22 May 2015:
Many Trees in Southeast U.S.
Closely Related to Tree Species in Asia
DNA studies show that more than half the trees and shrubs in southern Appalachia can trace their ancestry to eastern Asia.
A flowering dogwood tree
Based on molecular studies of more than 250 species of trees and shrubs from Georgia to Virginia, researchers at Duke University found close ties between East Asian species, such as dogwoods, and species in the southeastern U.S. Forests throughout the northern hemisphere were joined together by the supercontinent Laurasia as recently as 180 million years ago. Then, as the great northern land mass broke into continents, eras of glaciation wiped out various tree species. Forest remnants hung on in China, Japan, small parts of Europe, and Appalachia, which explains the similarity in tree species. The research was published in the American Journal of Botany.
Interview: A Grassroots Effort to
Save Africa’s Most Endangered Ape
The Cross River gorilla population, with fewer than 300 individuals, has been pushed to the brink of extinction in equatorial
Africa. At the center of the fight to save this beleaguered ape population is Nigerian scientist Inaoyom Imong, who comes from the region and knows its forests — and its people — intimately. In a Yale e360
interview, Imong describes the various pressures that have reduced populations of this gorilla subspecies and explains how a few thousand people living in rural Nigeria and Cameroon hold the key to saving this magnificent ape.
Read the interview.
20 May 2015:
Many Wind Turbines Installed
In Critical Bird Habitat, Group Says
More than 30,000 wind turbines in the U.S. have been installed in areas critical to the survival of federally protected birds and
an additional 50,000 turbines are planned for similar areas, according to
the advocacy group American Bird Conservancy (ABC). Those figures include 24,000 turbines in the migration corridor of the rare whooping crane and nearly 3,000 turbines in breeding strongholds for greater sage grouse
, a species that has already declined by up to 80 percent in recent decades due to habitat loss, ABC says. The group is asking the federal government to regulate the wind industry with regard to its impacts on birds. Areas of "critical importance," where federally protected birds face the highest levels of risk, comprise just 9 percent of the land area of the U.S. and should be avoided in wind development, ABC says.
06 May 2015:
Backyard Bird Feeders May Put
Native Species at a Disadvantage, Study Says
Backyard bird feeders tend to attract aggressive, introduced bird species while discouraging native species that eat
A sparrow eats at a backyard bird feeder.
insects and nectar, essentially restructuring urban bird communities and skewing them toward non-native species, a new study
says. Data based on nearly 600 surveys of 18,000 birds from 33 species in New Zealand show that yards with bird feeders tended to attract non-native omnivores such as house sparrows, spotted doves, and blackbirds. Outdoor areas without bird feeders had significantly more native bird species such as the grey warbler, whose diet consists mainly of insects. Although the population trends reversed when feeders were removed, the researchers say that over time bird feeders in urban areas likely give non-native bird species a competitive and reproductive edge over native species.
04 May 2015:
First Nations and B.C. Set
North America's Largest Ocean Protections
The Canadian province of British Columbia and 18 coastal First Nations have released marine plans
to bring the northern
Area encompassed by protection plans.
Pacific Coast of British Columbia under ecosystem-based management, completing the largest ocean plan to date anywhere in North America. The ecosystem-based approach was designed to protect the marine environment while sustaining coastal communities whose culture and commerce depend on a healthy ocean, officials say. The area under the protection plans lies between Haida Gwaii archipelago on the north coast of B.C. to Campbell River on Vancouver Island — a span of nearly 40,000 square miles, equivalent to a 200-mile-wide swath from San Francisco to San Diego. The plans were based on input from a variety of stakeholders — renewable energy developers, conservationists, aquaculture companies, small-boat fishermen, and traditional and local community members — and the best available science, officials say.
