The bar graph depicts the variation of seal, whale, and dolphin populations from 2006 to 2018, with 4-year intervals, in the Georgia Strait. As reflected by the y-axis, population is measured from 0 to 60, with intervals of 10.
At first glance, it is clear that the dolphin population grew significantly from one time interval to another, while the seal population decreased and increased, and the whale population remained relatively stable. Overall, the least population of these sea mammals was recorded in 2010 and the highest in 2018.
In more detail, dolphins numbered around 16 in 2006, increased by 5 in 2010, 10 more in 2014, and became the highest population of all three creatures in 2018, at a whopping 50 dolphins. Seals were numerically dominant in 2006 among the other two mammals, then decreased to nearly half in 2010 and increased in the next two time periods, to 33 in 2014 and 43 in 2018. Whales, on the other hand, remained relatively stable during these time periods. Furthermore, the greatest number of mammals was recorded in 2018, with an average of 40, and similarly, the least in 2010, with an average of 20. In summary, the populations of these intelligent aquatic mammals are seen to be different, fluctuating, increasing, and stable.