المكاك آكل الكابوريا
| Macaca fascicularis | |
|---|---|
| Ngarai Sianok, Bukittinggi, West Sumatra | |
| Conservation status | |
 Least Concern (IUCN 3.1) | |
| التصنيف الفهمي | |
| مملكة: | الحيوان |
| Phylum: | حبليات |
| تحت رتبة: | جافة الأنف |
| جنس: | المكاك |
| Species: | ''M. fascicularis'' |
| Binomial name | |
|
Macaca fascicularis Raffles, 1821 | |
| Crab-eating macaque range | |
| Synonyms | |
| |
مكاك طويل الذيل أومكاك الآكل للكابوريا (الاسم الفهمي:Macaca fascicularis) بالإنگليزية: crab-eating macaque هونوع من الحيوانات يتبع جنس السعدان المكاك من فصيلة قردة العالم القديم .
التبويب
Theعشرة subspecies of M. fascicularis are:
- Common long-tailed macaque, M. f. fascicularis
- Burmese long-tailed macaque, M. f. aurea
- Nicobar long-tailed macaque, M. f. umbrosa
- Dark-crowned long-tailed macaque, M. f. atriceps
- Con Song long-tailed macaque, M. f. condorensis
- Simeulue long-tailed macaque, M. f. fusca
- Lasia long-tailed macaque, M. f. lasiae
- Maratua long-tailed macaque, M. f. tua
- Kemujan long-tailed macaque, M. f. karimondjawae
- Philippine long-tailed macaque, M. f. philippensis
Behavior
Group living
Borneo
Borneo
Macaques live in social groups that contain three to 20 females, their offspring, and one or many males. The groups usually have fewer males than females. In social groups of macaques, a clear dominance hierarchy is seen among females. These ranks remain stable throughout the female’s lifetime and also can be sustained through generations of matrilines. Females have their highest birth rates aroundعشرة years of age and completely stop bearing young by age 24.
The social groups of macaques are female-bonded, meaning the males will disperse at the time of puberty. Thus, group relatedness on average appears to be lower than compared to matrilines. More difference in relatedness occurs when comparing high-ranking lineages to lower ranking lineages, with higher-ranking individuals being more closely related to one another. Additionally, groups of dispersing males born into the same social groups display a range of relatedness, at times appearing to be brothers, while at other times appearing to be unrelated.
In addition to the matrilineal dominance hierarchy, male dominance rankings also exist. Alpha males have a higher frequency of mating compared to their lower-ranking conspecifics. The increased success is due partially to his increased access to females and also due to female preference of an alpha male during periods of maximum fertility. Though females have a preference for alpha males, they do display promiscuous behavior. Through this behavior, females risk helping to rear a nonalpha offspring, yet benefit in two specific ways, both in regard to aggressive behavior. First, a decreased value is placed on one single copulation. Moreover, the risk of infanticide is decreased due to the uncertainty of paternity.
Increasing group size leads to increased competition and energy spent trying to forage for resources, and in particular, food. Further, social tensions build and the prevalence of tension-reducing interactions like social grooming fall with larger groups. Thus, group living appears to be maintained solely due to the safety against predation.
Conflict
Group living in all species is dependent on tolerance of other group members. In crab-eating macaques, successful social group living maintains postconflict resolution must occur. Usually, less dominant individuals lose to a higher-ranking individual when conflict arises. After the conflict has taken place, lower-ranking individuals tend to fear the winner of the conflict to a greater degree. In one study, this was seen by the ability to drink water together. Postconflict observations showed a staggered time between when the dominant individual begins to drink and the subordinate. Long-term studies reveal the gap in drinking time closes as the conflict moves further into the past.
Grooming and support in conflict among primates is considered to be an act of reciprocal altruism. In crab-eating macaques, an experiment was performed in which individuals were given the opportunity to groom one another under three conditions: after being groomed by the other, after grooming the other, and without prior grooming. After a grooming took place, the individual that received the grooming was much more likely to support its groomer than one that had not previously groomed that individual. These results support the reciprocal altruism theory of grooming in long-tailed macaques.
Crab-eating macaques demonstrate two of the three forms of suggested postconflict behavior. In both captive and wild studies, the monkeys demonstrated reconciliation, or an affiliative interaction between former opponents, and redirection, or acting aggressively towards a third individual. Consolation was not seen in any study performed.
