![]() ![]() ![]() Thus, when Earth’s orbit is more circular, as is the case today (this is known as low eccentricity), the equatorial regions show little seasonal variation, and species that are not very specialized dominate all the oceans.Ĭonversely, as eccentricity increases and more pronounced seasons appear near the equator, coccolithophores diversify into many specialized species, but collectively produce less limestone. They also propose a cause: the more or less circular shape of Earth’s orbit around the Sun, which varies at the same rhythms. ![]() The researchers observed that coccoliths underwent cycles of higher and lower diversity in size and shape, with rhythms of 100 and 400 thousand years. Coccolithophores, an important constituent of the plankton, evolved following the rhythm of Earth’s orbital eccentricity. ![]()
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