Initial colonization, community assembly and ecosystem function: fungal colonist traits and litter biochemistry mediate decay rate

Molecular Ecology
Lauren C Cline, Donald R Zak

Abstract

Priority effects are an important ecological force shaping biotic communities and ecosystem processes, in which the establishment of early colonists alters the colonization success of later-arriving organisms via competitive exclusion and habitat modification. However, we do not understand which biotic and abiotic conditions lead to strong priority effects and lasting historical contingencies. Using saprotrophic fungi in a model leaf decomposition system, we investigated whether compositional and functional consequences of initial colonization were dependent on initial colonizer traits, resource availability or a combination thereof. To test these ideas, we factorially manipulated leaf litter biochemistry and initial fungal colonist identity, quantifying subsequent community composition, using neutral genetic markers, and community functional characteristics, including enzyme potential and leaf decay rates. During the first 3 months, initial colonist respiration rate and physiological capacity to degrade plant detritus were significant determinants of fungal community composition and leaf decay, indicating that rapid growth and lignolytic potential of early colonists contributed to altered trajectories of community assembly. Fu...Continue Reading

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Citations

Sep 15, 2017·The New Phytologist·Leho TedersooSten Anslan
Jul 7, 2020·FEMS Microbiology Ecology·Michaeline B N AlbrightJohn Dunbar
Jun 17, 2021·Applied and Environmental Microbiology·Leho TedersooBenjamin Callahan
Nov 18, 2021·Ecology Letters·William A ArgiroffJulia P Belke

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