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  1. AU="Koch, Flávia"
  2. AU="Stroo, Esther"
  3. AU="Bauer, B."
  4. AU="Heidorn, Marc William"
  5. AU="Doan, Ryan N"
  6. AU=Kovo Michal
  7. AU="Gaglani, Shiv"
  8. AU="Prathap G"
  9. AU="Luana Bessa"

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  1. Buch ; Dissertation / Habilitation: Effect of IL-15 on T-cell differentiation

    Koch, Flávia

    2014  

    Verfasserangabe vorgelegt von Flávia Koch
    Sprache Englisch
    Umfang 165 S., graph. Darst.
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Tübingen, 2014
    Anmerkung Zsfassung in dt. und engl. Sprache
    Datenquelle Ehemaliges Sondersammelgebiet Küsten- und Hochseefischerei

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

    Rudolph, Katja / Daniel, Rolf / Fichtel, Claudia / Heistermann, Michael / Kappeler, Peter M / Koch, Flávia / Schneider, Dominik

    Behavioral ecology and sociobiology. 2019 Sept., v. 73, no. 9

    2019  

    Abstract: Group size is a key component of sociality and can affect individual health and fitness. However, proximate links explaining this relationship remain poorly understood, partly because previous studies neglected potential confounding effects of ecological ...

    Abstract Group size is a key component of sociality and can affect individual health and fitness. However, proximate links explaining this relationship remain poorly understood, partly because previous studies neglected potential confounding effects of ecological factors. Here, we correlated group size with various measures of health while controlling for measures of seasonality and habitat quality, to explore trade-offs related to group living in a mainly folivorous primate—Verreaux’s sifakas (Propithecus verreauxi). Over a course of 2 years, we studied 42 individuals of 7 differently sized groups (range 2–10) and combined measures of faecal glucocorticoid metabolites (n > 2300 samples), parasitism (n > 500 samples), ranging and activity patterns, together with estimates of habitat quality (measures of ~ 7000 feeding trees). None of our measures was correlated with group size, while seasonality, but not habitat quality, impacted almost all examined variables. We conclude that group size alone might be insufficient to explain patterns in the sociality-health nexus or that the small range of group sizes in this species does not induce effects suggested for species living in larger groups. An optimal group size balancing the advantages and disadvantages of living in differently sized groups may not exist for Verreaux’s sifakas. Our results do not support predictions of the ecological constraints hypothesis or the optimal group size hypothesis as they may only account for species limited in group size by ecological factors—a condition that may not apply to the majority of folivorous mammals, which seem to be limited by social factors. SIGNIFICANCE STATEMENT: Group size is a key component of group living and can crucially impact individual health. Ecological variables may modulate this relationship, but they were often neglected in previous studies. To better understand the links between sociality and health, we, for the first time in a mammal, simultaneously examined variation in ranging patterns, daily activities, glucocorticoid concentrations, and parasitism as a function of group size and under consideration of measures of seasonality and habitat quality in wild Verreaux’s sifakas (Propithecus verreauxi). Group size had no impact on individual health indicators, while seasonal variation in food availability and temperature differences, but not habitat quality, affected the majority of variables. We demonstrate strong impacts of environmental factors on socio-ecological traits and conclude that group size on its own might be insufficient to explain patterns in the sociality-health nexus.
    Schlagwörter environmental factors ; food availability ; glucocorticoids ; group size ; habitats ; Indriidae ; mammals ; metabolites ; parasitism ; prediction ; seasonal variation ; social behavior ; social factors ; temperature ; trees
    Sprache Englisch
    Erscheinungsverlauf 2019-09
    Umfang p. 132.
    Erscheinungsort Springer Berlin Heidelberg
    Dokumenttyp Artikel
    ZDB-ID 194510-5
    ISSN 1432-0762 ; 0340-5443
    ISSN (online) 1432-0762
    ISSN 0340-5443
    DOI 10.1007/s00265-019-2746-0
    Datenquelle NAL Katalog (AGRICOLA)

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  3. Artikel ; Online: The role of the residence-effect on the outcome of intergroup encounters in Verreaux's sifakas.

    Koch, Flávia / Signer, Johannes / Kappeler, Peter M / Fichtel, Claudia

    Scientific reports

    2016  Band 6, Seite(n) 28457

    Abstract: Intergroup competition has an important impact on the survival and fitness of individuals in group-living species. However, factors influencing the probability of winning an encounter are not fully understood. We studied the influence of numerical ... ...