01 May 2015:
One in Six Species Facing
Extinction in Current Climate Trajectory
Future increases in global temperatures will threaten up to one in six species if current climate policies are not modified,
Nursery frogs are among the species most at risk.
according to new research
published in the journal Science
. Global extinction rates are currently at 2.8 percent, the study notes. If global average temperature rises by only 2 degrees C — a benchmark that many scientists think is no longer attainable — the extinction rate will rise to 5.2 percent, the study found. If the planet warms by 3 degrees C, the extinction risk rises to 8.5 percent. And if the current, business-as-usual trajectory continues, climate change will threaten one in six species, or 16 percent, the study says. The risk of species loss is most acute for areas that have unique climate ranges — particularly South America, Australia, and New Zealand — yet those regions are the least studied, the author notes.
27 Apr 2015:
Oceans Are the World's
Seventh Largest Economy, New Report Says
The world's oceans are worth an estimated $24 trillion and produce $2.5 trillion annually in goods and services, according to
Coral reefs are threatened by ocean acidification.
by WWF, Boston Consulting Group, and the Global Change Institute. If the global ocean ecosystem were a single nation, it would represent the world's seventh largest economy, the report says, providing goods such as fish catches and aquaculture and services such as coastal storm protection, shipping, and tourism. The oceans' assets are dwindling, though, due to threats such as ocean acidification, over-exploitation of fish stocks, and degradation of coral reefs, which could disappear completely by 2050, according to research cited in the report. The trends could be reversed, the report says, if global governments take strong action to curb climate change and if coastal countries make swift efforts to protect nearby marine ecosystems.
15 Apr 2015:
Entries Invited for e360
Contest For Best Environmental Videos
The second annual Yale Environment 360 Video Contest is now accepting entries. The contest honors the best environmental videos. Entries must be videos that focus on an environmental issue or theme, have not been widely viewed online, and are a maximum of 15 minutes in length. Videos that are funded by an organization or company and are primarily about that organization or company are not eligible. The first-place winner will receive $2,000, two runners-up will each receive $500, and all winning entries will be posted on Yale Environment 360
. The contest judges will be Yale Environment 360
editor Roger Cohn, New Yorker
writer and e360
contributor Elizabeth Kolbert, and documentary filmmaker Thomas Lennon. The deadline for entries is June 15, 2015.
14 Apr 2015:
Canada Could Lose 70 Percent
Of Glaciers by End of Century, Study Finds
British Columbia and Alberta could lose 70 percent of their glaciers by the end of the 21st century, creating major problems
Berg Glacier in British Columbia
for local ecosystems, power supplies, and water quality, according to a study in Nature Geoscience
. Wetter coastal mountain regions in northwestern British Columbia are expected to lose about half of their glacial volume, the researchers found, but the Rocky Mountains, in the drier interior portion of Canada, could lose 90 percent of their glaciers. “Soon our mountains could look like those in Colorado or California and you don’t see much ice in those landscapes,” said Garry Clarke, lead author of the study. Alberta and British Columbia have more than 17,000 glaciers and they play an important role in hydroelectric power production. The glaciers also contribute to the water supply, agriculture, and tourism, but the greatest impact of their loss could be on freshwater ecosystems, the researchers say.
Canine Conservation: Using Dogs
In War Against Poachers in Kenya
In Kenya’s Ol Pejeta Conservancy — home to some of the most endangered subspecies of rhinoceros — officials are deploying a new weapon to combat rampant rhino poaching: highly trained K-9 dogs. Six Belgian Malinois tracking and attack dogs are now working with Kenyan rangers to protect tiny populations of northern white rhinos and eastern black rhinos, which have been hunted to near-extinction by poachers seeking rhino horn for supposed medicinal purposes. Overseen by a former military dog instructor with the U.K. Royal Army Veterinary Corps, the K-9 units are being deployed not only in Ol Pejeta but also in a Tanzanian park that has been plagued by poaching. Read the article.
