Publikationen

Associations between fecal glucocorticoid levels and social bonds vary with relatedness in juvenile rhesus macaques. 

Establishment and validation of fecal secretory immunoglobulin A measurement for intestinal mucosal health assessment in wild lemurs.

Linking energy availability, movement and sociality in a wild primate (Papio ursinus).

Chronic kidney disease and kidney stone in a wild chimpanzee (Pan troglodytes verus) in Côte D'Ivoire.

A non‐invasive measure of bone growth in mammals: Validating urinary CTX‐I as a bone resorption marker through long‐bone growth velocity in bonobos.

Multimodal sexual signals are not precise indicators of fertility in female Kinda baboons.

More allogrooming is followed by higher pyhsiological stress in wild female baboons.

The dynamics of sociality and glucocorticoids in wild Assamese macaques.

Behaviour and social bonds of African elephant calves under different holding systems in European zoos.

In vitro matured oocytes have a higher developmental potential than in vivo matured oocytes after hormonal ovarian stimulation in Callithrix jacchus.

Modulation of cell mediated immunity during pregnancy in wild bonobos.

Dental findings in wild great apes from mascerated skull analysis.

Average phenotype but not plasticity in two metabolic hormones co-vary in wild female bonobos (Pan paniscus).

Bekannte und unbekannte Auswirkungen der GnRH-Vakzine bei Elefanten.

Differences in mother-infant bond and social behavior of African elephant calves living in situ and ex situ.

Effects of tourism and researcher presence on fecal glucocorticoid metabolite levels in wild, habituated Sulawesi crested macaques (Macaca nigra).

Developmental and environmental modulation of fecal thyroid hormone levels in wild Assamese macaques (Macaca assamensis).

The long-term bacterial gut signature of a wild primate is associated with a timing effect of pre- and postnatal maternal glucocorticoid levels.

Neopterin levels in bonobos vary seasonally and reflect symptomatic respiratory infections.

Urinary cytokine measurements do not reflect surgery-induced inflammation in rhesus macaques.

Hormonal responses to mating competition in male Tonkean macaques.

Evidence for adolescent length growth spurts in bonobos and other primates highlights the importance of scaling laws.

The historical development of zoo elephant survivorship.

Long-term olfactory memory in African elephants.

Traces of dietary patterns in saliva of hominids: Profiling salivary aminoc acid fingerprints in great apes and humans.

Arbeitselefanten im Norden von Myanmar: tierärztliche Herausforderung, Probleme und Grenzen.

Assessing the drivers of gut microbiome composition in wild redfronted lemurs via longitudinal metacommunity analysis.

Transition to siblinghood causes substantial and long-lasting physiological stress reactions in wild bonobos.

Social correlates of androgens and dispersal age in juvenile male geladas.

Performance of marmoset monkeys as embryo donors is reflected by different stress-related parameters.

Plasma testosterone and androstenedione levels follow the same sex-specific patterns in the two Pan species

The use of alfaxalone for short-term anaesthesia can confound serum progesterone measurements in the common marmoset: a case report.

Blood testosterone levels in sickness and health: male chimpanzee testosterone levels decrease in face of an immune challenge.

Salivary cortisol reaction norms in zoo-housed great apes: diurnal slopes and intercepts as indicators of stress response quality.

Simultaneous investigation of urinary and fecal glucocorticoid metabolite concentrations reveals short- versus long-term drivers of HPA-axis activity in a wild primate (Papio ursinus).

Drivers of bacterial gut microbiome variation within and between groups of a wild Malagasy primate.

Testing the role of testosterone versus estrogens in mediating reproductive transitions in female rhesus macaques.

Effects of positive reinforcement training and novel object exposure on salivary cortisol levels under consideration of individual variation in captive African elephants (Loxodonta africana).

Responsiveness of fecal immunoglobulin A to HPA-axis activation limits its use for mucosal immunity assessment.

Social and sexual behaviors predict immune system activation, but not adrenocortical activation, in male rhesus macaques.

Maternal stress effects on infant development in wild Verreaux´s sifaka (Propithecus verreauxi).

Monitoring behaviour in African elephants during introduction into a new group: differences between related and unrelated animals.

The effect of reproductive state on activity budget, feeding behavior, and urinary C-peptide levels in wild female Assamese macaques.

Fecal glucocorticoids and gastrointestinal parasite infections in wild western lowland gorillas (Gorilla gorilla gorilla) involved in ecotourism.

Alternative reproductive strategies provide a flexible mechanism for assuring mating success in the European badgers (Meles meles): an investigation from hormonal measures.

Cell-mediated immune ontogeny is affected by sex but not environmental context in a long-lived primate species.

