Saturday, December 4, 2021

Loss Of Ancient Grazers Triggered A Global Rise In Fires

Grazing populations and fire frequency are likely related but we also lack clarity as much of this is far more subtle than we initially think.

In our own world, cattle can nicely suppress gras and if pfroperly managed this can double the natural stocking rate.. Integrating sheep or goats allows shrub cover to be managed along with weed plants for cattle.  So just for a proper sustainable range operatilon we need at least two separate grazers.

Under the Mastodon, Mammoth culture, we find that trees and shrub  are harvested likely in preference to grass and odds are the pine forests were consumed.  Today we do not know just how it all fit together, except it succeeded in hte boreal forest and this needs to be replicated.

We can start with elephants properly protected.

Loss Of Ancient Grazers Triggered A Global Rise In Fires

From 50,000 years to 6,000 years ago, many of the world's largest animals, including such iconic grassland grazers as the woolly mammoth, giant bison, and ancient horses, went extinct. The loss of these grazing species triggered a dramatic increase in fire activity in the world's grasslands, according to a new Yale-led study published in the journal Science.

The Age of Mammals, a mural by Rudolph F. Zallinger [Credit: © 2016 Peabody Museum
of Natural History, Yale University]

In collaboration with the Utah Natural History Museum, Yale scientists compiled lists of extinct large mammals and their approximate dates of extinctions across four continents. The data showed that South America lost the most grazers (83% of all species), followed by North America (68%). These losses were significantly higher than in Australia (44%) and Africa (22%).

They then compared these findings with records of fire activity as revealed in lake sediments. Using charcoal records from 410 global sites, which provided a historical record of regional fire activity across continents, they found that fire activity increased after the megagrazer extinctions. Continents that lost more grazers (South America, then North America) saw larger increases in fire extent, whereas continents that saw lower rates of extinction (Australia and Africa) saw little change in grassland fire activity.

"These extinctions led to a cascade of consequences," said Allison Karp, a postdoctoral associate in Yale's Department of Ecology & Evolutionary Biology and corresponding author of the paper. "Studying these effects helps us understand how herbivores shape global ecology today."

Widespread megaherbivore extinctions had major impacts on ecosystems -- ranging from predator collapse to loss of fruit-bearing trees that once depended on herbivores for dispersal. But Karp and senior author Carla Staver, associate professor of ecology and evolutionary biology in Yale's Faculty of Arts and Sciences, wondered if there was also an increase in fire activity in the world's ecosystems, specifically due to a buildup of dry grass, leaves, or wood caused by the loss of giant herbivores. They found that, in grasslands, grass-fueled fires increased.

However, Karp and Staver note that many ancient browser species -- such as mastodons, diprotodons, and giant sloths, which foraged on shrubs and trees in wooded areas -- also went extinct during the same period but that their losses had less impact on fires in wooded areas.

Grassland ecosystems across the world were transformed after the loss of grazing-tolerant grasses due to the loss of herbivores and increase in fires. New grazers, including livestock, eventually adapted to the new ecosystems.

That's why scientists should consider the role of grazing livestock and wild grazers in fire mitigation and climate change, the authors said. "This work really highlights how important grazers may be for shaping fire activity," Staver said. "We need to pay close attention to these interactions if we want to accurately predict the future of fires."

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