The given bar chart provides information about the population of 3 types of marine mammal species, specifically seals, whales and dolphins in Gormez Straits in 12 years divided into 4 sections.
Overall, dolphin population saw an upward growth till the end, while the number of seals and whales fluctuated each 4 years. Moreover, 2018 was the peak year for all 3 animal groups as they were recorded most in that year.
Looking at the first 4-year period, from 2006 to 2010, it is clear that seals outnumbered both whales and dolphins. However, after 2010, seals decreased in number, from more than 40 to around 25, whereas whales and dolphins experienced a slight increase.
In third and fourth 4-year periods, all animal species’ population rose to the maximum, with numbers 35 in 2014 and 45 in 2018 accounting for seals; 25 in 2014 and nearly 30 in 2018 for whales; and approximately 33 in 2014 and more than 50 in 2018.