    Abstract Intergroup competition has an important impact on the survival and fitness of individuals in group-living species. However, factors influencing the probability of winning an encounter are not fully understood. We studied the influence of numerical advantage and location of the encounter on the chances of winning in eight neighboring groups of Verreaux's sifakas (Propithecus verreauxi), in Kirindy Forest, western Madagascar. Intergroup encounters were inferred from spatial data collected via GPS loggers over a period of two years. Location, i.e., the proximity to the respective core area, rather than the numerical advantage of a group in a given encounter, influenced the probability of winning. Accordingly, the high value that resident groups attribute to exclusive and intensively used areas increased their motivation in defending these locations against intruders. Moreover, losers used the encounter area less often than winners within a month after the encounter, suggesting that losing also entails long-term costs. Thus, our results suggest that in gregarious animals the particular circumstances of each encounter, such as the location, can outweigh group characteristics and predict the chances of winning an intergroup encounter.
    Sprache Englisch
    Erscheinungsdatum 2016-06-22
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep28457
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel: Intergroup encounters in Verreaux's sifakas (

    Koch, Flávia / Signer, Johannes / Kappeler, Peter M / Fichtel, Claudia

    Behavioral ecology and sociobiology

    2016  Band 70, Seite(n) 797–808

    Abstract: Abstract: Individuals living in groups have to achieve collective action for successful territorial defense. Because conflicts between neighboring groups always involve risks and costs, individuals must base their decision to participate in a given ... ...

    Abstract Abstract: Individuals living in groups have to achieve collective action for successful territorial defense. Because conflicts between neighboring groups always involve risks and costs, individuals must base their decision to participate in a given conflict on an evaluation of the trade-off between potential costs and benefits. Since group members may differ in motivation to engage in group encounters, they exhibit different levels of participation in conflicts. In this study, we investigated factors influencing participation in intergroup encounters in Verreaux's sifakas (
    Significance statement: Cooperation among group-living animals is often challenged by collective action problems resulting from individual differences in interests in contributing to collective behaviors. Intergroup encounters involve distinguished costs and benefits for each individual despite being in the same social group. Therefore, encounters between groups offer a good opportunity to investigate individual participation in collective action. In this study, we investigate the influence of different incentives on individual participation in intergroup encounters in wild Malagasy primate, Verreaux's sifakas. We propose a novel approach that takes into account the variable circumstances of each conflict, such as the number of individuals fighting in both groups as a predictor for participation. We believe that our study not only provides novel data on wild sifakas, but it also offers new perspectives for the interpretation of intergroup relationships in other taxa.
    Sprache Englisch
    Erscheinungsdatum 2016-03-30
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 194510-5
    ISSN 1432-0762 ; 0340-5443
    ISSN (online) 1432-0762
    ISSN 0340-5443
    DOI 10.1007/s00265-016-2105-3
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  5. Artikel ; Online: Sex and seasonal differences in diet and nutrient intake in Verreaux's sifakas (Propithecus verreauxi).

    Koch, Flávia / Ganzhorn, Joerg U / Rothman, Jessica M / Chapman, Colin A / Fichtel, Claudia

    American journal of primatology

    2016  Band 79, Heft 4, Seite(n) 1–10

    Abstract: Fluctuations in food availability are a major challenge faced by primates living in seasonal climates. Variation in food availability can be especially challenging for females, because of the high energetic costs of reproduction. Therefore, females must ... ...

    Abstract Fluctuations in food availability are a major challenge faced by primates living in seasonal climates. Variation in food availability can be especially challenging for females, because of the high energetic costs of reproduction. Therefore, females must adapt the particular demands of the different reproductive stages to the seasonal availability of resources. Madagascar has a highly seasonal climate, where food availability can be extremely variable. We investigated the seasonal changes in diet composition, nutrient and energy intake of female and male sifakas (Propithecus verreauxi) in a dry deciduous forest in western Madagascar. We examined how females adjust their diet to different reproductive stages. Seasonality affected the diet of both sexes; particularly in the dry season (Apr-Oct) with low availability of food items, especially fruits, males and females had a reduced nutrient and energy intake compared to the wet season (Nov-Mar) with higher food and fruit availability. The comparison of the diet between sexes in different reproductive stages showed that during the late stage of lactation (Nov-Jan) females had higher food intake, and as a result they had a higher intake of macronutrients (crude protein, fat and non-structured carbohydrates (TNC)) and energy than males. These differences were not present during the pregnancy of females, with both sexes having similar intake of macronutrients and energy during that stage. The increase in the intake of macronutrients observed for females during late lactation could be related to the higher energetic demands of this stage of reproduction. Thus, the observed pattern in the diet indicates that sifaka females are following a capital breeding strategy, whereby females potentially store enough nutrients to cope with the reproduction costs in periods of low food availability.
    Mesh-Begriff(e) Animals ; Diet ; Energy Intake ; Female ; Madagascar ; Male ; Pregnancy ; Seasons ; Strepsirhini
    Sprache Englisch
    Erscheinungsdatum 2016-10-25
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 1495834-X
    ISSN 1098-2345 ; 0275-2565
    ISSN (online) 1098-2345
    ISSN 0275-2565
    DOI 10.1002/ajp.22595
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  6. Artikel: Patterns of seasonality and group membership characterize the gut microbiota in a longitudinal study of wild Verreaux's sifakas (

