Banking on Biodiversity
The diversity of life on Earth gives ecosystems the resilience they need to thrive. Yet every day scores of plants and animals go extinct, victims of activities we humans undertake to feed, clothe, house and transport ourselves. How can we meet our own needs without destroying that which sustains us?
By Hannah Hoag (Updated 2/9/2011)
The west coast of Vancouver Island in British Columbia, Canada, has a rugged, involuted shoreline, etched by fjords, sand dunes and sheltered coves. It is sandwiched between two biospheres, the dark swelling sea and the emerald temperate rain forest, and it attracts all sorts—from salmon to surfers.
As idyllic as it seems, the island is under pressure. Wild salmon populations seem to ebb and flow unpredictably, and logging, transportation and aquaculture—activities that promise economic prosperity for the people who live here—are chipping away at the natural coastal ecosystem and the species it contains.
The tug-of-war between opposing priorities—the conservation of natural assets and development—poses a challenge for West Coast Aquatic, the public-private partnership in charge of creating a marine spatial plan for the 285-mile-long shoreline. How to lay out a plan that allows the area to develop while preserving its natural resources, ecosystems and habitat?
This balance of development and conservation is a challenge wherever people are found. At its core is the ability to understand and factor in the true impact—economic and otherwise—of human activity, whether it’s shipping, aquaculture or recreation, on the environment. Would construction of an offshore wave energy installation cut into revenues brought in by recreation? If so, by how much? Is it worth it? What effect would expansion of aquaculture have on native finfish and shellfish? At what price to ecosystem (and economic) integrity?
For West Coast Aquatic, the answers may come from “SimCity”-like software that can illustrate the impacts of different scenarios on human well-being and biodiversity.
Called Marine InVEST, the software considers a region’s underwater topography, native habitats, species distribution, fishing practices, aquaculture sites, coastline features (such as dunes and sea grasses), wave height and periodicity, and recreational activities. Once those data have been collected, Marine InVEST can calculate the outcomes of a variety of scenarios, such as establishing a protective area or shellfish aquaculture sites.
“The tool is flexible in terms of outputs, whether it’s in meters of shoreline not eroded or pounds or number of fish—or dollars,” says Anne Guerry, lead scientist for the project’s marine initiative.
The west coast of Vancouver Island is the first demonstration site of Marine InVEST by the Natural Capital Project, a partnership among Stanford University, The Nature Conservancy, World Wildlife Fund, and the University of Minnesota’s Institute on the Environment.
“In the past, we didn’t think too much about the spatial overlap of marine activities. We tended to think of them in silos,” says Guerry. “A tool like Marine InVEST allows us to make clear connections between different activities, so we can understand and value each one and how emphasizing one can come at the cost of another.”
The group plans to use Marine InVEST in other demonstration sites around the world, including Belize, Puget Sound, Chesapeake Bay and Galveston Bay.
Already, governments, nongovernmental organizations and scientists at universities and institutes in Indonesia, Hawaii, Tanzania, Colombia, Ecuador and China are adopting InVEST, the Natural Capital Project’s land-focused companion to Marine InVEST, in their decision making. In the East Cauca Valley, Colombia, The Nature Conservancy and ASOCAÑA, an association of sugarcane producers, formed a water fund called Fondo de Agua por la Vida y la Sostenibilidad (Water Fund for Life and Sustainability) to invest in key areas to keep the water sediment-free and available. The group then used InVEST to map carbon storage, habitat quality and soil stabilization within the region—showing, for example, where the group should invest in reforestation or in fencing off an area, while taking into account the communities that live within the watersheds.
“Spatial mapping [like InVEST] lets us map out impacts, letting stakeholders better view and understand impacts and trade-offs,” says Ken Bagstad, a postdoctoral associate at the University of Vermont. Bagstad is applying InVEST models for water, carbon, biodiversity and cultural services to the exceptionally biodiverse San Pedro River watershed in southeastern Arizona. Home to one of the last free-flowing rivers in the Southwest and a key bird migration corridor, the region is struggling to balance the water needs of the community with the riverbank ecosystem. Bagstad is using InVEST and another mapping tool, ARIES, to test several scenarios, including an option that would restore an invasive mesquite shrubland to native grasslands. The main challenge of using such tools, says Bagstad, is that they are still in their infancy and require some more work before they can be considered a generalized global tool.
The Planet’s Heartbeat
Biodiversity is the measure of the variety of life. It is the seed from which all ecosystems spring. It is the foundation of the wetlands that purify water and offer protection against floods, the forests that capture carbon dioxide from the atmosphere and store it in biomass, and the coral reefs that offer breeding grounds for fish. Biodiversity provides societies with goods—food, fuel, fiber and medicinal plants—and services—erosion control, hydropower, cultural significance, recreation, carbon sequestration. Clean air, Vermont maple syrup, opportunities to ice fish, plant-sustaining soil and much more all trace back to thriving living things. Each species is like a spot of paint in one of Seurat's pointillist masterpieces—an element of the whole picture.
Environmentalists Tina Fujikawa and Joseph Dougherty recently wrote, “Monitoring trends in biodiversity is like listening to the heartbeat of the planet.” If so, the planet’s pulse is weak and sluggish. Many of Earth’s mammal, bird and amphibian species—10 to 30 percent—are threatened with extinction due to human activities. Some, like corals, which have long been identified as extinction risks, are moving closer to extinction, and ecosystems continue to deteriorate and be splintered apart. Scientists say that if current trends endure, societies could suffer heavy consequences.
In a 2009 article in Nature, an international group of scientists and economists led by Johan Rockström of the Stockholm Resilience Centre at Stockholm University identified and quantified nine planetary boundaries—from climate change and ocean acidification to global fresh water use and biodiversity loss. These boundaries map out humanity’s safe operating space on Earth. Species loss, the group acknowledged, was a natural process, albeit one that has accelerated under human influence. If the extinction rate could be kept at or below 10 species per million species per year, they reasoned, the Earth’s ecosystems might survive. Alas, the current rate is 10 times the goal. For biodiversity loss, the planetary boundary has been exceeded.
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Last modified on January 23, 2012