The graph delineates the population figures of four distinct species of turtles residing in India between 1980 to 2012, encompassing leatherback turtles, green turtles, olive ridley turtles, and all species.
It is noteworthy that the index commences at the same value of 100 for all four categories. Remarkably, the olive ridley turtles outperform their counterparts throughout the timeperiod observed with their index depictng a steady rise till 1996 at a value of 135. Thereafter, experiencing fluctuation up until the year 2012.
In contrast, the index of leatherback turtles observes a stark decline, reaching their nadir in 2012 at a value of 60. Moreover, the all species category is illustrated to be plateaued across the period with subtle variation. Green turtles also depict a comparable trend, albeit at lower index values.
In conclusion, the index value of olive ridley turtles maintain their dominance throught the depicted timeframe. While green turtles and all species show a similar pattern of stagnancy, leatherback turtles demonstrate a steep downward pattern. This can be attributed to a disruption in their ecosystem.