Abstract In recent years, many studies have investigated the potential state dependence of individual differences in behaviour, with aim to understand proximate and ultimate causes consequences animal personality. Among variables that could affect behavioural expression is size mass, but few found associations at among-individual levels. Insufficient sampling incorrect analysis data are cited a...

Understanding the linkage between behavioral types and dispersal tendency has become a pressing issue in light of global change biological invasions. Here, we explore whether dispersing individuals exhibit that differ from those remaining source population. We investigated feral population guppies ( Poecilia reticulata ) undergoes yearly range shift cycle. Guppies are among most widespread inva...

Migration is common among populations of brown trout (Salmo trutta) and Atlantic salmon (Salmo salar). However, not all individuals in the same population migrate, a phenomenon referred to as partial migration. The aim of this thesis was to investigate if an individual’s behaviour and metabolic rate influences its decision to migrate and how such knowledge may be used when trying to produce hat...

Trading between conflicting demands is a fundamental part in how animals interact with its environment and social surrounding. Knowledge of what factors shaping trade-off decisions is central in our understanding of animal adaptation and ecology. This thesis summarizes a series of behavioural experiments investigating how animals compromise behaviours depending on environmental background and c...

Invasive alien species (IAS) are major drivers of global biodiversity loss, and the poorly regulated international pet trade is a source emerging future invaders. Predictions likely ecological impacts risks such IAS have been significantly enhanced in recent years with new metrics, which require application to many more actual potential IAS. Hence, this study assesses two readily available spec...

Early social environment can play a significant role in shaping behavioural development. For instance, in many social mammals and birds, isolation rearing results in individuals that are less exploratory, shyer, less social and more aggressive than individuals raised in groups. Moreover, dynamic aspects of social environments, such as the nature of relationships between individuals, can also im...

Individual variation in the way animals cope with stressors has been documented in a number of animal groups. In general, two distinct sets of behavioural and physiological responses to stress have been described: the proactive and the reactive coping styles. Some characteristics of stress coping style seem to be coupled to the time to emerge of fry from spawning redds in natural populations of...