The Golden Lion Tamarin factsheet has been re-written and is currently undergoing independent peer review. Until the new factsheet is published in early 2021, the old version (from 2006) remains for your review. Please remember that this factsheet is very much out of date: recent developments in our understanding of this primate may not be reflected in the content available today. If you would like to be notified when the new factsheet is published, please don’t hesitate to get in touch!
Species: L. rosalia
Other names: golden lion marmoset; singe-lion or tamarin soyeux (French); mico-leão-dourado (Portuguese); sauí-piranga (Spanish); röd lejonapa, röd lejontamarin, större lejonapa, or vanlig lejonapa (Swedish)
Total population: approx. 1000 (wild), 500 (captive)
Gestation: 4.2 months (125 days)
Height: 261 mm (M & F)
Weight: 620 g (M), 575 to 622 g (F)
Golden lion tamarins are easily recognized New World monkeys that have fiery orange or red fur over their entire bodies including long hairs that form a striking mane on their cheeks, throat, and ears surrounding their dark, hairless faces (Rowe 1996; Kinzey 1997). The rich color of their coat is thought to be a product of sunlight exposure and the presence of carotenids in their diet (Kleiman et al. 1988). Lion tamarins (Leontopithecus) are the largest of the callitrichids. Golden lion tamarin males and females are similarly sized with the average height of 261 mm (10.3 in) and average weight around 620 g (1.37 lb). Depending on their current reproductive stage, females’ weight fluctuates, on average between 575 and 622 g (1.27 and 1.37 lb) (Dietz et al. 1994a; Rowe 1996; Sussman 2000).
One of the defining characteristics of callitrichids is their specialized nails which aid in their feeding behaviors and locomotion. Golden lion tamarins and other members of the family Callitrichidae have claw-like nails (called tegulae) instead of flat-nails (called ungulae) which humans and other primates generally exhibit, allowing them to cling vertically to tree trunks and perhaps aiding in walking, running, leaping and bounding quadrupedally along smaller branches in the forests in which they live (Sussman 2000). Because of their patterns in movement and the presence of claws, callitrichids were once thought be primitive primates, more closely related to squirrels, but these traits are highly evolved, having reappeared in golden lion tamarins and others after radiating through South America (Garber et al. 1996).
Another special characteristic of this group of primates is their tendency to give birth to twins, an unusual characteristic among primates because of the immense amount of time and energy it takes to care for just one infant. About 78% of all births in wild golden lion tamarins are twins and the energetic demand of caring for two infants has shaped the social structure and cooperative breeding patterns prevalent in golden lion tamarins (Dietz et al. 1994a; Sussman 2000). Triplets and quadruplets have also been reported for golden lion tamarins, but when a female gives birth to more than two infants, there are usually one or two weaker individuals that will not survive (Kinzey 1997). About 1% of all wild births are triplets, but in captivity, about 28% of the births are triplets (Dietz et al. 1994a).
The average lifespan of captive golden lion tamarins is 14.2 years (Rowe 1996).
CURRENT RANGE MAPS (IUCN REDLIST):
Endemic to Brazil, the range of the golden lion tamarin is extremely restricted, with animals living only in 14 highly fragmented forests remnants totaling 154 km² (59.5 mi²) in area in the state of Rio de Janeiro. They are found along the coast on the far southeastern border of the state in the municipalities of Silva Jardim, Cabo Frio, Saquarema, and Araruama (Kierulff & Rylands 2003). They have also been successfully reintroduced in the municipalities of Rio das Ostras, Rio Bonito, and Casimiro de Abreu (Kierulff et al. 2003). The only protected areas of their range are the 63 km² (24.3 mi²) Poço das Antas Biological Reserve, which holds about 230 animals, and the União Biological Reserve which is 32 km² (12.4 mi²) and has a population of about 120 individuals (Rylands et al. 2002a). Neither of these reserves has fully intact forests. In fact, only about 35 km² (13.5 mi²) of Poço das Antas is forested while only 24 km² (9.27 mi²) of União remains forested (Rylands et al. 2002a). Nevertheless, União is one of the largest tracts of well-preserved late-stage secondary and primary Atlantic Coastal rainforest in the state of Rio de Janeiro (Rapaport pers. comm.).
