Wreathed Hornbill (Rhyticeros undulatus). Hornbills are important seed dispersers in many forests yet they are often targeted by hunters. Click image for more photos of hornbills. (Photo by R. Butler)
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HUNTING/POACHING
By Rhett Butler | Last updated July 27, 2012
Humans have long hunted wild game from forests, but over the past 50 years commercialization of killing has triggered a rapid increase in wildlife depletion. Hunting and poaching cause damage to the rainforest ecosystem by removing species key to the system's functioning. The loss of a certain single species can mean extinction for many others.
Hunting of seed dispersers and pollinators can influence the structure of a forest. According to research from Central Africa, heavy bushmeat hunting alters forest composition by favoring small-seeded trees over large-seeded, leading to lower tree diversity of trees that have big seeds.
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Average wildlife harvesting rates of large mammals (>1 kilogram adult body mass) in tropical forests are about 6.0 animals per square kilometer per year in
Southeast Asia (2 studies), 17.5 animals in Africa (2 studies), and 8.1 animals in Latin America (5 studies) according to data derived from J. Robinson and E. Bennett, Eds., Hunting for Sustainability in Tropical Forests (Columbia University Press, New York, 1999). Chart and photo of a young gorilla in Gabon by Rhett A. Butler.
These rough estimates, showing that millions of animals are killed each year in Africa, Asia, and the Amazon for subsistence hunting and the bushmeat trade, are extrapolated from J. Robinson and E. Bennett (1999) data, forest cover figures from the U.N. Food and Agricultural Organization for 2005, and numbers in J. Robinson and K. Redford, Eds., Neotropical Wildlife Use and Conservation (University of Chicago Press, Chicago, IL, 1991);. The numbers include mammals, birds, and reptiles. Estimation, chart and photo of a red howler monkey in Colombia by Rhett A. Butler. Please note that these are only rudimentary estimates -- there are presently no reliable projections for the number of animals hunted each year.
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The wildlife harvest takes a staggering number of animals: every year in the Brazilian Amazon alone, where 9.6 to 23.5 million mammals, birds, and reptiles are harvested. The annual harvest in the tropical forests of Africa may be 6-12 times that amount, since illegal poaching in Africa is rampant to provide meat for poor rural and urban dwellers.
In Asia, tiger populations have been dramatically reduced due to widespread habitat loss and Chinese demand for traditional medicinal products made from tiger parts. Endangered Sumatran elephants are increasingly poached for their ivory and could go extinct within 50 years at present hunting rates. In Indonesia, where there is a thriving black market for endangered wildlife, orangutans are suffering from both habitat loss and the illegal trapping of baby orangutans for the pet trade. Typically, mother orangutans are killed since they refuse to abandon their young.
In Brazil, Colombia, Nigeria, Madagascar, and other countries, the collection of wild animals for the pet trade takes its toll on local animal populations. Although such collection can be done in a sustainable manner, it rarely is. Reptiles are the fourth biggest commodity after drugs, diamonds, and weapons in the world smuggling trade, but losses are quite high: less than 10 percent of all animals exported illegally make it alive to their final destination—usually a small, dirty terrarium.
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INTRODUCTION OF ALIEN SPECIES
While not directly responsible for deforestation, the introduction of foreign plants and animals can cause severe damage to rainforests, especially in delicate ecosystems like islands. These feral species bring new diseases and compete with local species.
The bird life of Guam and Hawaii has suffered from the introduction of alien species [Invasive species news]. In the case of Guam, the culprit was a snake, while in Hawaii the mosquito and domestic chickens were responsible for the decline of native birds. Since the arrival of the Polynesians, at least 62 endemic bird species have disappeared from Hawaii. It is even more startling that Hawaii has more alien plant species than native ones. Alien weeds can choke out endemic plants, especially under disturbed forest conditions like agricultural clearing.
Additionally, alien species can wipe out endemic keystone species that play an important role in the ecosystem, like pollinating certain tree species. The elimination of such an endemic species can spell the end for the tree species and a host of other dependent plant and animal species.
Climate change is expected to increase the number of alien species in some ecosystems.
Review questions:
- Why are tigers endangered?
- How can alien or invasive species impact the environment?
Continued / Next:
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CONTENTS
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WEEKLY NEWSLETTER
INTERACT
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Recent news
Gabon steps in to help protect elephants from ivory poaching at Central African Republic site
(05/18/2013) Gabon has agreed to help battle poaching in protected areas in the Central African Republic following an elephant massacre at a renowned World Heritage site, reports the Wildlife Conservation Society (WCS).
NGO: conflict of interests behind Peruvian highway proposal in the Amazon
(05/16/2013) As Peru's legislature debates the merits of building the Purús highway through the Amazon rainforest, a new report by Global Witness alleges that the project has been aggressively pushed by those with a financial stake in opening up the remote area to logging and mining. Roads built in the Amazon lead to spikes in deforestation, mining, poaching and other extractive activities as remote areas become suddenly accessible. The road in question would cut through parts of the Peruvian Amazon rich in biodiversity and home to indigenous tribes who have chosen to live in "voluntary isolation."
