Malagasy name: Songiky Common names: White-footed sportive lemur White-footed weasel lemur
First described by Forsyth Major 1894 as Lepilemur mustelinus leucopus.
Lepilemur leucopus communicates primarily through vocalizations and touch. Members of this species have a variety of calls ranging from those for territory-defense to contact calls. Physical contact between range-mates establishes bonds and facilitates mutual grooming.
Males emit a loud and crow-like territorial call which indicates the male’s presence in his territory. When in close proximity (3 to 10 m) at territory edges, males (and more rarely females) will utter a single or a series of ‘hien’ calls followed by a single or series of higher-pitched ‘hee’ calls. These calls may also be given individually.
Either sex will give a contact-rejection call when approached in captivity or in proximity to a conspecific in the wild. It consists of 'a series of resonant hissing calls and then a two-phase vocalization'. Conspecifics have been observed hitting and biting each other while emitting a high-pitched call, presumably while in a fight over territory. This behavior has also been observed in captive animals when approached by humans. Distress calls have been noted upon capture.
Females contact their infants with a kiss-like call. This is generally heard when a mother has left her infant parked alone on a branch while she forages. The infant will call out to its mother with a ‘long, plaintive “on”’ if distressed.
Social grooming and nose-touching occur as a greeting, commonly between a mother and her adult offspring or range-mates: they nose-touch, groom each other, then rest against each other for a time.
Lepilemur leucopus does not use scent to mark territory boundaries and must rely upon calls and sight-survellience by night to find threats and food.
Communication Channels: visual ; tactile ; acoustic
Perception Channels: visual ; tactile ; acoustic ; chemical
The IUCN Red-list of 2000 lists this species as “lower risk, near threatened”. The main threats to L. leucopus are listed as hunting and habitat loss. CITES lists all species in the family Lepilemuridae on Appendix I.
There is little specific information about threats to L. leucopus. Threats to lemur populations in general include hunting for food and sport, though many native peoples have taboos against killing some species and hunting is illegal. Deforestation due to charcoal production (the trees are cut and burned) and logging by foreign oil companies destroys the habitat L. leucopus depends upon. Exportation of most lemurs is illegal but enforcement is lax and impacts are not fully understood.
Total population numbers are not known but densities of 810 individuals per square km have been reported in the Berenty Private Reserve’s gallery forest. Densities of 200 to 350 individuals per square km were found in the Didiereaceae bush.
US Federal List: no special status
CITES: appendix i
IUCN Red List of Threatened Species: data deficient
There are no known negative impacts of this species on humans.
Though there is no information available for L. leucopus, native people in Madagascar are known to eat other members of the genus Lepilemur. They may also take these animals as trophies. Both activties are illegal.
Lepilemur leucopus does not survive well outside its native environment; thus it is doubtful there is any successfull export of these animals as pets or for zoos. Also, being nocturnal, it is unlikely that any but a researcher would be interested in seeking the species out.
Positive Impacts: food
There is limited information on the ecology of L. leucopus. It has no known predators, though it likely does fall victim to some predators, thereby inhabiting a place in local food webs. Lepilemur leucopus is the known host of one ectoparasite: the tick Haemaphysalis lemuris. As a nocturnal folivore, L. leucopus has an impact on its food trees.
Ecosystem Impact: creates habitat
Commensal/Parasitic Species:
Primarily folivorous, L. leucopus eats leaves of the species Tamarindus indica and Euphorbia tiruculli, as well as species of vine. They are also known to eat the flowers of T. indica and some fruits when resources are scarce, and to practice cecotrophy (one study found no evidence of cecotrophy).
Plant Foods: leaves; fruit; flowers
Other Foods: dung
Primary Diet: herbivore (Folivore )
Lepilemur leucopus is endemic to southern Madagascar. It lives in the primary Didiereaceae forest from Tolanaro (Fort Dauphin) west to the Onilahy River.