Triiodothyronine and cortisol levels in the face of energetic challenges from reproduction, thermoregulation and food intake in female macaques.

Urinary neopterin of wild chimpanzees at Ngogo, Kibale National Park, Uganda, indicates sex-biased cell-mediated immune activity and human-like senescence.

Time-lag of urinary and salivary cortisol response after a psychological stressor in bonobos (Pan paniscus).

Female ornaments: is red skin color attractive to males and related to condition in rhesus macaques?

Non-invasive assessment of metabolic responses to food restriction using urinary triiodothyronine and cortisol measurement in macaques.

Female fertile phase synchrony, and male mating and reproductive skew, in the crested macaque.

Generation and breeding of EGFP transgenic marmoset monkeys: Cell chimerism and implications for disease modelling.

Life on the edge: behavioural and physiological responses of Verreaux´s sifakas (Propithecus verreauxi) to forest edges.

Exploring the utility of hair endocannabinoids for monitoring homeostasis in bonobos.

The cost of association with males for Bornean and Sumatran female orangutans: a hidden form of sexual conflict?

Energetics at the urban edge: Environmental and individual predictors of urinary C-peptide levels in wild chacma baboons (Papio ursinus).

Patterns of urinary cortisol levels during ontogeny appear population- rather than species-specific in wild chimpanzees and bonobos.

Urinary cortisol increases during a respiratory outbreak in wild chimpanzees.

Testosterone and cortisol are negatively associated with ritualized bonding behavior in male macaques.

Dynamics and determinants of glucocorticoid metabolite concentrations in wild Verreaux´s sifakas.

Low rank and primiparity increase fecal glucocorticoid metabolites across gestation in wild geladas.

Diurnal variation of salivary cortisol in captive African elephants (Loxodonta africana) under routine management conditions and in relation to a translocation event.

Urinary suPAR: a non-invasive biomarker of infection and tissue inflammation for use in studies of large free-ranging mammals.

Energy balance but not competitive environment corresponds to allostatic load during development in an Old World monkey.

Collective action reduces androgen responsiveness with implications for shoaling dynamics in stickleback fish.

Altitude and human disturbance are associated with helminth diversity in an endangered primate, Procolobus gordonorum.

One size fits all? Relationship among group size, health, and ecology indicate a lack of an optimal group size in a wild lemur population.

Use of gonadotropin releasing hormone (GnRH) vaccines for behavioral and reproductive control in managed Asian elephant (Elephas maximus) and African elephant (Loxodonta africana) populations.

Measuring urinary cortisol and testosterone levels in male Barbary macaques: A comparison of EIA and LC-MS.

Exposure and susceptibility drive reinfection with gastrointestinal parasites in a social primate.

Physiological and social consequences of gastrointestinal nematode infection in a non-human primate.

Are human-dominated landscapes stressful for wild chimpanzees (Pan troglodytes)?

Cost of dispersal in a social mammal - body mass loss and increased stress.

The development of individual differences in cooperative behaviour: maternal glucocorticoid hormones alter helping behaviour of offspring in wild meerkats.

Subtypes of aggression and their relation to anxiety in Barbary macaques.

Developmental and family history-based analysis of congenital fused labia phenotype in the captive common marmoset (Callithrix jacchus).

Assessing female reproductive status of spectral tarsier (Tarsius tarsier) using fecal steroid hormone metabolite analysis.

Linking plasma sex steroid hormone levels to the condition of external genitalia in European badgers (Meles meles): A critical evaluation of traditional field methodology.

Do sexual calls in female black capuchin monkeys (Sapajus nigritus) vary with fertility? An acoustic analysis.

Prolonged luteal lifespan and pseudopregnancy in Asian elephants (Elephas maximus).

Male resource defense mating system in primates? An experimental test in wild capuchin monkeys.

Comparison of fecal preservation and extraction methods for steroid hormone metabolite analysis in wild crested macaques.

A retrospective analysis of adverse effects of an in vivo fluoroquinolone antibiotic enrofloxacin treatment on oocyte quality in the common marmoset.

Stress impact on the gut microbiome of free-ranging lowland gorillas.

Prenatal stress accelerates offspring growth to compensate for reduced maternal investment across mammals.

The influence of stress hormones and aggression on cooperative behaviour in subordinate meerkats.

Feeling anxious? The mechanisms of vocal deception in tufted capuchin monkeys.

Repeated freeze-thaw cycles but not short-term storage of fecal extracts at ambient temperature influence the stability of steroid hormone metabolite levels in crested macaques.

Group size and visitor numbers predict faecal glucocorticoid concentrations in zoo meerkats.

