Gladbach, David Joachim

[["dc.bibliographiccitation.firstpage","817"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Journal of Ornithology"],["dc.bibliographiccitation.lastpage","825"],["dc.bibliographiccitation.volume","151"],["dc.contributor.author","Gladbach, Anja"],["dc.contributor.author","Gladbach, David Joachim"],["dc.contributor.author","Quillfeldt, Petra"],["dc.date.accessioned","2018-11-07T08:38:38Z"],["dc.date.available","2018-11-07T08:38:38Z"],["dc.date.issued","2010"],["dc.description.abstract","Several studies have shown that waterfowl females in good condition lay larger clutches and start egg-laying earlier in a breeding season. However, most of these studies lack corresponding data on individual condition and timing of breeding in different years. We analysed data on clutch size, egg size, hatching date and female body condition of a non-migratory species, the Upland Goose Chloephaga picta leucoptera, recorded in three seasons on New Island, Falkand Islands. We found a strong seasonal decline in both egg and clutch size. Egg size increased with clutch size. The mean egg volume and total clutch volume increased with female body condition and hatching date was earlier for females in higher body condition. Chicks hatched from nests with higher mean egg volume had higher early body condition. We also compared individual females between different study years and found that individual body condition showed a significant repeatability between years, whereas hatching date did not. While female aging did not systematically affect hatching date, females produced clutches that hatched earlier in years of higher body condition. We could thus show for the first time that the frequently reported negative relationship between female condition and hatching date also holds true on an individual basis. To our knowledge, this is the first study on seasonal clutch size decline in sheldgeese and one of a few in waterfowl comparing condition and timing of breeding within individuals between different years."],["dc.identifier.doi","10.1007/s10336-010-0518-8"],["dc.identifier.isi","000281859400008"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/7660"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18808"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1439-0361"],["dc.relation.issn","0021-8375"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Seasonal clutch size decline and individual variation in the timing of breeding are related to female body condition in a non-migratory species, the Upland Goose Chloephaga picta leucoptera"],["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","243"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Ethology"],["dc.bibliographiccitation.lastpage","249"],["dc.bibliographiccitation.volume","29"],["dc.contributor.author","Gladbach, Anja"],["dc.contributor.author","Gladbach, David Joachim"],["dc.contributor.author","Quillfeldt, Petra"],["dc.date.accessioned","2018-11-07T08:56:46Z"],["dc.date.available","2018-11-07T08:56:46Z"],["dc.date.issued","2011"],["dc.description.abstract","In many bird species, achromatic plumage patch size can serve as a male status signal, but the use of variations in the achromatic colours themselves as a quality signal has only recently come into focus. In our study, we sought to determine whether achromatic plumage reflects individual quality in the upland goose (Chloephaga picta leucoptera). We examined the relationship between male head and wing reflectance, male condition and female reproductive investment. We found that males with darker specula and greater contrast between the white wing coverts and the speculum were in a better body condition. Variations in the brightness of the white plumage were not a quality signal in the upland goose. The information gleaned from the wing colouration of male upland geese could be used during mate selection, when females choose their mate on the basis of the outcomes of aggressive encounters. During these fights, the males expose their white coverts and their specula, which are normally tucked beneath body feathers."],["dc.identifier.doi","10.1007/s10164-010-0247-8"],["dc.identifier.isi","000289564800007"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6649"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23230"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1439-5444"],["dc.relation.issn","0289-0771"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Male achromatic wing colouration is related to body condition and female reproductive investment in a dichromatic species, the upland goose"],["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","1491"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Behavioral Ecology and Sociobiology"],["dc.bibliographiccitation.lastpage","1498"],["dc.bibliographiccitation.volume","65"],["dc.contributor.author","Gladbach, Anja"],["dc.contributor.author","Gladbach, David Joachim"],["dc.contributor.author","Koch, Martina"],["dc.contributor.author","Kuchar, Alexandra"],["dc.contributor.author","Moestl, Erich"],["dc.contributor.author","Quillfeldt, Petra"],["dc.date.accessioned","2018-11-07T08:54:44Z"],["dc.date.available","2018-11-07T08:54:44Z"],["dc.date.issued","2011"],["dc.description.abstract","The