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News articles on ecology
Mongabay.com news articles on ecology in blog format. Updated regularly.
(04/26/2010) Hornbills are one of Asia's most attractive birds. Large, colorful, and easier to spot than most other birds, hornbills have become iconic animals in the tropical forests of Asia. Yet, most people probably don't realize just how important hornbills are to the tropical forests they inhabit: as fruit-eaters, hornbills play a key role in dispersing the seeds of tropical trees, thereby keeping forests healthy and diverse. Yet, according to tropical ecologist and hornbill-expert Shumpei Kitamura, these beautiful forest engineers are threatened by everything from forest loss to hunting to the pet trade.
World failing on every environmental issue: an op-ed for Earth Day
(04/22/2010) The biodiversity crisis, the climate crisis, the deforestation crisis: we are living in an age when environmental issues have moved from regional problems to global ones. A generation or two before ours and one might speak of saving the beauty of Northern California; conserving a single species—say the white rhino—from extinction; or preserving an ecological region like the Amazon. That was a different age. Today we speak of preserving world biodiversity, of saving the 'lungs of the planet', of mitigating global climate change. No longer are humans over-reaching in just one region, but we are overreaching the whole planet, stretching ecological systems to a breaking point. While we are aware of the issues that threaten the well-being of life on this planet, including our own, how are we progressing on solutions?
Turning to the matrix: a more accurate way to predict extinction
(04/14/2010) According to most conservationists the globe is striding into the midst of the Sixth Mass Extinction. Species populations worldwide are dropping and in many cases species are vanishing all together due to pollution, climate change, poaching and hunting, overconsumption, invasive species, and exotic diseases, but no threat proves more pervasive and devastating for the world's species than habitat loss.
Forgotten species: the subterranean Gekko gigante
(04/08/2010) Travelers to tropical destinations are likely familiar with the gecko. Clinging to walls and ceilings of buildings—sometimes staring down at you from the bedroom ceiling or glancing at you quizzically from the bathroom door—the small adhesive-footed lizard could be aptly described in some tropical areas as ubiquitous. Despite the apparent commonness of some species, geckos are delightful lizards with round wide eyes, a thick gripping tongue, and of course that amazing knack of seemingly defying gravity with specialized toe pads. But not all geckos are as easily found—or as common—as those hanging out, literally, in a jungle lodge. The Gekko gigante, also known as the Gigante narrow-disked gecko, has been little- noticed by the public. Even scientists know little about the lovely gray-and-blue gecko beyond the fact that it lays its eggs on cool moist cave walls in two Philippine Islands.
History repeats itself: the path to extinction is still paved with greed and waste
(04/05/2010) As a child I read about the near-extinction of the American bison. Once the dominant species on America's Great Plains, I remember books illustrating how train-travelers would set their guns on open windows and shoot down bison by the hundreds as the locomotive sped through what was left of the wild west. The American bison plunged from an estimated 30 million to a few hundred at the opening of the 20th century. When I read about the bison's demise I remember thinking, with the characteristic superiority of a child, how such a thing could never happen today, that society has, in a word, 'progressed'. Grown-up now, the world has made me wiser: last month the international organization CITES (Convention on International Trade in Endangered Species) struck down a ban on the Critically Endangered Atlantic bluefin tuna. The story of the Atlantic bluefin tuna is a long and mostly irrational one—that is if one looks at the Atlantic bluefin from a scientific, ecologic, moral, or common-sense perspective.
Seed dispersal in the face of climate change, an interview with Arndt Hampe
(04/05/2010) Without seed dispersal plants could not survive. Seed dispersal, i.e. birds spreading seeds or wind carrying seeds, means the mechanism by which a seed is moved from its parent tree to a new area; if fortunate the seed will sprout in its new resting place, produce a plant which will eventually seed, and the process will begin anew. But in the face of vast human changes—including deforestation, urbanization, agriculture, and pasture lands, as well as the rising specter of climate change, researchers wonder how plants will survive, let alone thrive, in the future?
