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News articles on Invasive Species
Mongabay.com news articles on Invasive Species in blog format. Updated regularly.
(04/15/2014) Since the arrival of Homo sapiens, other species have been going extinct at an unprecedented rate. Most scientists now agree that extinction rates are between 100 and 1000 times greater than before humans existed. Working out what is driving these extinctions is fiendishly complicated, but a new study suggests that human life expectancy may be partly to blame.
Alien trees use logging roads to invade Borneo forests
(03/25/2014) The spiked pepper tree (Piper aduncum) is native to the American tropics, but has made itself at home in a variety of other locales where it can crowd out local vegetation and interfere with forest recovery. Although it’s been slow to spread through Borneo since its introduction to Indonesia in 1952, new logging roads appear to be driving the species farther afield. A study in mongabay.com’s open access journal Tropical Conservation Science raises concerns that these roads may bring unintended plant colonists to new areas – putting the biodiversity of forests at risk.
Nicaragua Canal could cause ecological disaster, warn experts
(02/20/2014) Nicaragua's plans for a canal linking the Pacific and Atlantic Oceans could trigger an environmental disaster through habitat destruction and alteration, introduction of non-native species, pollution, and sedimentation, warns a commentary published in this week's issue of Nature.
Meeting the mammal that survived the dinosaurs
(10/14/2013) So, here I am, running in a forest at night over 2,000 miles from home. This forest—dry, stout, and thorny enough to draw blood—lies just a few miles north of a rural town in the western edge of the Dominican Republic on the border with Haiti. I'm following—or trying to keep pace with—a local hunter and guide as we search for one of the world's most bizarre mammals. It's an animal few people have heard of, let alone actually seen; even most Dominicans don't readily recognize its name or picture. But I've been obsessed with it for six years: it's called a "solenodon," more accurately the Hispaniolan solenodon or its (quite appropriate) scientific name, Solenodon paradoxus.
Pet fish invade ecosystem, upending nutrients and impoverishing fishers
(10/02/2013) If you, or someone you know, owns a freshwater aquarium, chances are you have seen the peculiar little creature attached face-first to the glass in effort to find a morsel of algae. This algae eater, popularly known as the sucker fish, is the sailfin catfish, or plecos. It is one of the most commonly purchased fish in the freshwater aquarium fish trade, and, according to recent research in The Royal Society B, aquarists often reintroduce the sucker-fish into the wild with detrimental consequences.
'Ecological Armageddon': mammals vanish entirely from forest fragments after 25 years
(09/26/2013) As tropical forests worldwide are increasingly cut into smaller and smaller fragments, mammal extinctions may not be far behind, according to a new study in Science. Tracking native smalls mammals in Chiew Larn Reservoir, Thailand for over 25 years, scientists found a stunning and rapid decline in mammal populations, until most forests were almost completely emptied of native mammals.
Are 'novel' tropical forests nature’s response to global change?
(08/22/2013) We now live in a world dominated by humans (the Anthropocene), whose activities on Earth are resulting in new habitats and new environmental conditions including climate change. To many, the Anthropocene is an era of environmental doom that unless reversed, will result in catastrophic reductions in biodiversity. An alternate view is that the biota will adjust to the new environmental conditions and through processes of species mixing and self-organization will form sustainable novel communities of organisms.
Journey to the Edge of Eden: the struggle to preserve Southwest Florida
(08/05/2013) Gary Schmelz, in a Journey to the Edge of Eden, takes us through a wonderful personal account of the conservation history of Southwest Florida. Journey to the Edge of Eden is one part personal memoir similar to the English naturalist Gerald Durrell and one part Florida conservation history. With hilarious stories of unintended naturalist misadventures and recounting conservation “as it happened,” a Journey to the Edge of Eden is one of those rare books you read in a coffee shop and with gusto and pride while laughing along out loud at Gary Schmelz stories.
Conservationists work to give South Georgia back to the birds
(07/18/2013) A team on South Georgia has successfully completed the world's largest rodent eradication in an effort to rid the British territory of millions of rats and mice. Against the backdrop of an approaching Antarctic winter between February and May, three helicopters encountered perilous flying conditions while peppering the southern Atlantic island with 183 tonnes of the poison Brodifacoum. The team of 25 baited an area of 224 sq miles (580 sq km). The area targeted dwarfed the previous largest rodent eradication, on New Zealand's Campbell Island, by five times.