Postconflict anxiety has been reported in crab-eating macaques that have acted as the aggressor. After a conflict within a group, the aggressor appears to scratch itself at a higher rate than before the conflict. Though the scratching behavior cannot definitely be termed as an anxious behavior, evidence suggests this is the case. An aggressor’s scratching decreases significantly after reconciliation. This suggests reconciliation rather than a property of the conflict is the cause of reduction in scratching behavior. Though these results seem counterintuitive, the anxiety of the aggressor appears to have a basis in the risks of ruining cooperative relationships with the opponent.
Kin altruism and spite
In a study, a group of crab-eating macaques was given ownership of a food object. Unsurprisingly, adult females favored their own offspring by passively, yet preferentially, allowing them to feed on the objects they held. Interestingly, when juveniles were in possession of an object, mothers robbed them and acted aggressively at an increased rate towards their own offspring compared to other juveniles. These observations suggest close proximity influences behavior in ownership, as a mother’s kin are closer to her on average. When given a nonfood object and two owners, one being a kin and one not, the rival will choose the older individual to attack regardless of kinship. Though the hypothesis remains that mother-juvenile relationships may facilitate social learning of ownership, the combined results clearly point to aggression towards the least-threatening individual.
A study was conducted in which food was given to 11 females. They were then given a choice to share the food with kin or nonkin. The kin altruism hypothesis suggests the mothers would preferentially give food to their own offspring. Yet eight of the 11 females did not discriminate between kin and nonkin. The remaining three did, in fact, give more food to their kin. The results suggest it was not kin selection, but instead spite that fueled feeding kin preferentially. This is due to the observation that food was given to kin for a significantly longer period of time than needed. The benefit to the mother is decreased due to less food availability for herself and the cost remains great for nonkin due to not receiving food. If these results are correct, crab-eating macaques are unique in the animal kingdom, as they appear not only to behave according to the kin selection theory, but also act spiteful toward one another.
Reproduction
After a gestation period of 162–193 days, the female gives birth to one infant. The infant's weight at birth is about 320 غ (11 أونصة). Infants are born with black fur which will begin to turn to a yellow-green, grey-green, or reddish-brown shade (depending on the subspecies) after about three months of age. This natal coat may indicate to others the status of the infant, and other group members treat infants with care and rush to their defense when distressed. Immigrant males sometimes kill infants not their own, and high-ranking females sometimes kidnap the infants of lower-ranking females. These kidnappings usually result in the death of the infants, as the other female is usually not lactating. A young juvenile stays mainly with its mother and relatives. As male juveniles get older, they become more peripheral to the group. Here they play together, forming crucial bonds that may help them when they leave their natal group. Males that emigrate with a partner are more successful than those that leave alone. Young females, though, stay with the group and become incorporated into the matriline into which they were born.
Male crab-eating macaques groom females to increase the chance of mating. A female is more likely to engage in sexual activity with a male that has recently groomed her than with one that has not.
Diet
Despite their name, crab-eating macaques typically do not consume crabs as their main food source; rather, they are opportunistic omnivores, eating a variety of animals and plants. Although fruits and seeds make up 60 - 90% of their diet, they also eat leaves, flowers, roots, and bark. They sometimes prey on vertebrates (including bird chicks, nesting female birds, lizards, frogs, and fish), invertebrates, and bird eggs. In Indonesia, the species has become a proficient swimmer and diver for crabs and other crustaceans in mangrove swamps. A study in Bukit Timah, Singapore recorded a diet consisting of 44% fruit, 27% animal matter, 15% flowers and other plant matter, and 14% food provided by humans.
This species exhibits particularly low tolerance for swallowing seeds. Despite their inability to digest seeds, many primates of similar size swallow large seeds, up to 25 mم (0.98 بوصة), and simply defecate them whole. The crab-eating macaque, though, spits seeds out if they are larger than 3–4 mم (0.12–0.16 بوصة). This decision to spit seeds is thought to be adaptive; it avoids filling the monkey’s stomach with wasteful bulky seeds that cannot be used for energy. It also can help the plants by distributing seeds to new areas: Crab-eating macaques eat durians such as Durio graveolens and D. zibethinus, and are a major seed disperor for the latter species.
