremely high levels of illegal harvesting and trade, and are in danger of going the same way as the dinosaurs.
The cost of losing nature
Recently, a UN-sponsored study called The Economics of Ecosystems and Biodiversity (TEEB) calculated the cost of losing nature at $2-5 trillion per year, predominantly in poorer parts of the world. A recent study found one-fifth of more than 5,000 freshwater species in Africa are threatened, putting the livelihoods of millions of people dependent on these vital resources at risk.
Failure to meet the internationally agreed 2010 target to reduce biodiversity loss does not mean that conservation efforts have been in vain, as this study demonstrates. However, the erosion of biodiversity has reached such dangerous levels that we cannot afford to fail again. Ambitious targets are needed for 2020, and to meet them will require urgent and concerted action on a greatly expanded scale. It is time for the world’s governments, meeting in Nagoya, to rise effectively to this global challenge.
- Kew at the Conference of the Parties 2010 in Nagoya
- Interactive maps and charts - Explore the state of plant life around the world
- Kew Video - Perspectives on Biodiversity
- Interactive map - Explore Kew's work around the world
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Without plants there could be no life on earth, and yet every day another four plant species face extinction. Too often when we hear these kind of statistics there is little that we can do as individuals, but thanks to Kew's Millennium Seed Bank Partnership and the Adopt a Seed, Save a Species campaign there is something that you can do to ensure the survival of a plant species.
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