DailyDesign 02

DailyDesign 02 - EXST7015 Daily Design 2 Carefully read the...

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EXST7015 Daily Design 2 Carefully read the description of the experiment below. Be prepared to answer the questions that follow the design description as a class quiz. Don’t use this example for class on August 30, 2011. Use the example below. Salmon build nests (redds) in the gravel bottoms of streams. The eggs are spawned on these nests and covered with gravel. The levels of dissolved oxygen in the water and the permeability of the stream bed are important variables in spawning success. A student of fisheries biology is examining the physical and chemical aspects of salmon spawning grounds. One of the relationships of interest is the percent of fine gravel (<2 mm diameter) because it is related to permeability and hence oxygen supply to the salmon eggs. To take samples of the stream bed the student inserted a pipe into the streambed and filled the pipe with liquid nitrogen. This freezes the stream bed sediment next to the core which can then be extracted and later thawed to determine stream bed
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