Geographic Range
Indonesian mountain weasels are only found on the islands of Java and Sumatra in Indonesia.
Indonesian mountain weasels are island endemic and native to the Oriental biogeographic
ragion. More surveys need to be conducted in these areas to determine their exact
distribution and home ranges.
- Other Geographic Terms
- island endemic
Habitat
Indonesian mountain weasels, as their names suggests, live in the tropical rainforest
mountainous regions of Indonesia. However, very little is known about their preferred
habitat conditions besides their preference for higher elevations. It is believed
that their elevation ranges from 1,000 m to 2,200 m, but little is known of how they
function at extreme elevations or if they can live outside of their range. According
to the IUCN there are only 15 known specimen of the Indonesian mountain weasel, and
of those only 12 have a locality. More surveys and research is needed to determine
habitat range and preference.
- Habitat Regions
- tropical
- terrestrial
- Terrestrial Biomes
- rainforest
- mountains
Physical Description
The Indonesian mountain weasel as a weasel has very specific traits that all in their
genus share. Weasels have long, slender bodies with short legs. This body design allows
them to enter any place in which they can stick their heads. A long slender body has
costs; while their metabolic rate tends to be similar to other mammals of the same
size, they tend to lose heat much faster due to their shape (Brown and Lasiewski,
1972). The Indonesian mountain weasel tends to be between 279 m and 321 m from head
to the base of the tail. The tail is about 136 mm to 170 mm long (Eaton, 2009).
There is very little information specifically on the Indonesian mountain weasel, however,
we know that they have reddish-brown fur and a foramen on their skull by which they
can be identified. This foramen is located "in the medial part of the auditory bullae,
mid-way along the anterior-posterior axis, at the point where the bullae attach to
the skull" (Meiri, Duckworth, and Meijarrd, 2007).
- Other Physical Features
- endothermic
- homoiothermic
- bilateral symmetry
- Sexual Dimorphism
- male larger
Reproduction
As a member of the
badgers, otters, and weasels family
, Indonesian Mountain weasels have a polygnous mating system in which the males will
fight for access to a female. It is noted that these fights can be extremely vicious.
Weasels are solitary creatures and the mating season is often the only time adults
will interact with one another. This type of behavior is called a solitary-territorial
mating system (Bright, 2000). The specifics of Indonesian mountain weasel mating habits
are unknown.
- Mating System
- polygynous
Indonesian mountain weasels become sexually mature at about a year of age. Their breeding
season is believed to be between March and May, followed by a gestation period of
approximately 30 days. ndonesian mountain weasels, like other weasels, give birth
to altricial young. This means that the young are born with their eyes shut and with
very little fur. The pups rely solely on their mother for care. It takes about a month
for pups eyes to fully open, and another month after which they will become fully
weaned.
- Key Reproductive Features
- iteroparous
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- sexual
- viviparous
For weasels, care of young fall on the mother alone. Even though the young are altricial,
they are fully weaned after 2 months and leave their mother. However, the litter tends
to prefer to remain together until Autumn.
- Parental Investment
- altricial
- female parental care
-
pre-weaning/fledging
-
provisioning
- female
-
provisioning
Lifespan/Longevity
Little is known about how long Indonesian mountain weasels live, but some suggest
between 7 to 10 years of age (indonesianfauna.com, 2004). Nor do they known about
the lifespan of Indonesian mountain weasels in captivity. However, other species of
weasels live up to 20 years in the wild and do very well in captivity (Walker et al.,
1964).
Behavior
Very little is known about the behavior of the Indonesian mountain weasel. Other weasels
tend to be solitary and nocturnal only interacting for breeding or over territory
disputes.
Home Range
Since they have a solitary-territorial mating system, a females main concern is defending
a home range that will provide sufficient resources for her offspring. Whereas males
want to have a home range that will contain as many females as possible. However,
the exact range for them is unknown.
Communication and Perception
As with other weasel species Indonesian mountain weasels will communicate primarily
with odors and secondarily with "clicks" or other auditory noises.
- Communication Channels
- chemical
- Other Communication Modes
- scent marks
Food Habits
Weasels are completely carnivorous and the Indianian mountain weasel is no different.
They are especially adapted to eating rodents; their agility and speed allows them
to take down prey much larger than themselves. They are also very good at removing
rodents from their burrows. Some species of weasels are known to stay at one prey
den until they have completely eliminated all of the inhabitants.
