The bar graph illustrates changes in the populations of three marine mammals – seals, whales and dolphins – in the Georgia Strait over four specific years: 2006, 2010, 2014 and 2018. The figures for each species are measured on a scale from 0 to 60 animals.
Engnovate
Overall, the data reveal that dolphin numbers grew consistently throughout the period, seals experienced an initial decline followed by marked growth, and the whale population showed relatively minor variation. By the end of the period, dolphins had become the most numerous species.
Engnovate
In more detail, in 2006 dolphins had the lowest population among the three species, at around 17, but their numbers increased steadily at each interval, reaching approximately 52 by 2018. Over the same period, seals began with a relatively high count of about 43 in 2006, but declined sharply to roughly 25 by 2010. This was followed by significant increases in 2014 and 2018, ending at around 45 seals. In contrast, whales exhibited the most stable pattern, with only modest changes; their population remained near the mid‑20s throughout the 12‑year period.