Milne-Edwards's sifaka

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Milne-Edwards's sifaka
Milne Edwards's sifaka (Propithecus edwardsi).jpg
In Ranomafana National Park
CITES Appendix I (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Primates
Suborder: Strepsirrhini
Family: Indriidae
Genus: Propithecus
Species:
P. edwardsi
Binomial name
Propithecus edwardsi
Propithecus edwardsi range map.svg
Distribution of P. edwardsi [1]
Synonyms
  • bicolorGray, 1872
  • holomelasGünther, 1875

Milne-Edwards's sifaka (Propithecus edwardsi), or Milne-Edwards's simpona, is a large arboreal, diurnal lemur endemic to the eastern coastal rainforest of Madagascar. Milne-Edwards's sifaka is characterized by a black body with a light-colored "saddle" on the lower part of its back. It is closely related to the diademed sifaka, and was until recently considered a subspecies of it. [3] Like all sifakas, it is a primate in the family Indriidae.

Contents

The species' name honors French zoologist Henri Milne-Edwards (1800–1885).

Conservation status

Milne-Edwards's sifaka is categorized as endangered by the IUCN, and is listed in CITES Appendix I. [1] [2] As of 2008, there were estimated to be approximately 28,600 individuals left with only about 3,500 of those remaining in protected areas. [4] It remains threatened by habitat loss, hunting and may be sensitive to a changing climate. [4]

Anatomy and physiology

In Ranomafana National Park Milne-Edward's Sifaka (Propithecus diadema edwardsi).jpg
In Ranomafana National Park

Milne-Edwards's sifaka is the second largest species in Propithecus, and one of the larger diurnal lemur species overall. The average weight of a male Milne-Edwards's sifaka is 5.90 kg (13.0 lb) and for females it is 6.30 kg (13.9 lb). The body length excluding the tail is 47.6 cm (18.7 in) for males and females measure 47.7 cm (18.8 in). [5] The tail is slightly shorter than the body, averaging 455 mm (17.9 in) in length or about 94% of the total head and body length. [6]

The Milne-Edwards's sifaka has a typical Propithecus body shape with orange-red eyes and a short, black, bare face ringed by a puffy spray of dark brown to black fur. The majority of its coat is dark brown or black long silky fur, but on the center of the sifaka's back and flanks is a brown to cream colored saddle shaped area which is divided in half by a line of dark fur along the spine. The shape and coloration of the saddle patch vary by individual. The Milne-Edwards' sifaka exhibit neither sexual dimorphism nor sexual dichromatism. [5]

As with all lemurs, the Milne-Edwards's sifaka has special adaptations for grooming, including a toilet-claw on its second toe, and a toothcomb. [7] [8]

The hands and feet of the lemur have prehensile "thumbs" and big toes, which allow it to maintain a superb grip on trunks and branches. The pads of its fingers and toes are rough and have a large contact area. Its nails are also sharp and pointed, which allows them to dig in if it slips. The big toe of the Milne-Edwards's sifaka and indrids in general is longer and has a deeper cleft compared to that of lemurids. This is thought to reflect stronger grasping abilities. [9]

Locomotion

Dorsal view Milne-Edwards' sifaka (Propithecus edwardsi) (15720305930).jpg
Dorsal view

The arboreal lifestyle of P. edwardsi demands high coordination, a well-developed grip, and considerable acrobatics. This lemur moves by vertical clinging and leaping, meaning it maintains an upright position leaping from tree trunk to tree trunk and moving along branches. It leaping between trees, the Milne-Edwards's sifaka performs a 180 degree twist in midair so that it is facing the incoming landing target. Primarily movements of the arms but also those of the tail are used to adjust the body's rotation and stability on the fly. When landing, the Milne-Edwards's sifaka swings its tail and outstretched forearms downward to help keep the body forward much like a long-jumper. It hands hind legs first. The tail and one arm is flung forward turing takeoff. [6]

Milne-Edwards's sifakas can probably leap between 8 and 10 m (26 and 33 ft). The lemur rarely descends from the relative safety of the canopy, so spends little time on the ground. P. edwardsi will solely use trees to traverse its habitat, however if forced to cross open area like roads it will use a bipedal sideways hop. [10] [11]

The Milne-Edwards's sifaka can hang from its hind legs upside-down. [9]

The sifaka practices climbing and leaping in its infancy when it ventures from its mother's back. It is not uncommon for infant lemurs to fall, whereupon the mother quickly comes to the infant's assistance. Adult lemurs typically do not fall although they may occasionally lose their grip if the bark of the tree shears off from beneath their fingers. Lemurs may carry food while they travel in their hands, though they prefer to place the objects in their mouth.

