Status of the Amphipod Diporeia spp. in Lake Superior, 1994–2000

Trends in Diporeia populations across the Laurentian Great Lakes, 1997–2009

“…Abundances in our study are very similar to those reported by Scharold et al (2004) from the mid-1990s for nearshore (b110 m) and offshore (N110 m) areas of western Lake Superior: 1990 and 365/ m 2 , respectively, compared to our 2008 densities of 2114 and 380/m 2 for those depth categories. These densities, however, are substantially higher than the open lake density average of 80/m 2 reported by Cook (1975) for 1973.…”

“…In Lake Huron, declines were first recorded in the late 1990s (Barbiero and Tuchman, 2002), and more extensive recent surveys have shown these declines to have continued (Nalepa et al, 2007). In contrast, US nearshore waters in the western half of Lake Superior have shown no consistent declines between 1994 and 2000, although abundance in 2000 was lower than that in 1994 in the eastern half of the lake (Scharold et al, 2004). Since abundance was only measured during two years in the eastern half of the lake, however, it is unclear if these reductions were within the range of interannual variability.…”

Lake Michigan: Nearshore variability and a nearshore–offshore distinction in water quality

“…An example would be fishes that easily cross current or mixing boundaries and have ecological interactions and connectivity to 60-120 m (e.g., Yule et al, 2008;Gorman et al, 2012). Benthic organisms also may have a distinct depth dependent structure across shallower water to a profundal community offshore (N100 m) (Scharold et al, 2004;Auer et al, 2013).…”

Environmental Monitoring and Assessment of a Great River Ecosystem: The Upper Missouri River Pilot

“…The exception was river shoreline, which was treated as a linear resource because we felt that existing response designs were appropriate (Peck et al, 2001). Areal designs have been employed by EMAP for estuaries (Summers et al, 1997) and Great Lakes (Scharold et al, 1995) -both of which may have more in common with GREs than with smaller surface waters. Our characterization of GRE habitats is also similar to the long-term resource-monitoring program on the upper Mississippi River (Wilcox, 1993).…”

“…Specific measures collected in reservoirs and their response designs were largely based on EMAP-Estuary (Summers et al, 1997), EMAP-Great Lake (Scharold et al, 1995) and our own pilot research. Samples for water chemistry and physical attributes were taken with a continuous profiling sensor array, a portable hydrolab multisensor and a Secchi disk at or in a small area around each design point.…”