2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 10:00 AM - 10:15 AM | DECAY OF MACROALGAE AND LEAVES AND THEIR RELATION TO DETRITAL FOOD WEBS | 306A
DECAY OF MACROALGAE AND LEAVES AND THEIR RELATION TO DETRITAL FOOD WEBS
This project addressed if decaying macroalgae and leaves played a major role in the detrital pool of a 7th-order karst river. Decay rates and changes in carbon and nitrogen isotopic ratios of Cladophora glomerata, Platanus occidentalis, and a mix of Acer negundo and A. saccharinum were tracked during summer and autumn–spring. Packs of air-dried C. glomerata, P. occidentalis, and Acer were placed in mesh bags and put in groups (n=4) in wire baskets. Seven baskets were submerged in riffle (20–30 cm) and run (2 m) habitats.
Isotopic values of Cladophora were not significantly different than leaves in summer but were significantly more δ13C-depleted in autumn–spring. Cladophora had significantly lower macroinvertebrate richness and shredder abundance in both summer and autumn–spring. Seasonality had a strong influence on decay rates, leading to greater mass loss of all three species in the summer compared to autumn–spring. Low richness and low shredder abundance on decaying macroalgae suggests Cladophora is not consumed by macroinvertebrates but used strictly as habitat, passing only through a microbial food web before being mineralized as CO2.
- C06 Large River Ecology
- C01 Algae
- C31 Organic Matter Processing
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Presenters/Authors
Megan Grandinetti
(), Western Kentucky University , Megan.grandinetti799@topper.wku.edu;
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Scott Grubbs
(), Western Kentucky University, scott.grubbs@wku.edu;
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Albert Meier
(), Western Kentucky University, albert.meier@wku.edu;
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Delaney Rockrohr
(), Western Kentucky University, delaney.rockrohr214@topper.wku.edu;
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