measurement of faecal glucocorticoid metabolites is used as a non-invasive technique to study stress in animal populations. They have been used most widely in mammals, and mammalian studies have also treated issues such as sample stability and storage methods. In birds, faecal corticosterone metabolite (CM) assays have been validated for a small number of species, and adequate storage under field conditions has not been addressed explicitly in previous studies. Furthermore, while it is well-established that baseline plasma corticosterone levels in birds rise with declining body condition, no study so far investigated if this relationship is also reflected in faecal samples. We here present data of a field study in wild Upland geese Chloephaga picta leucoptera on the Falkland Islands, testing different storage methods and investigating the relationship of faecal CM concentrations to body condition and reproductive parameters. We found that faecal CM measures are significantly repeatable within individuals, higher in individuals with lower body condition in both male and female wild Upland geese and higher in later breeding females with smaller broods. These results suggest that measuring faecal CM values may be a valuable non-invasive tool to monitor the relative condition or health of individuals and populations, especially in areas where there still is intense hunting practice."],["dc.identifier.doi","10.1007/s00265-011-1169-3"],["dc.identifier.isi","000291654000015"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/7308"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22738"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0340-5443"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Can faecal glucocorticoid metabolites be used to monitor body condition in wild Upland geese Chloephaga picta leucoptera?"],["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","1779"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Behavioral Ecology and Sociobiology"],["dc.bibliographiccitation.lastpage","1789"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Gladbach, Anja"],["dc.contributor.author","Gladbach, David Joachim"],["dc.contributor.author","Kempenaers, Bart"],["dc.contributor.author","Quillfeldt, Petra"],["dc.date.accessioned","2018-11-07T08:37:21Z"],["dc.date.available","2018-11-07T08:37:21Z"],["dc.date.issued","2010"],["dc.description.abstract","Although studies on the evolution and function of female ornaments have become more numerous in the last years, the majority of these studies were carried out in cases where female ornaments were a smaller and duller version of the ornaments found in males. There are substantially fewer studies on species with female-specific ornaments. However, no study so far investigated the potential of female-specific colouration as a quality signal in birds with conventional sex roles. We studied female-specific ornamentation in a strongly sexually dichromatic species, the upland goose Chloephaga picta leucoptera, in two consecutive years. Male upland geese have white head and breast feathers and black legs, whereas females have reddish-brown head and breast feathers and conspicuous yellow-orange legs. We found that female-specific colouration in upland geese can reliably indicate different aspects of female phenotypic quality. Females with more orange coloured legs and more red-like head colours had higher clutch and egg volumes than females with a paler leg and head colouration, and a more reddish plumage colouration was related to a higher body condition. These relationships provide the theoretic possibility for males to assess female phenotypic quality on the basis of colouration. Furthermore, the females with a more orange-like tarsus colouration had higher plasma carotenoid levels. Both tarsus colouration and carotenoid concentrations of individual females were highly correlated across years, indicating that tarsus colour is a stable signal. Despite this correlation, small individual differences in plasma carotenoid concentrations between the two study years were related to differences in tarsus colouration. We thus show for the first time in a wild bird and under natural conditions that carotenoid-based integument colouration remains consistent between individuals in consecutive years and is also a dynamic trait reflecting individual changes in carotenoid levels. In this species, where pairs form life-long bonds, the honesty of the carotenoid-based integument colouration suggests that it may be a sexually selected female ornament that has evolved through male mate choice."],["dc.identifier.doi","10.1007/s00265-010-0990-4"],["dc.identifier.isi","000282823800006"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/7661"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18512"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-0762"],["dc.relation.issn","0340-5443"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Female-specific colouration, carotenoids and reproductive investment in a dichromatic species, the upland goose Chloephaga picta leucoptera"],["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"]]