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Related Experiment Video

Updated: Aug 13, 2025

Linking Predation Risk, Herbivore Physiological Stress and Microbial Decomposition of Plant Litter
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Megaherbivores modify forest structure and increase carbon stocks through multiple pathways.

Fabio Berzaghi1, François Bretagnolle2, Clémentine Durand-Bessart3

  • 1Laboratory of Climate and Environmental Sciences (LSCE) - Unité mixte de recherche Commissariat à l'énergie atomique et aux énergies alternatives, 91190, Gif-sur-Yvette, France.

Proceedings of the National Academy of Sciences of the United States of America
|January 23, 2023
PubMed
Summary
This summary is machine-generated.

Forest elephants boost tropical forest carbon by promoting high-density trees and dispersing their seeds. Their conservation is vital for climate change mitigation.

Keywords:
biogeochemical cyclescarbon cyclingmegafaunanature-based solutionsplant animal interactions

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Area of Science:

  • Ecology
  • Climate Science
  • Conservation Biology

Background:

  • Megaherbivores like forest elephants significantly impact ecosystem structure and function.
  • The precise mechanisms by which elephants influence aboveground carbon in African rainforests remain incompletely understood.

Purpose of the Study:

  • To elucidate the mechanisms through which African forest elephants affect aboveground carbon stocks.
  • To quantify the potential impact of forest elephant loss on forest carbon dynamics and composition.

Main Methods:

  • Combined a large unpublished dataset of forest elephant feeding behavior with extensive published browsing preference data (>200,000 records, >800 plant species).
  • Incorporated nutritional data for 145 plant species to analyze food selection drivers.
  • Modeled the effects of elephant presence and absence on tree community composition and carbon stocks.

Main Results:

  • Elephants promote high wood density trees by preferentially consuming palatable, low wood density species.
  • Seed dispersal by elephants favors large-seeded trees with high wood density, further enhancing carbon storage.
  • Loss of forest elephants is predicted to lead to an increase in low wood density trees and a 6-9% decrease in aboveground carbon.

Conclusions:

  • Forest elephants are crucial for maintaining high-carbon, diverse tropical forests.
  • Elephant conservation efforts directly contribute to climate change mitigation by preserving forest carbon stocks.
  • The ecological role of megaherbivores is essential for global climate regulation.