2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 12:15 PM - 12:30 PM | LEGACY DISTURBANCE IN A LAKE LITTORAL ZONE: EFFECTS OF MINING RESIDUE ON THE COMPOSITION OF MACROPHYTE COMMUNITIES | 302C
LEGACY DISTURBANCE IN A LAKE LITTORAL ZONE: EFFECTS OF MINING RESIDUE ON THE COMPOSITION OF MACROPHYTE COMMUNITIES
Large-scale disturbances can cause legacy effects on community composition in lakes that may persist for decades or longer. We quantified legacy effects of heavy-metal rich mining residues (hereafter stamp sands) deposited from 1868-1910 on littoral macrophyte community composition and presence of invasive macrophytes by comparing 15 sites with stamp sands to 15 sites with native sand and organic sediment in the Keweenaw Waterway of Michigan. Where macrophytes were present, total macrophyte biomass, diversity, and species richness did not differ between site type. Also, occurrence of non-native Myriophyllum spicatum and hybrid M. spicatum x sibiricum was not different by site type. Non-metric multidimensional scaling and multi-response permutation procedures revealed that significant differences in the composition of macrophyte communities between site types was explained by heavy metal concentrations and texture of sediments within sub-regions of the waterway with similar hydrodynamic conditions, but not the whole waterway. Our results suggest that this legacy disturbance may have lasting effects on littoral macrophyte communities that are evident at some spatial scales, although it does not appear to facilitate species invasion in this waterway.
- C11 Community Ecology
- C07 Lentic Ecology
- C11 Community Ecology
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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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Kevyn Juneau
(), University of Wisconsin - River Falls, kevyn.juneau@uwrf.edu;
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