Burity et al. (2007) reported the occurrence of L. rosalia in the municipality of Duque de Caxias, near the Rio Taquara, in the Taquara Municipal Natural Park (19,000 ha), Rio de Janeiro, a westward extension of its current known range.
The total wild population is estimated to be 562 individuals but another 500 captively-bred animals have been reintroduced to forested areas in the historic range (Kierulff & Rylands 2003). There are about 500 individuals in captivity (Rylands et al. 2002a).
Long-term behavioral and ecological research has been conducted at Poço das Antas since its establishment in 1974. One of the main players in the establishment of a reserve for golden lion tamarins was Adelmar F. Coimbra-Filho, a pioneer in research on the species and an inspiration to researchers including Russell Mittermeier, Anthony Rylands, James Dietz, and Andrew Baker. Another notable golden lion tamarin expert is Devra Kleiman who was instrumental in captive propagation of the primate at the Smithsonian National Zoological Park in Washington DC in the mid-1970s and who continues to work on captive breeding and reintroduction (Rylands et al. 2002b).
The coastal state of Rio de Janeiro is home to the quickly disappearing Atlantic Forest habitat on which golden lion tamarins depend. They are found in severely fragmented and degraded coastal lowland forests below 300 m (984 ft) above sea level (Rylands et al. 1996; 2002a). Poço das Antas, the primary study area for wild golden lion tamarins, is divided into several habitat types. The hilltop forests occupy the highest elevations in the reserve, about 150 m (492 ft), and consist of tall, mature forest with species reaching 32 m (105 ft) in height and very little understory (Dietz et al. 1997). The hillside forests are disturbed and occur at elevations up to 120 m (394 ft). There are large gaps in tree growth allowing a dense understory to thrive. The emergent trees that do grow in hillside forests reach about 20 m (65.6 ft) in height (Dietz et al. 1997). Swamp forests are also common in Poço das Antas. These are characterized by standing water either throughout the year or during the rainy season and large trees that support heavy loads of lianas, bromeliads, and orchids. Ginger patches are another distinct habitat type. These exist in lowland areas and have a continuous herbaceous layer of growth including abundant stands of bromeliads. These distinct habitat types are connected by corridors of secondary growth and are interspersed with pasture (Dietz et al. 1997). At União Biological Reserve, golden lion tamarins utilize primary forest more frequently because of its availability. Compared to Poço das Antas, where primary forest is fairly limited to swamp lands and hillside forests are chiefly contain secondary growth, primary forest is available on hillsides and other areas besides swamps at União and the golden lion tamarins are not seen as frequently in swamps (Rapaport pers. comm.).
There is marked seasonality in the coastal lowland forests. The rainy season occurs from October to April and the dry season lasts from about June through August. May and September are considered transition months rather than grouped into the dry or wet season (Dietz et al. 1994a). During the rainy season, average rainfall is greater than 125 mm (4.92 in) per month with the heaviest rains falling in December and January. The dry season is characterized by average monthly rainfall below 75 mm (2.95 in). The least amount of rain falls in June and July (Dietz et al. 1997). Average annual precipitation is about 1756 mm (5.76 ft) (Dietz et al. 1994a; Peres 2000). Temperatures are much warmer during the wettest parts of the year with maximum temperatures between 39 and 41°C (102 and 105°F) during the rainy season and minimum temperatures between nine and 11°C (48 and 52°F) during the dry season (Dietz et al. 1994a).
Wild golden lion tamarins in Poço das Antas Biological Reserve spend most of their time in swamp forests which are largely undisturbed and intact compared to adjacent hillside forests. The trees in the swamp forests have cavities that are preferred sleeping sites and also have more of a variety of foraging opportunities compared to other areas of the reserve (Dietz et al. 1997; Kierulff et al. 2002a). With more undisturbed habitat available at União, golden lion tamarins are seen in hilly primary forest. In both reserves abundance of lianas and bromeliads are important indicators of where golden lion tamarins spend the majority of their time.
