Posted on May 22, 2014 by Bob Berwyn
Winter tule fogs in decline; no rest for the orchards
A peach orchard in Palisade, Colorado in full bloom.
FRISCO — The winter tule fog in California’s Central Valley may be fading with climate change, threatening part of the region’s multibillion dollar agricultural industy, according to a new study by University of California, Berkeley researchers,
High-value crops like almonds, pistachios, cherries, apricots and peaches all need a winter dormant period that is triggered and maintained by cold temperatures, but those are becoming less reliable as the global climate warms. The new study, published May 15 in the journal Geophysical Research Letters, found a 46 percent drop in the number of fog days between the first of November and the end of February during the 32-year study period. Continue reading
Filed under: agriculture, global warming, seasons | Tagged: agriculture, Central Valley, climate change, global warming, tule fog | Leave a comment »
Posted on March 21, 2014 by Bob Berwyn
UK researchers track flower preferences
By Summit Voice
FRISCO — Diversity in urban gardens can play a key role in sustaining pressured bumblebee populations, ecologists in the UK said this week, explaining the results of a study that measured bumblebee preferences for both native and non-native plants.
The most common species of bumblebee is not picky about a plant’s origin when searching for nectar and pollen. But other species, including long-tongued bees, favor plants native to the UK and Europe. Continue reading
Filed under: agriculture, Environment | Tagged: agriculture, bees, bumblebees, Environment, gardens | 1 Comment »
Posted on March 11, 2014 by Bob Berwyn
Many journalists spread their dip pretty thin when writing about climate
By Bob Berwyn
Chipotle’s guacamole is threatened by global warming. Or not, depending what you choose to believe.
Immediately dubbed the “Guacalypse” by some climate pundits, the news that Chipotle acknowledged potential global warming threats in a formulaic report to investors raised a stir.
You can melt the Arctic ice cap, raise sea level by 20 feet, but don’t mess with my guacamole, some would-be climate warriors said. But by the next day, NBC news was — almost snarkily — reporting that there’s no immediate threat to the world’s supply of avocados — at least not yet. Continue reading
Filed under: climate and weather, global warming | Tagged: agriculture, climate change, global warming, guacamole, journalism | 1 Comment »
Posted on November 9, 2013 by Bob Berwyn
‘Stewardship objectives may be strong, but they can be trumped or complicated by other economic, social, and environmental drivers’
By Summit Voice
FRISCO — Working with farmers on adopting realistic best management practices may be the best way to reduce the Gulf of Mexico dead zone, according to recent research from scientists at the University of Illinois. The researchers said that a 12-year action plan to improve conditions in the oxygen-starved area has shown few results, so they set out to identify some of the biophysical and social barriers. Continue reading
Filed under: Environment | Tagged: agriculture, Environment, Gulf of Mexico dead zone, Mississippi River, ocean hypoxic zones | Leave a comment »
Posted on October 14, 2013 by Bob Berwyn
A bumblebee forages in the Colorado high country.
Researchers look to track bees with tiny transmitters
By Summit Voice
FRISCO — With honeybee populations dwindling, bumblebees are becoming increasingly important as agricultural pollinators. To help gain a better understanding of bumblebee activity, researchers with Oregon State University want to track the insects with tiny sensors that will reveal how these native pollinators search for pollen, nectar and nesting sites.
The information will help researchers better understand how these insects assist in the production of crops that depend on pollination to produce fruits and vegetables, including blueberries, cranberries, strawberries, tomatoes and dozens of other staples.
“Lack of pollination is a risk to human food production,” said Sujaya Rao, an entomologist in OSU’s College of Agricultural Sciences and an expert on native bees. “With our sensors, we are searching for answers to basic questions, such as: Do all members of one colony go to pollinate the same field together? Do bumblebees communicate in the colony where food is located? Are bumblebees loyal as a group?” Continue reading
Filed under: agriculture, biodiversity, Environment | Tagged: agriculture, bumblebees, Colony collapse disorder, honeybees, pollinators | Leave a comment »
Posted on October 13, 2013 by Bob Berwyn
A wheat field in Upper Austria ripens under a summer sun.