Genus Propithecus Feet.jpg

Ecology

Geographic range and habitat

Milne-Edwards's sifaka is endemic to the island of Madagascar off the southeastern coast of Africa. Milne-Edwards's sifaka is found in primary and secondary rainforests on the southeastern part of the island at elevations between 600 and 1,600 m (2,000 and 5,200 ft). Milne-Edwards' sifaka has the southernmost range of the diademed sifakas. The Mangoro and Onive rivers border the northern part of its range and its southern range extends to Andringitra National Park and the Rienana River. [5] [12]

Sympatric relations

The following lemur species can be found within the same geographic range as the Milne-Edwards's sifaka: [5] [13]

Behavior

Nestling in foliage Propithecus edwardsi2.jpg
Nestling in foliage

The behavior and social organization of P. edwardsi is particularly well studied. [5] The Milne-Edwards's sifaka is arboreal, diurnal, territorial, and group-forming. Females are dominant over males, typical of lemurs but extremely rare in all other primates.

Diet

The Milne-Edwards's sifaka's diet is composed primarily of both mature and immature leaves and seeds, but they also regularly consume flowers and fruit. They also supplement their diet with soil and subterranean fungus. In the process of foraging, the Milne-Edwards' sifakas range an average of 670 m (2,200 ft) per day. [5]

Social organization

Milne-Edwards's sifakas form multi-male/multi-female, multi-age groups of between three and nine individuals with a mean group size of 4.8. [5] Depending on the number and gender of individuals, the group may be polygynandrous, polyandrous, polygynous, or monogamous. Shifts in the number of individuals or the ratio of males and females will affect the social structure. The groups provide protection from predators, while the size is limited by inter-group competition for seasonal feeding resources. Group dynamics are probably dictated by balancing the benefits and costs of predation protection, inter-group competition for food resources, and mating opportunities. About half of Milne-Edwards's sifakas of the individuals of both sexes born in a particular group will emigrate; females leave as juveniles, while males can leave as both juveniles and adults. [5]

Reproduction

Milne-Edwards's sifakas become sexually mature at 2 or 3 years or age. Milne-Edwards's sifakas have one mating season annually during the austral summer in the months of December and January. Females give birth during the austral winter months of May and July after a 179-day gestation. [5]

Research

Most of the research on Propithecus edwardsi is conducted at Ranomafana National Park in Madagascar. Most of the lemurs are collared and the lead females carry a tracking device. Currently there are no captive lemurs of this species.

Related Research Articles

<span class="mw-page-title-main">Indriidae</span> Family of lemurs

The Indriidae are a family of strepsirrhine primates. They are medium- to large-sized lemurs, with only four teeth in the toothcomb instead of the usual six. Indriids, like all lemurs, live exclusively on the island of Madagascar.

<span class="mw-page-title-main">Lemuridae</span> Family of lemurs

Lemuridae is a family of strepsirrhine primates native to Madagascar and the Comoros. They are represented by the Lemuriformes in Madagascar with one of the highest concentration of the lemurs. One of five families commonly known as lemurs. These animals were once thought to be the evolutionary predecessors of monkeys and apes, but this is no longer considered correct. They are formally referred to as lemurids.

<span class="mw-page-title-main">Sifaka</span> Genus of lemur

A sifaka is a lemur of the genus Propithecus from the family Indriidae within the order Primates. The name of their family is an onomatopoeia of their characteristic "shi-fak" alarm call. Like all lemurs, they are found only on the island of Madagascar. All species of sifakas are threatened, ranging from endangered to critically endangered.