Golden lion tamarins are omnivores feeding on a wide variety of food items including fruits, flowers, insects, small vertebrates (including small reptiles), exudates, nectar, and bird eggs (Kleiman 1988; Dietz et al. 1997; Kinzey 1997). Though the majority of the remaining golden lion tamarin habitat is degraded, microhabitats exist throughout their range and are vitally important to foraging habits and other daily ranging patterns. Microhabitats in Poço das Antas include bromeliads, palm crowns, palm leaf sheaths, woody crevices, lianas, vine tangles, tree bark, rotten logs, and leaf litter (Dietz et al. 1997; Kierulff et al. 2002a). These small, but species-rich areas are important because golden lion tamarins are so adept at using their elongated fingers to catch small, cryptic prey hiding in crevices, under leaves, and in dense growth. This procedure of micromanipulation in which they use their elongated hand and fingers to extract embedded food earns lion tamarins the description of manipulative feeders (Stoinski et al. 2003). While insects make up about 10 to 15% of their diet, a more substantial part of their diet consists of small, sweet, pulpy fruits that grow on trees rather than on vines or lianas (Kierulff et al. 2002a). Fruit makes up about 80% of their diet during the rainy season, when it is readily available, but during the drier times of the year, golden lion tamarins supplement their diet with other foods such as nectars and gums (Kierulff et al. 2002a). Insects are also relatively scarce during the dry season and therefore lion tamarins rely on with other animal prey such as reptiles (Dietz et al. 1994a). Because of their primary reliance on both fruit and insects with additional foods consumed in much smaller quantities, golden lion tamarins are sometimes referred to as fauni-frugivores (Kleiman et al. 1988; Dietz et al. 1997).
Lion tamarins are active for about nine to 12 hours each day, leaving their nesting sites between shortly after sunrise and entering a new nighttime den shortly before dusk (Kierulff et al. 2002a). After leaving the sleeping site, golden lion tamarins travel and feed throughout the early morning, concentrating on fruits and, as the morning progresses, on insects. Most of the early afternoon is spent foraging for insects and resting. The late afternoon is spent traveling to the night’s sleeping site (Kierulff et al. 2002a). Golden lion tamarins sleep as a group in hollow tree cavities or in dense vines and epiphytes. They prefer sites that are between 11 and 15 m (36.1 and 49.2 ft) off the ground and repeatedly use sites within their home range, but do not generally sleep in the same spot on consecutive nights (Kleiman et al. 1988; Dietz et al. 1997). One of the reasons they sleep in relatively concealed places is to avoid predators. Being small-bodied animals, golden lion tamarins are susceptible to predation by raptors, snakes, felids and other small, carnivores (Kleiman et al. 1988; Kinzey 1997; Kierulff et al. 2002a).
During the warmer, wetter times of the year, when day length is longer, golden lion tamarins start their activities earlier and stop later than during the colder, drier season (Kierulff et al. 2002a). They vary their activity levels by season probably because of the type and quantity of food available. Feeding on gum is a behavior seen in all callitrichids, but golden lion tamarins rely on exudates only opportunistically or during the dry season, when other preferred foods are scarcer. They also use nectar as a source of sugar when fruits are most scarce. They may also spend more time foraging for insects during the dry season because of the overall scarcity of resources (Dietz et al. 1997; Kierulff et al. 2002a).