Natural Filters: Mussels Deployed
To Clean Up Polluted Waterways
Conservationists and scientists in the U.S. and Europe are working to re-establish declining or endangered freshwater mussel
An Eastern elliptio mussel
populations so these mollusks can use their natural filtration abilities to clean up pollution in waterways. One such program has been established on the U.S.’s Delaware River, where environmentalists and biologists are reseeding mussel populations in the more polluted sections of the river and in tributary streams. Water companies have expressed interest in these programs in the hope that large populations of freshwater mussels might eventually relieve the companies of some of the burden and expense of mechanical water filtration.
Read the article.
26 Mar 2015:
Pollution May Trigger Heath
Problems in Deep-Water Fish, Study Says
Fish living in deep waters near continental slopes have tumors, liver pathologies, and other health problems that may be
Microscopic abnormality in a black scabbardfish liver.
linked to human-generated pollution, researchers report
in the journal Marine Environmental Research
. They also describe the first case of a deep-water fish species with an “intersex” condition — a blend of male and female sex organs. In the study, which looked at fish in the Bay of Biscay west of France, researchers found a wide range of degenerative and inflammatory lesions in fish living along the continental slope, which can act as a sink for heavy metal contaminants and organic pollutants such as PCBs and pesticides. The fish that live in these deep waters are often extremely long-lived — some can be 100 years old — which allows them to bioaccumulate such contaminants. However, linking the fishes' physiological changes to pollution is preliminary at this time, the researchers said.
24 Mar 2015:
Extreme Forest Fragmentation
Documented in Comprehensive New Study
Fragmentation of the world’s forests has become so severe
that 70 percent of remaining woodlands are now within 1 kilometer of a road or other form of development, according to a new study
. Using the world’s first high-resolution satellite map of tree cover, as well as an analysis of seven long-term fragmentation studies, researchers showed that the ongoing destruction of global forests is decreasing biodiversity by as much as 75 percent in some areas and adversely affecting the ability of forests to store carbon and produce clean water. The study, published in the journal Science Advances
, found that 20 percent of the world’s forests are just 100 meters from a human-created “edge.” Even many parks and protected areas have undergone fragmentation, the study said. The few remaining large, virgin tracts of forest are found in parts of the Amazon, Siberia, Congo
, and Papua New Guinea.
Back from the Brink: Success Stories
Of the U.S. Endangered Species Act
A small minnow known as the Oregon chub
recently became the 29th species to recover after being listed as endangered under the U.S. Endangered Species Act and the first fish to ever join those ranks. The Endangered Species Act
, signed into law in 1973, is widely considered one of the most important pieces of U.S. environmental legislation ever enacted. This e360
photo gallery highlights the 21 species
native to the United States, including the bald eagle (above), that have made recoveries strong enough to be removed from the endangered list.
Read more | View gallery of recovered species
13 Mar 2015:
Obama Administration Doubles
Size of Key California Marine Sanctuaries
The Obama administration yesterday expanded protections for two major marine sanctuaries off the coast of San Francisco,
Sea stars on the shores of Gulf of the Farallones National Marine Sanctuary
California — the Gulf of the Farallones and Cordell Bank national marine sanctuaries — doubling their extent
to create a protected area the size of Connecticut. The sanctuaries encompass a wide array of habitats, including estuarine wetlands, rocky intertidal habitat, open ocean, and shallow marine banks, as well as areas of major upwelling where nutrients come to the surface and support a vast array of marine life, the National Oceanic and Atmospheric Administration said. The expansion comes after more than a decade of of community action, scientific research, and political effort. Although it was nearly unanimously supported by San Francisco Bay Area residents, the expansion faced strong opposition
from the oil and gas industry, which will now be barred from drilling in the region.
