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Large, deep lakes could see an increase in suitable <br />habitat for warm water fishes in the summer, without <br />exceeding the temperature tolerances of cool water <br />fish in the cooler waters of the hypolimnion. Smaller, <br />shallower lakes may experience enough loss of cooler <br />bottom waters to reduce habitats for cool water fish. <br />Changes in temperature caused by global climate <br />change may also affect primary production and the <br />nutrient concentration of inland waters (reviewed in <br />Ficke et al. 2007). Increased productivity resulting <br />from warmer temperatures can lead to oxygen deple- <br />tion in bottom waters as algae and organic matter <br />settle out of surface waters and decompose. <br />Summer TemperaturelDissoived Oxygen Squeeze <br />Current Future <br />(higher temperature&, ivwer inflow) <br />VMrrr+waier Fishes Hawing <br />Vlfarmwater Fishes <br />air rte► � 4Warm 5€ rlaca <br />� <br />Water <br />Coopsater Fishes, <br />"7' 'T T <br />Oxygenated Coal Zon <br />No FIsh I dish o <br />�w Oxygen <br />MLre Respiration Coop Wa!er <br />Thermal Refuges <br />isprirgs) a. <br />�f <br />S»itabie Ca4tweter <br />Habitat <br />Cilmatia Change May Ca�rse a Summer Hahi,at 5u+ieazo for CooKvater Fish <br />Figure 3. Potential increases in the severity of the summer temperature— dissolved oxygen squeeze with future climate change <br />Figure 2 -3. Increased air temperatures are expected to result in decreased cool water fish habitat as a result of <br />higher water temperatures in surface waters and lower dissolved oxygen concentrations in deeper waters (Source: <br />Mulholland et al. 1997, © Wiley Interscience, used with permission). <br />