Publications

assessment of environmental enrichment for different primate species under low budget: a case study.	the 2011 european union zoo inquiry presented evidence that most zoos fail to achieve adequate levels of nonhuman animal welfare. appropriate environmental enrichment (ee) can play a role in the promotion of welfare. however, financial and staff constraints frequently make it challenging to implement ee on a daily basis. the aim of this study was to test how individuals of three different nonhuman primate species at the maia zoo in portugal (white-handed gibbons, hylobates lar; mona monkeys, cer ...	2018	29299937
intestinal parasites and the occurrence of zoonotic giardia duodenalis genotype in captive gibbons at krabokkoo wildlife breeding center, thailand.	intestinal parasitic infections can have an impact on health and growth of wildlife. the current study aims were to determine the prevalence of intestinal parasites and to molecular characterize giardia duodenalis and cryptosporidium spp. in captive gibbons at krabokkoo wildlife breeding center, thailand. fifty-five gibbons, 2 agile- (hylobates agilis), 38 lar- (hylobates lar) and 15 pileated gibbons (hylobates pileatus) were included in this study. fecal samples were collected individually at k ...	2019	31106211
infant loss during and after male replacement in gibbons.	according to the sexual selection hypothesis, infanticide during resident male replacement is an adaptive strategy that has evolved because the killing of unweaned offspring sired by previous males shortens the inter-birth intervals of the mothers whose infants are targeted and thereby increases the reproductive fitness of the perpetrator. to test this hypothesis, we describe previously unreported cases of primary male replacement for two gibbon species (hylobates lar and nomascus nasutus), and ...	2019	31338860
the distribution, number, and certain neurochemical identities of infracortical white matter neurons in a lar gibbon (hylobates lar) brain.	we examined the number, distribution, and immunoreactivity of the infracortical white matter neuronal population, also termed white matter interstitial cells (wmics), in the brain of a lesser ape, the lar gibbon. staining for neuronal nuclear marker (neun) revealed wmics throughout the infracortical white matter, these cells being most numerous and dense close to cortical layer vi, decreasing significantly in density with depth in the white matter. stereological analysis of neun-immunopositive c ...	2019	30378128
the body center of mass in primates: is it more caudal than in other quadrupedal mammals?	whole body center of mass (bcom) position values are lacking for a comparative sample of primates. therefore, it still remains unknown whether the bcom in primates is more posteriorly located than in other mammals. the aim of the present report is to provide data for a large sample of primate species and to compare the position of the bcom in primates to non-primate mammals.	2019	30839107
mandibular shape variation in mainland and insular hylobatids.	although hylobatids are the most speciose of the living apes, their morphological interspecies and intraspecies variation remains poorly understood. here, we assess mandibular shape variation in two species of hylobates, white-handed (hylobates lar) and black-handed (hylobates agilis) gibbons. using 71 three-dimensional landmarks to quantify mandibular shape, interspecies and intraspecies variation and geographic patterns of mandibular shape are examined in a mixed sex sample of adult h. lar and ...	2020	32696564
are social media reports useful for assessing small ape occurrence? a pilot study from peninsular malaysia.	citizen science-based research has been used effectively to estimate animal abundance and breeding patterns, to monitor animal movement, and for biodiversity conservation and education. here, we evaluate the feasibility of using social media observations to assess the distribution of small apes in peninsular malaysia. we searched for reports of small ape observations in peninsular malaysia on social media (e.g., blogs, facebook, instagram, twitter, youtube, inaturalist, etc.), and also used onli ...	2020	32083333
clonal spread of yersinia enterocolitica 1b/o:8 in multiple zoo species.	yersinia enterocolitica (ye) bioserotype 1b/o:8 (ye 1b/o:8) was identified in routine culture of a variety of zoo species housed at omaha's henry doorly zoo and aquarium (ohdza) from april to july 2011. animal cases representing 12 species had ye detected from 34 cases during routine fecal monitoring and/or during postmortem examination: coquerel's sifakas (propithecus coquereli, two cases), black & white (bw) ruffed lemurs (varecia variegata variegata, six cases), red ruffed lemurs (varecia rub ...	2020	32212560
the forearm and hand musculature of semi-terrestrial rhesus macaques (macaca mulatta) and arboreal gibbons (fam. hylobatidae). part ii. quantitative analysis.	nonhuman primates have a highly diverse locomotor repertoire defined by an equally diverse hand use. based on how primates use their hands during locomotion, we can distinguish between terrestrial and arboreal taxa. the 'arboreal' hand is likely adapted towards high wrist mobility and grasping, whereas the 'terrestrial' hand will show adaptations to loading. while the morphology of the forearm and hand bones have been studied extensively, functional adaptations in the forearm and hand musculatur ...	2020	33011967
the forearm and hand musculature of semi-terrestrial rhesus macaques (macaca mulatta) and arboreal gibbons (fam. hylobatidae). part i. description and comparison of the muscle configuration.	primates live in very diverse environments and, as a consequence, show an equally diverse locomotor behaviour. during locomotion, the primate hand interacts with the superstrate and/or substrate and will therefore probably show adaptive signals linked with this locomotor behaviour. whereas the morphology of the forearm and hand bones have been studied extensively, the functional adaptations in the hand musculature have been documented only scarcely. to evaluate whether there are potential adapta ...	2020	32511764
white-handed gibbons (hylobates lar) alter ranging patterns in response to habitat type.	small apes are often characterized as inhabiting small home ranges and being dependent on evergreen forest due to their dietary specialization on ripe fruits. yet few primate studies, particularly those with gibbons, have considered intraspecific variations in ranging behaviors in response to local ecological conditions. this study examines endangered white-handed gibbon (hylobates lar) ranging patterns in a heterogeneous landscape. we conducted 13 months of behavioral observations on four white ...	2020	32880766
white-handed gibbons discriminate context-specific song compositions.	white-handed gibbons produce loud and acoustically complex songs when interacting with their neighbours or when encountering predators. in both contexts, songs are assembled from a small number of units although their composition differs in context-specific ways. here, we investigated whether wild gibbons could infer the 'meaning' when hearing exemplars recorded in both contexts (i.e. 'duet songs' vs. 'predator songs'). we carried out a playback experiment by which we simulated the presence of a ...	2020	32832260
acute human orthopneumovirus infection in a captive white-handed gibbon.	we report herein a fatal case of acute human orthopneumovirus (formerly respiratory syncytial virus) infection in a captive white-handed gibbon (hylobates lar). other members of the housing group had mild respiratory signs. gross examination revealed bilateral pulmonary congestion and froth in the bronchi. microscopically, the lungs had lymphocytic, neutrophilic infiltration of the interstitium and alveolar walls. there was necrosis of terminal bronchiolar epithelium and terminal bronchioles, an ...	2020	32167415