Biodiversity-function relationships in methanogenic communities.

Area of Science:

• Microbiology
• Environmental Science
• Biotechnology

Background:

• Methanogenic communities are essential for carbon cycling and anaerobic digestion.
• Limited understanding exists on how methanogen diversity impacts methane production rates.
• Previous studies were correlational due to cultivation challenges.

Purpose of the Study:

• To investigate the causal relationship between methanogenesis and microbial diversity.
• To experimentally manipulate and assess the impact of diversity on methane production.
• To determine the role of rare species in methanogenic communities.

Main Methods:

• Laboratory anaerobic digesters were used to experimentally manipulate microbial diversity.
• Cultures were diluted and biomass equilibrated, leading to the loss of rare species.
• Methane production rates were measured against varying levels of microbial diversity.

Main Results:

• A positive correlation was observed between the number of taxa and methane production.
• Little evidence of functional saturation was found, indicating a role for rare species.
• No initial correlation between composition and methane production was found in natural communities.

Conclusions:

• Methanogenic communities exhibit low functional redundancy.
• Loss of microbial diversity, whether natural or induced, likely reduces methane production.
• Preserving diversity is crucial for efficient anaerobic digestion and methane yield.