NSF: Discovery Peering into the secret world of life beneath winter snows .- Mirando en el mundo secreto de la vida bajo las nieves del invierno

Hola amigos: A VUELO DE UN QUINDE EL BLOG.,  la Fundación de Ciencias de los Estados Unidos de América, the National Science Foundation (NSF), ha hecho un gran descubrimiento como viven la fauna y la flora, durante le crudo invierno en el Hemisferio Norte.

NSF, nos dice : La nieve cubre alrededor del 40 por ciento de las masas de tierra años de la Tierra tras año. Y, como los científicos están descubriendo, la nieve es crítica para los animales y plantas que viven en las latitudes del norte, así como aquellos en latitudes muy lejos del sur, como la Patagonia en la punta de América del Sur. Asegura su - y nuestra - la supervivencia.

"Sin la nieve, la vida vegetal y animal sería completamente diferente", dice el biólogo Jonathan Pauli de la Universidad de Wisconsin-Madison.

Pauli y científicos como Ben Zuckerberg, también de la Universidad de Wisconsin-Madison, son miembros de una nueva generación de investigadores llamados ecologistas invierno. El campo, que se centra en las relaciones entre los animales, plantas y sus entornos nevados, es relativamente nuevo.

"En comparación con otros hábitats, ecosistemas de nieve han sido escasamente explorado", dice Pauli. "Eso es un descuido importante, teniendo en cuenta la importancia de la nieve es en la vida de tantas especies."

More information.....

http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=136986&WT.mc_id=USNSF_51&WT.mc_ev=click

