Anja Gladbach

Anja Gladbach

Leverkusen, Nordrhein-Westfalen, Deutschland
700 Follower:innen 500+ Kontakte

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Berufserfahrung

  • Bayer Grafik

    Bayer

    Monheim am Rhein, Nordrhein-Westfalen, Deutschland

  • -

  • -

    Leverkusen

Ausbildung

  • Ludwig-Maximilians-Universität München Grafik

    Ludwig-Maximilians Universität München

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    Dissertation „Individual fitness correlates in consecutive years of pair bond in Upland Geese”
    - behavioral ecology
    - signalling theory
    - reproductive investment
    - spectrophotometry
    - faecal glucocorticoid measures
    - leucocyte profiles & plasma biochemistry

  • –


    Ecology
    Botany
    Tropical ecology

    Diploma thesis: „Begging behaviour of Wilson’s storm-petrel (Oceanites oceanicus) and its effect on parental investment.”

Veröffentlichungen

  • An efficient and pragmatic approach for regulatory aquatic mixture risk assessment of pesticides

    Environmental Sciences Europe 34(1)

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  • Open Science in Regulatory Environmental Risk Assessment

    Integrated Environmental Assessment and Management 17(1)

    Abstract
    A possible way to alleviate the public skepticism toward regulatory science is to increase transparency by making all data and value judgments used in regulatory decision making accessible for public interpretation, ideally early on in the process, and following the concepts of Open Science. This paper discusses the opportunities and challenges in strengthening Open Science initiatives in regulatory environmental risk assessment (ERA). In this discussion paper, we argue that the…

    Abstract
    A possible way to alleviate the public skepticism toward regulatory science is to increase transparency by making all data and value judgments used in regulatory decision making accessible for public interpretation, ideally early on in the process, and following the concepts of Open Science. This paper discusses the opportunities and challenges in strengthening Open Science initiatives in regulatory environmental risk assessment (ERA). In this discussion paper, we argue that the benefits associated with Open Science in regulatory ERA far outweigh its perceived risks. All stakeholders involved in regulatory ERA (e.g., governmental regulatory authorities, private sector, academia, and nongovernmental organizations), as well as professional organizations like the Society of Environmental Toxicology and Chemistry, can play a key role in supporting the Open Science initiative, by promoting the use of recommended reporting criteria for reliability and relevance of data and tools used in ERA, and by developing a communication strategy for both professionals and nonprofessionals to transparently explain the socioeconomic value judgments and scientific principles underlying regulatory ERA. Integr Environ Assess Manag 2021;17:1229–1242. © 2021 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC)

    Andere Autor:innen
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  • Can faecal glucocorticoid metabolites be used to monitor body condition in wild Upland geese Chloephaga picta leucoptera?

    Behavioral Ecology and Sociobiology, 65, 1491-1498

    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…

    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.

    Andere Autor:innen
    • Alexandra Kuchar
    • David Joachim Gladbach
    • Martina Koch
    • Erich Möstl
    • Petra Quillfeldt
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  • Male achromatic wing colouration is related to body condition and female reproductive investment in a dichromatic species, the Upland goose, Chloephaga picta leucoptera.

    Journal of Ethology, 29, 243-249

    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…

    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.

    Andere Autor:innen
    • David Joachim Gladbach
    • Petra Quillfeldt
    Veröffentlichung anzeigen

  • Female-specific colouration, carotenoids and reproductive investment in a dichromatic species, the Upland goose Chloephaga picta leucoptera.

    Behavioral Ecology and Sociobiology , 64, 1779-1789

    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…

    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...

    Andere Autor:innen
    • David Joachim Gladbach
    • Bart Kempenears
    • Petra Quillfeldt
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  • Variations in leucocyte profiles and plasma biochemistry are related to different aspects of parental investment in male and female Upland geese Chloephaga picta leucoptera.

