All sportive lemurs belong to the genus Lepilemur. In recent times, some regarded all forms as subspecies of Lepilemur mustelinus. However, due to genetic and morphological differences, these subspecific divisions became full species divisions.
Northern sportive lemurs communicate through vocal communication or calls. There are two primary calls, a loud call and a contact rejection call.
The loud call is a crow-like call used to indicate their presence and territorial claims.
The contact rejection call is a series of resonant hisses trailed by a two phase vocalization. This is heard when two individuals are close to each other in the wild. It also occurs in captivity if an individual is approached by a conspecific.
Also, many members of the genus Lepilemur engage in latrine behavior to scent mark their territorial boundaries. Therefore, it is likely that L. septentrionalis employs scent marking as a form of chemical communication.
Communication Channels: visual ; tactile ; acoustic ; chemical
Other Communication Modes: scent marks
Perception Channels: visual ; tactile ; acoustic ; chemical
Northern sportive lemurs are listed as "Vulnerable" by the IUCN. They are at risk due to a loss of habitat from the slash and burn agricultural technique practiced in its area. They are also illegally hunted for food. The total population of the species is estimated to be between 10,000 and 100,000 individuals. All members of the genus Lepilemur are considered endangered by the U.S. Endangered species act and are on the CITES Appendix I.
US Federal List: endangered
CITES: appendix i
IUCN Red List of Threatened Species: critically endangered
There are no known negative effects of northern sportive lemurs on humans.
Northern sportive lemurs are sometimes hunted for food. The endemic lemur radiation in Madagascar is a rich natural heritage, with both research and ecotourism value.
Positive Impacts: food ; ecotourism ; research and education
Northern sportive lemurs serve as prey to Sanzinia madagascariensis, a native boa species. Therefore, they have some effect on the local food webs. Also, because they are nocturnal folivores, they have an impact on the trees in the area.
Ecosystem Impact: disperses seeds
Northern sportive lemurs mainly feed on leaves, along with some flowers and fruit. They are cecotrophic, meaning they re-digest their own feces to break down the cellulose from the leaves even more. They do this because of the low energy value of leaves as a food source.
Plant Foods: leaves; fruit; flowers
Other Foods: dung
Primary Diet: herbivore (Folivore )
Like all sportive lemurs, Lepilemur septentrionalis is found on the island of Madagascar. Northern sportive lemurs are confined to the northern tip of Madagascar from the left bank of the Loky river to the coast.
Biogeographic Regions: ethiopian (Native )
Other Geographic Terms: island endemic
Northern sportive lemurs live in dry, deciduous forests and more humid evergreen forests. They spend most of the day sleeping in tree holes or dense bundles of vines. Most sleep sites are 6 to 8 m above ground, but some have been found as low as 1 m.
Average elevation: 800 m.
Habitat Regions: tropical ; terrestrial
Terrestrial Biomes: forest
The lifespan of L. septentrionalis has not been specifically studied. However, members of the genus Lepilemur have lived as long as 15 years in captivity and have an average lifespan of about 8 years . It is likely that L. septentrionalis has a similar potential lifespan.
Average lifespan
Status: captivity: 15 years.
Average lifespan
Status: wild: 8 years.
Northern sportive lemurs are among the smallest members of the genus Lepilemur. They grow to around 53 cm, with a head and body length averaging 28 cm and tail length averaging 25 cm. The average weight of northern sportive lemurs is 0.7 to 0.8 kg. Their coloration is grey-brown and is darkest at the crown. There is a dark grey stripe that begins at the crown and runs down the dorsal line. The underside is grey. Northern sportive lemurs have enlarged, fleshy pads on their hands and feet that improve their grasp on tree branches, making them agile in the trees. They have binocular vision and large eyes. They have a large caecum to accomodate their folivorous diet. The ears are much less prominent in L. septentrionalis than in other members of the genus Lepilemur.
Average mass: 0.7 kg.
Average length: 28 cm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: sexes alike
Northern sportive lemurs are preyed upon by Sanzinia madagascariensis, a boa species native to Madagascar, which takes the lemurs from their holes during the daytime, while they sleep. Also, members of the genus Lepilemur are sometimes hunted for food by humans, so it is likely that L. septentrionalis is hunted for food. Large birds of prey are also likely to prey on northern sportive lemurs.
Northern sportive lemurs are agile and wary, and try to avoid many predators by being inactive during the day and staying in the trees.
Known Predators:
Male northern sportive lemurs are solitary and have territories that overlap those of one or more females. Males are polygynous and will visit each female in their territory during the mating season.
Mating System: polygynous
Within Lepilemur birthing happens between September and December, after a gestational period of 120 to 150 days. The young are weaned at four months, but can remain with the mother for up to a year, and they typically reach sexual maturity at around 18 months. Although there is little specific information on northern sportive lemurs, it is likely that reproduction is similar to other Lepilemur species.
Breeding interval: Lepilemur septentrionalis breeds once per year.
Breeding season: Breeding occurs from April to August.
Average number of offspring: 1.
Range gestation period: 120 to 150 days.
Average weaning age: 4 months.
Average time to independence: 1 years.
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
Females give birth to one offspring each year. Offspring are raised entirely by the mother. The mother lives with and cares for the offspring by providing food and protection, but will leave the offspring on a branch when going to forage for food.
Parental Investment: 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