Population densities across study sites vary because of the nature of habitat fragmentation coupled with the extremely low numbers of golden lion tamarins in the wild. In Poço das Antas, the largest protected area in which they are found, there are about 12 individuals per square kilometer (7.46 per square mile). At União, however, there is a much smaller population and therefore the population density is lower with only 3.5 individuals per square kilometer (2.17 per square mile) (Kierulff et al. 2002a). Home range sizes and day ranges probably correspond to population density, resource distribution, and seasonal abundance of food resources (Rylands 1996; Kierulff et al. 2002a). Golden lion tamarins at Poço das Antas have home ranges about .45 km² (.174 mi²) and move about 1339 m (.832 mi) per day (Dietz et al. 1997). Much time is spent on the peripheral edges of their home ranges while little time is spent in the center. With the highest population density of golden lion tamarins in the world, groups may need to spend time protecting their territories from other groups rather than exploiting the center areas of their home ranges as is seen in lion tamarins at União (Kierulff et al. 2002a). At União, home ranges are large, about 1.5 km² (.579 mi²), and the golden lion tamarins there move about 1873 m (1.16 mi) per day (Kierulff et al. 2002a). They also tend to concentrate their time in the center of their home ranges and do little peripheral territory control. With fewer animals per square kilometer, competition for resources is not as strong as elsewhere and the energetic demands of defending such large home ranges is not practical given the low population densities and subsequently low levels of competition for resources (Peres 2000).
Content last modified: December 1, 2010
Written by Kristina Cawthon Lang. Reviewed by Karen Bales and Lisa G. Rapaport.
Cite this page as:
Cawthon Lang KA. 2010 December 1. Primate Factsheets: Golden lion tamarin (Leontopithecus rosalia) Taxonomy, Morphology, & Ecology. Accessed 2020 June 12.
CITES: Appendix I
IUCN Red List: L. rosalia: EN
Key: EN = Endangered
While great strides have been made to pull the golden lion tamarin away from the brink of extinction, they are still very much at risk. The extremely limited range in which the golden lion tamarins are found is within the most devastated and highly threatened ecosystem on Earth. Only about 7% of the former Atlantic Forest remains, and where it does exist, it is highly fragmented and subject to fuelwood harvesting, illegal logging, plant and animal poaching, mining, urbanization and infrastructure development, and the introduction of alien species (Galindo-Leal & de Gusmão Câmara 2003).
CONSERVATION THREATS & POTENTIAL SOLUTIONS
Threat: Human-Induced Habitat Loss and Degradation
Habitat loss and degradation is the primary historical and current threat to golden lion tamarins. Lumber extraction, agriculture, cattle ranching, and charcoal production have annihilated the Atlantic Forest and forced the remaining forest species into tiny pockets of forest, highly fragmented and isolated from one another (Kierulff et al. 2003). The pattern of unsustainable forest destruction has a long history starting with European colonization in 1500. Widespread exploitation of brazilwood as a ship-building material coupled with deliberate clearing of forest for settlement and agriculture wiped out extensive areas of forest (de Gusmão Câmara 2003). Cattle-raising was another colonial process that resulted in habitat destruction as herds were driven through forests and pastureland was cleared. Throughout the 18th and 19th centuries, massive sugarcane plantations, mining activities, and coffee cultivation further eliminated the forests of the region as demand for such products in the global economy fueled the destruction (de Gusmão Câmara 2003). But even with the massive amount of damage inflicted on the forests during the previous centuries, nothing compares to the devastation seen in the 20th century.
Growing human populations and industrialization characterized the first half of the century. Railroads built across the country opened up new areas for cultivation, disorganized exploitation of timber with little regard to regeneration, and the expansion of urban areas. Infrastructure was necessary to support a rapidly growing urban population and the timber industry eliminated nearly all of the Brazilian Atlantic Forest (de Gusmão Câmara 2003). An international oil crisis in the 1970s put further pressure on the remaining coastal forests as alcohol distilled from sugarcane was used as an alternate fuel source. Plantations of sugarcane, nonnative pine, and eucalyptus took over most of the landscape during this time period as the reliance on alcohol for fuel and the paper and pulp industry exploded (de Gusmão Câmara 2003). Forest destruction continues in the region as the ever-growing human population looks to more areas for settlement and more supplies from the shrinking reserve. Golden lion tamarins are found in the most densely populated area of Brazil and the human population continues to expand. All of the activities throughout the last 500 years have adversely affected numerous forest-dependent species, including the golden lion tamarin as their habitats have been destroyed and they are forced into increasingly smaller patches of land in their ranges.