Snow sustains species from frogs to birds to mammals in winter and beyond A secret world, unseen by most humans, is alive just beneath the winter snow. Credit and Larger Version January 5, 2016 Snow covers some 40 percent of Earth's land masses year in and year out. And, as scientists are discovering, snow is critical to animals and plants that live in northern latitudes, as well as those in far southern latitudes like Patagonia at the tip of South America. It ensures their -- and our -- survival. "Without snow, plant and animal life would be completely different," says biologist Jonathan Pauli of the University of Wisconsin-Madison. Pauli and scientists such as Ben Zuckerberg, also of the University of Wisconsin-Madison, are members of a new breed of researchers called winter ecologists. The field, which focuses on relationships among animals, plants and their snow-covered environments, is relatively new. "Compared to other habitats, snow ecosystems have been barely explored," Pauli says. "That's a major oversight, considering how important snow is in the lives of so many species." That list of species includes humans. Our spring and summer water resources depend heavily on meltwater from winter snows.   Nature's igloo   With a grant from the National Science Foundation (NSF)'s MacroSystems Biology Program, Pauli and Zuckerberg conduct research on what's called the subnivium, a seasonal and sensitive refuge beneath the snow's surface that's insulated and maintains a constant temperature. It's nature's igloo. "We know very little about plants and animals that survive winter beneath the snow," says Liz Blood, a program director in NSF's Directorate for Biological Sciences. "This research is taking an innovative approach to studying the consequences of climate change on overwintering success of plants and animals in the subnivium." What will happen if snow disappears in a warmer world? Pauli and colleagues believe warming winters caused by climate change reduce the subnivium's duration, depth and insulation. As a result of these altered conditions, they report in the journals Frontiers in Ecology and the Environment and PLOS One, the subnivium is showing more temperature variability and decreased -- not increased -- temperatures. Without enough snow, temperatures fall due to loss of insulation. "In a warmer world with less snow, winter soils would be colder because the insulating snow layer on top is reduced," says Henry Gholz, a program director in NSF's Division of Environmental Biology. "That has implications for farmers planting crops in spring, as well as for the many burrowing mammals, microbes and insects that overwinter in snow." The changes will have important implications for species that need the subnivium to survive, Zuckerberg says, "and will lead to large-scale shifts in their ranges." Everything depends, adds Pauli, on having enough snow.   No two snowflakes, nor snows, alike   As children learn, no two snowflakes form in quite the same way. And, as northern peoples like the Inuit of Alaska know, nor are there two snows, nor snowfalls, exactly alike. Annui, api, pukak. Qali, siqoq, kimoagruk. Upsik, qamaniq, siqoqtoaq -- these are the snow-words of the Inuit of northwestern Alaska. They've also become terms for snow used by many winter ecologists. Perhaps you're reading this article nestled by a roaring fire, protected from the elements in a warm den or living room. Outside your icicle-laden window, you notice falling snow: annui. Should you awaken one morning to snow covering the ground, you're seeing api. Pukak is the layer at the bottom of a snow bank, "which is critical to the small mammals that live there in winter," Pauli says. "There's an entire world going on beneath the snow that we can't see." Qali snow, nature's paintbrush, frosts the limbs of trees, and is no less ecologically important, providing shelter to birds and other animals seeking escape from the cold. The golden-crowned kinglet, for example, a tiny songbird of northern forests, survives winter's frigid nights because it can huddle under qali on conifer branches. Trees whose branches are iced-over are said to be covered with kanik, and snow that swirls in whorls is siqoq. When those snows form drifts, they're known as kimoagruk. Winter winds may eventually compact snow into a hard surface, called upsik, which offers a highway to animals like deer and moose that navigate best on hard-packed surfaces. Qamaniq leaves hollows around the bases of trees; it offers shelter to birds such as ruffed and spruce grouse, and to snowshoe hares. As spring arrives, it brings siqoqtoaq, "the sun crust" in the surface layer of snow that melts by day and re-freezes by night. In siqoqtoaq, microbes called snow algae, dormant during early winter months, bloom bright red and green. Species need snow   Gazelles in the Gobi Desert in northern China and southern Mongolia rely on "snow mines," oases of water from melting snows buried beneath the sand. Other species use snow in ways that are just as resourceful. Tiny mammals like shrews don't migrate but spend their winters in the subnivium. River otters slide down snowbanks and through openings in ice-covered waters to find fish. Gangly moose use snow as a footstools, to better reach tender shoots at the ends of branches. And some of the tiniest forms of life -- fungi and other microorganisms that live in and under the snow -- remain active throughout the winter. Without fungi, wildflowers' summer bloom in mountain environments wouldn't happen. Fungi increase their metabolism as winter progresses, releasing nutrients from their by-products as snow melts in spring.   Snow research in a greenhouse   Since plants and animals depend on snow cover in winter, what lies ahead when the global climate's increased warmth has reduced snow levels? "We should be very concerned about these changes," Pauli says. He, Zuckerberg, Warren Porter of the University of Wisconsin-Madison and Brian McMahon of Operation Fresh Start are working to assess climate change effects on the sensitive subnivian habitat. Using micro-greenhouses placed at sites in Wisconsin, Minnesota and Michigan, the ecologists mimic climate conditions predicted for the Great Lakes region by 2050. The micro-greenhouses automatically open when it snows, allowing a subnivium to form inside. The research reveals how future subnivium conditions will affect the physiology, survival and distribution of species dependent on this realm-beneath-the-snow. To date, micro-greenhouse experiments show that although ambient temperature within a micro-greenhouse is set at 5 degrees Celsius warmer than the temperature outside the greenhouse, "the natural daily minimum subnivium temperature drops significantly lower inside," Pauli says. Translation: less snow is falling. Without snow cover and its insulation, the greenhouse interior -- and its subnivian inhabitants such as hibernating amphibians -- are exposed to the winter cold. "Our findings suggest climate change could have considerable effects on the refuge quality of the subnivium," Pauli says. The future for plants and animals, including us, say Pauli and Zuckerberg, looks brightest as a white, not green, winter. --  Cheryl Dybas, NSF (703) 292-7734  cdybas@nsf.gov Related Programs MacroSystems Biology Related WebsitesNSF Grant: Warming Winters and Regional Implications for the Subnivean Climate: http://www.nsf.gov/awardsearch/showAward?AWD_ID=1340632&HistoricalAwards=false NSF Discovery: The Search for White Gold: Snowmelt: http://nsf.gov/discoveries/disc_summ.jsp?cntn_id=127580 NSF Discovery: The Depths of Winter: How Much Snow Is In Fact On the Ground?: http://www.nsf.gov/news/news_summ.jsp?cntn_id=123106 NSF Discovery: Dust-on-Snow: On Spring Winds, Something Wicked This Way Comes: http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=116707 NSF Discovery: Inside a Snowstorm: Scientists Obtain Close-Up Look at Old Man Winter: http://www.nsf.gov/news/news_summ.jsp?cntn_id=118365 NSF Discovery: A Tree Stands in the Sierra Nevada: The Link Among Conifers, Snowmelt and Water Resources:  http://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=125091&org=NSF Video: Snow in warming winters:  https://vimeo.com/134676387 The willow ptarmigan is a common resident of the subnivium; it uses snow as an insulating blanket. Credit and Larger Version How do wood frogs survive being frozen in winter? By living under the snow surface. Credit and Larger Version A winter ecologist peers beneath the subnivium and into a porcupine den. Credit and Larger Version The depth and extent of snow cover in North America are rapidly decreasing, affecting the subnivium. Credit and Larger Version A micro-greenhouse can reproduce climate change's effects on the world under snow. Credit and Larger Version

the National Science Foundation (NSF)
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