Unconventional swine: how invasive pigs are helping preserve biodiversity in the Pantanal
(05/06/2013) Ordinarily, invasive and exotic species are a grave threat to native wildlife: outcompeting local species, introducing parasites and disease, and disturbing local ecological regimes. A unique case in the Brazilian Pantanal, however, has turned the tables; here, an introduced mammal has actually aided the conservation of native wildlife.
Saviors or villains: controversy erupts as New Zealand plans to drop poison over Critically Endangered frog habitat
(04/10/2013) New Zealand's Department of Conservation (DOC) is facing a backlash over plans to aerially drop a controversial poison, known as 1080, over the habitat of two endangered, prehistoric, and truly bizarre frog species, Archey's and Hochsetter's frogs, on Mount Moehau. Used in New Zealand to kill populations of invasive mammals, such as rats and the Australian long-tailed possum, 1080 has become an increasingly emotive issue in New Zealand, not just splitting the government and environmentalists, but environmental groups among themselves. Critics allege that the poison, for which there is no antidote, decimates local animals as well as invasives, while proponents say the drops are the best way to control invasive mammals that kill endangered species like birds and frogs and may spread bovine tuberculosis (TB).
Ant communities more segregated in palm oil plantations than rainforest
(03/21/2013) Ants are an important ecological group in both degraded and natural habitats. They interact with many other species and mediate a range of ecological processes. These interactions are often interpreted in the context of ant mosaics, where dominant species form strict territories, keeping other ants out. This segregation between ant species is well-documented in monoculture plantations. Now new research published in Ecography has shown that these changes are driven by the replacement of rainforests with monocultures and not the arrival of non-native species.
Invasive plants hurt locals in Mauritius
(03/18/2013) Native species on the island of Mauritius have long had to deal with invasive species. In fact, invasives likely played a major role in the extinction of the Mauritius' most famous resident, the dodo. While scientists have long cataloged the impact of invasive animals on island wildlife, there has been less clarity when it comes to invasive plants. However, a new paper in mongabay.com's open access journal Tropical Conservation has found that invasive plants do indeed negatively impact local species.
The Role of Science for Conservation - book review
(03/18/2013) The Role of Science for Conservation, edited by Matthias Wolff and Mark Gardner, celebrates Charles Darwin’s Bicentennial and 50 years of research by the Charles Darwin Foundation in The Galápagos, Ecuador.
Captive frogs may be spreading diseases to wild cousins across Southeast Asia
(03/07/2013) Scientists have documented a series of links between exotic frogs for trade and diseases in wild frogs in Southeast Asia, including the first documented case of the chytrid fungus—a virulent and lethal disease—in Singapore. According to researchers writing in a new study in EcoHealth, frogs imported into Southeast Asia as pets, food, or traditional medicine are very likely spreading diseases to wild populations.
Warnings of global ecological tipping points may be overstated
(03/05/2013) There's little evidence that the Earth is nearing a global ecological tipping point, according to a new Trends in Ecology and Evolution paper that is bound to be controversial. The authors argue that despite numerous warnings that the Earth is headed toward an ecological tipping point due to environmental stressors, such as habitat loss or climate change, it's unlikely this will occur anytime soon—at least not on land. The paper comes with a number of caveats, including that a global tipping point could occur in marine ecosystems due to ocean acidification from burning fossil fuels. In addition, regional tipping points, such as the Arctic ice melt or the Amazon rainforest drying out, are still of great concern.
Extinction warning: racing to save the little dodo from its cousin's fate
(03/04/2013) Sometime in the late 1600s the world's last dodo perished on the island of Mauritius. No one knows how it spent its final moments—rather in the grip of some invasive predator or simply fading away from loneliness—but with its passing came an icon of extinction, that final breath passed by the last of its kind. The dodo, a giant flightless pigeon, was a marvel of the animal world: now another island ground pigeon, known as the little dodo, is facing its namesake's fate. Found only in Samoa, composed of ten islands, the bird has many names: the tooth-billed pigeon, the Manumea (local name), and Didunculus ("little dodo") strigirostris, which lead one scientist to Christen it the Dodlet. But according to recent surveys without rapid action the Dodlet may soon be as extinct as the dodo.
