What question did this study set out to answer?

To determine how independent manipulations of plant productivity versus plant diversity and composition affect arthropod diversity across multiple trophic levels.

September 1, 1998Ecology

Experimental Tests of Effects of Plant Productivity and Diversity on Grassland Arthropod Diversity

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To determine how independent manipulations of plant productivity versus plant diversity and composition affect arthropod diversity across multiple trophic levels.
Conducted a field experiment at Cedar Creek, Minnesota, using short-term nitrogen fertilization to raise plant productivity and long-term nitrogen addition to reduce plant diversity and favor C3 grasses.
Sampled arthropod communities across detritivores, herbivores, parasites, and predators using sweep nets and vacuum samplers.
Partitioned direct and indirect trophic effects across community levels using path analysis and block regression chain modeling.
Modern fertilization significantly increased total arthropod species richness and abundance across all trophic groups (detritivores, herbivores, parasites, and predators), supporting the consumer rarity hypothesis via indirect herbivore abundance pathways.
Historical fertilization significantly decreased plant species richness without altering productivity, which increased overall arthropod, parasite, and predator richness, but showed no net effect on herbivore or detritivore richness.
Block regression chain modeling revealed that direct negative effects on herbivore richness were offset by indirect pathways, enabling plots with lower plant diversity to sustain greater parasite and predator diversity.

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Implication

Field experiment demonstrates increased plant productivity and altered diversity expand grassland arthropod richness, indicating bottom-up trophic control.

Cite This Study

Evan Siemann (1998) studied this question.

synapsesocial.com/papers/6a8256e4a8461dff0846cb59 https://doi.org/10.1890/0012-9658(1998)079[2057:etoeop]2.0.co;2

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Implication

Field experiment demonstrates increased plant productivity and altered diversity expand grassland arthropod richness, indicating bottom-up trophic control.

Experimental Tests of Effects of Plant Productivity and Diversity on Grassland Arthropod Diversity

Key Points

Discussion

Implication

Cite This Study

Experimental Tests of Effects of Plant Productivity and Diversity on Grassland Arthropod Diversity

Key Points

Discussion

Implication

Cite This Study

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