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Research reveals location and intensity of global threats to biodiversity

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Using a novel modelling approach, new research published today in Nature Ecology and Evolution reveals the location and intensity of key threats to biodiversity on land and identifies priority areas across the world to help inform conservation decision making at national and local levels.

A team of leading researchers have produced global maps for the six main threats affecting terrestrial amphibians, birds and mammals: agriculture, hunting and trapping, logging, pollution, invasive species, and climate change. Results show that agriculture and logging are pervasive in the tropics and that hunting and trapping is the most geographically widespread threat to mammals and birds. There are sizeable continental areas in which there is more than a 50% chance that any particular amphibian, mammal or bird species is threatened by logging, hunting and trapping, agriculture, invasive species or climate change.

The world is facing a global nature crisis, yet information about the location and intensity of the threats responsible for biodiversity loss remains limited. Information on the spatial intensity of threats and how they affect species on the ground is critically important to improving and targeting conservation responses. This study presents both a first attempt to map this information and a research track to improve our understanding of how threats to biodiversity vary across the world.

Using the IUCN Red List to map threats to terrestrial vertebrates at global scale identifies the most prevalent threat for each taxa. It finds that agriculture is the greatest threat to amphibians, being the most prevalent threat to these species across 44% of global lands. For birds and mammals, hunting and trapping is most prevalent, ranking as the highest threat across 50% of land for birds and 73% of land for mammals. Agriculture is the most prevalent threat for amphibians, mammals, and birds combined.

The research also identifies locations where threats are particularly prevalent. In Southeast Asia, particularly the islands of Sumatra and Borneo, as well as Madagascar, there is a high risk of impact from all six threats to amphibians, birds, and mammals. For amphibians, Europe stood out as a region of high threat impact due to a combination of agriculture, invasive species and pollution. Polar regions, the east coast of Australia and South Africa are mostly likely to be impacted by climate change, affecting birds in particular.

Dr. Mike Harfoot, one of the two lead authors of the paper, UN Environment Programme World Conservation Monitoring Centre (UNEP-WCMC), says: “We are facing a global nature crisis, and the next ten years is a crucial window for taking decisive action to tackle biodiversity loss. Our results reveal the location and intensity of human-caused threats to nature. This information can support decision-makers at a range of levels in identifying where action to reduce these threats could yield the best results for people and planet. With further work, we will improve this information in terms of accuracy and the breadth of nature considered.”