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…

Answered: O, enters a lake only near the surface…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Figure 1.16 seems at first to be simply a description of the
physical and chemical properties of a lake. Outline how living
organisms participate in determining the physical and chemical
(i.e., temperature and O2) patterns. Consider organisms living
both in the lake and on the land surrounding the lake. Consider
also a research report that shows that dense populations of algae
sometimes change the temperature structure of lakes by raising
the thermocline and thereby increasing the thickness of the deep,
cold layer; how could algal populations do this, and what could
be the consequences for deep-water animals?

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)

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