WSPA/APE ALLIANCERECIPES FOR SURVIVALThe magnitude of commercial bonobo hunting is not known, but their meat is openlysold in Kinshasa, Democratic Republic of Congo (Thompson-Handler et al, 1995). Thedemand <strong>for</strong> orphans is much reduced following the exodus of expatriates after rioting in1991, but poor law en<strong>for</strong>cement during the same period may have invited illegal exportof bonobos, chimpanzees and other endangered species (Thompson et al, 1995).The most recent survey conducted by the Congolese Institute <strong>for</strong> Nature Conservation(ICCN) and the World Conservation Society (WCS), in conjunction with the CITESprogramme <strong>for</strong> monitoring the illegal killing of elephants (MIKE) revealed numbers maybe down to 2% of previous levels (Black, 2004). In Salonga NP ‘where bonobos hadpreviously been found’, scientists recorded only indirect evidence of the species (calls,nests, droppings) in a quarter of the surveyed area and at lower densities thanpreviously measured. In contrast, there was abundant evidence of human encroachmentand poaching (Black, 2004). In the only country where bonobos are found, Salonga isthe sole national park within its range. Armed militias have used the dense <strong>for</strong>ests innational parks to hide and they use their munitions to subsist on bush meat, includingbonobos and elephants. The Congolese Institute <strong>for</strong> Nature Conservation has beenunable to function during the war, which ended in 1996.Although Salonga was established in 1970 to protect bonobos, no sizeable populationshave ever been confirmed. A 1987 survey revealed a group of about 20 (Meder et al,1988, cited by Thompson-Handler et al, 1995) and several other anectdotal sightings exist(d’Huart, 1989, Alers et al, 1989). The civil war suspended surveys, but a one-year studybetween 1989 and 1991 reported just one encounter (Thompson-Handler et al, 1995).Gorillas are present in 10 African countries. Since 2000, the new taxonomy hasregarded Western and Eastern gorillas as separate species.Western Gorilla Gorilla gorillaA frequently published estimate is about 95,000, but this is likely to have declinedsignificantly owing to the bushmeat trade and ebola outbreaks (Walsh et al, 2003).The figure comprises:Western Lowland Gorilla G. g. gorilla: 94,000 (Butynski, 2000)Cross River Gorilla G. g. diehli: 200 – 250 (Oates, pers.com., Butynski, 2000)Eastern Gorilla Gorilla beringeiMountain Gorilla G. b. beringei: Two populations, which some regard as separate subspeciesbut this has not yet been <strong>for</strong>mally described. The Virunga population is nowestimated at up to 380 and the Bwindi population at about 320 individuals.Eastern Lowland Gorilla G. b. graueri: Last census in 1996 gave a figure of 16,900(range 8,660 – 25,499, Hall et al, 1998), but a massive reduction in the population inand around Kahuzi-Biega National Park during the Coltan boom has led to fears of an80 – 90% crash, with perhaps only 2,000 – 3,000 remaining in small, scatteredpopulations (Redmond, 2001, Hayes, 2002). Recent reports from the Dian FosseyGorilla Fund International suggest that some populations may not have declined asmuch as feared, but accurate census data <strong>for</strong> the Kahuzi-Biega and Kasese Forest(which comprised 86 per cent of the 1996 estimate) is still being gathered by ICCN,with assistance from WCS and the Born Free Foundation.As well as being hunted <strong>for</strong> bushmeat, there is demand <strong>for</strong> gorilla hands and skulls,which are valued as trophies and <strong>for</strong> their supposed witchcraft and medicinal properties(a finger might be tied around a baby’s waist (Redmond, 1989) or ground into a powderand sprinkled into babies’ baths to help them grow strong (Pearce & Ammann, 1995)).Where bushmeat hunting is regular, gorillas are one of the first species to beeradicated (Plumptre et al, 1999).Regional estimates of annual gorilla kills range from 62 in North-east Congo (Kano &Asato, 1994), 400 – 600 in northern Congo (Redmond, 1989,) and 800 in Cameroon(Pearce & Ammann, 1995). More recent estimates <strong>for</strong> the Congo Basin as a wholesuggest an annual harvest of 4,500 (Marshall et al, 2000).In contrast, the population of mountain gorillas has risen by 17% in the past decadein the Virunga volcanoes, despite civil strife in the region (White, 2002; Kirby, 2004).Two mountain gorillas were killed in Parc National des Volcans, Rwanda, in May 2002.Be<strong>for</strong>e that, no such poaching had been recorded since 1985. Meat wasn’t taken, butone infant was missing, and so the presumption is that hunters were looking <strong>for</strong> babiesto sell (Redmond, 2002). Two further deaths were recorded, and another infantpresumed missing.Orangutans are restricted to the two South-east Asian islands of Borneo (shared byIndonesia and the Malaysian states of Sabah and Sarawak – orangutans are not foundin Brunei) and Sumatra (part of Indonesia). It has been estimated that in the last 10years, orangutans have lost almost half of their habitat to illegal logging, gold mining,conversion to palm-oil plantations and fires (Marshall et al, 2000) and, unlike the Africangreat apes, this threat is more immediate than that of hunting. Some of the <strong>for</strong>estdwellingpeople, such as Dayaks, are known to occasionally kill and eat orangutan, butthis has never escalated to a commercial trade. Nonetheless, even a very low huntingpressure leads to a population decline in such a slow-reproducing species. It isnoticeable that orangutans are more likely to survive in Moslem areas, where primatemeat is taboo, than elsewhere.Sumatran Orangutan Pongo abeliiOne estimate in late 2002 was about 3,500 and declining (Wich et al, 2003), downfrom an estimate in 1997 of 12,770 (Rijksen and Meijaard, 1999). The SumatranPRIMATE BUSHMEAT55WSPA/APE ALLIANCE54