Although the species is ecologically well-adapted and poses no threat to population stability of prey species in its native range, in areas where the crab-eating macaque is not native, it can pose a substantial threat to biodiversity. Some believe the crab-eating macaque is responsible for the extinction of forest birds by threatening critical breeding areas as well as eating the eggs and chicks of endangered forest birds.
The crab-eating macaque can become a synanthrope, living off human resources. They are known to feed in cultivated fields on young dry rice, cassava leaves, rubber fruit, taro plants, coconuts, mangos, and other crops, often causing significant losses to local farmers. In villages, towns, and cities, they frequently take food from garbage cans and refuse piles. The species can become unafraid of humans in these conditions, which can lead to macaques directly taking food from people, both passively and aggressively.
Tool use
In Thailand and Myanmar, crab-eating macaques use stone tools to open nuts, oysters, and other bivalves, and various types of sea snails (nerites, muricids, trochids, etc.) along the Andaman sea coast and offshore islands.
Another instance of tool use is washing and rubbing foods such as sweet potatoes, cassava roots, and papaya leaves before consumption. Crab-eating macaques either soak these foods in water or rub them through their hands as if to clean them. They also peel the sweet potatoes, using their incisors and canine teeth. Adolescents appear to acquire these behaviors by observational learning of older individuals.
Distribution and habitat
The crab-eating macaque lives in a wide variety of habitats, including primary lowland rainforests, disturbed and secondary rainforests, shrubland, and riverine and coastal forests of nipa palm and mangrove. They also easily adjust to human settlements; they are considered sacred at some Hindu temples and on some small islands, but are pests around farms and villages. Typically, they prefer disturbed habitats and forest periphery. The native range of this species includes most of mainland Southeast Asia, from extreme southeastern Bangladesh south through Malaysia, and the Maritime Southeast Asia islands of Sumatra, Java, and Borneo, offshore islands, the islands of the Philippines, and the Nicobar Islands in the Bay of Bengal. This primate is a rare example of a terrestrial mammal that violates the Wallace line.
Introduced range
M. fascicularis is an introduced alien species in several locations, including Hong Kong, Taiwan, Irian Jaya, Papua New Guinea, New Britain, New Ireland, New Caledonia, Solomon Islands, Fiji, Tonga, Samoa, Nauru, Vanuatu, Pohnpei, Anggaur Island in Palau, and Mauritius. Where it is not a native species, particularly on island ecosystems whose species often evolved in isolation from large predators, M. fascicularis is a documented threat to many native species. This has led the World Conservation Union (IUCN) to list M. fascicularis as one of the "100 worst invasive alien species".M. fascicularis is not a threat to biodiversity in its native range.
The immunovaccine porcine zona pellucida (PZP), which causes infertility in females, is currently being tested in Hong Kong to investigate its use as potential population control.
العلاقة بالبشر
وضع الحفاظ
الجينوم
| NCBI genome ID | 776 |
|---|---|
| Ploidy | diploid |
| حجم الجينوم | 2,946.84 Mb |
| عدد الكروموسومات | 21 pairs |
جينوم المكاك آكل الكابوريا تم سـَلسلته.
Clones
On 24 January 2018, scientists in China reported in the journal Cell the creation of two crab-eating macaque clones, named Zhong Zhong and Hua Hua, using the complex DNA transfer method that produced the sheep. This makes Zhong Zhong and Hua Hua the first primates to be cloned using the somatic cell nuclear transfer method.
انظر أيضاً
- Maggie the Macaque
- النادىرة بين الحيوانات
References
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Suppressed under the plenary power for the purposes of the Principle of Priority, but not for those of the Principle of Homonymy
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^ خطأ استشهاد: وسم
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External links
 |
مشاع الفهم فيه ميديا متعلقة بموضوع Macaca fascicularis. |
- Bonadio, C. 2000. "Macaca fascicularis" (On-line), Animal Diversity Web. Accessed March 10, 2006.
- Factsheet
- BBC Factfile on M. fascicularis
- "Conditions at Nafovanny", video produced by the British Union for the Abolition of Vivisection following an undercover investigation at a captive-breeding facility for long-tailed macaques in Vietnam.
- نطقب:UCSC genomes
خطأ لوا في وحدة:Taxonbar على السطر 140: attempt to index field 'wikibase' (a nil value).
