Figure 1.16 seems at first to be simply a description of thephysical and chemical properties of a lake. Outline how livingorganisms participate in determining the physical and chemical(i.e., temperature and O2) patterns. Consider organisms livingboth in the lake and on the land surrounding the lake. Consideralso a research report that shows that dense populations of algaesometimes change the temperature structure of lakes by raisingthe thermocline and thereby increasing the thickness of the deep,cold layer; how could algal populations do this, and what couldbe the consequences for deep-water animals? O, enters a lakeonly near the surface(through photo-synthesis or aeration).O, concentration-Temperature-2When a sun-heatedWarm, low-densitylayer of water;O-richsurface layer formsin the summer, ittends to float on top ofthe deep, cold layer.8.Little mixing betweenthe two layers occursacross the thermocline,the transition layerwhere temperaturechanges rapidly withdepth.101214The failure of the16Cold, high-densitylayer of water;O,-depletedsurface and deeplayers to mix cutsoff the O, supply tothe deep waters.182026810Oxygen concentration (mL OL) –48121620Temperature ("C)) -Depth (meters below surface)

The chemical and physical environments on Earth are remarkably diverse, providing life with a…

O, enters a lake only near the surface (through photo- synthesis or aeration). O, concentration- Temperature- 2 When a sun-heated Warm, low-density layer of water; O-rich surface layer forms in the summer, it tends to float on top of the deep, cold layer. 8. Little mixing between the two layers occurs across the thermocline, the transition layer where temperature changes rapidly with depth. 10 12 14 The failure of the 16 Cold, high-density layer of water; O,-depleted surface and deep layers to mix cuts off the O, supply to the deep waters. 18 20 2 6 8 10 Oxygen concentration (mL OL) – 4 8 12 16 20 Temperature ("C) ) - Depth (meters below surface)

O, enters a lake only near the surface (through photo- synthesis or aeration). O, concentration- Temperature- 2 When a sun-heated Warm, low-density layer of water; O-rich surface layer forms in the summer, it tends to float on top of the deep, cold layer. 8. Little mixing between the two layers occurs across the thermocline, the transition layer where temperature changes rapidly with depth. 10 12 14 The failure of the 16 Cold, high-density layer of water; O,-depleted surface and deep layers to mix cuts off the O, supply to the deep waters. 18 20 2 6 8 10 Oxygen concentration (mL OL) – 4 8 12 16 20 Temperature ("C) ) - Depth (meters below surface)

Aquaculture Science

3rd Edition

ISBN:9781133558347

Author:Parker

Publisher:Parker

Chapter12: Water Requirements For Aquaculture

Section: Chapter Questions

Problem 24SA

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