Despite centuries of uncontrolled exploitation and little tangible protection even with the establishment of protected areas starting in the 1980s, the Atlantic Forest continues to be destroyed. Conviction to protect the remaining remnants of the region is growing among Brazilians and needs to continue if protection is to succeed in the face of strong economic interests, including agriculture and timber industries (de Gusmão Câmara 2003). The Brazilian constitution has newly added provisions specifically protecting the Atlantic Forest through enactment of laws. Legislation strictly protecting the biome through prohibition of cutting down and exploiting any vegetation in any ecosystem in the region was proposed in 1990 but is still being discussed in Congress and was no doubt slowed by politically influential developers (de Gusmão Câmara 2003). Given the constitutional requirement to protect the Atlantic Forest, the Brazilian Congress must pass enabling legislation to stop rampant forest destruction as soon as possible. There exist governmental agencies and organizations that are charged with the protection and conservation of forests and other ecosystems, including the Ministry of the Environment and the National Council on the Environment, that need the legal support to continue to effectively arrest habitat destruction (de Gusmão Câmara 2003). Economic interests in developing the Atlantic Forest region continually defeat environmental interests and this pattern must be stopped by international pressure and lobbying as well as decreased incentives for Brazilian agribusinesses to destroy forests for plantations or pastures.
Apart from the legislative changes that must occur to protect the remaining forests, focus on reestablishing corridors between fragmented pockets of forest as well as broad-scale reforestation efforts must be undertaken (Kleiman & Rylands 2002). Establishing habitat corridors between isolated subpopulations is an important focus in order to increase genetic variability in the total population and to allow for natural dispersal and group formation. Reforestation can be accomplished either through natural revegetation of a once-cleared area or through aggressive restoration planting of saplings. Propagating and raising native saplings can be a long and expensive process. Furthermore, once saplings are mature enough to survive outside of a greenhouse, planting needs to be done in such a pattern that mimics the structure of a natural forest rather than in rows like a plantation (Lugo 1988).
Finally, efforts to increase the golden lion tamarin population through translocation and captive breeding and reintroduction should continue in order to deter the effects of human-induced habitat destruction and degradation. Reintroduction is broadly defined as the return of animals that have spent any portion of their life in captivity back to the wild and is used in cases of extreme endangerment to supplement populations that are critically small or to reestablish wild groups of animals that are extinct in their former ranges (Beck et al. 1991; Kierulff et al. 2002b). In 1984, the first captive-born golden lion tamarins were returned to the wild (Beck et al. 1991). The captive population of golden lion tamarins has been maintained since the late 1970s and careful selection of breeding partners has made the captive population self-sustaining (Ballou et al. 2002). The reintroduction of these animals involved extensive training in captivity to teach them how to locomote through the forest, find and collect insects from small crevices, find and collect water from bromeliads and other sources, and introducing them to predators to gauge appropriateness of response (Beck et al. 1991). After having been trained in captivity at the National Zoological Park, tamarins were transported to Brazil, where they spent six months in quarantine to ensure they were not carrying any diseases or parasites that might infect wild tamarins with which they might come into contact (Beck et al. 1991). After the quarantine period, the captive-born golden lion tamarins were released from their cages into Poço das Antas Biological Reserve and other private lands surrounding the reserve and were supplemented with food items and sleeping sites as well as veterinary support to ensure their survival. Over time as reintroduced groups learned about natural foods and the resources within their territories, they become less reliant on food provisioning and eventually were no longer provisioned (Beck et al. 1991; Kierulff et al. 2002b). To date, about 40% of the total wild population of golden lion tamarins represents captive breeding and reintroduction efforts. Starting with 18 captive-born individuals, the population has grown as those founders produced wild-born offspring (Kierulff et al. 2002b).
