Tuesday, June 5, 2007 - 8:45 AM
103

Ecosystem response to restoration in three sand-dominated Michigan streams

Eric B. Snyder1, Jason A. DeBoer1, Nichol Y. De Mol1, Nicholas J. Gressick2, J. Marty Holtgren3, Kris N. Nault1, Stephanie Ogren3, and April L. Wright1. (1) Biology, Grand Valley State University, 1 Campus Drive, Allendale, MI 49401, (2) J.F. New, 600 South Beacon Blvd., Suite A, Grand Haven, MI 49417, (3) Conservation, Little River Band of Ottawa Indians, Manistee, MI 49660

Historic inputs of sediment derived from the logging era represent a ubiquitous problem in Michigan streams.  This project sought to reduce continuing inputs of sediment while measuring a combination of functional and structural response variables in a BACI design.  Monitoring (2 pre- and 1 year post-restoration) indicated that undersized culverts trapped fine sediments upstream while old bridges contributed to fine sediments downstream.  The restoration efforts in the short term documented an increase in coarse sediments at some sites (p<0.05, MANOVA).  The macroinvertebrate community showed positive changes in diversity and abundance metrics (p<0.05), but was not significantly correlated to the restoration efforts (MANOVA).  The fish community showed no significant responses to restoration, except where a perched culvert was replaced (increased (p<0.05) potamodromous salmonids upstream).  Multivariate (NMDS) analyses indicated both macroinvertebrate and fish communities were correlated to substrate, thus more time may be required to show positive restoration effects in the biotic community.  In addition, an OM budget and community metabolism suggest strong links to substrate characteristics.  As predicted, the habitat template plays a strong role in determining both structural and functional properties, allowing us to examine the relationship between the restoration effort and temporal and spatial patterns in biophysical improvements.