Increasing temperatures reduce invertebrate abundance and slow decomposition.

Area of Science:

• Ecology
• Climate Change Biology
• Ecosystem Services

Background:

• Decomposition is a critical ecosystem service influenced by biotic and abiotic factors.
• Climate change-induced warming affects soil conditions and fauna, potentially altering decomposition rates.
• Understanding climate change impacts on decomposition is vital for predicting nutrient cycling and ecosystem health.

Purpose of the Study:

• To experimentally investigate how early-stage decomposition varies under projected climate change scenarios.
• To assess the effect of invertebrate exclusion on leaf litter breakdown along a temperature gradient.

Main Methods:

• Experimental manipulation using litterbags in warming chambers to simulate climate change.
• Gradient of projected climate change scenarios applied.
• Invertebrate exclusion treatments implemented.
• Red maple (Acer rubrum) leaf litter used for breakdown measurements over five weeks.
• Structural equation modeling used to disentangle temperature and invertebrate effects.

Main Results:

• Leaf litter decomposition was slower in warmer chambers and when invertebrate access was minimized.
• Increased air temperature reduced invertebrate abundance and richness, altering community composition.
• Warming had a direct negative effect on early decomposition stages, independent of invertebrate abundance.

Conclusions:

• Climate change can directly impair decomposition rates, independent of its effects on invertebrate communities.
• Biodiversity plays a crucial role in maintaining ecosystem services like decomposition.
• Projected climate change may disrupt nutrient cycling by directly affecting decomposition processes.