Elephants massacred for ivory in Central African Republic
(05/10/2013) Dozens of elephants have been slaughtered in the Dzanga Bai World Heritage Site in the Central African Republic just days after conservationists warned about an impending threat from the movement of 17 heavily armed poachers. The massacre occurred at a site renowned as 'village of elephants', where tourists and scientists have for decades observed wild elephants congregating at a large clearing to feed on minerals.
17 poachers allegedly enter elephant stronghold in Congo, conservationists fear massacre
(05/07/2013) Local researchers and wildlife guards say 17 armed elephant poachers have gained access to Dzanga Bai, a large waterhole and clearing where up to 200 forest elephants visit daily in the Central African Republic (CAR)'s Dzanga-Ndoki National Park. WWF, which works in the region but has recently evacuated due to rising violence, is calling on the CAR government to rapidly mobilize its military to stop another elephant bloodbath in central Africa. Elephants are being killed across their range for their ivory, which is mostly smuggled to East Asia.
A Tale of Two Elephants: celebrating the lives and mourning the deaths of Cirrocumulus and Ngampit
(05/07/2013) On March 21st, the organization Save the Elephants posted on their Facebook page that two African elephants had been poached inside a nearby reserve: "Sad news from the north of Kenya. Usually the national reserves are safe havens for elephants, and they know it. But in the last two weeks two of our study animals have been shot inside the Buffalo Springs reserve. First an 18 year-old bull called Ngampit and then, yesterday, 23 year-old female called Cirrocumulus (from the Clouds family)."
More news on poaching
More rainforest news
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(02/08/2012) Protected areas in the world's tropical rainforests are absolutely essential, but one cannot simply set up a new refuge and believe the work is done, according to a new paper in Bioscience. Unsustainable hunting and poaching is decimating tropical forest species in the Amazon, the Congo, Southeast Asia, and Oceana, leaving behind "empty forests," places largely devoid of any mammal, bird, or reptile over a few pounds. The loss of such species impacts the whole ecosystems, as plants lose seed dispersers and the food chain is unraveled.
(12/15/2011) Conservationists have often found that some cultural norms, religious beliefs, and taboos play a role in holding back traditional peoples from overusing their environment. Examples of such beliefs include days wherein one cannot hunt or fish, or certain species or regions that are off limits to exploitation. But the influence of the modern world can rapidly extinguish such beliefs, sometimes for the better, in other cases not. In many parts of Madagascar, lemurs are off the menu. These primates, found only in Madagascar, play a big role in Malagasy 'fady' or taboo-related folk stories: lemurs are protectors and, in some cases, even relatives. However, according to a new paper in PLoS ONE an influx of migrants, widespread poverty, lack domestic meat, and poor law enforcement has caused a sudden rise in eating lemurs, many of which are already near-extinction due to habitat loss.
(11/14/2011) A new study finds orangutans in Indonesian Borneo in unprotected areas are being killed at a rate faster than what population viability analysis considers sustainable. Conflict between orangutans and humans is worst in areas that have been fragmented and converted for timber, wood-pulp, and palm oil production, but hunting is occurring in relatively intact forest zones away from industrial development.
(07/27/2011) Organized criminal syndicates are wiping out some of the world's most charismatic wildlife to feed a growing appetite for animal parts in East Asia#8212;and so far governments and law enforcement are dropping the ball. This is the conclusion from a new paper in Oryx, which warns unless officials start taking wildlife crime seriously a number of important species could vanish from the Earth.
(05/11/2011) Few animals face as violent, as well organized, and as determined an enemy as the world's rhinos. Across the globe rhinos are being slaughtered in record numbers; on average more than one rhino is killed by poachers everyday. After being shot or drugged, criminals take what they came for: they saw off the animal's horn. Used in Traditional Chinese Medicine, which claims that it has curative properties, rhino horn is worth more than gold and cocaine on the black market. However, science proves all this cash and death is based on a lie. 'There is no medicinal benefit to consuming rhino horn. It has been extensively analyzed in separate studies, by different institutions, and rhino horn was found to contain no medical properties whatsoever,' says Rhishja Larson.
(01/27/2011) The big mammals for which Africa is so famous are vanishing in staggering numbers. According to a study published last year: Africa's large mammal populations have dropped by 59% in just 40 years. But what is even more alarming was that the study only looked at mammal populations residing in parks and wildlife areas, i.e. lands that are, at least on paper, under governmental protection. Surveying 78 protected areas for 69 species, the study included global favorites such as the African elephant, giraffes, zebra, wildebeest, and even Africa's feline king, the lion. "We weren’t surprised that populations had dropped but we were surprised by how large the drops had been," lead author Ian Craigie told mongabay.com in an interview.
