By Amanda Kolson Hurley
In the 1960s, America fell in love with a new tree: the Bradford pear. Cultivated from Asian stock by scientists at the U.S. Department of Agriculture, Bradford pears display clouds of pretty blossoms in the spring and garnet leaves in the fall, and are hardy enough to grow just about anywhere. Thinking they had found the perfect ornamental tree, homeowners and public-works departments planted Bradford pears up and down the nation’s streets for decades, especially in the East, South, and Midwest.
Then the relationship soured. Bradfords are apt to split and break during storms, and they have a short life span, only 15 or 20 years. Although they are technically sterile, the trees cross-pollinate with other cultivars of the Callery pear species (Pyrus calleryana), producing fruit that splats all over sidewalks. And despite their delicate appearance, the blossoms emit a foul odor that’s been compared to rotting fish (among other things).Cities and states are trying to remove Bradford pears‚ but the “weed trees” have already intruded deep into some forests, a biologist warns.
Once admired for its hardiness, the Bradford pear is now considered an invasive species, which grows even in poor conditions, proliferates fast—thanks to birds that dine on its fruit and spread the seeds—and crowds out native species.
Cities are trying to put an end to the tree’s mischief. Pittsburgh’s Urban Forest Master Plan prohibits planting Bradford pears. This March, Fayetteville, Arkansas, started offering a bounty to anyone who cuts one down. (They can get a free native tree to replace it.)
The bad news is it’s not only in developed areas where the trees threaten to choke biodiversity. Theresa Culley, head of the Department of Biological Sciences at the University of Cincinnati, warns that wild Bradfords and other kinds of Callery pears are making inroads into Eastern forests.
by Elyse Catalina, University of Maine
A mouse scampers through the forest, stopping suddenly at the sight of a tree seed on the ground. A potential meal. And a dilemma.
The mouse must decide if it should eat the seed immediately. Or hide it in a safe place for consumption when food is scarce. Or pass it up in hopes of something better.
Many factors determine what the mouse will do next, including how abundant the seeds are and if the rodent is a fan of that variety.
Personality is another element that might play a role in what the mouse decides, according to a University of Maine researcher.
How animals react to an environment that is transforming due to human behavior and climate change is at the core of research being conducted by Alessio Mortelliti, an assistant professor of wildlife habitat ecology at UMaine.
One study Mortelliti and his students are pursuing focuses on how individual personalities of small mammals affect their response to global change.
Like humans, animals have a personality, according to Mortelliti.
“Anyone that has a pet knows they have a personality,” he says. “It’s the same for squirrels, mice and voles.”
Within a species, individuals can be aggressive or shy, more or less social, Mortelliti explains.
“We’re looking at how this individuality—their own way of being—affects the way they respond to changes in their environment made by humans,” he says of wild small mammals.
When a mouse finds a seed, the decision it makes affects more than the mouse. If the seed is eaten immediately, any chance of a plant sprouting from that seed is gone. If the mouse decides to move and store the seed, a plant has a chance to grow.
Mortelliti believes that by modifying the environment, humans may be favoring certain personality types over others and, in turn, altering the course of evolution and the shape of the forest.
By Liz Langley
Green spaces within cities can lessen the impact of artificial light on bats, a new study says.
YOU’D THINK HALLOWEEN would be the battiest time of the year, but these winged mammals merit a second annual celebration.
In honor of National Bat Appreciation Day, we’re taking a look at urban bats and how they manage to live among us. (Get the truth behind six bat myths.)
Excessive artificial lighting, also called light pollution, can have a negative effect on many nocturnal animals, for instance by disorienting them or interfering with their reproduction.
But that hasn’t stopped bats from making their homes in cities. For instance, 18 of Germany’s 25 bat species live in Berlin, which is also made up of 20 percent forest.
“Trees provide a lot of benefits for bats,” including roosts, shelter from wind and predators, and better foraging opportunities, says Tanja M. Straka, a researcher at the Leibniz Institute for Zoo and Wildlife Research.
By Martha Quillin
Days of wind and rain snapped or toppled trees throughout the Croatan National Forest, both near the NC coast. Among the trees felled were long leaf pines that were home to some of the forests’ most celebrated residents: endangered red-cockaded woodpeckers.
Hurricane Florence, one of the costliest storms ever to hit the U.S., damaged or destroyed tens of thousands of homes when it made landfall in September. Not all of them belonged to humans.
Days of wind and torrential rain snapped or toppled trees throughout the Croatan National Forest and on Marine Corps Base Camp Lejeune, both near the coast. Among the trees felled were long leaf pines that were home to some of the forests’ most celebrated residents: endangered red-cockaded woodpeckers.
The 160,000-acre forest, stretching across Carteret, Jones and Craven counties, is home to about 112 “clusters” of the little black-and-white birds. A cluster usually consists of a mating pair and up to four of the previous year’s offspring. Researchers believe the Croatan has about 300 individual birds, making it the largest site that far east and west. There are an estimated 16,250 red-cockaded woodpeckers total across 11 states, with the largest population being on Fort Bragg.