Meerkat close calling patterns are linked to sex, social category, season and wind, but not fecal glucocorticoid metabolite concentrations.

Validation of a field-friendly extraction and storage method to monitor fecal steroid metabolites in wild orangutans.

Age, but not anthelmintic treatment, is associated with urinary neopterin levels in semi-free ranging Barbary macaques.

Is social dispersal stressful? A study in male crested macaques (Macaca nigra).

Prenatal stress effects in a wild, long-lived primate: predictive adaptive responses in an unpredictable environment.

Cortisol coregulation in fish.

Validation of a fecal glucocorticoid assay to assess adrenocortical activity in meerkats using physiological and biological stimuli.

Tailored enrichment strategies and stereotypic behavior in captive individually-housed macaques (Macaca spp.).

Long-term oocyte-like cell development in cultures derived from neonatal marmoset monkey ovary.

Post Partum Ovulation bei Elefanten (Elephas maximus und Loxodonta africana) in Europa (2016). In: Steinmetzt H (ed): 35. Arbeitstagung der Zootierärzte im deutschsprachigen Raum.

Urinary neopterin, a non-invasive marker of mammalian cellular immune activation, is highly stable under field conditions. 

Evaluating non-invasive markers of non-human primate immune activation and inflammation.

Validation of a novel collection device for non-invasive urine sampling from free-ranging animals.

Endocrinological correlates of male bimaturism in wild Bornean orangutans.

Social behavior and patterns of testosterone and glucocorticoid levels differ between male chacma and Guinea baboons.

Female behavioral proceptivity functions as a probabilistic signal of female fertility, not female quality, in a New World primate.

The stress of growing old: sex- and season-specific effects on allostatic load in wild grey mouse lemurs.

20 Jahre endokrinologischer Elefantenservice - Bedeutung für Zoos und Europäische Erhaltungszuchtprogramme (EEPs).

Personality, plasticity, and predation: linking endocrine and behavioural reaction norms in stickleback fish.

Body weight-associated differences in ovarian morphology in captive common marmoset (Callithrix jacchus).

Visible implant elastomer (VIE) tagging and simulated predation elicit similar physiological stress responses in three-spined stickleback Gasterosteus aculeatus.

Physiological stress levels in the endemic and endangered Udzungwa red colobus vary with elevation.

Critical estradiol dose optimization for oocyte in vitro maturation in the common marmoset.

Androgen correlates of male reproductive effort in wild male long-tailed macaques (Macaca fascicularis): A multi-level test of the challenge hypothesis.

Responses to social and environmental stress are attenuated by strong male bonds in wild macaques.

Behavioral and physiological responses to fruit availability of spider monkeys ranging in a small forest fragment.

Physiological and behavioural responses to weaning conflict in free-ranging primate infants.

Costs of mate-guarding in wild male long-tailed macaques (Macaca fascicularis): Physiological stress and aggression.

Habitat degradation and seasonality affect physiological stress levels of Eulemur collaris in littoral forest fragments.

Low female stress hormone levels are predicted by same- or opposite-sex sociality depending on season in wild Assamese macaques.

Costs of and investment in mate-guarding in wild long-tailed macaques: influences of female characteristics and male-female social bonds.

Lack of evidence for energetic costs of mate-guarding in wild male Assamese macaques (Macaca assamensis).

Competition-induced stress does not explain deceptive alarm calling in tufted capuchin monkeys.

The effect of fission-fuison zoo housing on hormonal and behavioral indicators of stress in Bornean orangutans (Pongo pygmaeus).

Effects of habituation, research and ecotourism on faecal glucocorticoid metabolites in western lowland gorillas: Implications for conservation management.

Mate-guarding constrains feeding activity but not energetic status of wild male long-tailed macaques (Macaca fascicularis).

Evaluating capture stress in wild gray mouse lemurs via repeated fecal sampling: method validation and the influence of prior experience and handling protocols on stress responses.

Cues to androgen and quality in male gibbon songs.

Effects of logging, hunting, and forest fragment size on physiological stress levels of two sympatric ateline primates in Colombia.

Methodological considerations in the analysis of fecal glucocorticoid metabolites in tufted capuchin monkeys (Cebus apella).

Extra-pair paternity confirmed in wild white-handed gibbons.

Signalling in multiple modalities in male rhesus macaques: sex skin coloration and barks in relation to androgen levels, social status and mating behavior.

Physiological stress hormone levels and mating behaviour are negatively correlated in male rhesus macaques (Macaca mulatta).

Validation of an enzymeimmunoassay for assessing adrenocortical activity and evaluation of factors that affect levels of fecal glucocorticoid metabolites in two New World primates.