A program of translocation of golden lion tamarins has been another approach to protect threatened subpopulations by moving them from a degraded area to a protected reserve or private land. Translocation involves moving wild animals from one area of their natural range to another area of suitable habitat (Kierulff et al. 2002b). This is often done an emergency basis as groups come under threat from imminent habitat destruction or other danger. Being able to move wild populations into protected areas may prevent those groups from being lost completely (Kierulff et al. 2002b). Translocated individuals have a high rate of survival and most causes of death are related to injuries obtained while fighting with another group or predation (Kierulff et al. 2002b).
Threat: Invasive Alien Species
Rapidly expanding international trade and travel coupled with ongoing changes in land use and climate in Brazil has had far reaching effects on the diversity of native flora and fauna as nonnative species are introduced and are either purposely cultivated or thrive and outcompete other species. Problematic new species include pine species, sand olive, patient lucy, guava tree, white ginger, and eucalyptus (Reaser et al. 2003). When these are planted they usurp native species and often spread so successfully that they create vast areas of monocultures. Golden lion tamarins have not evolved with these species and cannot always use the fruits they bear and may be restricted from moving within vast tracts of these plants (Coimbra-Filho & Mittermeier 1977).
Once nonnative invasive species have taken root, it is often very difficult to remove them or control their spread to other areas (Reaser et al. 2003). Well-coordinated international policies are necessary to limit the transport and spread of some of these species and need to include border patrol agencies, intergovernmental organizations, agriculture and forestry industries, and nongovernmental organizations. Furthermore, for those species that are purposely imported and planted for economic purposes, it is necessary to remove the fiscal incentives to plant these species or encourage systems of multi-cropping and shade growing to provide alternate income earning opportunities (Coimbra-Filho & Mittermeier 1977).
Threat: Harvesting (hunting/gathering)
Golden lion tamarins have been a popular pet and kept in captivity since the sixteenth century (Ballou et al. 2002). Their export continued for the pet trade, zoo exhibits, and biomedical research throughout the twentieth century. From 1960 to 1965, it was estimated that they were exported at a rate of 200 to 300 animals per month, a serious depletion of the already compromised population (Coimbra-Filho & Mittermeier 1977). Though it has been illegal to transport or sell golden lion tamarins in Brazil since 1968 and the international trade has been restricted since 1975, invariably some monkeys are still trapped and sold into the pet trade because of continuous demand (Ballou et al. 2002). Not only have they been trapped and sold as pets, but golden lion tamarins have been subject to hunting pressure, further decreasing their numbers in the wild (Kierulff et al. 2003).
Growing in popularity as a flagship species, one that captures the attention of many people and signifies a conservation effort in an area, golden lion tamarins have successfully been used in conservation education programs in Brazil and other countries (Padua et al. 2002). One of the benefits of using an easily recognized and likeable species is the ability to raise awareness about conservation efforts and educate people about individual species and the ecosystems in which they live (Dietz et al. 1994b). Through education and outreach efforts in areas surrounding Poço das Antas, educators have been successful in teaching local communities about the unique primate population in their region. This has been substantiated by the return of over 20 illegal pet golden lion tamarins and the decrease of hunting of these monkeys (Padua et al. 2002). Returned and confiscated pets are rehabilitated and often returned to the wild (Kierulff et al. 2003). Conservation education efforts should continue to involve community members in monitoring the animals, teaching them about tamarin ecology and behavior, and patrolling reserve borders.
Threat: Accidental Mortality
The only data on accidental mortality of golden lion tamarins come from studies on captive-born, reintroduced animals. Losses due to eating toxic fruit and head injuries due to falls have been recorded and are attributed to the naivete of the animals about appropriate food sources and the inability to move between trees on the thin ends of branches (Beck et al. 1991). Another source of accidental mortality in reintroduced golden lion tamarins is death caused by bee stings (Bales pers. comm.).