Biogeographic Regions: ethiopian (Native )
Other Geographic Terms: island endemic
The main habitat of L. leucopus, the Didiereaceae and gallery forests of southern Madagascar, ranges from 0 to 800 m in elevation, though no elevational range for L. leucopus has been noted. The Didiereaceae forest, also called the Spiny Forest, is dominated by plants from the family Didieraeceae, spiny-leafed succulants adapted to this dry habitat. Gallery forests are rainforests along the edges of a river or stream. Both are home to L. leucopus, which can be found in the lower canopy (3 to 10 m) clinging to tree trunks and leaping between branches at night, and curled up in tree-holes or bundles of vegetation by day.
Range elevation: 0 to 800 m.
Habitat Regions: tropical ; terrestrial
Terrestrial Biomes: forest ; rainforest ; scrub forest
It is not known how long L. leucopus lives in the wild, and it does not survive well in captivity, with the longest record being two years. Lepilemur leucopus is extremely sensitive to diet and climate changes and is not known to have bred or reproduced in captivity. Other members of the genus Lepilemur are known to have lived up to 15 years in captivity. It is likely that this species has a similar potential lifespan.
Lepilemur leucopus is a medium sized, long-tailed prosimian with long fore and hind limbs used for climbing and leaping. Dorsally they are medium grey-brown with darker brown across the upper forelimbs, shoulders, and thighs. Ventrally the body is pale-grey to creamy-white. The tail is dark brown-grey. The hands and feet have large pads for clinging to trees. A folivorous diet necessitates a large caecum in this species. The average mass of a L. leucopus is 544 g, with the head and body ranging from 24 to 26 cm in length, and the tail from 21 to 26 cm. The ears are 0.32 cm long.
Average mass: 544 g.
Range length: 24 to 26 cm.
Sexual Dimorphism: sexes alike
Other Physical Features: endothermic ; bilateral symmetry
There were no accounts of L. leucopus specifically being preyed upon. However, ecologically similar sympatric species (four-marked dwarf lemurs) have been observed being attacked (though not killed) by birds of prey. Being nocturnal, L. leucopus may have few predators, but owls and nocturnal snakes are considered possible threats. There are reports of members of the genus Lepilemur being hunted by humans for food, but nowhere is L. leucopus mentioned specifically.
Though research on L. leucopus is limited, the mating system is thought to be one of polygynous scramble competition. Individuals are solitary, with a male’s territory encompassing or overlapping that of one or more females. A large male may have up to five females' territories overlapping his own, whereas a smaller male may have only one or two.
Mating System: polygynous
Lepilemur leucopus breeds once per year, between May and July. The mother gives birth to one offspring from September to November after a gestation of about 4.5 months. The infant is born with its eyes open and is able to cling to branches; after one month it can climb and jump. Lepilemur leucopus reaches sexual maturity at 18 months of age. The time to weaning and independence are not yet known for this species. However, within the genus, other species are known to wean their young around the age of 4 months. The young remain with the mother until well after their first birthday. It is likely that L. leucopus is like other members of the genus in regard to these parameters.
Breeding interval: Lepilemur leucopus breeds once per year.
Breeding season: Breeding occurs from May to July.
Average number of offspring: 1.
Average gestation period: 4.5 months.
Average age at sexual or reproductive maturity (female): 18 months.
Average age at sexual or reproductive maturity (male): 18 months.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization ; viviparous
Lepilemur leucopus young are raised entirely by their mother. The infant is born with its eyes open and the ability to cling to a branch. The mother transports her infant in her mouth when leaving the nest at night to forage, and then 'parks' it on a branch nearby while she eats; this allows her to keep the vulnerable infant nearby while she ranges out from her nest.
When it is old enough, the young lepilemur will follow its mother, learning feeding sites and social behaviors. The time to weaning and independence are not known in this species. A bond seems to develop between mother and offspring, especially mother and daughter, and will manifest throughout their lives when they meet and greet with nose-touches and grooming. A daughter may remain in the mother's territory once she is mature, whereas males tend to disperse.
Males have no known role in parental care in this species.
Parental Investment: precocial ; pre-fertilization (Provisioning, Protecting: Female); pre-hatching/birth (Provisioning: Female, Protecting: Female); pre-weaning/fledging (Provisioning: Female, Protecting: Female); pre-independence (Provisioning: Female, Protecting: Female); post-independence association with parents
