2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/22/2018 | 11:30 AM - 11:45 AM | EFFECTS OF INVASIVE MACROPHYTES ON LITTORAL PRIMARY PRODUCERS IN NORTH-TEMPERATE LAKES | 430 B
EFFECTS OF INVASIVE MACROPHYTES ON LITTORAL PRIMARY PRODUCERS IN NORTH-TEMPERATE LAKES
The invasive macrophyte Myriophyllum spicatum can increase physical structure of littoral habitats, while also competing for nutrients with and shading macrophytes, periphyton, and phytoplankton below. We conducted a field study in 6 lakes across Michigan to test the hypothesis that presence of M. spicatum could alter standing crop and production rates of littoral primary producers. We measured open water metabolism in paired invaded and uninvaded plots in each lake, while simultaneously measuring standing crops, primary production and respiration rates of epiphytes, periphyton and phytoplankton using light-dark chambers. We found that invaded and uninvaded plots had similar rates of primary production (4.52 ± 0.83 vs 3.73 ± 1.09 g O2 m-2 d-1, respectively) and respiration (-5.48 ± 1.62 vs -3.92 ± 1.68 g O2 m-2 d-1). Yet macrophyte biomass and epiphytic ash free dry mass was 2.5 and 4-fold higher in invaded vs. uninvaded plots. These differences in standing crops could lead to differences in production rates among these different primary producers in invaded plots. Changes in the distribution of primary production due to M. spicatum invasion may be key for predicting how this invasive plant alters littoral food webs.
- Primary Production
- Macrophyte
- Periphyton
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Presenters/Authors
Ryan Van Goethem
(), Michigan Technological University, rrvangoe@mtu.edu;
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Amy Marcarelli
(), Michigan Technological University, ammarcar@mtu.edu;
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Casey Huckins
(), Michigan Technological University, cjhuckin@mtu.edu;
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