    Comparative Biochemistry and Physiology - Part A, 156, 269-277

    The analysis of plasma biochemistry and haematology to monitor the condition of birds in the wild has been found a useful tool in ecological research. Despite biparental investment in most wild birds studied, some studies of condition indices found sex differences, and attributed these to the costs of egg formation or brooding in females or a higher contribution of males to chick rearing. We studied the natural variation of haematological and plasma biochemistry parameters (namely leucocyte…

    The analysis of plasma biochemistry and haematology to monitor the condition of birds in the wild has been found a useful tool in ecological research. Despite biparental investment in most wild birds studied, some studies of condition indices found sex differences, and attributed these to the costs of egg formation or brooding in females or a higher contribution of males to chick rearing. We studied the natural variation of haematological and plasma biochemistry parameters (namely leucocyte, lymphocyte and heterophil counts, H/L ratio and plasma concentrations of proteins, triglycerides and carotenoids) in relation to the different measures of parental investment in males and females in the Upland goose (Chloephaga picta leucoptera), a socially monogamous species. We found no sex differences in haematological and most plasma biochemistry parameters, but a relation to different aspects of parental investment in breeding male and female Upland geese. H/L ratios were related to body condition and capture date in males while leucocyte counts, plasma protein and plasma carotenoid concentrations varied with clutch measures and hatching date in females. Higher H/L ratios of males in a low body condition and later in the year may reflect stress associated with the investment into the establishment and defence of the breeding territory. Females with higher clutch volumes had lower total leucocyte and lymphocyte numbers and higher levels of plasma protein. Earlier hatching dates were associated with lower numbers of all leucocyte types and higher values of plasma carotenoid concentrations. This indicates that differences in health state are reflected in reproductive performance in female Upland geese. We also found sexual differences in the repeatability of haematological and plasma biochemistry parameters between years and therefore suggest that their potential as a measure of individual quality differs between male and female Upland geese...

    Andere Autor:innen
    • David Joachim Gladbach

  • Chick provisioning and nest attendance of male and female Wilson’s storm-petrel Oceanites oceanicus

    Polar Biology, 32, 1315-1321

    Seabirds show a range of patterns of sexual size dimorphism and sex-specific parental investment, but the underlying causes remain poorly understood. The aim of the present study was to test two longstanding hypotheses of parental investment in a sexually monomorphic species, Wilson’s storm petrel Oceanites oceanicus, namely that males attend chicks more frequently and females deliver larger meals (Beck and Brown in Br Antarct Surv Sci Rep 69:1–54, 1972). We recorded in eight seasons, both…

    Seabirds show a range of patterns of sexual size dimorphism and sex-specific parental investment, but the underlying causes remain poorly understood. The aim of the present study was to test two longstanding hypotheses of parental investment in a sexually monomorphic species, Wilson’s storm petrel Oceanites oceanicus, namely that males attend chicks more frequently and females deliver larger meals (Beck and Brown in Br Antarct Surv Sci Rep 69:1–54, 1972). We recorded in eight seasons, both during incubation and chick rearing, which adult was caught first in a nest and found no difference in the probability of catching a male or a female first in any year. Additionally, in five seasons we employed a miniature video camera to record nest attendance during chick rearing and found no significant difference except for 2006, a year with very low krill availability, where females visited the nest less often than males. We then combined video observations with periodic weighing of chicks to estimate mean daily feeding mass (g/day) of males and females and found no difference in the amount of food delivered per day between the sexes. However, in years with low krill availability, males and females tended to use different strategies to achieve the same feeding rates, with females undertaking longer foraging trips and delivering heavier meals. Thus, our results do not support the hypothesis of a general sex-specific parental investment in Wilson’s storm petrels, but a tendency for a context-dependent sex-specific investment in the years of food shortage

    Andere Autor:innen
    • Christina Braun
    • Anja Nordt
    • Hans-Ulrich Peter
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  • Introduced mammals coexist with seabirds at New Island, Falkland Islands: Abundance, habitat preferences and stable isotope analysis of diet.