09 Mar 2015:
Blue Crabs Are Moving Into
Gulf of Maine's Warming Waters, Study Says
Blue crabs have become the first documented commercially important species to move into the Gulf of Maine
Blue crab caught 80 miles north of its historic range.
a migration that may be driven by climate change, according to ecologist David Johnson of the Marine Biological Laboratory. Although the historic northern limit of the blue crab is Cape Cod, Massachusetts, scientists and resource managers have observed blue crabs as far north as northern Maine and Nova Scotia, Canada. Johnson says that warmer ocean temperatures in 2012 and 2013, which were 1.3 degrees C higher than the previous decade's average, allowed the crabs to move north. In the 1950s, blue crabs were observed in the gulf during a time of warmer waters, Johnson notes in the Journal of Crustacean Biology
, but once the gulf returned to average temperatures, the crabs disappeared. He added that "recent observations of blue crabs may be a crystal ball into the future ecology of the Gulf of Maine."
Interview: What Lies Behind the
Surge of Deforestation in Amazon
Ecologist Philip Fearnside has lived and worked in the Brazilian Amazon for 30 years and is one of the foremost authorities on
deforestation in the world’s largest tropical forest. A professor at the National Institute for Research in the Amazon, Fearnside is now watching with alarm as, after a decade of declining deforestation rates, the pace of cutting in the Amazon is on the rise again. In an interview with Yale Environment 360
, Fearnside explains the factors behind the resurgence in deforestation and warns that the Amazon will sustain even graver losses if Brazil’s newly re-elected President Dilma Rousseff — who is backed by large landowners and agribusiness interests — doesn’t change course.
Read the interview.
04 Mar 2015:
Hurricanes Help Spread
Invasive Marine Species, Researchers Find
Hurricanes can accelerate the spread of invasive marine species — in particular the lionfish, a hardy invader that
An adult lionfish
can overrun ecosystems and devastate native biodiversity — according to research
published in the journal Global Change Biology
. Researchers found that hurricanes, by forcing changes in strong ocean currents, have helped lionfish spread from the Florida Straits to the Bahamas since 1992, increasing the spread of the species by 45 percent and their population size by 15 percent. Normally the currents pose a barrier to the transport of lionfish eggs and larvae, the researchers say, but as a hurricane passes, the current shifts and carries lionfish larvae and eggs from Florida to the Bahamas. Scientists say climate change may increase the frequency or intensity of future storms, which could further accelerate the spread of marine invasives.
02 Mar 2015:
Emperor Penguins Had Few
Refuges During Last Ice Age, Study Finds
The Ross Sea and certain other Antarctic waters likely served as refuges for the three emperor penguin populations that
survived during the last ice age, when large amounts of ice made much of the rest of Antarctica uninhabitable, according to a new study
published in the journal Global Change Biology
. The findings suggest that extreme climatic conditions on the continent during the past 30,000 years created an evolutionary "bottleneck" that is evident in the genetic material of modern-day emperor penguins, a species known for its ability to thrive in icy habitats. But during the last ice age, the Antarctic likely had twice as much sea ice, the researchers say, leaving only a few locations for the penguins to breed — distances from the open ocean (where the penguins feed) to the stable sea ice (where they breed) were too great. The three populations that did manage to survive may have done so by breeding near areas of ocean that are kept free of sea ice by wind and currents, the researchers suggest.
25 Feb 2015:
Global Pesticide Map Shows
Large Areas of High Water Pollution Risk
Streams across roughly 40 percent of the planet's land area are at risk of pollution from pesticides, according to
Risk for pesticide pollution
published in the journal Environmental Pollution
. Surface waters in the Mediterranean region, the United States, Central America, and Southeast Asia are particularly at risk, according to the study, which produced the first global map of pesticide pollution risk. Taking into account weather data, terrain, pesticide application rates, and land use patterns, the map shows that the risk of pesticide pollution is relatively low in Canada and northern Europe but increases closer to the Equator. More areas are likely to face high pesticide pollution risk as global population grows and the climate warms, the researchers say, because agricultural activity and crop pests will both intensify, likely requiring even higher rates of pesticide use.
