A new study offers hope for cold-water species in the face of climate change. The study, published today in the Proceedings of the National Academy of Sciences, addresses a longstanding paradox between predictions of widespread extinctions of cold-water species and a general lack of evidence for those extinctions despite decades of recent climate change.
The paper resulted from collaborative research led by the U.S. Forest Service with partners including the U.S. Geological Survey, the National Ocean and Atmospheric Administration, University of Georgia and the Queensland University of Technology.
The research team drew information from huge stream-temperature and biological databases contributed by over 100 agencies and a USGS-run regional climate model to describe warming trends throughout 222,000 kilometers (138,000 miles) of streams in the northwestern United States.
The scientists found that over the last 40 years, stream temperatures warmed at the average rate of 0.10 degrees Celsius (0.18 degrees Fahrenheit) per decade. This translates to thermal habitats shifting upstream at a rate of only 300-500 meters (0.18-0.31 miles) per decade in headwater mountain streams where many sensitive cold-water species currently live.
The authors are quick to point out that climate change is still detrimentally affecting the habitats of those species, but at a much slower rate than dozens of previous studies forecast. The results of this study indicate that many populations of cold-water species will continue to persist this century and mountain landscapes will play an increasingly important role in that preservation.
"The great irony is that the cold headwater streams that were believed to be most vulnerable to climate change appear to be the least vulnerable. Equally ironic is that we arrived at that insight simply by amassing, organizing and carefully analyzing large existing databases, rather than collecting new data that would have been far more expensive," said Dr. Daniel Isaak, lead author on the study with the U.S. Forest Service.
The results also indicate that resource managers will have sufficient time to complete extensive biological surveys of ecological communities in mountain streams so that conservation planning strategies can adequately address all species.
"One of the great complexities of restoring trout and salmon under a rapidly changing climate is understanding how this change plays out across the landscape. Dr. Isaak and his colleagues show that many mountain streams may be more resistant to temperature change than our models suggest and that is very good news. This provides us more time to effect the changes we need for long-term persistence of these populations," said Dr. Jack Williams, senior scientist for Trout Unlimited.
This study is complementary and builds upon the Cold-Water Climate Shield. This new study is unique as it describes current trends rather than relying on future model projections and addresses a broad scope of aquatic biodiversity in headwater streams (e.g., amphibians, sculpin and trout). In addition, the data density and geographic extent of this study is far greater than most previous studies because over 16,000 stream temperature sites were used with thousands of biological survey locations to provide precise information at scales relevant to land managers and conservationists.
The study, entitled "Slow climate velocities of mountain streams portends their role as refugia for cold-water biodiversity" was conducted by Daniel Isaak, lead author from the U.S. Forest Service Rocky Mountain Research Station; Michael Young, Charles Luce, Dona Horan, Matt Groce and David Nagel of the U.S. Forest Service Rocky Mountain Research Station; Steven Hostetler, U.S. Geological Survey; Seth Wenger, University of Georgia; Erin Peterson, Queensland University of Technology; and Jay Ver Hoef, U.S. NOAA Fisheries, Alaska Fisheries Science Center. Additional funding for this research was provided by the U.S. Fish and Wildlife Service Great Northern and North Pacific Landscape Conservation Cooperatives.
States covered by this study are Idaho, Oregon, Washington, western Montana, as well as small portions of western Wyoming, northern Nevada, northern Utah and northern California.
Jennifer Hayes | EurekAlert!
Chip-based optical sensor detects cancer biomarker in urine
06.12.2019 | The Optical Society
Scientist identify new marker for insecticide resistance in malaria mosquitoes
06.12.2019 | Liverpool School of Tropical Medicine
University of Texas and MIT researchers create virtual UAVs that can predict vehicle health, enable autonomous decision-making
In the not too distant future, we can expect to see our skies filled with unmanned aerial vehicles (UAVs) delivering packages, maybe even people, from location...
With ultracold chemistry, researchers get a first look at exactly what happens during a chemical reaction
The coldest chemical reaction in the known universe took place in what appears to be a chaotic mess of lasers. The appearance deceives: Deep within that...
Abnormal scarring is a serious threat resulting in non-healing chronic wounds or fibrosis. Scars form when fibroblasts, a type of cell of connective tissue, reach wounded skin and deposit plugs of extracellular matrix. Until today, the question about the exact anatomical origin of these fibroblasts has not been answered. In order to find potential ways of influencing the scarring process, the team of Dr. Yuval Rinkevich, Group Leader for Regenerative Biology at the Institute of Lung Biology and Disease at Helmholtz Zentrum München, aimed to finally find an answer. As it was already known that all scars derive from a fibroblast lineage expressing the Engrailed-1 gene - a lineage not only present in skin, but also in fascia - the researchers intentionally tried to understand whether or not fascia might be the origin of fibroblasts.
Fibroblasts kit - ready to heal wounds
Research from a leading international expert on the health of the Great Lakes suggests that the growing intensity and scale of pollution from plastics poses serious risks to human health and will continue to have profound consequences on the ecosystem.
In an article published this month in the Journal of Waste Resources and Recycling, Gail Krantzberg, a professor in the Booth School of Engineering Practice...
03.12.2019 | Event News
15.11.2019 | Event News
15.11.2019 | Event News
06.12.2019 | Earth Sciences
06.12.2019 | Life Sciences
06.12.2019 | Information Technology