Scientist: releasing invasive birds in Turkey to eat ticks will backfire
(02/04/2013) As Turkey raises and releases thousands of non-native helmeted guineafowl (Numida meleagris) to eat ticks that carry the deadly Crimean-Congo hemorrhagic fever virus, new research suggests guineafowl actually eat few ticks, carry the parasites on their feathers, and further spread the disease.
Killer kittens: U.S. cats kill up to 25 billion birds and small mammals per year
(01/30/2013) Domesticated cats in the United States kill far more animals than previously thought — 1.4 to 3.7 billion birds and 6.9 – 20.7 billion small mammals per year — finds a study published this week in the journal Nature Communications.
Cute koalas have become 'urban refugees'
(01/28/2013) According to Susan Kelly, koalas have become "urban refugees," under siege by expanding cities that bring with them deforestation, dogs, traffic, and other ills for native wildlife. Director of Global Witness, and writer, producer and director of the new documentary Koala Hospital, Kelly has spent 3 years working to understand the rising threats to one of the world's most beloved marsupials. While Koala Hospital highlights the many perils facing koalas, including climate change due to record fires across Australia, it also looks at the efforts of individuals who work to save koalas one—by—one at Port Macquarie Koala Hospital, taking in patients who have been orphaned, hit by cars, scarred in fires, or attacked by dogs.
Meet Cape Town's volunteer 'toad shepherds'
(11/08/2012) August marks the last month of winter in South Africa, and, as temperatures begin to rise, activists in Cape Town prepare for a truly unique conservation event. Every year at this time western leopard toads (Amietophrynus pantherinus) endemic to the region and Critically Endangered, embark on a night-time migration through Cape Town from their homes in the city's gardens to the ponds they use as breeding sites—as far as three kilometers away. This season over one hundred volunteers took to the streets, flashlights in hand, to assist the toads in navigating the increasing number of man-made obstacles in their path. Among them was life-long resident and mother, Hanniki Pieterse, who serves as an organizer for volunteers in her area.
Remarkable comeback: blue iguana downgraded to Endangered after determined conservation efforts
(10/23/2012) The wild blue iguana population has increased by at least 15 times in the last ten years, prompting the IUCN Red List to move the species from Critically Endangered to just Endangered. A targeted, ambitious conservation program, headed by the Blue Iguana Recovery Team, is behind this rare success for a species that in 2002 only numbered between 10 and 25 individuals.
Arachnopocalypse: with birds away, the spiders play in Guam
(09/17/2012) The island of Guam is drowning in spiders. New research in the open-access journal PLOS ONE has found that in the wet season, Guam's arachnid population booms to around 40 times higher than adjacent islands. Scientists say this is because Guam, a U.S. territory in the Pacific, has lost its insect-eating forest birds. Guam's forests were once rich in birdlife until the invasion of non-native brown tree snake (Boiga irregularis) in the 1940s decimated biodiverse bird communities. Now, the island is not only overrun with snakes, but spiders too.
Animal pictures of the day: booming captive breeding for Mauritius skinks
(08/14/2012) Three female orange-tailed skinks skinks have produced 16 skink babies in just four months, according to the Durrell Wildlife Conservation Trust (DWCT), which is captive breeding the Critically Endangered species. The breeding efforts are all the more remarkable since the females only produce two eggs at a time.
Massive snake found in Florida (photos)
(08/14/2012) Researchers in Florida have documented the biggest snake ever found in Florida. But the snake is an invader — it's not native.
Meet the world's rarest snake: only 18 left
(07/10/2012) It's slithery, brown, and doesn't mind being picked up: meet the Saint Lucia racer (Liophis ornatus), which holds the dubious honor of being the world's most endangered snake. A five month extensive survey found just 18 animals on a small islet off of the Caribbean Island of Saint Lucia. The snake had once been abundant on Saint Lucia, as well, but was decimated by invasive mongooses. For nearly 40 years the snake was thought to be extinct until in 1973 a single snake was found on the Maria Major Island, a 12-hectare (30 acre) protected islet, a mile off the coast of Saint Lucia (see map below).