WSPA/APE ALLIANCERECIPES FOR SURVIVALpopulation is now thought to be about 7,500 (PHVA, 2004). It is estimated, however,that since 1998, some 1,000 Sumatran orangutans have been lost annually and if thisrate continues, clearly extinction would be expected within a decade.Bornean Orangutan Pongo pygmaeusThe 1993 Population and Habitat Viability Assessment concluded that only10,200 – 15,500 orangutans remained in Borneo, but this lacked data on somepopulations, and was be<strong>for</strong>e the <strong>for</strong>est fires and illegal logging of recent years (Tilsonet al, 1993). Three sub-species are now recognised, P. p. pygmaeus, P. p. wurmbii andP. p. morio. Estimates have been substantially revised in the light of new data, but eventhough there may be more than had been feared, the downward trend is clear. Thecurrent Bornean population is estimated to be about 50,000 (Meijaard et al, 2004),compared with an estimate last century of 180,000 (Marshall et al, 2000). About8,000 individuals occur within national parks, but these are fragmented in smallpopulations, which are highly vulnerable to extinction if migration between protectedareas is not allowed (Marshall et al, 2000).Economic crises in Indonesia have led to poaching pressure on orangutans, mainly tosupply the pet trade (Yeager, 1999). Given the low population growth rate, the numberof animals removed <strong>for</strong> this purpose far exceeds what can be replaced (Marshall et al,2000). Furthermore, each orangutan orphan represents at least one dead parent, andmany orphans don’t even survive long enough to be traded. Thus, the pet trade is asignificant threat to the remaining population.4.5 Health implicationsEmerging zoonotic diseases are one of the most important public health threats facinghumanity. Close genetic correlation between humans and apes means that many of thesame viruses (<strong>for</strong> example, the common cold, influenza, pneumonia, tuberculosis,measles, yellow fever, ebola fever, hepatitis B and poliovirus) and parasites (<strong>for</strong>example, schistosomiasis, filariasis, giardiasis, salmonellosis) affect both parties andare transmissible between the two (WWF, 2003; Wolfe, 2004).Primate butchering and consumption practices and the pet trade have vastly increasedhuman exposure to and risk from wildlife diseases (Redmond, 1995; BCTF, 2003).Access to remote <strong>for</strong>ests and improved transport and trade have escalated these risks,as well as supporting the emergence of new zoonotic infections (Peeters et al, 2002).At the same time, primates are at risk from human diseases. Chimpanzee populationshave been documented suffering from fatal disease outbreaks, such as scabies,pneumonia and gut parasites, believed to originate from humans (WWF, 2003).Mountain gorillas in Rwanda, habituated <strong>for</strong> tourism, are at risk from human diseases,as are other habituated ape populations and those living near dense human settlements(WWF, 2003). Stress and fragmentation or reductions in populations as a result ofpoaching are likely to increase this risk.Simian retroviruses have long incubation periods and we may there<strong>for</strong>e see diseaseepidemics in the future as a result of infections occurring now (Peeters, 2004; Wolfeet al, 2004)4.5.1 Simian immunodeficiency viruses (SIV) and humanimmunodeficiency virus (HIV)In humans, AIDS is the end result of infection with one of two lentiviruses (HIV type 1or 2), both of zoonotic origin (BCTF, 2003). SIVchz from chimpanzees and SIVsm fromsooty mangabeys have been transmitted to humans on at least seven occasions;presumably this occurred in connection with the processing and consumption of thesespecies, since transmission occurs through body fluids such as blood (Stein et al,2002b). These transmissions are the original cause of HIV-AIDS in humans (BCTF,2003) and are an example of how pathogens that do not cause disease in their naturalhost may evolve to do so in humans. The lack of symptoms in primates carryingSIVs suggests they might be key in curing HIV-AIDS in humans (Marshall et al, 2000).As well as HIV-1 (which occurs internationally) and HIV-2 (which is restricted to WestAfrica), new recombinants are appearing in <strong>for</strong>ested areas, where hunting andpopulation growth have affected the dynamics of virus transmission (BCTF, 2003).SIVs appear to be widespread in the wild. They have been reported in 26 differentspecies of African primates, many of which are hunted <strong>for</strong> consumption; these includecolobus, sun-tailed and DeBrazza monkeys, mandrills, drills, chimpanzees and redcappedmangabeys (Stein et al, 2002b; BCTF, 2003). In Cameroon, 13 of 16 primatespecies hunted <strong>for</strong> bushmeat were found to carry SIV lineages and, 16% of speciesconsumed are thought to be SIV-infected (Peeters, 2004, Wolfe et al, 2004).PRIMATE BUSHMEAT57WSPA/APE ALLIANCE© Ian Redmond56Below: Monkeycarcass <strong>for</strong> sale inKinshasa Market,DRC; skull openedto eat brains, apractice that inother species ledto transmission ofprions causingscrapie, kuru, CJDand BSE.
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Philadelphia Zoo Bushmeat Education
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Surveys, Research,Community Researc
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Funding, Research1995 - presentFund
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