- Primary Diet
-
carnivore
- eats terrestrial vertebrates
- eats eggs
- Animal Foods
- birds
- mammals
- amphibians
Predation
Indonesian mountain weasels have no known predators, aside from humans. It is believed
that due to their fierce nature, it would not be worth a predators effort to attempt
to consume them. It is believed that some weasel species are eaten by foxes. While
there are no foxes in Indonesia it is possible some of the other carnivores might
be a threat to Indonesian mountain weasels.
Ecosystem Roles
Weasels are pest controlers and have been known to eradicate species from their home
ranges.
Economic Importance for Humans: Positive
Indonesian mountain weasels are known to keep rodent populations in check; a common
pest for humans.
- Positive Impacts
- controls pest population
Economic Importance for Humans: Negative
No specific negative effects to humans are known, but weasels are known to eat poultry.
This can be a big problem for farmers in the area who use poultry as a main source
of income or food.
- Negative Impacts
- household pest
Conservation Status
Indonesian mountain weasels are endangered because they are endemic to a very small
area and because they are very poorly known. They are among the rarest of the weasel
family and face issues with habitat fragmentation. Habitat fragmentation has a very
strong correlation with declines in weasel abundance.
Additional Links
Contributors
Amelia Hunt (author), University of Alaska Fairbanks, Laura Prugh (editor), University of Washington, Laura Podzikowski (editor), Special Projects.
- oriental
-
found in the oriental region of the world. In other words, India and southeast Asia.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- island endemic
-
animals that live only on an island or set of islands.
- tropical
-
the region of the earth that surrounds the equator, from 23.5 degrees north to 23.5 degrees south.
- terrestrial
-
Living on the ground.
- rainforest
-
rainforests, both temperate and tropical, are dominated by trees often forming a closed canopy with little light reaching the ground. Epiphytes and climbing plants are also abundant. Precipitation is typically not limiting, but may be somewhat seasonal.
- mountains
-
This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.
- endothermic
-
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
- bilateral symmetry
-
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
- polygynous
-
having more than one female as a mate at one time
- iteroparous
-
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
- seasonal breeding
-
breeding is confined to a particular season
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- viviparous
-
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
- altricial
-
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
- female parental care
-
parental care is carried out by females
- fossorial
-
Referring to a burrowing life-style or behavior, specialized for digging or burrowing.
- nocturnal
-
active during the night
- motile
-
having the capacity to move from one place to another.
- solitary
-
lives alone
- chemical
-
uses smells or other chemicals to communicate
- scent marks
-
communicates by producing scents from special gland(s) and placing them on a surface whether others can smell or taste them
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- acoustic
-
uses sound to communicate
- chemical
-
uses smells or other chemicals to communicate
- carnivore
-
an animal that mainly eats meat
References
Amstislavsky, S., Y. Ternovskaya. 2000. Reproduction in mustelids. Animal Reproduction Science , 60-61: 571-581.
Bright, P. 2000. Lessons from lean beasts: conservation biology of the mustelids. Mammal Review , 30: 217-226.
Brown, J., R. Lasiewski. 1972. Metabolism of Weasels: The Cost of Being Long and Thin. Ecology , 53: 939-943.
Duckworth, J., L. Barney, A. Abramov. 2008. "Mustela Lutreolina" (On-line). IUCN Red List. Accessed October 01, 2012 at http://www.iucnredlist.org/details/14019/0 .
Eaton, J. 2009. An Observatino of Indonesian Mountain Weasel Mustela Lutreolina at Gunung Kerinci, Sumatra, Indonesia.. Small Carnivore Conservation , 40: 27-28.
Erlinge, S., M. Sandell. 1988. Coexistence of stoat, Mustela erminea, and weasel, M. nivalis: social dominance, scent communication, and reciprocal distribution. OIKOS , 53: 242-246.
Johnson, D., D. MacDonald, A. Dickman. 2000. An analysis and review of the sociobiology of Mustelidae. Mammal Review , 30: 171-196.
Meiri, S., J. Duckworth, E. Meijaard. 2007. Biogeography of Indonesian Mountain Weasel Mustela lutreolina and a newly discovered specimen. Small Carnivore Conservation , 37: 1-5.
Moors, P. 1980. Sexual dimorphism in the body size of mustelids (Carnivora): the rolse of food habitas and breeding systems. OIKOS , 34: 147-158.
Walker, E., F. Warnick, K. Lange, H. Uible, M. Davis, P. Wright. 1964. Mammals of the World Volume II . Baltimore: Johns Hopkins Press.
indonesianfauna.com. 2004. "Indonesian Mountain Weasel" (On-line). Indonesian Fauna. Accessed October 01, 2012 at http://www.indonesianfauna.com/indonesianmountainweasel.php .