(01/10/2011) Indonesia is famed for its wildlife diversity. Straddling the contact zone between Asia and Australia, evolution has created some of the earth’s most remarkable species here. Think babirusa , Komodo dragon, orangutan and birds of paradise, and you get the picture. Indonesia is famed for its wildlife diversity. Straddling the contact zone between Asia and Australia, evolution has created some of the earth's most remarkable species here. Think babirusa, Komodo dragon, orangutan and birds of paradise, and you get the picture. Most of us also know that Indonesia has a major problem maintaining this diversity through effective conservation programs. Not a day goes by without Indonesia appearing somewhere in the world’s media with a negative story on how it is managing its wildlife.
(10/03/2010) Twenty years ago Brazil's most notorious jaguar hunter, Teodoro Antonio Melo Neto, also known as 'Tonho da onça' or 'Jaguar Tony,' swore off poaching after logging 600 kills. The foe turned ally of the jaguar then convinced environmental and research institutes, such as the non-governmental organization Instituto Pró-Carnívoros, of his about face and to employ his tracking skills for conservation. Thus began years of assisting these agencies find the animals so that they could monitor their movements and research their habits. His dramatic change of heart even became the subject of a children’s book titled Tonho da onça, which related a conservation message. But on July 20, 2010, 'Jaguar Tony,' now 71 years old, revealed his true spots when federal agents arrested him along with seven others preparing for another in a long series of illegal hunts.
(08/12/2010) Orangutan encounter rates have fallen six-fold in Borneo over the past 150 years, report researchers writing in the journal PLoS One. Erik Meijaard, an ecologist with People and Nature Consulting International, and colleagues compared present-day encounter rates with collection rates from naturalists working in the mid-19th Century. They found orangutans are much rarer today even in pristine forest areas. The results suggest hunting is taking a toll on orangutan populations.
(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.
(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.
(11/08/2009) A large flying fox eats a fruit ingesting its seeds. Flying over the tropical forests it eventually deposits the seeds at the base of another tree far from the first. One of these seeds takes root, sprouts, and in thirty years time a new tree waits for another flying fox to spread its speed. In the Southeast Asian tropics an astounding 80 percent of seeds are spread not by wind, but by animals: birds, bats, rodents, even elephants. But in a region where animals of all shapes and sizes are being wiped out by uncontrolled hunting and poaching—what will the forests of the future look like? This is the question that has long occupied Richard Corlett, professor of biological science at the National University of Singapore.
(04/20/2009) Deep in the rugged mountains of Nam Et-Phou Louey National Protected Area (NEPL) on the Laos–Vietnam border, men smoke cigarettes and talk in hushed voices as they tramp through the forest. Approaching a baited trap, they hear the frantic snarls of an ensnared tiger. The tiger hangs by its front foot, suspended by a cable attached to a tree. The men shoot and make quick work of the tiger, removing its bones but leaving some of its carcass, including parts of its pelt, behind. The real money is no longer in tiger skins, but bones: the 10 to 12 kilograms of bone harvested from the adult tiger will yield $12,000-$15,000 in a region where per capita income is around $400 a year. Though the authorities are able to trace the weapon shells back to their village and locals know of the hunters' haul, two years later the evidence has not been enough to hold the men accountable for their crimes.
(05/20/2008) Loss of wildlife is a subtle but growing threat to tropical forests, says a leading plant ecologist from Stanford University. Speaking in an interview with mongabay.com, Dr. Rodolfo Dirzo says that the disappearance of wildlife due to overexploitation, fragmentation, and habitat degradation is causing ecological changes in some of the world's most biodiverse tropical forests. He ranks defaunation — as he terms the ongoing biological impoverishment of forests — as one of the world's most significant global changes, on par with environmental changes like global warming, deforestation, and shifts in the nitrogen cycle.
(11/07/2007) While the mention of Amazon destruction usually conjures up images of vast stretches of felled and burned rainforest trees, cattle ranches, and vast soybean farms, some of the biggest threats to the Amazon rainforest are barely perceptible from above. Selective logging -- which opens up the forest canopy and allows winds and sunlight to dry leaf litter on the forest floor -- and 6-inch high "surface" fires are turning parts of the Amazon into a tinderbox, putting the world's largest rainforest at risk of ever-more severe forest fires. At the same time, market-driven hunting is impoverishing some areas of seed dispersers and predators, making it more difficult for forests to recover. Climate change -- an its forecast impacts on the Amazon basin -- further looms large over the horizon.
(05/01/2007) Commercial hunting is decimating wildlife populations across the tropics and may be one of the gravest threats presently facing rainforests, reports a series of studies published in the May issue of the journal Biotropica. The research reveals that large-scale loss of wildlife is already affecting forest health and regeneration.