24 Feb 2015:
New Map Shows Background
Noise Levels Across the United States
A new map by the U.S. National Park Service (NPS) shows America's quietest and noisiest places. The park service
mapped background noise levels across the country on an average summer day using 1.5 million hours of acoustical data. The quietest areas of the country, such as Yellowstone National Park in Wyoming, are shown in deep blue on this map and are likely as quiet now as they were before European colonization, NPS researchers say. They are collecting the data as part of an effort to determine whether and how wild animals are affected by anthropogenic noise pollution. Owls and bats, for example, rely on hearing faint rustles from insects and rodents, and scientists think human-driven noise could be drowning out those subtle signals in many areas of the country.
18 Feb 2015:
Disease-Carrying Ticks Expand
Range and Emerge Earlier in Warmer Climate
Warmer spring temperatures in the northeastern U.S. are leading to shifts in the emergence of ticks that carry Lyme
Adult blacklegged tick
disease, and milder weather is allowing ticks to spread into new geographic regions, according to findings published
this week. The data — which span 19 years and include observations of more than 447,000 ticks — show that the insects emerged nearly three weeks earlier in warmer years. And when fall temperatures were mild, a smaller percentage of larval ticks entered dormancy and waited until spring to feed, the study found. "Here in the Northeast, warming is already having an effect, and people need to be tick-vigilant before May, as potentially infected nymphal ticks are searching for their blood meals earlier and earlier," said co-author Richard S. Ostfeld, an ecologist at the Cary Institute.
Interview: Why Ocean Health Is
Better, and Worse, Than You Think
In a recent groundbreaking study in Science
, a group of marine experts — including lead author Douglas
McCauley — delivered a sobering message: The world’s oceans are on the verge of major change that could cause irreparable damage to marine life. While ocean ecosystems are still largely intact, the marine world is facing unprecedented disturbances, including ocean acidification and habitat destruction from deep-sea mining, oil and gas drilling, development, and aquaculture. In an interview with Yale Environment 360
, McCauley discusses the parallels of the loss of wildlife on land and at sea and explains why creating marine reserves and establishing international ocean zoning regulations would help blunt the damage from a looming “marine industrial revolution.”
Read the interview.
12 Feb 2015:
Mange in Yellowstone Wolves
Documented Through Thermal Images
Researchers with the U.S. Geological Survey are using thermal video cameras to study how mange is affecting
Thermal image of a wolf with mange on its legs.
wolves in Yellowstone National Park, as shown in this video
. Mange is a highly contagious skin disease caused by mites that burrow into the skin of dogs and wolves, causing infections, hair loss, irritation, and intense itching. The urge to scratch can be so overwhelming that the wolves neglect resting and hunting, researchers say
, leaving them vulnerable to hypothermia, malnutrition, and dehydration, which can eventually lead to death. Thermal imagery allows scientists to document the extent of hair loss and the actual loss of heat associated with different stages of infection. Red patches on a wolf's legs, as shown in this image, indicate rapid heat loss caused by mange.
As Arctic Ocean Ice Vanishes,
Questions About Future Fishing
With the steady retreat of sea ice in the Arctic Ocean opening up vast areas of this long-frozen marine basin, a key resource
A Russian fishing vessel trawls the Arctic Ocean.
issue is now emerging: the future of fisheries, especially in central Arctic waters. What species are migrating into the region as sea ice disappears? And could the heart of the Arctic Ocean sustain a commercial fishery in the coming decades? These issues were central to a discussion at a recent conference on the fisheries of the central Arctic Ocean. With more southerly fish species migrating into warmer and increasingly ice-free regions of the Arctic Ocean, officials from the U.S. and Canada say it’s important to negotiate an international agreement on fishing before allowing fisheries to open.
Read the article.
