Abstract
Decomposer fungi are primary decomposing agents in terrestrial soils. Their mycelial networks play an important role in nutrient mineralisation and distribution, but are also nutritious resources for various soil invertebrates. Global climate change is predicted to alter the diversity and community composition of these soil fauna. To understand whether changes in invertebrate species diversity are likely to affect fungal-mediated decomposition, this study compared the grazing potentials of different invertebrate taxa and functional groups. Specifically, the grazing impacts of seven invertebrate taxa on the growth and spatial distribution of six basidiomycete fungi growing from beech wood blocks in soil microcosms were explored. Wood decay rates by fungi were also compared. The consequences of grazing were both taxon- and species-specific. Generally, macro-invertebrates caused the greatest damage, while meso- and micro-invertebrates often stimulated mycelial growth. Invertebrate size, preferences and population dynamics are likely to influence grazing potentials. Effects of grazing varied between fungi, with mycelial morphology and biochemistry possibly influencing susceptibility. Heavy grazing indirectly increased fungal-mediated wood decomposition. Changes in invertebrate community composition are predicted to have consequences for fungal growth, activity and community structure in woodland soils. Abiotic climate change factors including CO2 and temperature affect mycelial productivity directly, but the indirect effects, mediated through changes in the soil invertebrate community, may be equally important in controlling ecosystem functioning.
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Don A’Bear, Matthew Dray, Eleanor Kean and Eleanor Sherrard Smith provided comments during manuscript preparation. The work was funded by the Natural Environment Research Council (NE/G523420/1).
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Communicated by Hakan Wallander.
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Crowther, T.W., Boddy, L. & Jones, T.H. Species-specific effects of soil fauna on fungal foraging and decomposition. Oecologia 167, 535–545 (2011). https://doi.org/10.1007/s00442-011-2005-1
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DOI: https://doi.org/10.1007/s00442-011-2005-1