By Dan Zukowski
A large chunk of the country’s forests were harmed in 2015 by wildlife—77 percent due to deer. Bringing back an apex predator could help staunch the bleeding.
From the peak of Mt. Rausu, a clear view of the Shiretoko Peninsula opens from the Okhotsk Sea on the west to the Pacific Ocean on the east. Below, a dense green boreal forest of conifers, maples, and birch hides hundreds of brown bears and 590,000 sika deer. Japanese wolves once roamed this wilderness but their primeval howls fell silent here, and throughout Japan, more than a hundred years ago.
Narumi Nambu is working to bring wolves back to Japan.
“An apex predator is essential for sustainability of an ecosystem, and in Japan it was a wolf,” she writes in an email. Nambu volunteers for the Japan Wolf Association. Her work earned her the “Who Speaks for Wolf” award at the International Wolf Symposium in Minnesota, where she recently spoke.
She explained that, without the presence of natural predators like wolves, two-thirds of Japan’s 30 national parks are showing signs of deer-induced injury.
Shiretoko National Park, a UNESCO World Heritage Site, has a deer problem, as does much of Japan. According to the most recent annual report by the Japan Forestry Agency, 8,000 hectares of the country’s forest were harmed in 2015 by wildlife—77 percent of it due to deer. All told, deer were responsible for $53 million in damage.
A study carried out by the IIRS has predicted a depletion of 9,007.14 square km (2.94 per cent) of forests in parts of Assam and Arunachal Pradesh by 2028.
A report published in the The Telegraph stated that the study – ‘Forest Cover Monitoring and Prediction in a Lesser Himalayan Elephant Landscape’ – published in the current issue of Current Science, says deforestation and loss of wildlife habitat in Upper Assam is likely to influence not only adjoining Bhutan and Arunachal Pradesh but Lower Assam as well. The IIRS is under the Indian Space Research Organisation (ISRO).
The report further stated that scientists involved in the study said they monitored the depletion of forest cover in parts of Assam and Arunachal Pradesh over 42,375 square km in an elephant landscape falling in the Lesser Himalaya in the North East. The study, which covered a vast elephant landscape spread across West Bengal-Assam, Assam-Bhutan and Assam-Arunachal Pradesh borders in the lesser Himalayas, found a loss of about 7,590 square km (17.92 per cent) of forest cover from 1924 to 2009.
This was also found by US Army topographic maps (1924) and multi-date satellite images. The forest cover of 2028 was predicted using the 2000-2009 depletion of forests study and Cellular Automata Markov Model (CAMM). As elephants are long-ranging animals and are distributed across the landscape, it is important to carry out studies covering large areas to address the habitat status over time, which can be used for effective habitat conservation.
By Jade Boyd
Widespread logging and hunting have endangered virtually all of Madagascar’s 100-plus species of iconic lemurs, and a new study by Rice University ecologists illustrates how saving the animals may also be key to saving the island’s largest trees.
“Forest loss is a huge problem in Madagascar right now, but our study suggests that just saving the trees is not enough,” said Amy Dunham, associate professor of biosciences at Rice and co-author of a paper appearing online today in a special issue of the International Journal of Primatology. “Not only are we facing the loss of these unique, charismatic animals, we’re also losing their role in the ecosystem. Without lemurs, the rainforests themselves will change because the lemurs alone disperse the seeds of many of the forests’ largest hardwoods.”
The study builds upon nearly a decade of collaborative work by Dunham and lead author Onja Razafindratsima at the island nation’s Ranomafana National Park.
Lemurs mostly eat fruit, and for many of the largest trees in Madagascar, lemurs are the only animals large enough to ingest the seeds of their fruit. By dispersing seeds throughout the forest in their scat, lemurs serve as the unwitting gardeners of these large canopy trees.
A few more timber projects may move ahead on Montana state forests, even where they are in critical habitat for endangered species, under terms of a new state-federal conservation agreement. The U.S. Fish and Wildlife Service has released the final draft of an EIS that outlines management guidelines for more than 620,000 acres of state forests.
By Amit S Upadhye, Bengaluru, India
Backed by political leaders and anti social elements, the villagers living around the Cauvery Wildlife Sanctuary are resorting to attacks on forest officials. The attacks are on the rise after the recent shootout incident where a resident of Doddahalli was shot dead.
Fearing more attacks, the foresters have suspended patrolling duties in the sanctuary. The foresters who retaliated a shooting group and killed a poacher are now demanding police protection for them and their family members.
Wetlands and waterfowl in Canada’s boreal forest will be the beneficiaries of a new program launched by Ducks Unlimited Canada (DUC) and forestry sector leaders. The partnership is a visionary approach to sharing knowledge and resources to advance sustainable forest management and wetland stewardship in the boreal forest, an area that offers one of the greatest conservation opportunities in the world.
Under the ‘Forest Management and Wetland Stewardship Initiative’, the partners will work collaboratively on priority projects that integrate wetland and waterfowl conservation into ongoing forest management planning and field operations. The coalition will establish wetland conservation guiding principles and best management practices. These will support companies in achieving their forest management objectives and help them meet the criteria for forest certification programs.