Animals as architects of the earth: first global study reveals their surprising impact

EMBARGOED PRESS RELEASE: MONDAY 17 FEBRUARY 2025 3:00PM U.S. EASTERN TIME (8:00PM GMT)

Animals are not just inhabitants of the natural world—they are its architects. A new study led by Professor Gemma Harvey from Queen Mary University of London has revealed how hundreds of species shape the landscapes we depend on, from vast termite mounds visible from space to hippos carving drainage systems and beavers creating entire wetlands.

Published in Proceedings of the National Academy of Sciences (PNAS), this first-of-its-kind global synthesis identifies 603 species, genera, or families that influence Earth’s surface processes. From tiny ants shifting soil to salmon reshaping riverbeds, the study highlights the diversity and scale of animals’ impact across all freshwater and terrestrial ecosystems.

By estimating the collective energy of these “natural engineers,” the research shows that their geomorphic contributions rival those of hundreds of thousands of major floods.

Key Insights from the Study:

• Unexpected Diversity: Beyond iconic examples like beavers and salmon, the study identifies hundreds of species—including insects, mammals, fish, birds, and reptiles—that shape landscapes in remarkable ways.
• Freshwater Ecosystems in Focus: Despite covering just 2.4% of the planet’s surface, freshwater habitats host over a third of these remarkable species.
• Impressive Energy Output: Animals collectively contribute at least 76,000 gigajoules of energy annually to shaping the Earth’s surface—a figure comparable to hundreds of thousands of extreme floods. This estimate is likely conservative, as significant knowledge gaps exist, particularly in tropical and subtropical regions where biodiversity is highest but research is limited.
• Fascinating Examples: Termites build vast networks of mounds in Brazil, some covering thousands of square kilometres, while salmon spawning can shift as much sediment as annual flooding. Even ants, through their tiny but countless actions, alter soil structure and drainage.

Professor Harvey explains:
"This research shows that the role of animals in shaping Earth’s landscapes is much more significant that previously recognised.  From beavers creating wetlands to ants building mounds of soil, these diverse natural processes are crucial, yet we risk losing them as biodiversity declines."

Nearly 30% of the identified species are rare, endemic, or threatened, meaning vital geomorphic processes could cease before their full significance is understood. This loss could have profound consequences for ecosystems and the landscapes they support.

Looking Ahead:
This research provides new insights for biodiversity conservation and ecosystem restoration. Rewilding and species reintroduction projects, such as the reintroduction of beavers to restore wetlands, show how harnessing these natural processes could help combat environmental challenges like erosion and flooding.

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Notes to Editors:

• The article ‘Global diversity and energy of animals shaping the Earth’s surface’ is under PNAS embargo until Monday, Feb. 17 at 3 pm US ET. It is scheduled to publish on Tuesday, Feb. 18 due to the holiday in the US.

• PNAS provides journalists with access to content through EurekAlert!: https://www.eurekalert.org/news-releases/1073420

• After this article publishes, it will be available at: https://www.pnas.org/cgi/doi/10.1073/pnas.2415104122
  
   
• ‘Global diversity and energy of animals shaping the Earth’s surface’
  Authors: Gemma L. Harvey^1*, Zareena Khan¹, Lindsey K. Albertson², Martin Coombes³, Matthew F. Johnson⁴, Stephen P. Rice⁵, Heather A. Viles³

Affiliations: 1. School of Geography; Queen Mary University of London, London, UK. | 2. Department of Ecology, Montana State University, USA.| 3.School of Geography and the Environment, University of Oxford, UK. | 4. School of Geography, University of Nottingham, UK. | 5. Department of Natural Sciences, Manchester Metropolitan University, UK.

• High-resolution images and examples of animal-driven landscape changes, including beaver dams, ant mounds, salmon redds, are available upon request.
• For media enquiries or to arrange interviews with Professor Gemma Harvey, please contact James Cleeton, Faculty Communications Officer, at j.cleeton@qmul.ac.uk.

About Queen Mary University of London

At Queen Mary University of London, we believe that a diversity of ideas helps us achieve the previously unthinkable. Throughout our history, we’ve fostered social justice and improved lives through academic excellence – and we continue to live and breathe this spirit today, not because it’s simply ‘the right thing to do’ but for what it helps us achieve and the intellectual brilliance it delivers. 

A member of the prestigious Russell Group, Queen Mary is a research-intensive university that connects minds worldwide. We work across the humanities and social sciences, medicine and dentistry, and science and engineering, with inspirational teaching directly informed by our world-leading research. 

Our distinctive history stretching back to 1785 is built on four historic institutions (the London Hospital Medical College, St Bartholomew’s Medical College, Westfield College and Queen Mary College) with a shared vision to provide hope and opportunity for the less privileged or otherwise under-represented. Today, we remain true to that belief in opening the doors of opportunity for anyone with the potential to succeed and helping to build a future we can all be proud of. 

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