Kraus, Cornelia

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","BMC Evolutionary Biology"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Eckhardt, Falk"],["dc.contributor.author","Pauliny, Angela"],["dc.contributor.author","Rollings, Nicky"],["dc.contributor.author","Mutschmann, Frank"],["dc.contributor.author","Olsson, Mats"],["dc.contributor.author","Kraus, Cornelia"],["dc.contributor.author","Kappeler, Peter M."],["dc.date.accessioned","2021-04-14T08:32:23Z"],["dc.date.available","2021-04-14T08:32:23Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1186/s12862-020-01724-2"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17689"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/83903"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.notes.intern","Merged from goescholar"],["dc.relation.eissn","1471-2148"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Stress-related changes in leukocyte profiles and telomere shortening in the shortest-lived tetrapod, Furcifer labordi"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","cow034"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Conservation Physiology"],["dc.bibliographiccitation.volume","4"],["dc.contributor.author","Rakotoniaina, Josué H."],["dc.contributor.author","Kappeler, Peter"],["dc.contributor.author","Ravoniarimbinina, Pascaline"],["dc.contributor.author","Pechouskova, Eva"],["dc.contributor.author","Hämäläinen, Anni"],["dc.contributor.author","Grass, Juliane"],["dc.contributor.author","Kirschbaum, Clemens"],["dc.contributor.author","Kraus, Cornelia"],["dc.date.accessioned","2017-09-07T11:48:23Z"],["dc.date.available","2017-09-07T11:48:23Z"],["dc.date.issued","2016"],["dc.description.abstract","Understanding how animals react to human-induced changes in their environment is a key question in conservation biology. Owing to their potential correlation with fitness, several physiological parameters are commonly used to assess the effect of habitat disturbance on animals' general health status. Here, we studied how two lemur species, the fat-tailed dwarf lemur (Cheirogaleus medius) and the grey mouse lemur (Microcebus murinus), respond to changing environmental conditions by comparing their stress levels (measured as hair cortisol concentration), parasitism and general body condition across four habitats ordered along a gradient of human disturbance at Kirindy Forest, Western Madagascar. These two species previously revealed contrasting responses to human disturbance; whereas M. murinus is known as a resilient species, C. medius is rarely encountered in highly disturbed habitats. However, neither hair cortisol concentrations nor parasitism patterns (prevalence, parasite species richness and rate of multiple infections) and body condition varied across the gradient of anthropogenic disturbance. Our results indicate that the effect of anthropogenic activities at Kirindy Forest is not reflected in the general health status of both species, which may have developed a range of behavioural adaptations to deal with suboptimal conditions. Nonetheless, a difference in relative density among sites suggests that the carrying capacity of disturbed habitat is lower, and both species respond differently to environmental changes, with C. medius being more negatively affected. Thus, even for behaviourally flexible species, extended habitat deterioration could hamper long-term viability of populations."],["dc.identifier.doi","10.1093/conphys/cow034"],["dc.identifier.gro","3150807"],["dc.identifier.pmid","27656285"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13781"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7599"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.relation.issn","2051-1434"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject","Body condition; Madagascar; habitat disturbance; lemurs; parasitism; stress"],["dc.title","Does habitat disturbance affect stress, body condition and parasitism in two sympatric lemurs?"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","30"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","BMC Ecology"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Rakotoniaina, Josué H"],["dc.contributor.author","Kappeler, Peter M"],["dc.contributor.author","Kaesler, Eva"],["dc.contributor.author","Hämäläinen, Anni M"],["dc.contributor.author","Kirschbaum, Clemens"],["dc.contributor.author","Kraus, Cornelia"],["dc.date.accessioned","2019-07-10T08:12:10Z"],["dc.date.available","2019-07-10T08:12:10Z"],["dc.date.issued","2017-09-01"],["dc.description.abstract","Abstract Background Glucocorticoid hormones are known to play a key role in mediating a cascade of physiological responses to social and ecological stressors and can therefore influence animals’ behaviour and ultimately fitness. Yet, how glucocorticoid levels are associated with reproductive success or survival in a natural setting has received little empirical attention so far. Here, we examined links between survival and levels of glucocorticoid in a small, short-lived primate, the grey mouse lemur (Microcebus murinus), using for the first time an indicator of long-term stress load (hair cortisol concentration). Using a capture-mark-recapture modelling approach, we assessed the effect of stress on survival in a broad context (semi-annual rates), but also under a specific period of high energetic demands during the reproductive season. We further assessed the power of other commonly used health