    Springer, Andrea / Fichtel, Claudia / Al-Ghalith, Gabriel A / Koch, Flávia / Amato, Katherine R / Clayton, Jonathan B / Knights, Dan / Kappeler, Peter M

    Ecology and evolution

    2017  Band 7, Heft 15, Seite(n) 5732–5745

    Abstract: The intestinal microbiota plays a major role in host development, metabolism, and health. To date, few longitudinal studies have investigated the causes and consequences of microbiota variation in wildlife, although such studies provide a comparative ... ...

    Abstract The intestinal microbiota plays a major role in host development, metabolism, and health. To date, few longitudinal studies have investigated the causes and consequences of microbiota variation in wildlife, although such studies provide a comparative context for interpreting the adaptive significance of findings from studies on humans or captive animals. Here, we investigate the impact of seasonality, diet, group membership, sex, age, and reproductive state on gut microbiota composition in a wild population of group-living, frugi-folivorous primates, Verreaux's sifakas (
    Sprache Englisch
    Erscheinungsdatum 2017-06-15
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2635675-2
    ISSN 2045-7758
    ISSN 2045-7758
    DOI 10.1002/ece3.3148
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  7. Artikel ; Online: Correction to: Review of GPS collar deployments and performance on nonhuman primates.

    Dore, Kerry M / Hansen, Malene F / Klegarth, Amy R / Fichtel, Claudia / Koch, Flávia / Springer, Andrea / Kappeler, Peter / Parga, Joyce A / Humle, Tatyana / Colin, Christelle / Raballand, Estelle / Huang, Zhi-Pang / Qi, Xiao-Guang / Di Fiore, Anthony / Link, Andrés / Stevenson, Pablo R / Stark, Danica J / Tan, Noeleen / Gallagher, Christa A /
    Anderson, C Jane / Campbell, Christina J / Kenyon, Marina / Pebsworth, Paula / Sprague, David / Jones-Engel, Lisa / Fuentes, Agustín

    Primates; journal of primatology

    2020  Band 61, Heft 3, Seite(n) 389–390

    Abstract: In the original publication of the article, figure 1 was wrongly published as a duplication. ...

    Abstract In the original publication of the article, figure 1 was wrongly published as a duplication.
    Sprache Englisch
    Erscheinungsdatum 2020-02-05
    Erscheinungsland Japan
    Dokumenttyp Journal Article ; Published Erratum
    ZDB-ID 2100453-5
    ISSN 1610-7365 ; 0032-8332
    ISSN (online) 1610-7365
    ISSN 0032-8332
    DOI 10.1007/s10329-020-00800-x
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  8. Artikel ; Online: Review of GPS collar deployments and performance on nonhuman primates.

    Dore, Kerry M / Hansen, Malene F / Klegarth, Amy R / Fichtel, Claudia / Koch, Flávia / Springer, Andrea / Kappeler, Peter / Parga, Joyce A / Humle, Tatyana / Colin, Christelle / Raballand, Estelle / Huang, Zhi-Pang / Qi, Xiao-Guang / Di Fiore, Anthony / Link, Andrés / Stevenson, Pablo R / Stark, Danica J / Tan, Noeleen / Gallagher, Christa A /
    Anderson, C Jane / Campbell, Christina J / Kenyon, Marina / Pebsworth, Paula / Sprague, David / Jones-Engel, Lisa / Fuentes, Agustín

    Primates; journal of primatology

    2020  Band 61, Heft 3, Seite(n) 373–387

    Abstract: Over the past 20 years, GPS collars have emerged as powerful tools for the study of nonhuman primate (hereafter, "primate") movement ecology. As the size and cost of GPS collars have decreased and performance has improved, it is timely to review the use ... ...