When it comes to Yellow Fever, conserving howler monkeys saves lives
(03/29/2010) Abundant and diverse wildlife help people in many ways: for example bees pollinate plants, birds and mammals disperse seeds, bats control pest populations, and both plants and animals have produced life-saving medicines and technological advances. But how could howler monkeys save people from a Yellow Fever outbreak? A new study in the open-access journal Tropical Conservation Science explores the link between howler monkeys, mosquitoes, and humans during a recent yellow fever outbreak in the state of Rio Grande do Sul, Brazil.
Diverse habitats needed for survival of small mammals in Mexico
(03/29/2010) A new study in Tropical Conservation Science shows that small tropical mammals in Mexico—bats and rodents—require a variety of habitats to thrive. Surveying mammal populations in the Isthmus of Tehuantepec, Oaxaca, Mexico, researchers found that sites comprising the greatest habitat diversity carried also the greatest diversity of rodents. In turn bats lived in all variety of habitats and moved easily from one to another.
Last chance to save Bangladeshi forest: 90 percent of the Sal ecosystem is gone
(03/29/2010) Considered the most threatened ecosystem in Bangladesh, the moist deciduous Sal forest (Shorea robusta) is on the verge of vanishing. In 1990 only 10 percent of the forest cover remained, down from 36 percent in 1985 according to statistics from the Food and Agricultural Organization (FAO). A new study in the online open-access journal Tropical Conservation Science looks at the threats posed to the Shal forest and ways in which it may still be saved.
Scientists: new study does not disprove climate change threat to Amazon
(03/19/2010) Recently, Boston University issued a press release on a scientific study regarding the Amazon's resilience to drought. The press release claimed that the study had debunked the Intergovernmental Panel on Climate Change's (IPCC) theory that climate change could turn approximately 40 percent of the Amazon into savanna due to declining rainfall. The story was picked up both by mass media, environmental news sites (including mongabay.com), and climate deniers' blogs. However, nineteen of the world's top Amazonian experts have issued a written response stating that the press release from Boston University was "misleading and inaccurate".
The Asian Animal Crisis
(03/18/2010) The United Nation declared 2010 as the International Year of Biodiversity (IYB). One of the goals of the IYB is to celebrate the achievements of the Convention of Biological Diversity signed by 192 countries since 1992. But what have we accomplished since 1992? Did we put an end to biodiversity loss? The truth is that there is not much to celebrate at all. Asia is a perfect example where the animal crisis and the loss of biodiversity have worsened over decades. The first question that should come to mind is: how many species have vanished in Asia because of human activities? Records of recently extinct species in Asia show 71 species that have disappeared in the wild. Examples include the Yunnan lake newt (Cynops wolterstorffi) from China, the Bonin thrush (Zoothera terrestris) from Japan, or the redtailed black shark (Epalzeorhynchos bicolor) from Thailand.
High Arctic species plummeting across the board, others Arctic residents on the rise
(03/18/2010) Between 1970 and 2004 species populations in the high Arctic have declined by 26 percent, according to the first report by the Arctic Species Trend Index (ASTI). While this may be a natural cycle, scientists are concerned that environmental impacts such as climate change are worsening natural population fluctuations in the high Arctic. Declining species include lemmings, red knot, and caribou. "Rapid changes to the Arctic’s ecosystems will have consequences for the Arctic that will be felt globally. The Arctic is host to abundant and diverse wildlife populations, many of which migrate annually from all regions of the globe. This region acts as a critical component in the Earth’s physical, chemical, and biological regulatory system," lead-author Louise McRae from the Zoological Society of London (ZSL) said in a press release.
Forgotten Species: the marooned pygmy three-toed sloth
(03/16/2010) Many people consider tropical islands mini-paradises: sanctuaries cut-off from the rest of the world. Some species flourish on islands for the same reason. With few predators and a largely consistent environment, once a species has comfortably adapted to its habitat there's little to do but thrive. That is until something changes: like humans showing up. Changes in confined island ecosystems often have large and rapid impacts, too fast and too big for marooned species to survive.