indicators (body condition and parasitism) in predicting survival outcomes relative to the effect of long-term stress. Results We found that high levels of hair cortisol were associated with reduced survival probabilities both at the semi-annual scale and over the reproductive season. Additionally, very good body condition (measured as scaled mass index) was related to increased survival at the semi-annual scale, but not during the breeding season. In contrast, variation in parasitism failed to predict survival. Conclusion Altogether, our results indicate that long-term increased glucocorticoid levels can be related to survival and hence population dynamics, and suggest differential strength of selection acting on glucocorticoids, body condition, and parasite infection."],["dc.identifier.doi","10.1186/s12898-017-0140-1"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/15131"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60879"],["dc.notes.intern","Merged from goescholar"],["dc.notes.intern","In goescholar not merged with http://resolver.sub.uni-goettingen.de/purl?gs-1/14688 but duplicate"],["dc.publisher","BioMed Central"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Hair cortisol concentrations correlate negatively with survival in a wild primate population"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","231"],["dc.bibliographiccitation.journal","International Journal for Parasitology: Parasites and Wildlife"],["dc.bibliographiccitation.lastpage","240"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Eckhardt, Falk"],["dc.contributor.author","Strube, Christina"],["dc.contributor.author","Mathes, Karina A."],["dc.contributor.author","Mutschmann, Frank"],["dc.contributor.author","Thiesler, Hauke"],["dc.contributor.author","Kraus, Cornelia"],["dc.contributor.author","Kappeler, Peter M."],["dc.date.accessioned","2020-12-10T14:24:38Z"],["dc.date.available","2020-12-10T14:24:38Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1016/j.ijppaw.2019.09.010"],["dc.identifier.issn","2213-2244"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17079"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/72312"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.intern","Merged from goescholar"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Parasite burden in a short-lived chameleon, Furcifer labordi"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","11397"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Eckhardt, Falk"],["dc.contributor.author","Kappeler, Peter M."],["dc.contributor.author","Kraus, Cornelia"],["dc.date.accessioned","2018-02-12T08:46:15Z"],["dc.date.available","2018-02-12T08:46:15Z"],["dc.date.issued","2017"],["dc.description.abstract","Among tetrapods, the current record holder for shortest lifespan is Labord's chameleon, Furcifer labordi. These reptiles from the arid southwest of Madagascar have a reported lifespan of 4-5 months during the annual rainy season and spend the majority of their life (8-9 months) as a developing embryo. This semelparous, annual life history is unique among tetrapods, but only one population (Ranobe) in the southernmost distribution range has been studied. We therefore investigated the potential for environmentally-dependent variability in lifespan in a population in Kirindy Forest, which has a much longer warm rainy season. While no adults were found after March in Ranobe, the disappearance of adults was delayed by several months in Kirindy. Our data also revealed sex-biased mortality, suggesting that females have a longevity advantage. Furthermore, we found that, after an unusually long previous rainy season, one female was capable of surviving until a second breeding season. Keeping F. labordi in cages under ambient conditions demonstrated that also males can also survive until the next season of activity under these conditions. Our study therefore revealed considerable variability in the extreme life history of this tetrapod that is linked to variation in ecological factors."],["dc.identifier.doi","10.1038/s41598-017-11701-3"],["dc.identifier.pmid","28900276"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16497"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12107"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","final"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Highly variable lifespan in an annual reptile, Labord’s chameleon (Furcifer labordi)"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","25"],["dc.bibliographiccitation.journal","Frontiers in Zoology"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Haemaelaeinen, Anni"],["dc.contributor.author","Raharivololona, Brigitte"],["dc.contributor.author","Ravoniarimbinina, Pascaline"],["dc.contributor.author","Kraus, Cornelia"],["dc.date.accessioned","2018-11-07T09:51:02Z"],["dc.date.available","2018-11-07T09:51:02Z"],["dc.date.issued","2015"],["dc.description.abstract","Introduction: Immunosenescence (deteriorating immune function at old age) affects humans and laboratory animals, but little is known about immunosenescence in natural populations despite its potential importance for population and disease dynamics and individual fitness. Although life histories and immune system profiles often differ between the sexes, sex-specific effects of aging on health are rarely studied in the wild. Life history theory predicts that due to their shorter lifespan and higher investment into reproduction at the expense of immune