2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2019 | 10:00 AM - 10:15 AM | STOICHIOMETRY OF ALGAL-MEDIATED PRIMING EFFECTS DURING LEAF LITTER DECOMPOSITION: A META-ANALYSIS | 253 AB
STOICHIOMETRY OF ALGAL-MEDIATED PRIMING EFFECTS DURING LEAF LITTER DECOMPOSITION: A META-ANALYSIS
Periphytic algae exude labile carbon (C) that can strongly alter heterotrophic decomposition of organic matter via priming effects. Though highly variable, the intensity of algal priming may depend on dissolved nitrogen (N) and phosphorus (P) availability, in turn affecting the stoichiometry of nutrient immobilization/mineralization during decomposition. We conducted a meta-analysis of experiments addressing stoichiometric constraints on algal priming intensity and algal effects on standing litter-periphyton C:N:P content and nutrient mineralization during leaf litter decomposition. Across 9 datasets, algal priming intensity varied widely, from algae inducing a 410% decrease to a 104% increase of decomposition rates. Priming intensity was weakly related to inorganic N and P concentrations, but was strongly positively correlated with dissolved N:P (r=0.772, P<0.05). Amid this variation, net algal effects on litter-periphyton C:N, C:P, and N- and P-specific mineralization were weak and highly variable. Despite these inconsistent effects, algae tended to reduce litter-periphyton C:N and increase N mineralization rates with increasing priming intensity associated with higher dissolved N:P (P<0.05). Our findings suggest algal priming effects switch from negative to positive with increasing dissolved N:P, subsequently altering the role of heterotrophic microbes in nutrient mineralization during organic matter decomposition.
- Decomposition
- Stoichiometry
- Nutrients
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Presenters/Authors
Halvor Halvorson
(), University of Southern Mississippi, Halvor.Halvorson@usm.edu;
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Steve Francoeur
(), Biology Department, Eastern Michigan University, steve.francoeur@emich.edu;
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Robert Findlay
(), University of Alabama, rfindlay@ua.edu;
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Kevin Kuehn
(), The University of Southern Mississippi, kevin.kuehn@usm.edu;
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