Oh Ranch, Alberta (Photo: Karol Dabbs)Now, what if I told you the world's most endangered ecosystem isn't tropical rainforests or coral reefs? It's a different habitat. And one that is much closer to home than you might think.
The world's most endangered ecosystemEndangerment comes down to risk -- the risk of losing a species, habitat or ecosystem for future generations. When we look at the risk factors for endangerment -- past loss, current amount of conservation, potential for future loss -- the winners (actually, the losers) are temperate grasslands, including the good, old Great Plains of Oh Canada that stretch across southern Manitoba, Saskatchewan and Alberta, and the grasslands of B.C.'s interior. The world's most endangered ecosystem is right here at home. Globally, temperate grasslands cover about eight percent of the Earth's land surface. They generally exist in the interior of continents, where there is not enough rain and snowfall to support forests. There are many reasons why temperate grasslands are endangered. They are the original breadbasket of the world. Over 50 per cent have been converted to crops and other land uses. Much of the remaining are intensively grazed, replacing what were some of the planet's greatest concentrations of wild grazing animals with cattle, goats and sheep. Around the world, temperate grasslands are faced with continuing habitat loss, fragmentation and desertification, impacting both biodiversity and local people that rely on healthy grasslands for their livelihood.
Old Man on his Back, SK (Photo: Bill Caulfeild-Browne)
A picture of declineIn many ways, the fate of Canada's temperate grasslands mirrors the fate and state of this ecosystem around the world. More than 70 per cent of Canada's prairie grasslands has been converted. A 2010 report on the status and trends of Canada's major habitat types found that our grasslands are the only major ecosystem type in our country that is impaired, and continuing to decline. The endangerment of grassland habitat in Canada has cascaded into the endangerment of many grassland species. More than 60 Canadian species at risk depend on this habitat, including species that symbolize our grasslands, such as plains bison, swift fox and greater sage grouse. Just this year, a report on the State of North America's Birds concluded that many grassland birds are rapidly declining, and some species have lost over 70 per cent of their population in the last 40 years. The songs of birds such as Baird's sparrow, Sprague's pipit and chestnut-collared longspur are slowly dimming on our prairies.
We need grasslands, and grasslands need our helpThe loss of Canada's grasslands is a loss for Canadians. In addition to wide-open prairies, our grasslands also contain wetlands, lakes, rivers and valleys. Canada's grasslands support fishes, waterfowl and breath-taking avian migration spectacles as millions of birds stop to rest and feed during their migration to the boreal and Arctic. Grasslands can also showcase how people and nature can coexist. Many of Canada's grasslands have a long history of sustainable cattle grazing. This grazing has supported generations of prairie ranchers, can help to maintain grassland health and benefits many species of prairie wildlife. The loss of Canada's prairies is also a loss for the world. Among the last places on Earth to shelter grasslands at a meaningful scale are the grasslands of North America's Great Plains, and despite a loss of 70 per cent, Canada has some of largest and best sites remaining. A global assessment of critical places to conserve temperate grasslands identifies Canada's prairies as a priority.
Swift fox (Photo: Karol Dabbs)From early efforts to protect the last wild plains bison that roamed the prairies, to the establishment of "regeneration" national parks, to protect dwindling populations of pronghorn antelope, to the return of swift fox to its native habitat in 1983, Canadians have shown a passion and ability to conserve and restore our grassland heritage.
Conservation is a community effortThe Nature Conservancy of Canada has protected more than 197,684 acres (80,000 hectares) of grasslands in properties from coast to coast, including large, intact areas such as Old Man on His Back in southern Saskatchewan. There is also a key, and immediate, opportunity to conserve large areas of prairie and maintain local ranching economies by protecting community pastures in Alberta, Saskatchewan and Manitoba -- public lands that are managed to protect both biodiversity and sustainable grazing in local communities. Here in Canada, we have opportunities to protect and restore habitats that are important for Canadians, and important for the world. We have an opportunity to protect and restore our grasslands.This post originally appeared on NCC's blog,Land Lines.
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