06 Feb 2015:
Maine’s Iconic Lobsters
Face Threats From Ocean Acidification
Maine’s lobster fishery, worth $1.7 billion
to the state and a vital source of employment, could be
threatened by acidifying ocean waters
A Maine lobster
and rising sea temperatures, according to a new report. The report
, issued by a state commission, called increasingly acidic ocean waters — caused by the absorption of CO2 from the atmosphere — an “urgent matter” that needs to be addressed by state and local governments and the fishing infustry. Facing the prospect that increasing acidity could interfere with the ability of lobsters to make their shells, the commission set forth a handful of goals, including a stepped-up research effort on the acidification of the coast’s waters and its impact on crustaceans. Maine lawmakers have already introduced legislation for limits on industrial and agricultural runoff, which contribute to coastal water acidification.
04 Feb 2015:
Plant-Like Sea Slug Can Steal
Genes From its Food, Researchers Report
The emerald green, leaf-shaped sea slug known as Elysia chlorotica
can live for months at a time by
photosynthesizing its own food, like a plant does, but until recently scientists did not understand how the slug acquired and maintained this rare ability. A recent report in the journal The Biological Bulletin
shows that the slug steals genes and chloroplasts
— the cellular machinery that converts sunlight into food — from algae that the slug eats. Genes lifted from the algae can maintain cholorplasts in the slug for up to nine months, the researchers say — much longer than the chloroplasts would last in the algae themselves. Moreover, the slug can pass on those stolen genes to its offspring. The process is a mechanism of rapid evolution, says one of the study's authors.
28 Jan 2015:
Camera Trap Records Rare
Glimpse of African Golden Cat Hunting
An African golden cat, one of the least known and most elusive wild cats on the planet, has been filmed hunting in
African golden cat
Kibale National Park, Uganda, for the first time, scientists say. In the video
, which was recorded by a camera trap, an African golden cat darts toward a group of red colobus monkeys feeding on a tree stump. The cat's attack is nearly too fast to be seen in real-time, but viewing the footage in slow-motion highlights the cat's swiftness and accuracy — even though its ambush failed to land a meal. The African golden cat is found only in the forests of central and West Africa, and it is threatened across its range by intensive bushmeat hunting and habitat loss. Researchers say the video provides important details about the African golden cats' hunting behavior that have never before been directly observed.
27 Jan 2015:
Pollinator Loss Could Put
Poor Nations at Risk for Malnutrition
Declining pollinator populations could leave as many as half of the people in developing countries facing nutritional deficiencies, according to
researchers from the University of Vermont and the Harvard School of Public Health. In the study — the first to link pollinator declines directly to human nutrition — researchers collected detailed data about people's daily diets in parts of Zambia, Mozambique, Uganda, and Bangladesh. They found that in Mozambique, for example, many children and mothers are barely able to meet their needs for micronutrients, especially vitamin A, which is important for preventing blindness and infectious diseases. Fruits and vegetables were an important source of that nutrient for many people in the study, and those crops are highly dependent on pollinators, researchers say — for example, yields of mangoes, which are high in vitamin A, would likely be cut by 65 percent without them. Pollinator losses might also lead to folate deficiency, they say, which is associated with neural tube defects.
23 Jan 2015:
South Africa Relocates Rhinos
After Record Number Were Poached in 2014
Unable to curb poaching of rhinos within its borders, the South African government has relocated 100 rhinos
A white rhino in Kruger National Park.
in an effort to stem the illegal slaughter of the animals, Reuters reports. For security reasons, officials did not reveal to which countries the rhinos had been relocated. An additional 56 rhinos were moved from poaching hotspots within South Africa's Kruger National Park — where two-thirds of the killings happen — to an "intensive protection zone" within Kruger, officials said. Poachers killed a record number of the animals in South Africa last year — 1,215 rhinos, up 20 percent from the 2013 total — and 49 have been killed so far this year. The animals are hunted intensely because their horns, which some Asian cultures incorrectly believe contain medicinal properties, are worth an estimated $65,000 per kilogram on the black market.