    Polar Biology, 31, 333-349

    The largest known colony of Thin-billed prions Pachyptila belcheri has been coexisting with introduced mammals for more than 100 years. Three of the introduced mammals are potential predators of adults, eggs and chicks, namely ship rats Rattus rattus, house mice Mus musculus and feral cats Felis catus. We here determine habitat preferences over three seasons and dietary patterns of the unique set of introduced predators at New Island, Falkland Islands, with emphasis on the ship rats. Our study…

    The largest known colony of Thin-billed prions Pachyptila belcheri has been coexisting with introduced mammals for more than 100 years. Three of the introduced mammals are potential predators of adults, eggs and chicks, namely ship rats Rattus rattus, house mice Mus musculus and feral cats Felis catus. We here determine habitat preferences over three seasons and dietary patterns of the unique set of introduced predators at New Island, Falkland Islands, with emphasis on the ship rats. Our study highlights spatial and temporal differences in the levels of interaction between predators and native seabirds. Rats and mice had a preference for areas providing cover in the form of the native tussac grass Parodiochloa flabellata or introduced gorse Ulex europaeus. Their diet differed markedly between areas, over the season and between age groups in rats. During the incubation period of the prions in November–December, ship rats had mixed diets, composed mainly of plants and mammals, while only 3% of rats had ingested birds. The proportion of ingested birds, including scavenged, increased in the prion chick-rearing period, when 60% of the rats consumed prions. We used δ13C and δ15N to compare the importance of marine-derived food between mammal species and individuals, and found that rats in all but one area took diet of partly marine origin, prions being the most frequently encountered marine food. Most house mice at New Island mainly had terrestrial diet. The stable isotope analysis of tissues with different turnover times indicated that individual rats and mice were consistent in their diet over weeks, but opportunistic in the short term. Some individuals (12% of rats and 7% of mice) were highly specialized in marine-derived food. According to the isotope ratios in a small sample of cat faeces, rodents and rabbits were the chief prey of cats at New Island. Although some individuals of all three predators...

    Andere Autor:innen
    • Petra Quillfeldt
    • Ingrid Schenk
    • Rona A. R. McGill
    • Ian J. Strange
    • Juan F. Masello
    • Verena Roesch
    • Robert W. Furness
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  • Foraging areas of Wilson’s storm-petrel Oceanites oceanicus in the breeding and inter-breeding period determined by stable isotope analysis.

    Polar Biology, 30, 1005-1012

    To understand the year-round ecology of seabirds it is necessary not only to study the birds in their breeding grounds, but also to gain information about their movements during the inter-breeding period. Especially for the smaller procellariiform species, such studies are still scarce, mainly due to methodological problems. The recovery rates of banded birds are low and satellite tracking devices still far too heavy to equip these small birds. Here, we present data on foraging areas of…

    To understand the year-round ecology of seabirds it is necessary not only to study the birds in their breeding grounds, but also to gain information about their movements during the inter-breeding period. Especially for the smaller procellariiform species, such studies are still scarce, mainly due to methodological problems. The recovery rates of banded birds are low and satellite tracking devices still far too heavy to equip these small birds. Here, we present data on foraging areas of Wilson’s storm-petrel Oceanites oceanicus inferred from stable isotope analysis. We compared ratios of δ13C and δ15N between different life-history stages and between the breeding and inter-breeding period. Samples of adult and chick feathers, chick down and egg-white were taken between 1996 and 2005 on King-George-Island, South Shetland Islands. δ13C values can be clearly distinguished between the breeding and inter-breeding period. During the inter-breeding period, most pre-breeders foraged in the same area as breeders, but four pre-breeders were found to forage in latitudes north of the Subtropical Front. In the 2002 inter-breeding period adult birds wintered further north than in 2003, which is in line with the different locations of food rich frontal systems in these years. We show that isotope ratios of both δ13C and δ15N increase from egg white, over chick down to chick feathers. We suggest that this isotopic change, due to a change in both foraging location and diet between egg production and chick feeding, may be used to trace the shift from the use of maternal resources from the egg to the uptake of nutrients from the diet.

    Andere Autor:innen
    • Rona A R McGill
    • Petra Quillfeldt
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Auszeichnungen/Preise

  • Young Presenter Award

    DO-G (Deutsche Ornithologen-Gesellschaft)

  • Best Poster Award, XXVIII SCAR Conference, Bremen

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  • Winner of the “Wissenschaftsschreiber-Wettbewerb”

    Friedrich-Schiller-Universität Jena

    Contest on Scientific Writing

Sprachen

  • Englisch

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  • Französisch

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  • Spanisch

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Organisationen

  • Verein der Freunde und Förderer des katholischen Familienzentrums St. Johannes Baptist Leichlingen e.V.

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