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Trébouet Florian Malaivijitnond Suchinda Reichard Ulrich H. 《Primates; journal of primatology》2021,62(3):491-505
Primates - Macaque reproductive patterns range from strictly seasonal breeding to non-seasonal breeding, but factors explaining this variation are not fully understood. Valid reproductive... 相似文献
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Estrogens and androgens inhibit association of RANKL with the pre‐osteoblast membrane through post‐translational mechanisms 下载免费PDF全文
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Daisuke B. Koyabu Suchinda Malaivijitnond Yuzuru Hamada 《International journal of primatology》2008,29(2):531-541
Stump-tailed macaques (Macaca arctoides) exhibit significant intraspecific variation in pelage color. Based on their pelage color and geographical distribution,
they are classified into 2 subspecies: northern bright brown Macaca arctoides arctoides and southern black Macaca arctoides melanota. However, studies on the natural population are extremely scarce, and researchers have occasionally questioned the subspecific
classification. We quantitatively examined pelage color variation of Macaca arctoides in 3 free-ranging populations in Thailand. Pelage color difference between populations is significant. The population distributed
south of the Isthmus of Kra showed wide intrapopulational variation, including bright brown, dark brown, and completely black,
whereas the northern populations primarily had dark brown hairs. Thus, we conclude that one cannot classify the color variants
into subspecies. Further, we hypothesize that the distinctive polymorphism in southern Thailand resulted from geographical
isolation caused by the Pleistocene eustatic fluctuations and subsequent recovery of land connection and subsequent gene flow. 相似文献
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Yuzuru Hamada Bambang Suryobroto Shunji Goto Suchinda Malaivijitnond 《International journal of primatology》2008,29(5):1271-1294
Long-tailed macaques (Macaca fascicularis fascicularis) are widely distributed in Southeast Asia and are morphologically and genetically (Tosi et al. in International Journal of Primatology 23:161–178, 2002) distinguishable on either side of the Isthmus of Kra (ca. 10.5°N). We compared the somatometry and body color of 15 local populations of long-tailed macaques in Thailand distributed
over areas from 6.5°N to 16.3°N and also a Thai rhesus macaque population at 17.2°N. Limb proportions and body color variation
follow the geographical trend. However, contrary to a previous report, body size does not decrease with latitude in the northern
group and also in the southern (southerly distributed) rhesus macaque. Relative tail length (RTL) and color contrast in yellow
between the back and thigh are the sole traits that distinctively separate the 2 groups: the southern group has a long relative
tail length (RTL >125%) and small color contrast, whereas the northern group has a short RTL (<120%) and large color contrast.
The southern rhesus macaques appear to have somatometric and body color traits that follow the geographical trend in long-tailed
macaques, though they maintain their distinctive species-specific traits of shorter RTL (ca. 55%), shorter relative facial length, and a bipartite body color pattern. Researchers assume that the northern group of long-tailed
macaques and the southern rhesus macaques had undergone partial introgression with each other. Montane refugia present during
the glacial period are localities in which introgression occurred in long-tailed macaques. 相似文献
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Michael D. Gumert Marius Kluck Suchinda Malaivijitnond 《American journal of primatology》2009,71(7):594-608
Stone hammering in natural conditions has been extensively investigated in chimpanzees and bearded capuchins. In contrast, knowledge of stone tool use in wild Old World monkeys has been limited to anecdotal reports, despite having known for over 120 years that Macaca fascicularis aurea use stone tools to process shelled foods from intertidal zones on islands in the Andaman Sea. Our report is the first scientific investigation to look at the stone tools used by these macaques. We observed they were skilled tool users and used stone tools daily. They selected tools with differing qualities for differing food items, and appeared to use at least two types of stone tools. Pounding hammers were used to crush shellfish and nuts on anvils and axe hammers were used to pick or chip at oysters attached to boulders or trees. We found significant physical differences between these two tools. Tools at oyster beds were smaller and exhibited scarring patterns focused more often on the points, whereas tools found at anvils were larger and showed more scarring on the broader surfaces. We also observed grip differences between the two tool types. Lastly, macaques struck targets with axe hammers more rapidly and over a wider range of motion than with pounding hammers. Both our behavioral and lithic data support that axe hammers might be used with greater control and precision than pounding hammers. Hand‐sized axe hammers were used for controlled chipping to crack attached oysters, and larger pounding hammers were used to crush nuts and unattached shellfish on anvils. In addition to stones, they also used hand‐sized auger shells (Turritella attenuata) as picks to axe attached oysters. Pound hammering appears similar to the stone tools used by chimpanzees and capuchins, but axe hammering has not yet been documented in other nonhuman primates in natural conditions. Am. J. Primatol. 71:594–608, 2009. © 2009 Wiley‐Liss, Inc. 相似文献
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Susan Lappan Suchinda Malaivijitnond Sindhu Radhakrishna Erin P. Riley Nadine Ruppert 《American journal of primatology》2020,82(8):e23176