Lonesome George passes, taking unique subspecies with him
(06/25/2012) Lonesome George, the sole surviving member of the Pinta Island tortoise (Chelonoidis nigra abingdoni), was found dead on Sunday by staff at the Galapagos National Park. With George's passing, the Pinta Island tortoise subspecies officially falls into extinction. First found in 1972, Lonesome George became famous for representing the last of his kind. He was believed to be around 100—middle-aged for a Galapagos tortoise which can live to 200 years old. Staff plan to do an autopsy to determine the cause of death.
Why bird droppings matter to manta rays: discovering unknown ecological connections
(06/04/2012) Ecologists have long argued that everything in the nature is connected, but teasing out these intricate connections is not so easy. In fact, it took research on a remote, unoccupied island for scientists to discover that manta ray abundance was linked to seabirds and thereby native trees.
Island bat goes extinct after Australian officials hesitate
(05/23/2012) Nights on Christmas Island in the Indian Ocean will never again be the same. The last echolocation call of a tiny bat native to the island, the Christmas Island pipistrelle (Pipistrellus murrayi), was recorded on August 26th 2009, and since then there has been only silence. Perhaps even more alarming is that nothing was done to save the species. According to a new paper in Conservation Letters the bat was lost to extinction while Australian government officials equivocated and delayed action even though they were warned repeatedly that the situation was dire. The Christmas Island pipistrelle is the first mammal to be confirmed extinct in Australia in 50 years.
Skink biodiversity jumps 650 percent in the Caribbean
(04/30/2012) In a single paper in Zootaxa scientists have rewritten the current understanding of lizard biodiversity in the Caribbean. By going over museum specimens of skinks, scientists have discovered 24 new species and re-established nine species previously described species, long-thought invalid. The single paper has increased the number of skinks in the Caribbean by 650 percent, from six recognized species to 39. Unfortunately, half of these new species may already be extinct and all of them are likely imperiled.
Invasive primates threaten Atlantic Forest natives
(03/19/2012) Scientists have called for the removal of eight invasive primates from Brazil's imperiled Atlantic Forest in a new study published in mongabay.com's open access journal Tropical Conservation Society. The researchers fear that the eight alien monkeys could hurt other species due to increased competition, predation, and possible disease.
Invasion!: Burmese pythons decimate mammals in the Everglades
(01/30/2012) The Everglades in southern Florida has faced myriad environmental impacts from draining for sprawl to the construction of canals, but even as the U.S. government moves slowly on an ambitious plan to restore the massive wetlands a new threat is growing: big snakes from Southeast Asia. A new paper in the Proceedings of the National Academy of Sciences (PNAS) has found evidence of a massive collapse in the native mammal population following the invasion of Burmese pythons (Python molurus bivittatus) in the ecosystem. The research comes just after the U.S. federal government has announced an importation ban on the Burmese python and three other big snakes in an effort to safeguard wildlife in the Everglades. However, the PNAS study finds that a lot of damage has already been done.
California city bans bullfrogs to safeguard native species
(01/26/2012) Santa Cruz, California has become the first city in the U.S. to ban the importation, sale, release, and possession of the American bullfrog (Rana catesbeiana). Found throughout Eastern and Central U.S., the frogs have become an invasive threat to wildlife in the western U.S. states and Canada.
U.S. implements snake ban to save native ecosystems
(01/25/2012) Last week the U.S. Fish and Wildlife Service (USFWS) announced it was banning the importation and sale across state lines of four large, non-native snakes: the Burmese python (Python molurus bivittatus), the yellow anaconda (Eunectes notaeus), and two subspecies of the African python (Python sebae). Although popular pets, snakes released and escaped into the wild have caused considerable environmental damage especially in the Florida Everglades.
Aloha, and welcome to the planet's extinction capital
(11/07/2011) Hawaii evokes images of a tropical paradise where fragrant flowers, vivid colors, exotic plants, birds, and fish abound. Unfortunately, much of Hawaii's original native flora and fauna has disappeared since the arrival of Europeans in the 18th Century. Hawaii now has the dubious distinction as having become the planet’s extinction capital, having lost more than 55 endemic species (mostly native forest birds) which account for nearly one third of recorded of bird extinctions since the 1700s.
