This photo displays students digging through sediment samples collected in Doubtful Sound (southwest New Zealand). The Manapouri hydroelectric dam constructed above Doubtful Sound (operation starting in 1972) discharges fresh water into the sound and disrupts the natural stratification of the water, resulting in a larger freshwater layer that allows more light into the water. Students collected sediment from three separate sites in the sound (disturbed inner fjord, undisturbed inner fjord, and outer fjord), and compared the invertebrates present in each site of fjord. The results will then be analyzed with respect to the differences in stratification to help quantify the effect of the dam.
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