Long-term storage effects in steroid metabolite extracts from baboon (Papio sp.) faeces - a comparison of three commonly applied storage methods.

Female fecal androgens prior to the mating season reflect readiness to conceive in reproductively quiescent wild macaques.

Effects of social status and stress on patterns of gastrointestinal parasitism in wild white-handed gibbons (Hylobates lar).

The endocrinology of male rhesus macaque social and reproductive status: a test of the challenge and social stress hypotheses.

Male mating behavior in relation to female sexual swellings, socio-sexual behavior and hormonal changes in wild Barbary macaques.

Non-invasive monitoring of physiological stress in the western lowland gorilla (Gorilla gorilla gorilla): Validation of a faecal glucocorticoid assay and methods for practical application in the field.

Do males time their mate-guarding effort with the fertile phase in order to secure fertilisation in Cayo Santiago rhesus macaques?

Fecal androgen excretion and fetal sex effects during gestation in wild Assamese macaques (Macaca assamensis).

Information content of female copulation calls in wild long-tailed macaques (Macaca fascicularis).

Minimally invasive transabdominal collection of preimplantation embryos from the common marmoset monkey (Callithrix jacchus).

Developmental expression of the pluripotency factor Sal-Like Protein 4 in the monkey, human and mouse testis: restriction to premeiotic germ cells.

Sexual signalling in female crested macaques.

Sociodemographic correlates of fecal androgen levels in wild male white-handed gibbons (Hylobates lar).

Field endocrinology: monitoring hormonal changes in free-ranging primates. In: Setchell J, Curtis D (eds): Field and laboratory methods in primatology, A practical guide.

Species-specific patterns in fecal glucocorticoid and androgen levels in zoo-living orangutans (Pongo spp.).

Urinary C-peptide of insulin as a non-invasive marker of nutritional status: some practicalities.

Estrogen and progestogen correlates of the structure of female copulation calls in semi-free-ranging Barbary macaques (Macaca sylvanus).

The energetics of male-male endurance rivalry in rhesus macaques.

Male competition and its hormonal correlates in Assamese macaques (Macaca assamensis).

Do women´s voices provide cues of the likelihood of ovulation? The importance of sampling regime.

Infant bystanders modulate the influence of ovarian hormones on female socio-sexual behaviour in free-ranging rhesus macaques.

Fecal glucocorticoid measurements and their relation to rearing, behaviour and environmental factors in the pileated gibbon population (Hylobates pileatus) held in European zoos.

Upper respiratory tract disease in captive orangutans (Pongo sp.): prevalence in 20 European zoos and predisposing factors.

Testing the Priority-of-Access model in a seasonally breeding primate species.

The social correlates of self-directed behaviour and faecal glucocorticoid levels among adult male olive baboons (Papio hamadryas anubis) in Gashaka Gumti National Park, Nigeria.

Immune function and HPA axis activity in free-ranging rhesus macaques.

Impacts of tourism on anxiety and physiological stress levels in wild male Barbary macaques.

Familiarity affects the assessment of female facial signals of fertility by free-ranging male rhesus macaques.

You mate, I mate: Macaque females synchronize sex not cycles.

Urinary c-peptide measurement as a marker of nutritional status in macaques.

Concealed fertility and extended female sexuality in a non-human primate (Macaca assamensis).

Social capital and physiological stress levels in free-ranging adult female rhesus macaques.

Host intrinsic determinants and potential consequences of parasite infection in free-ranging red-fronted lemurs (Eulemur fulvus rufus).

Endocrine correlates of musth and the impact of ecological and social factors in free-ranging African elephants (Loxodonta africana).

Infants as costly social tools in male Barbary macaque networks.

Color signal information content and the eye of the beholder: a case study in the rhesus macaque.

Reproductive and life history parameters of wild female Macaca assamensis.

Endocrine monitoring of reproduction and stress. In: Kleiman D, Thompson KV, Baer CK (eds): Wild mammals in captivity: Principles and techniques for zoo management.

Non-invasive monitoring of endocrine status in laboratory primates: methods, guidelines and applications.

Female reproductive signaling, and male mating behavior, in the olive baboon.

Mate-guarding as a male reproductive tactic in Propithecus verreauxi.

Signals of female reproductive quality and fertility in colony-living baboons (Papio h. anubis) in relation to ensuring paternal investment.

Monitoring female reproductive status in white-handed gibbons (Hylobates lar) using fecal hormone analysis and patterns of genital skin swellings. In: Lappan S, Whittaker D, Geissmann T (eds): The gibbons: New perspectives on small ape socioecology and population biology.

