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Related Experiment Video

Updated: Dec 29, 2025

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates
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The megabiota are disproportionately important for biosphere functioning.

Brian J Enquist1,2, Andrew J Abraham3, Michael B J Harfoot4

  • 1Department of Ecology and Evolutionary Biology, University of Arizona, Arizona, AZ 85721, USA. benquist@email.arizona.edu.

Nature Communications
|February 6, 2020
PubMed
Summary
This summary is machine-generated.

The largest plants and animals (megabiota) face extinction due to human activities and climate change. Losing megabiota severely harms ecosystem function and biosphere health, impacting biomass, metabolism, and fertility.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Metabolic Theory

Background:

  • Megabiota (large animals and plants) are declining, signaling the Anthropocene.
  • A predictive framework is needed to understand megabiota sensitivity to global change and their ecosystem impact.

Purpose of the Study:

  • To develop a predictive framework for megabiota sensitivity and ecosystem impacts.
  • To quantify the effects of megabiota loss on ecosystem functioning and the biosphere.

Main Methods:

  • Extending metabolic scaling theory.
  • Utilizing global simulation models to assess extinction risks and ecosystem impacts.

Main Results:

  • Megabiota are highly vulnerable to human land use, hunting, and climate change.
  • Loss of megabiota negatively impacts ecosystem metabolism, functioning, biomass, and fertility.
  • Continued megabiota reduction significantly decreases biosphere functioning.

Conclusions:

  • Policies promoting large trees and animals are crucial for biodiversity, ecosystem processes, and climate mitigation.
  • Megabiota play a disproportionately large role in maintaining planetary health.