American Journal of Primatology

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Possible audience effect in thomas langurs (primates; presbytis thomasi): An experimental study on male loud calls in response to a tiger model
American Journal of Primatology - Tập 60 Số 4 - Trang 155-159 - 2003
Serge A. Wich, Elisabeth H. M. Sterck
AbstractRecent research indicates that animal vocalizations can refer to objects in the outside world, and that call production may be controlled by the sender depending on the type of audience involved. Our research on wild male Thomas langurs (Primates: Presbytis thomasi) shows that these males call as a response to a tiger model when they are in a group, but do not call when they are solitary. ... hiện toàn bộ
Incisor microwear and feeding behavior in Alouatta seniculus and Cebus olivaceus
American Journal of Primatology - Tập 20 Số 1 - Trang 43-50 - 1990
Peter S. Ungar
AbstractDental microwear features on the labial surfaces of maxillary central incisors of wild‐shot museum specimens of Cebus olivaceus (n = 11) and Alouatta seniculus (n = 7) were examined at 200 × by polarized light microscopy. While wear scratch orientation patterns do not differ between the two samples, Cebus has a significantly higher density of wear features, and displays scratches that exte... hiện toàn bộ
Mechanical properties of foods used in experimental studies of primate masticatory function
American Journal of Primatology - Tập 67 Số 3 - Trang 329-346 - 2005
Susan H. Williams, Barth W. Wright, Van Den Truong, Christopher R. Daubert, Christopher J. Vinyard
Neuropeptide Y‐immunoreactive Neurons in the Cerebral Cortex of Humans and Other Haplorrhine Primates
American Journal of Primatology - Tập 75 Số 5 - Trang 415-424 - 2013
Mary Ann Raghanti, TIFFINI CONLEY, Jessica Sudduth, Joseph Erwin, Cheryl D. Stimpson, Patrick R. Hof, Chet C. Sherwood
We examined the distribution of neurons immunoreactive for neuropeptide Y (NPY) in the posterior part of the superior temporal cortex (Brodmann's area 22 or area Tpt) of humans and nonhuman haplorrhine primates. NPY has been implicated in learning and memory and the density of NPY‐expressing cortical neurons and axons is reduced in depression, bipolar disorder, schizophrenia, and Alzheimer's disea... hiện toàn bộ
Immigration and hybridization patterns of yellow and anubis baboons in and around Amboseli, Kenya
American Journal of Primatology - Tập 53 Số 4 - Trang 139-154 - 2001
Susan C. Alberts, Jeanne Altmann
AbstractIn 1986, Samuels and Altmann reported evidence for a hybrid zone between Papio anubis and Papio cynocephalus in Amboseli, Kenya, in a baboon population that has been the subject of long‐term study since 1971 [Samuels & Altmann, International Journal of Primatology 7:131–138, 1986]. In the current report we document ongoing patterns of hybridization in Amboseli between anubis and yellow bab... hiện toàn bộ
Variation in fecal testosterone levels, inter‐male aggression, dominance rank and age during mating and post‐mating periods in wild adult male ring‐tailed lemurs (Lemur catta)
American Journal of Primatology - Tập 69 Số 12 - Trang 1325-1339 - 2007
Lisa Gould, Toni E. Ziegler
AbstractIn primate species exhibiting seasonal reproduction, patterns of testosterone excretion in adult males are variable: in some species, peaks correlate with female receptivity periods and heightened male–male aggression over access to estrous females, in others, neither heightened aggression nor marked elevations in testosterone have been noted. In this study, we examined mean fecal testoste... hiện toàn bộ
Coming of age: steroid hormones of wild immature baboons (Papio cynocephalus)
American Journal of Primatology - Tập 67 Số 1 - Trang 83-100 - 2005
Laurence R. Gesquiere, Jeanne Altmann, Memuna Z. Khan, Jannelle Couret, Jennifer C. Yu, Courtney S. Endres, Jessica W. Lynch, Patrick Ogola, Elizabeth A. Fox, Susan C. Alberts, Emmanuel O. Wango
AbstractLarge gaps exist in our knowledge about common patterns and variability in the endocrinology of immature nonhuman primates, and even normal hormonal profiles during that life stage are lacking for wild populations. In the present study we present steroid profiles for a wild population of baboons (Papio cynocephalus) from infancy through reproductive maturation, obtained by noninvasive feca... hiện toàn bộ
Urinary testosterone levels of wild male bonobos (Pan paniscus) in the Lomako Forest, Democratic Republic of Congo
American Journal of Primatology - Tập 65 Số 1 - Trang 87-92 - 2005
Andrew J. Marshall, Gottfried Hohmann
Female weight and reproductive condition in a population of olive baboons (Papio anubis)
American Journal of Primatology - Tập 12 Số 2 - Trang 189-195 - 1987
Fred B Beicovrtch
AbstractThe study reported here tested Altmann's prediction [Baboon Mothers and Infants. Cambridge, Harvard University Press, 1980] that lactating female baboons endure a weight loss. Data from 64 adult female olive baboons (Papio anubis) residing in six troops in Kenya revealed that reproductive condition was related to weight. Lactating females weighed less and pregnant females weighed more than... hiện toàn bộ
Brief repot: Interactions with infants by full siblings, paternal half‐siblings, and nonrelatives in a captive group of rhesus macaques (Macaca mulatta)
American Journal of Primatology - Tập 1 Số 1 - Trang 91-94 - 1981
Meredith F. Small, David Glenn Smith
AbstractSix mother‐infant pairs in a group of captive rhesus monkeys (Macaca mulatta) were observed for six months. “Infant grabs” by others and mothers' resistance to grabs were scored. More full siblings grabbed infants than either paternal half‐siblings or nonrelatives. Mothers resisted grabbing by more nonrelatives than by paternal half‐siblings. Although the maternal effect suggested by full ... hiện toàn bộ
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