Individual Behavior

Individual animal behavior has the potential to influence the probability of mortality regardless of the evolutionary prediction of the species' survivorship curve. For example, dominance hierarchies or kin selection may improve the survival and fitness of a few individuals. Mortality is reduced in other species by living in groups. Through this behavior, group membership will have increased vigilance for predators (the 'many eyes' hypothesis). Additionally, if group vigilance is higher, single individuals can spend more time feeding (thereby increasing their physiological fitness) rather than scanning for predators. However, as group size increases, aggression over scarce resources will define the upper group size observed. Consequently, an 'optimal group size' exists where mortality is lower than in very small or very large groups (Figure 2).

Figure 2 The influence of group size on mortality. Group size is generally found to occur within a range of 1 to n individuals with an 'optimal group size' that maximizes benefits and lowers individual mortality.
Project Earth Conservation

Project Earth Conservation

Get All The Support And Guidance You Need To Be A Success At Helping Save The Earth. This Book Is One Of The Most Valuable Resources In The World When It Comes To How To Recycle to Create a Better Future for Our Children.

Get My Free Ebook


Post a comment