Video: no sunlight, no food, frozen conditions, but NASA finds complex life
(03/16/2010) In a discovery at the bottom of the world that could have implications on the search for extraterrestrial life, researchers were astounded to find an amphipod swimming beneath a massive Antarctic ice sheet.
Amazon confusion: new research shows forest is resilient to drought, but is this the whole picture?
(03/15/2010) A drought that happens once in a hundred years had little negative or positive effect on the Amazon rainforest according to a NASA funded study in Geophysical Research Letters. "We found no big differences in the greenness level of these forests between drought and non-drought years, which suggests that these forests may be more tolerant of droughts than we previously thought," said Arindam Samanta, the study's lead author from Boston University.
Falklands Dispute: Argentine Sovereignty Won’t Solve the Problem
(03/15/2010) With Britain now moving to explore for oil and gas in the Falkland Islands, Argentina has cried foul. Buenos Aires claims that the Falklands, or the Malvinas as Argentines refer to the islands, represent a "colonial enclave" in the south Atlantic. The islands have been a British possession since 1833, and the local inhabitants consider themselves thoroughly British. Yet, Argentina claims the Malvinas as the country inherited them from the Spanish crown in the early 1800s. In 1982 Argentina seized the islands but was later expelled by a British naval force. The war was short but bloody, costing 650 Argentine and 250 British lives.
Secrets of the Amazon: giant anacondas and floating forests, an interview with Paul Rosolie
(03/10/2010) At twenty-two Paul Rosolie has seen more adventure than many of us will in our lifetime. First visiting the Amazon at eighteen, Rosolie has explored strange jungle ecosystems, caught anaconda and black caiman bare-handed, joined indigenous hunting expeditions, led volunteer expeditions, and hand-raised a baby giant anteater. "Rainforests were my childhood obsession," Rosolie told Mongabay.com. "For as long as I can remember, going to the Amazon had been my dream […] In those first ten minutes [of visiting], cowering under the bellowing calls of howler monkeys, I saw trails of leaf cutter ants under impossibly large, vine-tangled trees; a flock of scarlet macaws crossed the sky like a brilliant flying rainbow. I saw a place where nature was in its full; it is the most amazing place on earth."
Flower farms may be killing Kenya's Lake Naivasha
(03/10/2010) Heavily polluted and shrinking, Lake Naivasha is in dire trouble. Environmentalists say the cause is clear: flower farms. Some 60 flower farms line the entire lakeside, growing cut flowers for export largely to the EU. While the flowers industry is Kenya's largest horticultural export (405.5 million last year) it may have also produced an environmental nightmare.
Why seed dispersers matter, an interview with Pierre-Michel Forget, chair of the FSD International Symposium
(03/07/2010) There are few areas of research in tropical biology more exciting and more important than seed dispersal. Seed dispersal—the process by which seeds are spread from parent trees to new sprouting ground—underpins the ecology of forests worldwide. In temperate forests, seeds are often spread by wind and water, though sometimes by animals such as squirrels and birds. But in the tropics the emphasis is far heavier on the latter, as Dr. Pierre-Michel Forget explains to mongabay.com. "[In rainforests] a majority of plants, trees, lianas, epiphytes, and herbs, are dispersed by fruit-eating animals. […] As seed size varies from tiny seeds less than one millimetres to several centimetres in length or diameter, then, a variety of animals is required to disperse such a continuum and variety of seed size, the smaller being transported by ants and dung beetles, the larger swallowed by cassowary, tapir and elephant, for instance."
