Relationships between the hard and soft dimensions of the nose in Pan troglodytes and Homo sapiens reveal the nasal protrusions of Plio-Pleistocene hominids

By identifying similarity in bone and soft tissue covariation patterns in hominids, it is possible to produce facial approximation methods that are compatible with more than one species of primate. In this study, we conducted an interspecific comparison of the nasomaxillary region in chimpanzees and modern humans with the aim of producing a method for predicting the nasal protrusions of ancient Plio-Pleistocene hominids. We addressed this aim by first collecting and performing regression analyses of linear and angular measurements of nasal cavity length and inclination in modern humans ( Homo sapiens; n = 72) and chimpanzees ( Pan troglodytes ; n = 19), and then by performing a set of out-of-group tests. The first test was performed on two subjects that belonged to the same genus as the training sample, i.e., Homo ( n = 1) and Pan ( n = 1), and the second test, which functioned as an interspecies compatibility test, was performed on Pan paniscus ( n = 1), Gorilla gorilla ( n = 3), Pongo pygmaeus ( n = 1), Pongo abelli ( n = 1), Symphalangus syndactylus ( n = 3), and Papio hamadryas ( n = 3). We identified statistically significant correlations in both humans and chimpanzees with slopes that displayed homogeneity of covariation. Joint prediction formulae were found to be compatible with humans and chimpanzees as well as all other African great apes, i.e., bonobos and gorillas. The main conclusion that can be drawn from this study is that regression models for approximating nasal projection are homogenous among humans and African apes and can thus be reasonably extended to ancestors leading to these clades.

Assessment of Human-Wildlife Conflict and the Attitude of Local Communities to Wild Animal Conservation around Borena Sayint National Park, Ethiopia

Human-wildlife conflict (HWC) has increased globally because of an increase in the human population, particularly in developing countries. This study was conducted to investigate the status of HWC and the attitude of local communities to wildlife conservation around Borena Sayint National Park, Northeastern Ethiopia. Data were collected between September 2017 and May 2018 using a face-to-face questionnaire survey (230), focus group discussions (7), and direct observation on the crop foraging. The data were analyzed using descriptive statistics, and the responses were compared using a nonparametric Pearson chi-square test. The majority of respondents (70%) reported the existence of HWC manifested because of the damage received to their assets (both crop and livestock). Canis aureus, Panthera pardus, Crocuta crocuta, and Papio hamadryas were stated as livestock depredators. Gelada, rabbit, porcupine, klipspringer, bushbuck, and duiker were considered as the major crop raiders. Over half (57.83%) of the respondents had a positive attitude, while others (36.09%) had a negative attitude towards the conservation of wildlife due to frequently faced problems. Respondents in different villages differed significantly (χ2 = 27.385, DF = 12, P < 0.05 ) in their attitude towards wildlife. Possible mitigation actions need to be undertaken to reduce the wildlife damage such that wildlife can sustainably be managed in the park.

Effect of Pregnancy and Age on Alopecia in Adult Female Baboons (Papio hamadryas spp)

Alopecia occurs frequently in captive populations of nonhuman primates. Because multiple factors can play a role in alopecia, a better understanding of its etiology will help identify potential welfare concerns. The purpose of this study was to investigate risk factors for alopecia in a breeding colony of baboons with a focus on pregnancy and age. Alopecia was scored on a scale of 0 (no alopecia) to 5 (severe alopecia) in 253 female baboons during routine physicals. The subjects ranged in age from 4 to 23 y (Mean = 9.6) and were categorized as pregnant (n = 83), nursing (n = 60) or control (n = 110). Resulting alopecia scores were combined into 2 categories (mild = 0 or 1; moderate = 2 or 3); no animals scored a 4 or 5. Significantly more pregnant females had moderate alopecia than did control females. There was no effect of age on alopecia. An unexpected outcome was that among nursing females, more of those with female infants had moderate alopecia than did those with male infants. The impact of the infant’s sex on alopecia may be due to sex differences in maternal contact or maternal investment. This information adds to our understanding of alopecia risk factors in captive nonhuman primates.