New evidence suggests that fluctuations in the Earth’s orbit may affect evolution

New evidence suggests that fluctuations in the Earth's orbit may affect evolution

As our habitat revolves around the sun, the current ring is slightly circular. However, the Earth’s orbit is not as stable as you might think.

Every 405,000 years, our planet’s orbit expands to 5% elliptical before returning to equilibrium.

We have long understood this cycle known as Orbital concentrationI.R. Promotes global climate change, But do not know exactly how it will affect life on Earth.

New evidence suggests that fluctuations in the Earth’s orbit may actually affect biological evolution.

A team of scientists led by paleontologist Luke Beaufort French National Research Center (CNRS) Evidence has been found that orbital eccentricity promotes the evolution of new species, at least in the photosynthetic variant of plankton (phytoplankton).

Coccolithophores These are microscopic algae that feed on sunlight and form limestone around the soft single-celled body. These perforated shells, called coccolites, are very common in our fossil sources – they first appeared about 215 million years ago. Years through the upper triangle.

These ocean storms are so abundant that they make a significant contribution to the earth’s nutrient cycles, and their changing forces can have a profound effect on our planet’s systems.

Beaufort and colleagues use automated artificial intelligence microscopy to measure 9 million coccyls in 2.8 million years of evolution in the Indo-Pacific. Using old waste marine samples, they were able to achieve an incredibly comprehensive resolution of nearly 2,000 years.

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Researchers have been able to use tail size limits to estimate the number of species, e.g. Previous genetic testing It has been confirmed that different species in the Noelaerhabdaceae family can be distinguished by their cell size.

They found an average cocolite length following a typical cycle suitable for an orbital cycle of 405,000 years. The largest mean tail size showed the smallest time delay after the maximum central deviation. It did not matter whether the earth was covered with snow or not.

“In the modern ocean, the largest variation of phytoplankton is in the equatorial range, which may be associated with high temperatures and stable conditions, and seasonal species change is greater than average latitudes due to strong seasonal temperature variations, explains Beaufort and colleagues. In your paper.

They found that the same pattern was reversed over the larger periods they studied. As the Earth’s orbit becomes elliptical, the seasons around the equator become clearer. These more diverse conditions led to the diversification of Cocolithophores into more species.

“As the seasons increase, the greater diversity of ecological spaces leads to more species, as adaptation of the Nolar Hobdaceae is characterized by changes in the size of the tail and the degree of calcification to thrive in the new environment.

Differences in the size of the caudal bone at different times: myosin (left), pleistocene (right). Follow your favorites

The latest evolutionary phase discovered by the team began about 550,000 years ago – a new radioactive event. jevirocapsa The classes came up. Beaufort and colleagues confirmed this interpretation using genetic data of living species today.

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Using data from the two oceans, they were also able to distinguish between local and global events.

In addition, by estimating the large accumulation rate in the waste samples, the researchers revealed the potential morphological effects of various species on the Earth’s carbon cycle, which can be modified through photosynthesis and the production of limestone shells (CaCO3).

Lightweight types (e.g. E. Huxley I.R. G. Caribbean) Cocolite is a major contributor to carbonate exports, Team books, Shows that when medium-sized opportunistic species dominate, low carbon is stored in the shells of dead animals.

In view of these and other consequences Ask for helpAccording to Beaufort and his team, the observed difference between orbital concentrations and climate change is that cochlear implants can “work instead of responding to changes in the carbon cycle”.

In other words, these tiny microbes, along with other phytoplankton, can help change the Earth’s climate in response to these tropical events. But more needs to be done to confirm this.

This study was published Controlled behavior.

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