Photos: Madagascar's wonderful and wild frogs, an interview with Sahonagasy
(03/03/2010) To save Madagascar's embattled and beautiful amphibians, scientists are turning to the web. A new site built by herpetologists, Sahonagasy, is dedicated to gathering and providing information about Madagascar's unique amphibians in a bid to save them from the growing threat of extinction. "The past 20 years have seen resources wasted because of a poor coordination of efforts," explains Miguel Vences, herpetologist and professor at the Technical University of Braunschweig. "Many surveys and reports have been produced that were never published, many tourists found and photographed amphibians but these photos were not made available to mapping projects, many studies carried out by Malagasy students did not make use of literature because it was not available."
Healthy coral reefs produce clouds and precipitation
(03/03/2010) Twenty years of research has led Dr. Graham Jones of Australia's Southern Cross University to discover a startling connection between coral reefs and coastal precipitation. According to Jones, a substance produced by thriving coral reefs seed clouds leading to precipitation in a long-standing natural process that is coming under threat due to climate change.
Prehistoric snake gobbled-up dinosaur babies
(03/02/2010) A fossilized snake has been discovered inside a titanosaur nest in India, leading researchers to conclude that the snake fed on newly-hatched dinosaur babies, rather than their eggs like modern snakes. Paleontologist and snake expert Jason Head says that the snake, known as Sanajeh indicus, lacked the wipe-jaws needed to swallow eggs, but just-hatched baby titanosaurs would have been perfect prey for the 3.5 meter (nearly 12 feet) long serpent. Titanosaurs belong to the sauropods, long-necked herbivorous dinosaurs which includes the world's largest animals to ever walk the land.
Common pesticide changes male frogs into females, likely devastating populations
(03/01/2010) One of the world's most popular pesticides, atrazine, chemically castrates male frogs and in some instances changes them into completely functionally females, according to a new study in the Proceedings of the National Academy of Sciences. The authors conclude that atrazine likely plays a large, but unsuspected role in the current global amphibian crisis.
Guyana bans gold mining in the 'Land of the Giants'
(03/01/2010) Guyana has banned gold dredging in the Rewa Head region of the South American country after pressure from Amerindian communities in the area. A recent expedition to Rewa Head turned up unspoiled wilderness and mind-boggling biodiversity. The researchers, in just six weeks, stumbled on the world's largest snake (anaconda), spider (the aptly named goliath bird-eating spider), armadillo (the giant armadillo), anteater (the giant anteater), and otter (the giant otter), leading them to dub the area 'the Land of the Giants'. "During our brief survey we had encounters with wildlife that tropical biologists can spend years in the field waiting for. On a single day we had two tapirs paddle alongside our boat, we were swooped on by a crested eagle and then later charged by a group of giant otters."
With increased protection, Gulf of California marine life could recover
(02/22/2010) The Gulf of California's once rich marine ecosystem is in trouble. Surveys from 1999 and 2009 revealed that during the ten-year-period 60 percent of the areas showed signs of degradation, including the loss of top predators necessary to keep an ecosystem healthy, for example sharks, groupers, and snappers.
Cricket mothers warn offspring about spiders before they hatch
(02/21/2010) Cricket mothers are long gone by the time their infants hatch, so one would assume that cricket parents have little effect on their offspring's behavior. Not so, according to a new study in the American Naturalist which proves that mother crickets have the potential to teach their offspring—while still in their eggs—about the hazards of spiders.
Where two worlds collide: visiting Tabin Wildlife Reserve
(02/21/2010) The vehicle stopped on the way into Tabin Wildlife Reserve as a troupe of pig-tailed macaques began making their way across the road. In a flash a domestic dog, which may or may not have been 'ownerless', ambushed the group. Chaos erupted as the big predator fell upon the community. As quickly as it began it was all over and the dog was rushing over with an infant monkey in its mouth, leaving the macaques' screeching out their helplessness. As my uncustomary welcome to Tabin Wildlife Reserve shows: the park is a meeting of two worlds. On the left side of the road leading into the reserve is a massive oil palm plantation, on the right is the rainforest and the many species the reserve protects. Tabin, therefore, gives the visitor a unique up-close view of the debate raging in Borneo and throughout much of Southeast Asia over conservation and environment versus oil palm plantations.
