Datum semináře: 
24.11.2016
jiné
Abstrakt: 

The Pace-of-Life syndrome (POLS) hypothesis suggests that different individuals within a species have different combinations of physiological, behavioural and life-history traits, which are linked together. Typically, researchers have classified individuals into a few, often two, major categories:  proactive (or bold) and reactive (or shy). Following the POLS proactive individuals are for instance more active and bold to support a faster metabolism and a higher growth rate, they have a lower stress response, and they typically have a higher risk of mortality. The reactive individuals have the opposite traits. In the seminar, I will discuss the POLS hypothesis in the light of several recent experiments on wild brown trout. I will show that the POLS is not as straight forward and intuitive as presented in conceptual papers on the topic. For instance, while several traits are linked together in a syndrome in the brown trout, the predictions from POLS are not confirmed by empirical data. As an example, during the early juvenile stage more active fish tend to have a higher probability of survival, despite a higher presumed exposure to predators and competitors. A potential explanation, relating to the behavioural ecology of the juvenile brown trout will be presented. Furthermore, I will show that the probability for survival for different POLS categories of trout likely changes during their ontogeny.

Jazyk příspěvku: 
anglicky