While there is scant data on the adverse effects of pollution on golden lion tamarins, throughout their region, water quality and habitat are degraded due to acid rain caused by nearby centers of industry with no pollution or emissions control in effect (Aguiar et al. 2003). One case of a golden lion tamarin poisoned by insecticides sprayed near a biological reserve and resulting in death has been reported. Presumably the animal ingested contaminated insects (Pissinatti et al. 2002). It is plausible that a situation like this could occur again, especially in forest fragments near plantations, though there have been no other reports.
Legislation by the Brazilian government and enforcement by officials could have some effect in controlling the pollutants released by industrial factories and sites that are the leading causes of acid rain. Plantation owners should be restricted from spraying insecticides within a certain distance of forests to decrease the likelihood of contaminating insects, a food source for golden lion tamarins. Education programs about the effects of insecticide on native species, including plants, animals and insects, could also help change patterns of use among some agriculturalists.
Threats: Changes in Native Species Dynamics
Predators of golden lion tamarins include hawks, owls, boa constrictors, and small cats. Normally a group only loses one or two individuals per predation event (Franklin & Dietz 2001). At Poço das Antas, predators have contributed significantly to the loss of golden lion tamarins. Entire groups, up to 10 individuals, are being sought after in their sleeping sites at night and eaten with the only evidence left behind being a few remains and the radio collar used by researchers to track the monkeys. In one year alone, five groups were taken by predators, reducing the population from 350 individuals to 220 in the reserve (Franklin & Dietz 2001). This represents a serious threat to the largest wild population of golden lion tamarins as the population is decreasing, group size is decreasing, infant survival to weaning is decreasing, and tamarin density within the reserve is decreasing (Franklin & Dietz 2001; Rylands et al. 2002a). Unfortunately, it is not clear what kind of animal is responsible for the carnage or if these predation events represent a change in predator-prey dynamics because of the loss of habitat (Franklin & Dietz 2001). It may be that because there is so little habitat remaining and predators are restricted to unnaturally small ranges that they have changed their foraging patterns thus adversely affecting the golden lion tamarins.
Parasites and pathogens represent another threat to wild golden lion tamarins and may change the native species dynamics of a population. Parasitic infections caused by eating rodents or coming in contact with cockroaches and some species of beetles may cause sickness or death in some cases (Pissinatti et al. 2002). Ticks, chiggers, and mites are the most commonly found ectoparasites among golden lion tamarins but probably have little to no effect on the overall health of individual monkeys.
One effort to identify the predators responsible for killing entire groups included stationing heat/motion cameras at sleeping trees in an attempt to capture the predator on camera, but no definitive evidence has been found (Franklin & Dietz 2001). If a predator is identified, biologists may be able to modify the sleeping sites, which are used repeatedly by groups of tamarins, in order to “predator-proof” them according to the type of predator involved. Expanding forest fragments may be another method of decreasing predation pressure on golden lion tamarins so predators have larger areas in which to hunt and may not rely as heavily on the highly endangered animals.
Threat: Intrinsic Factors
Genetic studies on the small population of golden lion tamarins have revealed high levels of inbreeding and low levels of genetic diversity despite scientists’ best efforts to manage proper breeding in captivity and through translocation. These patterns occur because golden lion tamarins mate with relatives they do not recognize as kin or because they do not reject them as mates (Dietz et al. 2000). This may be compounded by the fact that in small, isolated fragments, individuals have limited dispersal opportunities and are unable to enter groups that do not have their relatives. Both inbreeding depression and loss of genetic diversity have potentially serious consequences in small, fragmented populations because they may be responsible for decreased survivability or poor recruitment (Dietz et al. 2000). Inbred infants at Poço das Antas have lower survival rates than those of non-inbred infants and survivability decreases with higher rates of inbreeding. About 10% of all infants at the reserve are inbred, but this may be an underestimate because researchers assumed that all adults at the beginning of the study were unrelated (Dietz et al. 2000). Currently, this rate of inbreeding is not a threat to the viability of the population at the reserve but may not be a good indicator of other levels of inbreeding of wild golden lion tamarins groups. Because Poço das Antas is the largest reserve with the highest number of golden lion tamarins in Brazil and inbreeding levels are at about 10%, it is reasonable to assume that other forest fragments containing tamarins may be so small that inbreeding occurs at even higher rates (Dietz et al. 2000).