New study: why plants produce different sized seeds
(02/17/2010) The longstanding belief as to why some plants produce big seeds and others small seeds is that in this case bigger-is-better, since large seeds have a better chance of survival. However, Helene Muller-Landau, staff scientist at the Smithsonian Tropical Research Institute and head of the HSBC Climate Partnership's effort to quantify carbon in tropical forests, grew dissatisfied with that explanation. For example, if big seeds were always the 'right' evolutionary path than why would any plants evolve small seeds? In a new paper in the Proceedings of the National Academy of Sciences, Muller-Landau argues for a more complex explanation involving a trade-off between surviving stressful conditions and taking full advantage when the conditions are just right.
Rainforest expert agrees with IPCC: warns of 'tipping point' for Amazon
(02/03/2010) Amid questions over the Amazon forests' capacity to survive climate change, a renowned tropical biologist says that in fact the fears are real, reports Tierramerica. Speaking at the Biodiversity Science Policy Conference in Paris, Thomas Lovejoy, biodiversity chair at the Washington DC-based Heinz Center for Science, Economics and the Environment, and chief biodiversity adviser to the president of the World Bank, described the Amazon rainforest as "very close to a tipping point".
Jumbo squid explosion
(02/02/2010) Jumbo squid are back in the waters of Southern California and anglers are seeing an uptick in business, reports the Los Angeles Times.
Why top predators matter: an in-depth look at new research
(02/02/2010) Few species have faced such vitriolic hatred from humans as the world's top predators. Considered by many as pests—often as dangerous—they have been gunned down, poisoned, speared, 'finned', and decimated across their habitats. Even where large areas of habitat are protected, the one thing that is often missing are top predators. However, new research over the past few decades is showing just how vital these predators are to ecosystems. Biologists have long known that predators control populations of prey animals, but new studies show that they may do much more. From controlling smaller predators to protecting river banks from erosion to providing nutrient hotspots, it appears that top predators are indispensible to a working ecosystem. Top predators sit at the apex of an ecosystem's food chain. Wolves in Alaska, tigers in Siberia, lions in Kenya, white sharks in the Pacific are all examples of top predators.
The secret life of a Californian pest
(02/01/2010) The acorn woodpecker is best known for its chortle, which may have inspired Woody the Woodpecker's iconic laugh. But many California residents say there's nothing funny about the hundreds of holes these birds leave outside of homes and businesses while storing acorns for the winter. In early 2009, two housing associations in the retirement community of Rossmoor found themselves at the heart of a national scandal after obtaining a depredation permit to shoot the winged vandals, according to the Los Angeles Times. But researchers on the Hastings Natural History Reserve in Carmel Valley don't see acorn woodpeckers as pests. For more than 40 years, biologists here have studied the ecological soap operas underlying acorn woodpecker social groups to learn why animals choose to cooperate in some situations and not in others.
Photos: New tropical frog undergoes remarkable transformation
(02/01/2010) Nature never runs out of surprises. Exploring Sudest Island off of Papua New Guinea, researchers discovered a new species of frog that drastically changes its appearance from juvenile to adulthood, a transformation that has never been seen in another frog.The new species, named Oreophryne ezra, is shiny black with bright yellow spots. Yet when it matures, the frog becomes rose-colored and even its eyes change from black to blue.
Loss in biodiversity may be killing bees
(01/20/2010) A decline in diverse plants species on which to feed may be causing a similar decline in bee survival, according to a new paper in Biology Letters.
Photos: park in Ecuador likely contains world’s highest biodiversity, but threatened by oil
(01/19/2010) In the midst of a seesaw political battle to save Yasuni National Park from oil developers, scientists have announced that this park in Ecuador houses more species than anywhere else in South America—and maybe the world. "Yasuní is at the center of a small zone where South America's amphibians, birds, mammals, and vascular plants all reach maximum diversity," Dr. Clinton Jenkins of the University of Maryland said in a press release. "We dubbed this area the 'quadruple richness center.'"
