2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 11:45 AM - 12:00 PM | EFFECTS OF LIGHT AND THE SELECTIVELY OMNIVOROUS SHRIMP MACROBRACHIUM OHIONE ON DETRITAL MICROBIAL BIOFILMS IN STREAMS | 321
EFFECTS OF LIGHT AND THE SELECTIVELY OMNIVOROUS SHRIMP MACROBRACHIUM OHIONE ON DETRITAL MICROBIAL BIOFILMS IN STREAMS
In lotic freshwater systems, aquatic macroinvertebrates are key processors of biofilms that grow upon organic matter. Although the effects of macroinvertebrates on biofilms may depend on light availability, the combined effects of consumers and light remain unexplored. Here, we tested effects of presence versus absence of the shrimp Macrobrachium ohione on Liriodendron tulipifera biofilms in experimental streams under full light or darkness. We measured algal and fungal biomass and production rates, as well as litter decomposition, over 49 days. Light significantly increased algal production and exudation rates (P<0.001) while temporal effects in algal production and exudation depended on shrimp presence or absence (P<0.001). Fungal biomass was significantly greater under dark treatment (P<0.05) but did not respond to shrimp manipulation, and fungal production rates did not differ across treatments, but fungal growth rates were significantly stimulated in light (P<0.05). Litter decomposition rates did not depend on light or shrimp treatments. These results suggest that light can change multiple characteristics of litter biofilms and, while M. ohione may not affect the biofilm overall, this consumer species can have a measurable effect on the timing of periphytic algal colonization of organic matter.
- Biofilm
- Algae
- Organic Matter
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Presenters/Authors
Cheyenne Brady
(), University of Southern Mississippi, w864850@usm.edu;
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Steve Francoeur
(), Biology Department, Eastern Michigan University, steve.francoeur@emich.edu;
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Halvor Halvorson
(), University of Central Arkansas, hhalvorson@uca.edu;
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Kevin Kuehn
(), The University of Southern Mississippi, kevin.kuehn@usm.edu;
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