Forgotten species: the rebellious spotted handfish
(07/12/2011) Evolution is a bizarre mistress. In her adaptation workshop she has crafted parrots that don't fly, amphibians with lifelong gills, poison-injecting rodents, and tusked whales. In an evolutionary hodge-podge that is reminiscent of such mythical beasts as chimeras and griffins, she has from time-to-time given some species' attributes of others, such as the marine iguana who is as happy underwater as a seal, the duck-billed platypus that lays eggs like a reptile, and the purple frog that has a lifestyle reminiscent of a mole. Then there's one of her least-known hodge-podges: the fish who 'walks' with hands instead of swimming.
Ant surprises on Murciélago Islands in Costa Rica
(06/28/2011) The Murciélago Islands are seven small islands off the northwest coast of Costa Rica in the Area de Conservación Guanacaste (ACG), home to one of the largest intact dry tropical forests in Central America. Despite this, few scientists have studied the biodiversity of these small uninhabited islands. A new study in the open access journal Tropical Conservation Science has attempted to rectify this gap by conducting the first survey of insects, specifically ants, on the islands. Researchers were surprised at the richness of ant species on the island: 50 species were documented, only two of which were invasive species.
Down to 50, conservationists fight to save Javan Rhino from extinction
(05/17/2011) Earlier this year, the International Rhino Foundation launched Operation Javan Rhino to prevent the extinction of the critically endangered Javan Rhinoceros (Rhinoceros sondaicus), formerly found in rain forests across Southeast Asia. Operation Javan Rhino is a multi-layered project which links field conservation, habitat restoration, and management efforts with the interests of local governments and communities. The following is an interview with Susie Ellis, Executive Director of the International Rhino Foundation.
New land snail invading Singapore requires swift action
(03/28/2011) An African land snail Limicolaria flammea has been discovered by researchers in six locations in Singapore, perhaps heralding a new invasion of alien land snails in Southeast Asia. Although snails may seem largely innocuous creatures, past invasions have resulted in agricultural and economic damage. The global invasion of the giant African land snail (Achatina fulica) has been called one of the world's top 100 worst alien species. Writing in mongabay.com's open access journal Tropical Conservation Science, researchers examine the issue and provide suggestions as to how Singapore authorities can quickly rid the nation of Limicolaria flammea.
Alien plants invade Nigerian protected 'gene bank'
(03/28/2011) Very few studies have been conducted on invasive species in Nigeria, however a new study in mongabay.com's open access journal Tropical Conservation Science has discovered 25 invasive plants in a field gene bank at the National Center for Genetic Resources and Biotechnology (NASGRAB) in Ibadan. The gene bank is used to establish populations of important and, in some cases threatened, native plant species. The gene bank spans 12 hectares, but the study found that 18% of the area was overtaken with invasive species that likely compete with the protected Nigerian plants for nutrients, space, and light. Among the 25 invasive species, 14 were herbs, 8 were vines, 2 were shrubs, and one was a tree.
Photos: penguins devastated by oil spill
(03/22/2011) Disturbing photos show northern rockhopper penguins (Eudyptes moseleyi) hit hard by an oil spill from a wrecked cargo ship on Nightingale Island in the Southern Atlantic. Already listed as Endangered by the IUCN Red List, the oil spill threatens nearly half of the northern rockhopper population according to BirdLife International. Already conservation workers say 'hundreds' of penguins have been oiled. Located the remote Southern Atlantic, Nightingale Island is a part of the UK's Tristan da Cunha archipelago. The island's are home to a variety of birdlife, including species that survive no-where else but on the archipelago.
Hundreds of endangered penguins covered in oil after remote spill
(03/21/2011) Conservation workers have found hundreds of oiled northern rockhopper penguins (Eudyptes moseleyi) after a cargo vessel wrecked on Nightingale Island, apart of the UK's Tristan da Cunha archipelago. Northern rockhopper penguins are listed as Endangered by the IUCN Red List. According to a press release by BirdLife International, the spill threatens nearly half of the world's northern rockhopper population.