<span class="mw-page-title-main">Lemur</span> Clade of primates endemic to the island of Madagascar

Lemurs are wet-nosed primates of the superfamily Lemuroidea, divided into 8 families and consisting of 15 genera and around 100 existing species. They are endemic to the island of Madagascar. Most existing lemurs are small, have a pointed snout, large eyes, and a long tail. They chiefly live in trees and are active at night.

<span class="mw-page-title-main">Ring-tailed lemur</span> A large lemur from Madagascar

The ring-tailed lemur is a medium- to larger-sized strepsirrhine (wet-nosed) primate, and the most internationally-recognized lemur species, owing to its long, black-and-white, ringed tail. It belongs to Lemuridae, one of five lemur families, and is the only member of the Lemur genus. Like all lemurs, it is endemic to the island of Madagascar, where it is endangered. Known locally in Malagasy as maky or hira, it ranges from gallery forests to spiny scrub in the southern regions of the island. It is omnivorous, as well as the most adapted to living terrestrially of the extant lemurs.

<span class="mw-page-title-main">Madagascar lowland forests</span> Ecoregion in Eastern Madagascar

The Madagascar lowland forests or Madagascar humid forests are a tropical moist broadleaf forest ecoregion found on the eastern coast of the island of Madagascar, home to a plant and animal mix that is 80 to 90% endemic, with the forests of the eastern plain being a particularly important location of this endemism. They are included in the Global 200 list of outstanding ecoregions.

<span class="mw-page-title-main">Verreaux's sifaka</span> Species of lemur

Verreaux's sifaka, or the white sifaka, is a medium-sized primate in one of the lemur families, the Indriidae. It lives in Madagascar and can be found in a variety of habitats from rainforest to dry deciduous forests of western Madagascar and the spiny thickets of the south. Its fur is thick and silky and generally white with brown on the sides, top of the head, and on the arms. Like all sifakas, it has a long tail that it uses as a balance when leaping from tree to tree. However, its body is so highly adapted to an arboreal existence, on the ground its only means of locomotion is hopping. The species lives in small troops which forage for food.

<span class="mw-page-title-main">Eastern woolly lemur</span> Species of lemur

The eastern woolly lemur, also known as the eastern avahi or Gmelin's woolly lemur, is a species of woolly lemur native to eastern Madagascar, where it lives in the wet tropical rainforest at low elevations along the eastern coast of the island or they can also inhabit the northern tip of the island with other species. The woolly lemur name refers to their thick, tightly curled hair, whereas their generic name avahi refers to their high-pitched defensive call. The eastern woolly lemur almost has an owl-look with its large eyes, small rounded head, and ears that are mostly hidden. This nocturnal animal weighs 1.0–1.3 kg (2.2–2.9 lb) and reaches a length of 27–29 cm (11–11 in) with a tail of 33–37 cm (13–15 in). Its diet consists mainly of leaves and buds with fruits, flowers, and bark.

<span class="mw-page-title-main">Diademed sifaka</span> Species of lemur

The diademed sifaka, or diademed simpona, is an endangered species of sifaka, one of the lemurs endemic to certain rainforests in eastern Madagascar. Along with the indri, this species is one of the two largest living lemurs, with an average weight of 6.5 kg and a total adult length of approximately 105 centimetres (41 inches), half of which is its tail. Russell Mittermeier, one of the contemporary authorities on lemurs, describes the diademed sifaka as "one of the most colorful and attractive of all the lemurs", having a long and silky coat. P. diadema is also known by the Malagasy names simpona, simpony and ankomba joby. The term "diademed sifaka" is also used as a group species designation formerly encompassing four distinct subspecies.

<span class="mw-page-title-main">Coquerel's sifaka</span> Diurnal, medium-sized lemur

Coquerel's sifaka is a diurnal, medium-sized lemur of the sifaka genus Propithecus. It is native to northwest Madagascar. Coquerel's sifaka was once considered to be a subspecies of Verreaux's sifaka, but was eventually granted full species level, and is listed as Critically Endangered on the IUCN Red List due to habitat loss and hunting. In popular culture, it is known for being the species of the title character in the children's TV show Zoboomafoo. The species was named after French entomologist Charles Coquerel.