The Caribbean's wonderfully weird (and threatened) mammals, an interview with Jose Nunez-Mino
(01/18/2010) Not many people know the solenodon and the hutia, yet for the fortunate few that have encountered them, these strange little-studied mammals—just barely holding on in the Caribbean island of Hispaniola—deserve to be stars of the animal kingdom. "I could not quite believe it the first time I held a solenodon; I was in utter awe of this mesmerizing mammal. […] They have a long flexible snout which is all down to the fact that it is joined to the skull by a unique ball-and-socket joint. This makes it look as if the snout is almost independent to the rest of the animal. You can’t help but feel fascinated by the snout and inevitably it does make you smile," Dr. Jose Nunez-Mino, the Project Manager for a new initiative to study and conserve the island's last mammals, told mongabay.com in an interview.
Forgotten species: discovering the shimmer of Maathai's Longleg
(01/13/2010) Few species receive less respect and less conservation attention than insects. This despite the fact that they are some of the most diverse species on the planet andthey provide a number of essential services to humankind, including pollination, pest control, production (for example honey and silk), waster recycling, and indications of habitat health. Scientists are not only unsure just how many species of insects are threatened in world; they are equally uncertain how many insects exist. Currently there are nearly a million insect species described by science, but millions more likely exist. It's probable that innumerable insect species have vanished before even being catalogued by entomologists.
World of Avatar: in real life
(01/13/2010) A number of media outlets are reporting a new type of depression: you could call it the Avatar blues. Some people seeing the new blockbuster film report becoming depressed afterwards because the world of Avatar, sporting six-legged creatures, flying lizards, and glowing organisms, is not real. Yet, to director James Cameron's credit, the alien world of Pandora is based on our own biological paradise—Earth. The wonders of Avatar are all around us, you just have to know where to look.
If protected coral reefs can recover from global warming damage
(01/10/2010) A study in the Caribbean has found that coral reefs can recover from global warming impacts, such as coral bleaching, if protected from fishing. Marine biologists have long been worried that coral reefs affected by climate change may be beyond recovery, however the new study published in PLoS ONE shows that alleviating another threat, overfishing, may allow coral reefs to cope with climate change.
Bottom-dwelling sea animals play surprising role in carbon sequestration
(01/07/2010) Researchers have long known that some marine animals, such as plankton, play big roles in the carbon cycle, but a new study shows that a long-ignored family of marine animals, the bottom-dwelling echinoderms, also do their part in the carbon cycle.
Starving hyenas kill and eat 12-foot-long python during drought
(01/05/2010) Members with the conservation group Lion Guardians stumbled on a rare site in the Amboseli area of Kenya recently: six hyenas and a number of jackals were attacking and eating a 12-foot-long python. On their blog at WildlifeDirect, Lion Guardians describe the attack: "[the hyenas and jackals] tore into its body from the back, and were taking their share while the upper part of the python was still alive! The Lion Guardian team was shocked and surprised at the same time, having never seen anything like it before."
A 'dangerous world' for migratory birds, an interview with Sarah Lehnen
(01/04/2010) Sarah Lehnen has worked with America's rich birdlife for a decade: she has studied everything from songbirds inhabiting dwindling shrub land in Ohio to shorebirds stopping over in the Mississippi Rive alluvial valley, always with an eye towards conservation. Most recently she has been involved in testing migratory birds for avian flu. It may come as a surprise, but American birds are in serious decline. In March of last year, US Secretary of the Interior, Ken Salazar, announced that one-in-three American birds are endangered. Even once common birds are showing precipitous declines. Birds face a barrage of threats, which are only complicated—and heightened—for migratory birds.
