Andreas Koenig

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Via the current model on the evolutionary ecology of female social relationships, Sterck et al. (1997) argue that ecological conditions determine how competition over food resources affects female fitness. The relative importance of different modes of competition then affects female social relationships and dispersal patterns. I outline the model and review(More)
Predictions of ecological models on female social relationships (van Schaik 1989) and their links with food distribution and the potential competitive regime are used to analyze the feeding and spatial behavior, and resource density, size, distribution, and quality in a forest population of Hanuman langurs (Presbytis entellus). In contrast to other(More)
Van Schaik’s socioecological model predicts interrelations among food distribution, competitive regimes, and female social relationships. To test the internal consistency of the model, feeding competition was examined in three differently sized groups of a forest-dwelling population of Hanuman langurs (Semnopithecus entellus). The nutritional condition of(More)
Socioecological theory suggests a link between the strength of competition for food/safety, rates of agonism, structure of dominance hierarchies, and dispersal among group-living females. This study presents preliminary data on agonistic behavior and dominance relationships for female Phayre's leaf monkeys (Trachypithecus phayrei), a species in which(More)
Selection and use patterns of sleeping sites in nonhuman primates are suggested to have multiple functions, such as predation avoidance, but they might be further affected by range defense as well as foraging constraints or other factors. Here, we investigate sleeping tree selection by the male and female members of one group of pileated gibbons (Hylobates(More)
Throughout Central Europe, foxes have taken over urban areas as their habitat. In Southern Germany, these foxes are also carriers of the small fox tapeworm, which causes a serious zoonotic infection in humans. Therefore, a survey was carried out in a suburb of the city of Munich. A postal questionnaire was used to analyse the attitudes, opinions and fears(More)
Socio-ecological models aim to predict the variation in social systems based on a limited number of ecological parameters. Since the 1960s, the original model has taken two paths: one relating to grouping patterns and mating systems and one relating to grouping patterns and female social structure. Here, we review the basic ideas specifically with regard to(More)
Basic fibroblast growth factor (bFGF) is a pleiotropic cytokine which has recently been shown to delay fludarabine-induced apoptosis in B cell chronic lymphocytic leukemia (B-CLL) cells. To investigate the potential mechanism of bFGF-mediated delay of apoptosis, two EBV-transformed B prolymphocytic cell lines (JVM-2, JVM-13), one EBV-transformed B-CLL cell(More)
To determine nutritional and social influences on life history traits and mating behavior in female langur monkeys, new long-term data for a feral population living in multi-male groups under poor nutritional conditions are presented and compared with published long-term data for the same species living in one-male groups under excellent nutritional(More)
A survey on the prevalence of Echinococcus multilocularis in foxes was conducted in the administrative district of Starnberg (federal state of Bavaria, Germany) and some adjacent municipalities from October 2002 to March 2003. The background to the study was the scarcity of recent data for Bavaria, where, in contrast to neighbouring regions, a general(More)