Genetic management of all golden lion tamarin populations may be necessary to prevent inbreeding depression from negatively impacting the survival of the species (Dietz et al. 2000). While the levels at Poço das Antas are not a hazard to the survivability of the population, models of areas with less than 50 individuals project that inbreeding depression may decrease the probability of survival of an entire population to only 60% (Dietz et al. 2000). Collecting genetic material, creating pedigrees, and managing the population based on level of relatedness in forest fragments is one way to assess the true threat of inbreeding depression and avoid its negative effects. Translocation of individuals or groups between forest fragments may enhance genetic diversity as tamarins from geographically distant forests are unlikely to be related. This is expensive and risky, though, because researchers need to be careful to avoid serious aggressive encounters between groups that might jeopardize individual tamarins (Beck et al. 1991).
Threat: Human Disturbance
Poço das Antas is surrounded by pasture maintained by cattle-raising landowners and parts of the reserve are subject to destruction by fires. Fires started by landowners to clear pasture land spread to nearby forest areas and can be especially destructive if they reach peat bogs, areas of high acidity and gaseous emissions (Pessamílio 1994).
One preventative measure is to plant a buffer of vegetation between forested areas and ranches which can act as a barrier to spreading fires. Another important component of keeping fires from spreading and destroying large areas of the reserve is to train park personnel as fire monitors and firefighters. The reserve is already equipped with fire detection infrastructure and equipment including lookout towers, fixed and portable radio-telephones, and fire-fighting equipment. The reserve’s meteorological station can be helpful in the event of a fire to determine wind direction and other variables affecting the spread of a wildland fire (Pessamílio 1994). Being prepared for a fire in the reserve is crucial, but so is educating surrounding land owners in proper burning techniques, including how to execute controlled burns and what time of year burns are least likely to get out of control. Given that the US Forest Service is already involved in training of reserve staff in firefighting techniques, perhaps they could lend their expertise to surrounding ranch owners about fire safety and management to decrease the risk of fire.
Captive breeding and reintroduction of endangered species resulting in viable wild populations has been met with limited success (Beck et al. 1994). In general, as a conservation tool, it has been expensive and rarely met the goal of creating self-sustaining populations except for a few notable instances: the North American red wolf, the Arabian oryx, and the golden lion tamarin (Beck et al. 1991; Kierulff et al. 2002b). The success of the golden lion tamarin reintroduction program can be attributed to dedicated researchers doing follow-up studies of behavioral deficiencies and survivability of captive-born reintroduced tamarins. Armed with the behavioral and mortality data, managers were able to make adjustments in the pre-release training, including novel food foraging, structural changes to enclosures to more adequately mimic forest conditions, and introduction of a variety of predators to measure fear and alarm responses (Beck et al. 1991; Stoinski & Beck 2004). Post-release support was also modified based on the results of behavioral studies and included food supplementation, provision of nest boxes for sleeping sites, and veterinary care and intervention when necessary (Beck et al. 1991; Stoinski & Beck 2004). This type of approach is a good model for other species reintroductions, both primates and other animals, and perhaps can be useful in saving other critically endangered species from certain extinction.
Content last modified: December 1, 2010
Written by Kristina Cawthon Lang. Reviewed by Karen Bales and Lisa G. Rapaport.
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Content last modified: December 1, 2010
VIDEO & WEBCAMS
- Golden Lion Tamarins (2:19, narrated; National Geographic Kids; Flash)
Photo: Lisa G. Rapaport
Photo: Lisa G. Rapaport
Photo: Lisa G. Rapaport
Photo: Lisa G. Rapaport
Photo: Lisa G. Rapaport
Photo: Lisa G. Rapaport
Photo: Lisa G. Rapaport
Photo: Luiz Claudio Marigo
Photo: Luiz Claudio Marigo
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