Bridge development in Kalimantan threatens rainforest, mangroves, and coral reef
(01/03/2010) Balikpapan Bay in East Kalimantan is home to an incredible variety of ecosystems: in the shallow bay waters endangered dugong feed on sea grasses and salt water crocodiles sleep; along the bay proboscis monkeys leap among mangroves thirty meters tall and Irrawaddy dolphins roam; beyond the mangroves lies the Sungai Wain Protection forest; here, the Sunda clouded leopard hunts, sun bears climb into the canopy searching for fruits and nuts, and a reintroduced population of orangutans makes their nests; but this wilderness, along with all of its myriad inhabitants, is threatened by a plan to build a bridge and road connecting the towns of Penajam and Balikpapan.
Uninhabited tropical island paradise seeks REDD funding to save it from loggers
(12/17/2009) Tetepare may be one of the last tropical island paradises left on earth. Headhunting and a mysterious illness drove its original inhabitants from the island two hundred years ago, making Tetepare today the largest uninhabited island in the tropical Pacific. The 120 square kilometer island (46 square miles), long untouched by industry or agriculture, is currently threatened by logging interests. However, the island is not without champions: in 2002 descendents of the original inhabitants of Tetepare formed the Tetepare Descendents Association (TDA) to preserve the island. Recently they have teamed up with the Solomon Islands Government and the Solomon Islands Community Conservation Partnership to develop financing through REDD.
Photos: ten beloved species threatened by global warming
(12/14/2009) The International Union for the Conservation of Nature (IUCN) has released a list of ten species that are likely to be among the hardest hit by climate change, including beloved species such as the leatherback sea turtle, the koala, the emperor penguin, the clownfish, and the beluga whale. The timing of the list coincides with the negotiations by world leaders at the UN Climate Change Conference to come up with an international agreement to combat climate change.
Eco-label for rainforest products could boost sustainability
(12/06/2009) Tropical forests around the world continue to fall, largely the result of logging and conversion to agriculture. But new hope for forests has emerged under a scheme that would reward countries for reducing greenhouse gas emissions from deforestation and degradation. Some variations of the concept, which is known as REDD, would allow for "sustainable forest management" (SFM), that is, reduced impact logging of forests, as well as harvesting of non-wood forest products (NWFPs) like seeds, fruit, and game. But the extent to which this harvesting affects forest ecology, and therefore carbon sequestration, is still poorly understood.
How tree communities respond to distance to edges and canopy openness
(12/06/2009) Tropical forests frequently experience the opening and closing of canopy gaps as part of their natural dynamics. When an edge is created, and the area outside the boundary is a disturbed or unnatural system, forests can be seriously affected even at some distance from the fragmented edge, since sunlight and wind penetrate to a much greater extent. This increases tree mortality and, consequently, canopy openness close to the edge. Thus, canopy openness can be both part of a natural gap-dynamics cycle and the direct manifestation of human edge effects.
Forests recover faster from slash-and-burn when near intact forest reserves
(12/06/2009) Areas cleared for slash-and-burn agriculture recover faster when adjacent to a large block of untouched forest, but may take decades to regain a majority of their biodiversity after tree-felling, according to a new review of ecological studies, published in the December issue of Tropical Conservation Science, an open access journal.
What types of primates are most prone to extinction in small forest fragments?
(12/06/2009) According to the most recent IUCN assessment, 48 percent of primates are threatened with extinction. Major threats to primates include habitat loss and fragmentation, hunting, and the wildlife trade. A new paper published in Tropical Conservation Science looked at ones of these threats — fragmentation — in an effort to determine what traits put primates at highest risk of extinction in forest fragments. Traits investigated all related to various aspects of primate biology, including: the amount of habitat needed, reproductive rate, and types of specialization. Surprisingly the authors, Matthew A. Gibbons and Alexander H. Harcourt of the University of California at Davis, found no significant relationship between extinction risk and any of the biological parameters.
Not just the polar bear: ten American species that are feeling the heat from global warming
(12/01/2009) A new report, America’s Hottest Species, highlights a variety of American wildlife that are currently threatened by climate change from a small bird to a coral reef to the world’s largest marine turtle.
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