New Caledonia's forests are second most threatened in the world, not New Zealand's
(02/06/2011) On February 2nd, Conservation International (CI) released a list of the world's top 10 most threatened forest hotspots. The original press release incorrectly named New Zealand as number two, when in fact it is the island of New Caledonia and the surrounding East Melanesian islands.
Forgotten species: the plummeting cycad
(12/06/2010) I have a declarative statement to make: cycads are mind-blowing. You may ask, what is a cycad? And your questions wouldn't be a silly one. I doubt Animal Planet will ever replace its Shark Week with Cycad Week (perhaps the fact that it's 'animal' planet and not 'plant' planet gave that away); nor do I expect school children to run to see a cycad first thing when they arrive at the zoo, rushing past the polar bear and the chimpanzee; nor do I await a new children's book about a lonely little anthropomorphized cycad just looking for a friend. In the world of species-popularity, the cycad ranks pretty low. For one thing, it's a plant. For another thing, it doesn't produce lovely flowers. And for a final fact, it looks so much like a palm tree that most people probably wouldn't know it wasn't. Still, I declare the cycad to be mind-blowing.
World's rarest snake making a comeback
(11/02/2010) The Antiguan racer (Alsophis antiguae) shares a similar story with many highly endangered island species. Invasive mongoose killed every racer on the Caribbean island of Antigua, leaving only a small population on nearby Great Bird Island. Confined to 8 hectares, this final population was being killed-off by invasive Eurasian black rats. By the time conservationists took action, only 50 Antiguan racers survived in the world. But here's where the story turns out different: 15 years later, a partnership between six conservation groups has succeeded in raising the population tenfold to 500 snakes and expanded its territory to other islands through snake-reintroductions.
Rivers worldwide in peril: society treats symptoms, ignores causes
(09/29/2010) Dams, agricultural runoff, pesticides, sewage, mercury pollution from coal plants, invasive species, overconsumption, irrigation, erosion from deforestation, wetland destruction, overfishing, aquaculture: it's clear that the world's rivers are facing a barrage of unprecedented impacts from humans, but just how bad is the situation? A new global analysis of the world's rivers is not comforting: the comprehensive report, published in Nature, finds that our waterways are in a deep crisis which bridges the gap between developing nations and the wealthy west. According to the study, while societies spend billions treating the symptoms of widespread river degradation, they are still failing to address the causes, imperiling both human populations and freshwater biodiversity.
U.S. government bombs Guam with frozen mice to kill snakes
(09/28/2010) In a spectacularly creative effort to rid the island of Guam of an invasive species, the US Department of Agriculture is planning to 'bomb' the rainforests with dead frozen mice laced with acetaminophen. The mice-bombs are meant to target the brown tree snake, an invasive species which has ravaged local wildlife, and angered local residents, since arriving in the 1940s.
Goats, cats trigger near extinction of Hawaiian bird in past 7 years
(09/14/2010) A new survey by the United States Geological Survey shows the population of the Palila (Loxioides bailleui), a beautiful songbird found only in Hawaii, has fallen from 4,400 birds to 1,200 birds since 2003, a decline of nearly 75 percent. The bird is being driven toward extinction by introduced sheep and goats, which are destroying the Palila's key food source, and feral cats, which are killing off adult birds and hatchlings, according to the American Bird Conservancy.
Australian mammals in steady decline even in large National Park
(07/19/2010) Kakadu National Park, one of the Australia's "largest and best-resourced" protected areas, is experiencing a staggering decline in its small mammal population, according to a new study published in Wildlife Research. Spanning nearly 2 million hectares—larger than Fiji—the park lies in tropical northern Australia. 'This decline is catastrophic,' John Woinarski, lead author of the study and expert on Australian mammals, told mongabay.com. 'We know of no comparable case in the world of such rapid and severe decline of a large proportion of native species in a large conservation reserve.'
Photos: rats drive island lizard to extinction
(06/29/2010) The Selmunett lizard (Podarcis filfolensis ssp. Kieselbachi) is very likely extinct, according to Maltese naturalist Arnold Sciberras. One of four subspecies of the Maltese wall lizard, the Selmunett lizard was last seen in 2005. Although the lizard's home—Selmunett Island—has long been uninhabited by people, that fact did not help save the lizard. Over-predation by introduced rats is thought to be the primary cause of lizard's extinction.
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