Study: One-Third of Plant and Animal Species Could Be Gone in 50 Years
A new study by University of Arizona researchers presents detailed estimates of global extinction from climate change by 2070. By combining information on recent extinctions from climate change, rates of species movement and different projections of future climate, they estimate that one in three species of plants and animals may face extinction. Their results are based on data from hundreds of plant and animal species surveyed around the globe.
To estimate the rates of future extinctions from climate change, Cristian Román-Palacios and John J. Wiens, both in the Department of Ecology and Evolutionary Biology at the University of Arizona, looked to the recent past. Specifically, they examined local extinctions that have already happened, based on studies of repeated surveys of plants and animals over time.
Román-Palacios and Wiens analyzed data from 538 species and 581 sites around the world. They focused on plant and animal species that were surveyed at the same sites over time, at least 10 years apart. They generated climate data from the time of the earliest survey of each site and the more recent survey. They found that 44% of the 538 species had already gone extinct at one or more sites.
A dead Alligator Juniper from Arizona. Unable to cope with rising temperature extremes, repeated surveys have shown that this species is literally being pushed up the mountain slopes under the impact of climate change.
Credit: Ramona Walls
The study identified maximum annual temperatures — the hottest daily highs in summer — as the key variable that best explains whether a population will go extinct. Surprisingly, the researchers found that average yearly temperatures showed smaller changes at sites with local extinction, even though average temperatures are widely used as a proxy for overall climate change.
“This means that using changes in mean annual temperatures to predict extinction from climate change might be positively misleading,” Wiens said.
Previous studies have focused on dispersal — or migration to cooler habitats — as a means for species to “escape” from warming climates. However, the authors of the current study found that most species will not be able to disperse quickly enough to avoid extinction, based on their past rates of movement. Instead, they found that many species were able to tolerate some increases in maximum temperatures, but only up to a point. They found that about 50% of the species had local extinctions if maximum temperatures increased by more than 0.5 degrees Celsius, and 95% if temperatures increase by more than 2.9 degrees Celsius.
Projections of species loss depend on how much climate will warm in the future.
“In a way, it’s a ‘choose your own adventure,’” Wiens said. “If we stick to the Paris Agreement to combat climate change, we may lose fewer than two out of every 10 plant and animal species on Earth by 2070. But if humans cause larger temperature increases, we could lose more than a third or even half of all animal and plant species, based on our results.”
The paper’s projections of species loss are similar for plants and animals, but extinctions are projected to be two to four times more common in the tropics than in temperate regions.
“This is a big problem, because the majority of plant and animal species occur in the tropics,” Román-Palacios said.
The research paper, “Recent responses to climate change reveal the drivers of species extinction and survival,” is published in PNAS: https://www.pnas.org/content/early/2020/02/04/1913007117
Contacts and sources:
Daniel Stolte
Publication: “Recent responses to climate change reveal the drivers of species extinction and survival,” http://dx.doi.org/10.1073/pnas.1913007117
Source: http://www.ineffableisland.com/2020/02/study-one-third-of-plant-and-animal.html
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