Decline expected to continue for centuries, based on increased demand for agricultural land
By Summit Voice
FRISCO — Population growth and increased demand for agricultural land means forest will continue to shrink globally during the next couple of centuries before stabilizing at a lower level.
Just since 1990, about 170 million acres of forest have been lost, mainly in developing countries, according to a new study led by researchers with the University of Guelph.
The study is based on an analysis of global forest trends, used to develop a mathematical model showing future land use changes. The most likely model shows forests will decline from covering 30 per cent of Earth’s land surface today to 22 per cent within the next two centuries. Continue reading
Filed under: agriculture, Environment, forests | Tagged: agriculture, Environment, forests, global forest decline, PLOS ONE, Population growth | 1 Comment »
Posted on October 4, 2013 by Bob Berwyn
Bees gather on wildflowers in Breckenridge, Colorado.
Exposure can lead to mortality, California researchers say
By Summit Voice
FRISCO — Along with pesticides, heavy metals may also be contributing to the decline of honey bees in some regions, according to entomologists at the University of California, Riverside.
Their research found that four main forms of selenium found in plants cause mortality and delays in development in the honey bee. Study results appear in the Oct. 2013 issue of the journal Environmental Toxicology and Chemistry.
“Metal pollutants like selenium contaminate soil, water, can be accumulated in plants, and can even be atmospherically deposited on the hive itself,” said Kristen Hladun, the lead author of the study and a postdoctoral entomologist. “Our study examined the toxic effects of selenium at multiple life stages of the honey bee in order to mimic the chronic exposure this insect may face when foraging in a contaminated area.” Continue reading
Filed under: agriculture, biodiversity, Environment | Tagged: agriculture, Bee, Colony collapse disorder, Environment, honey bee decline, honey bees, pollution, Selenium | Leave a comment »
Posted on October 3, 2013 by Bob Berwyn
Apples ripen on a tree in Austria, which just experienced one of its warmest summers on record. bberwyn photo.
Research aims to understand how plants will respond to warming temperatures
By Summit Voice
FRISCO — As global warming throws the timing of plants and animals out of kilter, scientists are struggling to understand how that may affect critical human activities like agriculture.
As climate change brings warmer-than-usual winters to the U.S., plants may be more vulnerable to imprecise timing, and the tools traditionally used by farmers and horticulturists to predict seasons may be inadequate.
“How do we do a better job of seeing the climate the way the plants see it?” said James Clark, the Blomquist Professor of environment and biology at Duke University. With colleagues from the Marine Biological Lab at Woods Hole and the University of Georgia, Clark is working on building a statistical model of how trees make this decision. Continue reading
Filed under: agriculture, climate and weather, global warming | Tagged: agriculture, climate change, global warming, Harvard Forest, phenology | Leave a comment »
Posted on September 1, 2013 by Bob Berwyn
Fruit trees in mid-latitudes could face more pressure as global warming drives the spread of pests. bberwyn photo.
Trend poses food security threat
By Summit Voice
FRISCO — As global temperatures continue to rise, plant-killing pests are spreading toward the poles at the rate of almost two miles per year, posing a potential threat to food production in the world’s temperate crop–producing areas.
“If crop pests continue to march polewards as the Earth warms, the combined effects of a growing world population and the increased loss of crops to pests will pose a serious threat to global food security,” said Dr, Dan Bebber, of the University of Exeter.
Bebber and his colleagues carefully studied insect populations and climate trends, finding a strong relationship between increased global temperatures over the past 50 years and the expanding range of crop pests. The research was published Sept. 1 in Nature Climate Change. Continue reading
Filed under: agriculture, climate and weather, global warming | Tagged: agriculture, climate change, Environment, Food security, global warming, global warming impacts | Leave a comment »