defences, males might experience accelerated immunosenescence. We tested this hypothesis by examining sex-specific age trajectories of endoparasite burden (helminth prevalence and morphotype richness measured via fecal egg counts), an indicator of overall health, in wild gray mouse lemurs (Microcebus murinus). To account for potential interactions between seasonality and host sex or age we examined the predictors of parasite burdens separately for the dry and rainy season. Results: Contrary to the prediction of immunosenescence, parasite prevalence and morphotype richness decreased at old age in the dry season, indicating acquired immunity by older animals. This pattern was primarily caused by within-individual decline in parasite loads rather than the earlier mortality of highly parasitized individuals. With the exception of an increasing cestode prevalence in males from yearlings to prime age in the rainy season, no evidence was found of male-biased ageing in parasite resistance. Besides this sex age interaction, host age was uncorrelated with rainy season parasite loads. Seasonality did not affect the overall parasite loads but seasonal patterns were found in the predictors of parasite prevalence and morphotype richness. Conclusions: These results provide rare information about the age-related patterns of health in a wild vertebrate population and suggest improvement rather than senescence in the ability to resist helminth infections at old age. Overall, males appear not to suffer from earlier immunosenescence relative to females. This may partially reflect the earlier mortality of males, which can render senescence difficult to detect. While helminth infections are not strongly associated with survival in wild gray mouse lemurs, parasite load may, however, reflect overall good phenotypic quality of long-lived individuals, and is a potential correlate of fitness."],["dc.description.sponsorship","DFG [KR3834/1-1]"],["dc.identifier.doi","10.1186/s12983-015-0118-9"],["dc.identifier.isi","000362068700002"],["dc.identifier.pmid","26435728"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12724"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35831"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Biomed Central Ltd"],["dc.relation.issn","1742-9994"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Host sex and age influence endoparasite burdens in the gray mouse lemur"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","68"],["dc.bibliographiccitation.journal","General and Comparative Endocrinology"],["dc.bibliographiccitation.lastpage","79"],["dc.bibliographiccitation.volume","195"],["dc.contributor.author","Haemaelaeinen, Anni"],["dc.contributor.author","Heistermann, Michael"],["dc.contributor.author","Fenosoa, Zo Samuel Ella"],["dc.contributor.author","Kraus, Cornelia"],["dc.date.accessioned","2018-11-07T09:46:48Z"],["dc.date.available","2018-11-07T09:46:48Z"],["dc.date.issued","2014"],["dc.description.abstract","Reliable measurements of physiological stress are increasingly needed for eco-physiological research and for species conservation or management. Stress can be estimated by quantifying plasma glucocorticoid levels, but when this is not feasible, glucocorticoid metabolites are often measured from feces (FGCM). However, evidence is accumulating on the sensitivity of FGCM measurements to various nuisance factors. Careful species- and context-specific validations are therefore necessary to confirm the biological relevance and specificity of the method. The goals of this study were to: (1) establish and validate sampling methods and an enzymeimmunoassay to measure FGCM in the gray mouse lemur (Microcebus murinus); (2) explore causes of variability in the FGCM measurements, and; (3) assess the consequences of capturing and handling for free-living individuals by quantifying their stress responses via repeated fecal sampling within capture sessions. We further assessed the influence of different handling protocols and the animals' previous capture experience on the magnitude of the physiological response. Our validations identified the group-specific measurement of 11 beta-hydroxyetiocholanolone as the most suitable assay for monitoring adrenocortical activity. The sample water content and the animal's age were found to significantly influence baseline FGCM-levels. Most captured animals exhibited a post-capture FGCMelevation but its magnitude was not related to the handling protocol or capture experience. We found no evidence for long-term consequences of routine capturing on the animals' stress physiology. Hence the described methods can be employed to measure physiological stress in mouse lemurs in an effective and relatively non-invasive way. (C) 2013 The Authors. Published by Elsevier Inc. All rights reserved."],["dc.description.sponsorship","DFG [KR3834/1-1]"],["dc.identifier.doi","10.1016/j.ygcen.2013.10.017"],["dc.identifier.isi","000330257100008"],["dc.identifier.pmid","24212051"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11364"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34965"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Academic Press Inc Elsevier Science"],["dc.relation.issn","1095-6840"],["dc.relation.issn","0016-6480"],["dc.rights","CC BY-NC-SA 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by-nc-sa/3.0"],["dc.title","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"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]