Seasonal and social influences on fecal androgen and glucocorticoid excretion in wild male long-tailed macaques (Macaca fascicularis).

Sexual skin color contains information about the timing of the fertile phase in free-ranging Macaca mulatta.

Rates of self-directed behaviour and faecal glucocorticoid levels are not correlated in female wild olive baboons (Papio hamadryas anubis).

Individual facial coloration in male Eulemur fulvus rufus: A condition-dependent ornament?

Seasonal and inter-individual variation in testosterone levels in badgers (Meles meles): evidence for the existence of two endocrinological phenotypes.

Female ovarian cycle phase affects the timing of male sexual activity in free-ranging Barbary macaques (Macaca sylvanus) of Gibraltar.

Dominance, aggression and physiological stress in wild male Assamese macaques (Macaca assamensis).

Female Barbary macaque (Macaca sylvanus) copulation calls do not reveal the fertile phase but influence mating outcome.

Androgen and glucocorticoid levels reflect seasonally occurring social challenges in male redfronted lemurs (Eulemur fulvus rufus).

Mating patterns and sexual swellings in pair-living and multimale groups of wild white-handed gibbons, Hylobates lar.

Baboon sexual swellings: information content of size and color.

Urinary glucocorticoid levels in relation to socio-behavioral and reproductive parameters in captive-housed male chimpanzees

Female white-handed gibbons (Hylobates lar) lead group movements and have priority of access to food resources.

Sex-specific reproductive behaviours and paternity in free-ranging Barbary macaques (Macaca sylvanus).

Male Barbary macaques eavesdrop on mating outcome: a playback study.

The timing of ovulation with respect to sexual swelling detumescence in wild olive baboons.

Monitoreo no-invasivo de animales silvestres - análisis genéticos y endocrinológicos a base de muestras fecales en 'pichicos barba blanca' (Saguinus mystax, Callitrichidae, Primates) en la Estación Biológica Quebrada Blanco (EBQB), Perú. In: Bodmer RE, Puertas P (eds): Memoria VI Congreso sobre Manejo de Fauna silvestre en Amazonia y Latinoamerica. Iquitos.

Post-conception mating in wild long-tailed macaques (Macaca fascicularis): characterization, endocrine correlates and functional significance.

Sexual swellings in wild white-handed gibbon females (Hylobates lar) indicate the probability of ovulation.

Influence of reproductive season and rank on fecal glucocorticoid levels in free-ranging male Verreaux´s sifakas (Propithecus verreauxi).

Female sexual behavior and sexual swelling size as potential cues for males to discern the female fertile phase in free-ranging Barbary macaques (Macaca sylvanus) of Gibraltar.

Grooming in Barbary macaques: better to give than to receive?

The impact of ecological variability on the reproductive endocrinology of wild female African elephants.

Reduced reproductive function in wild baboons (Papio hamadryas anubis) related to natural consumption of the African black plum (Vitex doniana).

A case study: Fecal corticosteroid and behavior as indicators of welfare during relocation of an Asian elephant.

Determinants of male reproductive success in wild long-tailed macaques (Macaca fascicularis) – male monopolisation, female mate choice or post-copulatory mechanisms?

Coat condition, housing condition and measurement of faecal cortisol metabolites – A non-invasive study about alopecia in captive rhesus macaques (Macaca mulatta).

Comparison of different enzymeimmunoassays for assessment of adrenocortical activity in primates based on fecal analysis.

Effects of human pituitary FSH isoforms on mouse follicles in vitro.

Reproductive cycles and mating patterns in female Barbary macaques. In: Hodges JK, Cortes J (eds): The Barbary Macaque: Biology, Management and Conservation.

The sexually active states of free-ranging male African elephants (Loxodonta africana): Defining musth and non-musth using endocrinology, physical signals and behaviour.

Female sexual behavior, but not sex skin swelling, reliably indicates the timing of the fertile phase in wild long-tailed macaques (Macaca fascicularis).

Physical, physiological and behavioural correlates of musth in captive African elephants (Loxodonta africana).

Patterns of anogenital swelling size and their endocrine correlates during ovulatory cycles and early pregnancy in free-ranging Barbary macaques (Macaca sylvanus) of Gibraltar.

Certain aspects of Bonobo female sexual repertoire are related to urinary testosterone metabolite levels.

Characterization and social correlates of fecal testosterone and cortisol excretion in wild male Saguinus mystax

Male dominance rank, female mate choice and male mating and reproductive success in captive chimpanzees (Pan troglodytes).

A pair choice test to identify female mating pattern relative to ovulation in longtailed macaques (Macaca fascicularis).