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Published on: May 6, 2010
Cow-dung colonization and decomposition following insect exclusion
1School of Biological Sciences, University of Bristol, Woodland Road, Bristol, BS8 1UG, UK.
Bulletin of Entomological Research
|June 14, 2006
Summary
Insect exclusion significantly slows dung pat degradation. Even two days of covering cow pats reduced insect populations and decomposition rates, highlighting the crucial role of invertebrates in pasture ecosystems.
Area of Science:
- Ecology
- Soil Science
- Entomology
Background:
- Dung pats are important nutrient sources in pastures.
- Insect activity significantly influences dung pat decomposition rates.
Purpose of the Study:
- To quantify the rate of dung pat degradation in cattle pastures.
- To assess the impact of colonizing insects on dung pat decomposition.
Main Methods:
- Standardized artificial cow pats were used to measure degradation rates (ash-free dry weight).
- Insect access was manipulated using fine mesh cages for varying durations (0, 2, 7, 14 days).
- Invertebrate communities within pats were analyzed, with a focus on Aphodius larvae.
Main Results:
- Dung pat disappearance was faster in spring than summer.
- Covered pats (excluding insects) showed significantly higher ash-free dry weight loss compared to uncovered pats.
- Aphodius larvae abundance was highest in uncovered or 2-day covered pats, decreasing with longer exclusion periods.
Conclusions:
- Excluding insects for even two days post-deposition significantly reduces dung pat degradation.
- Aphodius larvae play a critical role in the rapid decomposition of cattle dung.
- Insects are essential for efficient nutrient cycling in cattle pastures.
