Dominance, aggression and testosterone in wild chimpanzees: a test of the 'challenge hypothesis'

Article Abstract:

Behavioural observations and noninvasive hormone sampling of 11 male chimpanzees, was conducted, to test predictions of the challenge hypothesis that variation in male testosterone levels is more closely associated with aggression in reproductive contexts than it is with changes in reproductive physiology. It was founded that high-ranking chimpanzees were more aggressive than low-ranking males and produced higher levels of urinary testosterone.

Health aspects, Evaluation, Hormone research, Animal reproduction

---

Genetic correlates of social behaviour in wild chimpanzees: evidence from mitrochondrial DNA

Article Abstract:

A study designed to test the hypothesis that chimpanzees living in a natural setting preferentially select alliances with related animals is presented. The social behaviour of chimpanzees living in Uganda's Kibale Forest and in other forest locations is examined using DNA sequence data. Results show that kin selection is not a strong force in the intra-community affiliation of chimpanzees.

Social behavior in animals, Animal social behavior, Animal genetics

---

Dominance, fatness and fitness in female American bison, Bison bison

Article Abstract:

Indicators of fitness were examined in relation to dominance rank in a group of adult female American bison in semifree-ranging conditions. The findings suggest that dominance rank correlated significantly with three indicators of body condition, weight, speed of hair loss, and fatness.

United States, All Other Animal Production, Buffaloes, Physiological aspects, Bison, Animal development

Similar abstracts:

• Abstracts: Cloning and expression of apical membrane water channel of rat kidney collecting tubule. The evolution of apical dominance in maize
• Abstracts: Post-fledging care, multiple breeding and the costs of reproduction in the great tit. Adoption in the emperor penguin, Aptenodytes forsteri
• Abstracts: Structure of a 14-3-3 protein and implications for coordination of multiple signalling pathways. The role of turns in the structure of an alpha-helical protein
• Abstracts: Marginal predation methodologies and the importance of predator preferences. Behavioural uniformity as a response to cues of predation risk
• Abstracts: Maturation trends indicative of rapid evolution preceded the collapse of northern cod. A giant outburst two years before the core-collapse of a massive star

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.