2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

5/25/2021 | 2:00 PM - 3:30 PM | WHEN A LEAF FALLS IN A RIVER WHO COMES WITH IT AND WHERE DOES IT GO? | Virtual Platform

WHEN A LEAF FALLS IN A RIVER WHO COMES WITH IT AND WHERE DOES IT GO?

Integrating omics with isotopes allows us to answer new questions and revisit old questions. Here we demonstrate how these new tools have reshaped our understanding of decomposing leaves. Sequencing has revealed greater species richness of fungi on leaves than indicated by spore production. Species presence however, does not predict their importance, as many bacterial and fungal species can be dormant. Using quantitative stable isotope probing (qSIP) to identify growing microbes we found that most growing fungal species on leaves enter the water with the leaf, whereas most growing bacteria colonize from the water column. The majority of bacteria on litter are growing, whereas the majority of fungi are dormant. Using leaves labeled with 13C and 15N we demonstrate that more C and N is transferred to invertebrates from slowly decomposing leaves whereas faster decomposing litter support more microbial biomass. Results challenge the view that faster is better, suggesting that microbes compete with invertebrates on labile leaf litter but facilitate invertebrates on recalcitrant litter. We present a new emerging paradigm for understanding linkages between aquatic and terrestrial ecosystems and the fates of dead leaves in streams.

Organic matter
Women
Ecosystem functioning

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Presenters/Authors

Jane Marks (), Northern Arizona University, jane.marks@nau.edu;