The graph illustrates the population trends of different types of turtles in India from 1980 to 2012. The data is presented in the form of an index, where the year 1980 is taken as the base (100).
Overall, it is clear that while the population of all turtle species combined remained relatively stable throughout the period, there were significant differences among the individual species. The population of Olive Ridley turtles showed a sharp decline, whereas Leatherback turtles experienced the most consistent growth.
In 1980, all four categories started at the same point. Over time, the population of Olive Ridley turtles dropped drastically, falling to around 60 by 2012. In contrast, Leatherback turtles steadily increased in number, peaking at nearly 135 in the late 1990s before slightly declining but still remaining above 120 by the end of the period.
Green turtles showed some fluctuations, with a small decrease between 1988 and 2000, but their population remained relatively stable afterwards, staying just under the starting index. The trend for all species combined was more stable, staying close to the 100 mark, with a slight upward trend visible towards 2012.
In conclusion, while some turtle populations remained steady or grew slightly, the Olive Ridley turtle population experienced a significant drop, indicating potential environmental or conservation challenges.