Heavy livestock grazing promotes locust outbreaks by lowering plant nitrogen content

Arianne Cease, James Elser, Colleen F. Ford, Shuguang Hao, Le Kang, Jon Harrison

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

Current paradigms generally assume that increased plant nitrogen (N) should enhance herbivore performance by relieving protein limitation, increasing herbivorous insect populations. We show, in contrast to this scenario, that host plant N enrichment and high-protein artificial diets decreased the size and viability of Oedaleus asiaticus, a dominant locust of north Asian grasslands. This locust preferred plants with low N content and artificial diets with low protein and high carbohydrate content. Plant N content was lowest and locust abundance highest in heavily livestock-grazed fields where soils were N-depleted, likely due to enhanced erosion. These results suggest that heavy livestock grazing and consequent steppe degradation in the Eurasian grassland promote outbreaks of this locust by reducing plant protein content.

Original languageEnglish (US)
Pages (from-to)467-469
Number of pages3
JournalScience
Volume335
Issue number6067
DOIs
StatePublished - Jan 27 2012

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Grasshoppers
Livestock
Disease Outbreaks
Nitrogen
Protein-Restricted Diet
Plant Proteins
Herbivory
Insects
Proteins
Soil
Carbohydrates
Diet
Population
Grassland

ASJC Scopus subject areas

  • General

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Heavy livestock grazing promotes locust outbreaks by lowering plant nitrogen content. / Cease, Arianne; Elser, James; Ford, Colleen F.; Hao, Shuguang; Kang, Le; Harrison, Jon.

In: Science, Vol. 335, No. 6067, 27.01.2012, p. 467-469.

Research output: Contribution to journalArticle

Cease, Arianne ; Elser, James ; Ford, Colleen F. ; Hao, Shuguang ; Kang, Le ; Harrison, Jon. / Heavy livestock grazing promotes locust outbreaks by lowering plant nitrogen content. In: Science. 2012 ; Vol. 335, No. 6067. pp. 467-469.
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