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Insect Declines in the Anthropocene.

David L Wagner1

  • 1Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, Connecticut 06269, USA;

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Summary
This summary is machine-generated.

Global insect declines threaten ecosystems, impacting biodiversity and essential services. Urgent monitoring is needed to understand causes like habitat loss, pesticides, and climate change, alongside less-considered factors such as atmospheric nitrification.

Keywords:
agricultural intensificationbeesclimate changedroughtinsect declinepollinator declineprecipitation extremesvertebrate insectivores

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Area of Science:

  • Ecology and Conservation Biology
  • Entomology
  • Environmental Science

Background:

  • Widespread insect declines reported globally across flying, ground, and aquatic species.
  • Focus on population declines, particularly of abundant species crucial for trophic interactions and ecosystem services.
  • Existing data primarily from well-studied regions like Europe, with emerging reports from other continents.

Purpose of the Study:

  • To review factors contributing to observed insect population collapses.
  • To identify widely recognized and less commonly considered threats to insect biodiversity.
  • To highlight the urgent need for enhanced insect monitoring and data collection.

Main Methods:

  • Comprehensive literature review of scientific reports on insect declines.
  • Analysis of factors implicated in insect population losses, including habitat destruction, agricultural intensification (pesticides), climate change, and invasive species.
  • Consideration of less-recognized factors like atmospheric nitrification and altered precipitation patterns.

Main Results:

  • Insect declines are a global phenomenon affecting diverse lineages.
  • Key threats include habitat loss, intensive agriculture, climate change, and invasive species.
  • Emerging concerns include atmospheric nitrification and drought impacts; data gaps hinder full understanding.

Conclusions:

  • Urgent, widespread monitoring is essential to determine the geographic extent and magnitude of insect declines.
  • Identifying causal factors requires research across ecological gradients.
  • Addressing threats to insect populations is critical for maintaining ecosystem stability and services.