Figure 2. (Top) Annual trend of large shark species richness as inferred from the slope of a linear regression of average number of species upon year on a series of randomly selected hauls in each year. Open circles depict number of species observed during a year. Dashed lines indicate centred 95% confidence intervals. (Bottom) Generalized additive model derived effects of the investigated parameters on the binomial probability of encountering large sharks. Dashed lines indicate two standard errors above and below the estimates.