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“They found that evolutionarily and functionally distinct communities emerged at each of the temperature conditions, driven by the resuscitation of microbial strains that had been inactive under previous environmental conditions. This suggests that – rather than new bacteria moving into a community to suit the new conditions – the parent community harbours multiple bacterial strains that are pre-adapted to survive at different temperatures and can switch on when their preferred temperature is reached. As a result, microbial communities in nature are likely to be able to respond rapidly to temperature fluctuations.”
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“One of the most important biological discoveries in the last century is that evolution can happen much more quickly than previously thought,” says Brian Cheng, professor of marine ecology at the University of Massachusetts Amherst and the paper’s senior author. “One of the implications of this is that different populations of the exact same species can adapt to their local environments more readily than traditional biology would have thought possible.”
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"Combining data from the long-term Hawai’i Ocean Time-series program with new climate model simulations conducted on one of South Korea’s fastest supercomputers, the scientists revealed that a mechanism, known as nutrient uptake plasticity, allows marine algae to adapt and cope with nutrient-poor ocean conditions expected to occur over the next decades in response to global warming of the upper ocean.
"Phytoplankton are tiny algae which drift at the ocean’s surface and form the basis of the marine food web. While photosynthesizing, these algae absorb nutrients (e.g., phosphate, nitrate), take up dissolved carbon dioxide and release oxygen, which makes up for about 50% of the oxygen that we breathe. Knowing how marine algae will respond to global warming and to associated decline of nutrients in upper ocean waters is therefore crucial for understanding the long-term habitability of our planet…
"To study how this unique metabolic “hack” will impact global ocean productivity over the next few decades, the team ran a series of climate model simulations with the Community Earth System model (version 2, CESM2) on their supercomputer Aleph. By turning off the phytoplankton plasticity in their model, the authors were able to qualitatively reproduce previous model results of a decline in global productivity by about 8%. However, when turning on the plasticity parameter in their model, in a way that captures the observations near Hawai’i for the past 3 decades, the computer simulation reveals an increase in global productivity of up to 5%
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