Rapid top-down regulation of plant C: N:P stoichiometry by grasshoppers in an Inner Mongolia grassland ecosystem

Guangming Zhang, Xingguo Han, James Elser

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Understanding how food web interactions alter the processing of limiting nutrient elements is an important goal of ecosystem ecology. An experiment manipulating densities of the grasshopper Oedaleus asiaticus was performed to assess top-down effects of grasshoppers on C:N:P stoichiometry of plants and soil in a grassland ecosystem in Inner Mongolia (China). With increased grasshopper feeding, plant biomass declined fourfold, litter abundance increased 30%, and the plant community became dominated by non-host plant taxa. Plant stoichiometric response depended on whether or not the plant was a grasshopper host food species: C:N and C:P ratios increased with increasing grasshopper density (GD) for host plants but decreased in non-host plants. These data suggest either a direct transfer of grasshopper-recycled nutrients from host to non-host plants or a release of non-host plants from nutrient competition with heavily grazed host plants. Litterfall C:N and C:P decreased across moderate levels of grasshopper density but no effects on C:N:P stoichiometry in the surface soil were observed, possibly due to the short experimental period. Our observations of divergent C:N:P stoichiometric response among plant species highlight the important role of grasshopper herbivory in regulating plant community structure and nutrient cycling in grassland ecosystems.

Original languageEnglish (US)
Pages (from-to)253-264
Number of pages12
JournalOecologia
Volume166
Issue number1
DOIs
StatePublished - May 2011

Fingerprint

grasshopper
stoichiometry
grasshoppers
grasslands
China
ecosystems
host plant
plant response
nutrient
plant community
plant communities
Oedaleus
nutrients
host plants
grassland ecosystem
regulation
grassland soils
litterfall
nutrient cycling
herbivory

Keywords

  • Grasshopper outbreak
  • Herbivory
  • Nutrient cycling
  • Steppe
  • Stoichiometry

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Rapid top-down regulation of plant C : N:P stoichiometry by grasshoppers in an Inner Mongolia grassland ecosystem. / Zhang, Guangming; Han, Xingguo; Elser, James.

In: Oecologia, Vol. 166, No. 1, 05.2011, p. 253-264.

Research output: Contribution to journalArticle

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