Fungal network responses to grazing.

Area of Science:

• Ecology
• Mycology
• Systems Biology

Background:

• Fungal mycelial networks are crucial ecological components, exhibiting adaptability across diverse scales and durations.
• Understanding their behavioral responses on natural substrates under realistic conditions is vital for ecological studies.

Purpose of the Study:

• To investigate how grazing impacts the architecture and resilience of fungal mycelial networks over extended periods.
• To assess the role of resource availability in mediating network responses to grazing and simulated damage.

Main Methods:

• Quantified mycelial network responses in large-scale microcosms (57 x 57cm) over 7.5 months.
• Compared grazed versus ungrazed networks under varying resource conditions.
• Assessed network resilience using in silico simulated damage.

Main Results:

• Resource limitation hindered network adaptation, leading to gradual thinning in both grazed and ungrazed conditions.
• Added resources transiently boosted exploratory growth and cross-connectivity but did not sustain resilience.
• Grazing initially reduced network strength and exploratory growth but induced interstitial proliferation, forming new cross-links and enhancing overall resilience.

Conclusions:

• Mycelial networks demonstrate adaptive resilience to grazing, with consolidation enhancing structural integrity.
• Resource availability is a critical factor influencing network responses, with limitations impairing adaptation.
• Grazed networks, despite initial setbacks, can develop greater resilience through internal structural reorganization.