<span class="mw-page-title-main">Golden-crowned sifaka</span> A medium-sized lemur with mostly white fur, prominent furry ears, and a golden-orange crown

The golden-crowned sifaka or Tattersall's sifaka is a medium-sized lemur characterized by mostly white fur, prominent furry ears, and a golden-orange crown. It is one of the smallest sifakas, weighing around 3.5 kg (7.7 lb) and measuring approximately 90 cm (35 in) from head to tail. Like all sifakas, it is a vertical clinger and leaper, and its diet includes mostly seeds and leaves. The golden-crowned sifaka is named after its discoverer, Ian Tattersall, who first spotted the species in 1974. However, it was not formally described until 1988, after a research team led by Elwyn L. Simons observed and captured some specimens for captive breeding. The golden-crowned sifaka most closely resembles the western forest sifakas of the P. verreauxi group, yet its karyotype suggests a closer relationship with the P. diadema group of eastern forest sifakas. Despite the similarities with both groups, more recent studies of its karyotype support its classification as a distinct species.

<span class="mw-page-title-main">Greater dwarf lemur</span> Species of lemur

The greater dwarf lemur, or the Geoffroy's dwarf lemur, is a lemur that is widely distributed over the primary and secondary forests near the eastern coast of Madagascar. They are also found in northern parts of Madagascar. Greater dwarf lemurs live in forests and dry scrub areas. The head and body of the greater dwarf lemur can range from 167 to 264 millimeters in length, and 164 to 600 grams. Their tails can range from 195 to 310 millimeters in length.

<span class="mw-page-title-main">White-headed lemur</span> Species of lemur

The white-headed lemur, also known as the white-headed brown lemur, white-fronted brown lemur, or white-fronted lemur, is a species of primate in the family Lemuridae. It is only found in north-eastern Madagascar. It is arboreal and is usually found in rainforest treetops. It was formerly recognised as a subspecies of the common brown lemur.

<span class="mw-page-title-main">Silky sifaka</span> A large lemur from Madagascar

The silky sifaka is a large lemur characterized by long, silky, white fur. It has a very restricted range in northeastern Madagascar, where it is known locally as the simpona. It is one of the rarest mammals on Earth. The silky sifaka is one of nine sifaka species, and one of four former subspecies of diademed sifaka (P. diadema). Studies in 2004 and 2007 compared external proportions, genetics, and craniodental anatomy supporting full species status, which has generally been accepted.

<span class="mw-page-title-main">Perrier's sifaka</span> Species of lemur

Perrier's sifaka is a lemur endemic to Madagascar. It was formerly considered to be a subspecies of diademed sifaka It has a very small range in northeastern Madagascar where its habitat is dry deciduous or semihumid forest. Part of its range is in protected areas. It is an almost entirely black sifaka and measures about 90 cm (35 in), half of which is a bushy tail. Females are slightly larger than males.

<span class="mw-page-title-main">Crowned sifaka</span> Species of mammal

The crowned sifaka is a sifaka endemic to western Madagascar, a part of the world where nature and its biological diversity faces enormous and devastating consequences resulting from anthropogenic activities. It is a species of lemur belonging to the Idriidae family, it is of comparable size to the Golden-crowned sifaka and up to a meter in length, of which 47-57 centimeters are tail. The species is an arboreal vertical climber and leaper whose diet consists of leaves, fruits and flowers. It is threatened by habitat destruction caused by human activities and is currently classified as critically endangered by the IUCN. Conservation planning needs to take local people needs and views into account in order to be successful over the long term.

<span class="mw-page-title-main">Evolution of lemurs</span> History of primate evolution on Madagascar

Lemurs, primates belonging to the suborder Strepsirrhini which branched off from other primates less than 63 million years ago, evolved on the island of Madagascar, for at least 40 million years. They share some traits with the most basal primates, and thus are often confused as being ancestral to modern monkeys, apes, and humans. Instead, they merely resemble ancestral primates.

References

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