    Abstract Over the past 20 years, GPS collars have emerged as powerful tools for the study of nonhuman primate (hereafter, "primate") movement ecology. As the size and cost of GPS collars have decreased and performance has improved, it is timely to review the use and success of GPS collar deployments on primates to date. Here we compile data on deployments and performance of GPS collars by brand and examine how these relate to characteristics of the primate species and field contexts in which they were deployed. The compiled results of 179 GPS collar deployments across 17 species by 16 research teams show these technologies can provide advantages, particularly in adding to the quality, quantity, and temporal span of data collection. However, aspects of this technology still require substantial improvement in order to make deployment on many primate species pragmatic economically. In particular, current limitations regarding battery lifespan relative to collar weight, the efficacy of remote drop-off mechanisms, and the ability to remotely retrieve data need to be addressed before the technology is likely to be widely adopted. Moreover, despite the increasing utility of GPS collars in the field, they remain substantially more expensive than VHF collars and tracking via handheld GPS units, and cost considerations of GPS collars may limit sample sizes and thereby the strength of inferences. Still, the overall high quality and quantity of data obtained, combined with the reduced need for on-the-ground tracking by field personnel, may help defray the high equipment cost. We argue that primatologists armed with the information in this review have much to gain from the recent, substantial improvements in GPS collar technology.
    Mesh-Begriff(e) Animals ; Ecology/methods ; Geographic Information Systems/statistics & numerical data ; Movement ; Primates
    Sprache Englisch
    Erscheinungsdatum 2020-01-21
    Erscheinungsland Japan
    Dokumenttyp Journal Article ; Review
    ZDB-ID 2100453-5
    ISSN 1610-7365 ; 0032-8332
    ISSN (online) 1610-7365
    ISSN 0032-8332
    DOI 10.1007/s10329-020-00793-7
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  9. Artikel ; Online: The importance of protein in leaf selection of folivorous primates.

    Ganzhorn, Joerg U / Arrigo-Nelson, Summer J / Carrai, Valentina / Chalise, Mukesh K / Donati, Giuseppe / Droescher, Iris / Eppley, Timothy M / Irwin, Mitchell T / Koch, Flávia / Koenig, Andreas / Kowalewski, Martin M / Mowry, Christopher B / Patel, Erik R / Pichon, Claire / Ralison, Jose / Reisdorff, Christoph / Simmen, Bruno / Stalenberg, Eleanor / Starrs, Danswell /
    Terboven, Juana / Wright, Patricia C / Foley, William J

    American journal of primatology

    2016  Band 79, Heft 4, Seite(n) 1–13

    Abstract: Protein limitation has been considered a key factor in hypotheses on the evolution of life history and animal communities, suggesting that animals should prioritize protein in their food choice. This contrasts with the limited support that food selection ...

    Abstract Protein limitation has been considered a key factor in hypotheses on the evolution of life history and animal communities, suggesting that animals should prioritize protein in their food choice. This contrasts with the limited support that food selection studies have provided for such a priority in nonhuman primates, particularly for folivores. Here, we suggest that this discrepancy can be resolved if folivores only need to select for high protein leaves when average protein concentration in the habitat is low. To test the prediction, we applied meta-analyses to analyze published and unpublished results of food selection for protein and fiber concentrations from 24 studies (some with multiple species) of folivorous primates. To counter potential methodological flaws, we differentiated between methods analyzing total nitrogen and soluble protein concentrations. We used a meta-analysis to test for the effect of protein on food selection by primates and found a significant effect of soluble protein concentrations, but a non-significant effect for total nitrogen. Furthermore, selection for soluble protein was reinforced in forests where protein was less available. Selection for low fiber content was significant but unrelated to the fiber concentrations in representative leaf samples of a given forest. There was no relationship (either negative or positive) between the concentration of protein and fiber in the food or in representative samples of leaves. Overall our study suggests that protein selection is influenced by the protein availability in the environment, explaining the sometimes contradictory results in previous studies on protein selection. Am. J. Primatol. 79:e22550, 2017. © 2016 Wiley Periodicals, Inc.
    Mesh-Begriff(e) Animals ; Dietary Fiber ; Feeding Behavior ; Food Preferences ; Plant Leaves ; Primates
    Chemische Substanzen Dietary Fiber
    Sprache Englisch
    Erscheinungsdatum 2016-04-19
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Meta-Analysis
    ZDB-ID 1495834-x
    ISSN 1098-2345 ; 0275-2565
    ISSN (online) 1098-2345
    ISSN 0275-2565
    DOI 10.1002/ajp.22550
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  10. Artikel: A comprehensive analysis of autocorrelation and bias in home range estimation

