Global species loss could be halved

Global species loss could be halved
The beautiful and rare woody iris Witsenia marua is only found in the Cape Peninsula of South Africa, and is the only species in the genus. Credit: Jon Lovett

Extinction risk could decrease by more than 50% if at least 30% of land were to be conserved across the tropics, a new study reveals.

The paper, authored by 21 and climate change scientists including Professor Jon Lovett from Leeds, finds increased paired with efforts to limit global warming to two degrees Celsius offers the best chance to slow species loss.

The study, published today in Ecography, is the first to analyse rates in the context of conservation and climate change.

Key findings from the paper include:

  • Conserving 30% of land area cuts in half across all known tropical vascular plants, birds and mammals;
  • Avoiding extinctions results in healthy ecosystems that provide many services critical to people, including maintaining key carbon stores that mitigate against climate change;
  • Future conserved lands need to account for shifts in species location and agricultural land suitability that are the result of climate change, especially in higher elevation landscapes.

Professor Lovett, study co-author and Chair in Global Challenges in the School of Geography, said: "Protection of land also needs to include agriculture, forestry and ranching.

"Ecologically-based agriculture is highly productive, and this approach can complement traditional types of conservation.

"We need to make a rapid transition from green agricultural deserts to verdant oases that combine economic productivity with movement and habitat of species affected by change. Our study shows where this needs to be done."

Global species loss could be halved
Cape buffalo at the Nuwejaars Wetlands Special Management Area in the Western Cape of South Africa, where 25 landowners are working together to protect water resources and wildlife on 46,000 hectares of the Agulhas Plain. Credit: Jon Lovett

The findings, revealed at the World Biodiversity Forum in Davos, come at a critical time as the global conservation community meets in Rome this week to continue negotiations on the Zero Draft of the Post-2020 Global Biodiversity Framework ahead of the Conference of Parties to the Convention on Biological Diversity next October in Kunming, China.

The goals and targets to be agreed upon at the Conference will serve as an important road map guiding conservation efforts for the next 10 years—the period in which scientists agree we must slow global warming, protect ecosystems and biodiversity.

Lee Hannah, lead author and senior scientist at Conservation International's Moore Center for Science, said: "2020 is the 'Super Year for Nature' and existing research shows we are on the verge of a sixth mass extinction if we do not commit to increased conservation efforts.

"The good news is that we now have science to guide actionable solutions to this crisis. If we collectively prioritise key areas for conservation we can preserve biodiversity hotspots and slow at the same time. It's a win-win model."

The international group of study authors support the proposed inclusion of a target calling for 30% protection of land area and 30% protection of ocean area. The results of the Ecography study show the positive impact this 30% threshold for land conservation will have on species loss. In fact, it could help reduce extinction risk twofold, including extinctions that are fuelled by .

"Climate change and species loss are largely human-driven despite the fact that we need stable temperatures and healthy ecosystems to thrive," said Patrick Roehrdanz, co-author and scientist at Conservation International.

"Understanding the way these pressing issues are interconnected is key to implementing effective conservation solutions before it's too late."

Preventing extinction and identifying the ecosystems that should be prioritised for investments can be complicated. To assist with this, the paper also provides maps and spatial planning to help illustrate locations across the Afrotropics, Neotropics and Asia Tropics that if protected could most effectively reverse currently predicted extinction rates.

More information: Lee Hannah et al. 30% land conservation and climate action reduces tropical extinction risk by more than 50%, Ecography (2020). DOI: 10.1111/ecog.05166

Journal information: Ecography

Citation: Global species loss could be halved (2020, February 26) retrieved 27 February 2024 from
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