The emergence of SARS-CoV-2 in late 2019 and human responses to the resulting COVID-19 pandemic in early 2020 have rapidly changed many aspects of human behavior, including our interactions with wildlife. In this commentary, we identify challenges and opportunities at human–primate interfaces in light of COVID-19, focusing on examples from Asia, and make recommendations for researchers working with wild primates to reduce zoonosis risk and leverage research opportunities. First, we briefly review the evidence for zoonotic origins of SARS-CoV-2 and discuss risks of zoonosis at the human–primate interface. We then identify challenges that the pandemic has caused for primates, including reduced nutrition, increased intraspecific competition, and increased poaching risk, as well as challenges facing primatologists, including lost research opportunities. Subsequently, we highlight opportunities arising from pandemic-related lockdowns and public health messaging, including opportunities to reduce the intensity of problematic human–primate interfaces, opportunities to reduce the risk of zoonosis between humans and primates, opportunities to reduce legal and illegal trade in primates, new opportunities for research on human–primate interfaces, and opportunities for community education. Finally, we recommend specific actions that primatologists should take to reduce contact and aggression between humans and primates, to reduce demand for primates as pets, to reduce risks of zoonosis in the context of field research, and to improve understanding of human–primate interfaces. Reducing the risk of zoonosis and promoting the well-being of humans and primates at our interfaces will require substantial changes from “business as usual.” We encourage primatologists to help lead the way. 相似文献
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Malaivijitnond S Lekprayoon C Tandavanittj N Panha S Cheewatham C Hamada Y 《American journal of primatology》2007,69(2):227-233
In January and March of 2005, we conducted surveys of long-tailed macaques at Piak Nam Yai Island, Laem Son National Park (9 degrees N 34-35', 98 degrees E 28'), Ranong Province, situated in southern Thailand. Two of the three troops of long-tailed macaques found on the island were observed using axe-shaped stones to crack rock oysters, detached gastropods (Thais tissoti, Petit, 1852), bivalves (Gafrarium divaricatum, Gmelin, 1791), and swimming crabs (Thalamita danae, Stimpson, 1858). They smashed the shells with stones that were held in either the left or right hand, while using the opposite hand to gather the oyster meat. Some monkeys used both hands to handle the stones. According to Matsuzawa's 1996 hierarchical classification of tool usage (levels 0-3), the tool usage by Thai long-tailed macaques could be characterized as either level 1 (cracking rock oysters with stones) or level 2 (cracking drifting mollusks and crabs with stones by placing them on a rock). Our discovery of stone-tool usage by Thai long-tailed macaques provides a new point of reference for discussions regarding the evolution of tool usage and the material culture of primates. 相似文献
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Suchinda Malaivijitnond Visit Arsaithamkul Hiroyuki Tanaka Porrawee Pomchote Sukanya Jaroenporn Bambang Suryobroto Yuzuru Hamada 《Primates; journal of primatology》2012,53(4):377-389
Based on previous conflicting reports that the two forms of pig-tailed macaque (northern and southern) exist as separate species, subspecies, or forms, and that their boundary zone lies in Thailand, a survey of the distribution range and morphology of pig-tailed macaques in Thailand was conducted during 2003–2010. We first conducted a questionnaire survey. Questionnaires were sent to 7,410 subdistricts throughout Thailand. We then traveled to 72 of the 123 subdistricts reporting the presence of pig-tailed macaques. However, due to a lack of reports of the presence of free-ranging pig-tailed macaques living south of the Isthmus of Kra, a survey of pet pig-tailed macaques was also conducted during 16–24 September 2011. Furthermore, 35 wild northern pig-tailed macaques inhabiting northern Thailand (13°13′N, 101°03′E) were temporarily caught and their morphological characters were measured and then compared to those of the southern form captured from Sumatra, Indonesia. Although largely allopatric, the ranges of the northern and southern pig-tailed macaques in Thailand were found to have a partially sympatric boundary at the Surat Thani–Krabi depression (8–9°30′N). Morphologically, these two forms were very distinctive, with different morphological characters such as the crown patch, the white color of the triangle above the eyes, the red streak at the external rim of the eyes, pelage color, ischial callosity, tail length and carriage, facial height, and limb length in both sexes, and patterns of sex skin swelling and reddening in females. These differences in morphological characters between the northern and southern forms should help settle the problems of their taxonomy. 相似文献
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Florian Trébouet Ulrich H. Reichard Nantasak Pinkaew Suchinda Malaivijitnond 《Primates; journal of primatology》2018,59(2):185-196
Extractive foraging in nonhuman primates may involve different levels of technical complexity in terms of the number of actions that must be performed and the manual dexterity involved. We describe the extractive foraging of caterpillars in wild northern pig-tailed macaques (Macaca leonina) at Khao Yai National Park, Thailand. The study group, observed from May to December 2016 (n = 146 days), comprised 60–70 habituated individuals, including 3–4 adult males, 20–23 adult females, and 36–47 immatures. Four adult males and five adult females, observed from September to November 2016 for a total of 24 days, were selected for focal animal sampling. Northern pig-tailed macaques were observed eating at least two families (Erebidae and Limacodidae) and three genera (Macrobrochis sp., Phlossa sp. and Scopelodes sp.) of caterpillars. While the monkeys ate short and small caterpillars with stinging setae and non-setae caterpillars without processing, they performed extensive caterpillar-rubbing behavior on large and long caterpillars with stinging setae. Based on 61 extractive foraging bouts, we found that caterpillar rubbing was hierarchically organized into five stages and 12 elements. Five stages of behavior sequence started with picking the caterpillar up, transporting it to a substrate, rubbing it to remove stinging setae, ingesting it, and then cleaning hands and mouth. Only adult macaques were observed using a leaf to rub stinging caterpillars. 相似文献