Measures include substrate quality, instream habitat cover, watershed characteristics, shoreline development, littoral and profundal zone development and quality, depth, and measures of erosion and embeddedness.
The loss of high quality biological conditions among the lakes in the Hoosier National Forest is not a result of littoral habitat loss, but rather a loss of profundal zone due to the loss of depth.
Although riparian habitat scored the highest for regionally similar reservoirs in the Interior River Lowland or Interior Plateau Ecoregions, substrates, profundal zone quality, and instream cover were reduced compared to other reservoirs.
Within their native range in the Dnieper River Delta and Dnieper-Bug Liman, Ukraine, which has no profundal zone, the 2 species have been dominant in different areas of water bodies or in different years in the same water body (Table 3).
Thus, once introduced, they may be less likely to establish, especially in water bodies where zebra mussels have already invaded and in lakes without a large profundal zone.
animals in the profundal zone are less likely to attach to boats) may have played an important role in the differences seen between the spread of these two species.
Relative Abundance Years of of Quagga Water Body, Country, Year Coexistence Mussels Native range Dnieper-Bug Liman, Ukraine, 2006, 22% average Bug Liman, Radsad settlement, 54% Ukraine, 2006 Dnieper River, Kherson City, Ukraine, 2006: 3 m in depth 95% 1 m in depth 12% Verevchina River, Kherson City, 68% Ukraine, average for 2001, 2006, 2007 Lakes and reservoirs without large profundal zone Kanevskoe Reservoir, Ukraine, 2001: <1.
We compared populations of these species in lakes and reservoirs with and without large profundal zones with those found in rivers and canals.