Climate change claims hundreds of species in local extinctions

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Climate change has already caused hundreds of small-scale localised extinctions of plant and animal species around the world, according to a US study. The author found that local extinctions (when a species no-longer lives in a specific area, but can still be found elsewhere) have happened in warmer regions for over 450 species - almost half of those surveyed - as they up and leave to head for cooler climes. These extinctions will become more widespread over time, as climate change is expected to warm the Earth by an extra 1 - 5°C, on top of the 1°C already recorded, he says, adding that these local extinctions could soon affect species that we depend on for food and resources.

Journal/conference: PLOS Biology

Organisation/s: University of Arizona, USA

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From: PLOS

Climate change is already causing widespread local extinction in plant and animal species

Extinctions related to climate change have already happened in hundreds of plant and animal species around the world.  New research, publishing on December 8th in the open-access journal PLOS Biology, shows that local extinctions have already occurred in 47% of the 976 plant and animal species studied.

Climate change is predicted to threaten many species with extinction, but determining how species will respond in the future is difficult.  Dozens of studies have already demonstrated that species are shifting their geographic ranges over time as the climate warms, towards cooler habitats at higher elevations and latitudes.  The new study, by Professor John J. Wiens from the University of Arizona, used these range-shift studies to show that local extinctions have already happened in the warmest parts of the ranges of more than 450 plant and animal species.  This result is particularly striking because global warming has increased mean temperatures by less than 1 degree Celsius so far.  These extinctions will almost certainly become much more widespread over time, because temperatures are predicted to increase by an additional 1 to 5 degrees in the next several decades.  These local extinctions could also extend to species that humans depend on for food and resources.

The study also tested the frequency of local extinction across different regions, habitats, and groups of organisms.  It found that local extinctions occurred in about half of the species surveyed across different habitats and taxonomic groups.  However, the results showed that local extinctions varied by region and were almost twice as common among tropical species as among temperate species.  This is important as the majority of plant and animal species live in the tropics. The results of this study contribute to our understanding of how plants and animals will respond to global climate change and highlight the need to slow and prevent further warming.

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