The bar graph illustrates changes in the populations of seals, whales, and dolphins in Georgia Strait across four time points: 2006, 2010, 2014, and 2018. As shown on the y-axis, the populations are measured in units from 0 to 60 animals, increasing in intervals of ten.
At first glance, it is clear that the dolphin population increased steadily over the entire period. In contrast, the seal population experienced fluctuations, while the whale population remained relatively stable. Overall, 2010 recorded the lowest total number of sea mammals, whereas 2018 had the highest.
In more detail, the dolphin population started at around 17 in 2006. It rose to approximately 22 in 2010, increased by another 10 in 2014, and reached a peak of 52 in 2018, making it the most populous species in the final year. Seals began with the highest population of 43 in 2006, but this dropped significantly to 25 by 2010. Their numbers then rose to 35 in 2014 and slightly increased again to 45 in 2018.
Whale numbers remained relatively consistent throughout the period, hovering around the mid-20s. The lowest overall sea mammal count occurred in 2010, with an average of about 23 animals across all species. In contrast, 2018 showed the highest total, with an average of roughly 40.