EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/23/2019 | 9:45 AM - 10:00 AM | FRESHWATER INVERTEBRATE ASSIMILATION OF MICROBIAL NUTRIENTS FROM DETRITUS UNDER LIGHT AND PHOSPHORUS MANIPULATION | 254 B
FRESHWATER INVERTEBRATE ASSIMILATION OF MICROBIAL NUTRIENTS FROM DETRITUS UNDER LIGHT AND PHOSPHORUS MANIPULATION
Recent studies have observed that periphytic algae can stimulate or prime heterotrophic microbial decomposers associated with decaying leaf litter, thus potentially modifying the flow of energy and nutrients to detritus feeding consumers in aquatic ecosystems. This study employed C and phosphorus (P) isotopic radiolabels to analyze how detrital microbial constituents (i.e. heterotrophs and autotrophs) contribute C and P to detritivore nutrition under raised light and nutrient regimes. We conducted a feeding study using Liriodendron tulipifera leaf litter conditioned under contrasting light and nutrient levels and fed to detritivorous caddisflies (Pycnopsyche sp.). We quantified detrital microbial biomass and production rates and caddisfly radiolabel assimilation and incorporation efficiencies. Increased light and nutrients stimulated detrital autotrophic and heterotrophic microbial activity. While leaf litter diets weakly affected Pycnopsyche acquisition of microbial P, acquisition of microbial C differed across microbial groups and diets. Overall, Pycnopsyche incorporated 94-97% microbial C from fungi and 1-3% from bacteria and algae. Our results show that light and nutrients can determine the quality of microbial nutrients available to detritivores, which may have important implications for our understanding of organic matter processing and energy flow in aquatic habitats.
- Microbial
- Isotope
- Invertebrate
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Presenters/Authors
Taylor Price
(), The University of Southern Mississippi, taylor.l.price@usm.edu;
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Halvor Halvorson
(), University of Central Arkansas, hhalvorson@uca.edu;
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Steve Francoeur
(), Biology Department, Eastern Michigan University, steve.francoeur@emich.edu;
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Kevin Kuehn
(), The University of Southern Mississippi, kevin.kuehn@usm.edu;
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