    Noonan, Michael J / Akre, Thomas S / Alberts, Susan C / Ali, Abdullahi H / Altmann, Jeanne / Antunes, Pamela Castro / Belant, Jerrold L / Beyer, Dean / Blaum, Niels / Böhning‐Gaese, Katrin / Calabrese, Justin M / Cullen, Laury, Jr / de Paula, Rogerio Cunha / Dekker, Jasja / Drescher‐Lehman, Jonathan / Fagan, William F / Farwig, Nina / Fichtel, Claudia / Fischer, Christina /
    Fleming, Christen H / Ford, Adam T / Goheen, Jacob R / Janssen, René / Jeltsch, Florian / Kappeler, Peter M / Kauffman, Matthew / Koch, Flávia / LaPoint, Scott / Markham, A. Catherine / Medici, Emilia Patricia / Morato, Ronaldo G / Mueller, Thomas / Nathan, Ran / Oliveira‐Santos, Luiz Gustavo R / Olson, Kirk A / Patterson, Bruce D / Paviolo, Agustin / Ramalho, Emiliano Esterci / Rösner, Sascha / Schabo, Dana G / Selva, Nuria / Sergiel, Agnieszka / Spiegel, Orr / Thompson, Peter / Tucker, Marlee A / Ullmann, Wiebke / Xavier da Silva, Marina / Zięba, Filip / Zwijacz‐Kozica, Tomasz

    Ecological monographs. 2019 May, v. 89, no. 2

    2019  

    Abstract: Home range estimation is routine practice in ecological research. While advances in animal tracking technology have increased our capacity to collect data to support home range analysis, these same advances have also resulted in increasingly ... ...

    Abstract Home range estimation is routine practice in ecological research. While advances in animal tracking technology have increased our capacity to collect data to support home range analysis, these same advances have also resulted in increasingly autocorrelated data. Consequently, the question of which home range estimator to use on modern, highly autocorrelated tracking data remains open. This question is particularly relevant given that most estimators assume independently sampled data. Here, we provide a comprehensive evaluation of the effects of autocorrelation on home range estimation. We base our study on an extensive data set of GPS locations from 369 individuals representing 27 species distributed across five continents. We first assemble a broad array of home range estimators, including Kernel Density Estimation (KDE) with four bandwidth optimizers (Gaussian reference function, autocorrelated‐Gaussian reference function [AKDE], Silverman's rule of thumb, and least squares cross‐validation), Minimum Convex Polygon, and Local Convex Hull methods. Notably, all of these estimators except AKDE assume independent and identically distributed (IID) data. We then employ half‐sample cross‐validation to objectively quantify estimator performance, and the recently introduced effective sample size for home range area estimation (N^area) to quantify the information content of each data set. We found that AKDE 95% area estimates were larger than conventional IID‐based estimates by a mean factor of 2. The median number of cross‐validated locations included in the hold‐out sets by AKDE 95% (or 50%) estimates was 95.3% (or 50.1%), confirming the larger AKDE ranges were appropriately selective at the specified quantile. Conversely, conventional estimates exhibited negative bias that increased with decreasing N^area. To contextualize our empirical results, we performed a detailed simulation study to tease apart how sampling frequency, sampling duration, and the focal animal's movement conspire to affect range estimates. Paralleling our empirical results, the simulation study demonstrated that AKDE was generally more accurate than conventional methods, particularly for small N^area. While 72% of the 369 empirical data sets had >1,000 total observations, only 4% had an N^area >1,000, where 30% had an N^area <30. In this frequently encountered scenario of small N^area, AKDE was the only estimator capable of producing an accurate home range estimate on autocorrelated data.
    Schlagwörter animals ; autocorrelation ; data collection ; global positioning systems ; home range ; least squares
    Sprache Englisch
    Erscheinungsverlauf 2019-05
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 410216-2
    ISSN 1557-7015 ; 0012-9615
    ISSN (online) 1557-7015
    ISSN 0012-9615
    DOI 10.1002/ecm.1344
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