Review biological disturbances and marine ecosystems

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An old digger at the bottom of the ocean has been getting fucked in the ass for years.

These prehistoric dirt loaders – different types of worms, trilobites, etc. animal It is believed that those who lived in Earth’s oceans hundreds of millions of years ago played an important role in creating the conditions necessary for marine life to thrive. Their activities changed the chemical composition of the ocean itself and the amount of oxygen in the ocean through the following processes. Biological disturbance..

But did biological disruption help or prevent the expansion of complex animal life? New beer research published in the journal Earth and planetary science letterThe underwater excavator has certainly been very useful.

Lydia Tahan, assistant professor of earth and planetary sciences at Yale University, said: “They play a major role in the formation of the atmosphere, even in the chemical makeup of the ocean, and even in the geological time scale. “

Biodisturbants that inhabit and dig holes in seabed sediments first spread and became active in the early Cambrian, about 541 million years ago. According to the fossil record, they were part of the so-called “Cambrian Explosion,” and most groups of animals with sophisticated body plans and behaviors began to emerge one after another.

However, there is a lot of debate among geoscientists about how these diggers affected their environment.

For example, there is a relationship between biodisturbance and the availability of phosphorus. It is an important nutrient necessary for all life. The availability of phosphorus determines the size of the global biosphere and the complexity of life it can support. Phosphorus reaches the seabed mainly in the form of plankton, and its corpses sink to the seabed after death and drain from the seawater that flows upward along the edges of the continent.

Most recent studies suggest that early diggers take phosphorus and refill it, effectively blocking the supply of this vital nutrient. The theory also suggests that biological disturbances alter the way carbon is buried beneath the ocean floor, leading to widespread reduction of oxygen in the water.

Another research institute on biological disturbances – Theory of evolution Observations from the fossil record provide a very different hypothesis. This theory believes that digging under the sea will be more biologically sophisticated in terms of the size and behavior of the animals.

“We have had these two main ideas for a long time, which are fundamentally opposed to each other, regarding the role of early animals in shaping the chemistry, habitat and ecology of the oceans,” said Tarhan. I go.

The new work of the Yale team is aimed at solving the problems.

For this study, Tarhan and his colleagues created a new model of phosphorus cycling and biological disturbance that more accurately describes the two processes. For example, she said previous models did not take into account the large amounts of phosphorus-rich minerals formed in the sediments. ocean floor. Likewise, previous modeling assumed that biological disturbance is an all-or-nothing activity that behaves like an on / off switch, rather than a gradual increase in behavior.

“Our work for the first time coordinated two major frameworks for the role of early animals in driving changes in the evolutionary and biogeochemical landscapes of Earth’s early oceans,” Tahan said. It was. “The first animals that dug pits fostered the emergence of increasingly productive and complex ecosystems, further facilitating the Cambrian explosion, rather than curbing or delaying their effects.”


The old earth charner took the time to stir the seabed


For more information:
Lidya G. Tarhan et al, Biological Disturbance Feedback on Phosphorus Cycle, Earth and planetary science letter (2021). DOI: 10.1016 / j.epsl.2021.116961

Provided by
Yale University

Quote: Revenge of the Undersea Digger: Looking at the Biological Disturbances and Marine Ecosystems (May 28, 2021) again, https: //phys.org/news/2021-05-revenge-seabed-burrowers- Obtained from bioturbation-ocean in May 28, 2021. html

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