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Washington [US], May 16 : Surveying the body sizes of Earth's living organisms, researchers from McGill University and the University of British Columbia found that the planet's biomass the material that makes up all living organisms is concentrated in organisms at either end of the size spectrum.The researchers spent five years compiling and analyzing data about the size and biomass of every type of living organism on the planet from tiny one-celled organisms like soil archaea and bacteria to large organisms like blue whales and sequoia trees.They found that the pattern favouring large and small organisms held across all types of species and was more pronounced in land-based organisms than in marine environments. Interestingly, maximum body size seemed to reach the same upper limits across multiple species and environments."Trees, grasses, underground fungi, mangroves, corals, fish, and marine mammals all have similar maximum body sizes. This might suggest that there is a universal upper size limit due to ecological, evolutionary, or biophysical limitations," says lead author Eden Tekwa, a former postdoctoral fellow at University of British Columbia and now a research associate with McGill University's department of biology."Life constantly amazes us, including the incredible range of sizes that it comes in," says co-author Malin Pinsky, an associate professor in the department of ecology, evolution, and natural resources at Rutgers University. "If the tiniest microbe was the size of the period at the end of this sentence, the largest living organism, a sequoia tree, would be the size of the Panama Canal.""As for humans, we already know we comprise a relatively small biomass, but our size among all living things reveals our place in the global biome. We belong to the size range that comprises the highest biomass, which is a relatively large body size," says Tekwa.Predicting the effects of climate changeCataloguing which body sizes are most common is a key step towards understanding the world around us, say the authors. These results also have important implications for predicting the impacts of climate change and human activity on the planet's biomass."For example, fish biomass is probably half of what it was before humans arrived, but it gets harder and harder to infer those patterns as we go farther back in time," says Tekwa. "We need to think about how the distribution of body size biomass will change under environmental pressures."Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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