Effects of plant diversity on nutrient cycling in a ...
Water Regulation and Adaptation Chap. 6 I. Water potential A. components B. water flow
II. Water balance A. water loss B. water gain III. Regulation & Adaptations plants & animals A. Terrestrial
B. Aquatic 1. Isoosmotic 2. Hypoosmotic 3. Hyperosmotic
Which way does water flow? Questions 1. How do you get water to the top of a 300 ft. tall redwood tree?
2. Why is soil under some trees more wet in the morning than the previous afternoon? Hint: it comes from the roots, not from rainfall. 3. Why are salmon so spectacular physiologically? (what makes going from fresh to salt water and
back again so remarkable)? Global Warming effects change in precipitation I. Water potential ()
A.The components = p + s + m + g B. Water flow Example up a tree,
down a water potential gradient Units = MPa Soil : Lower, more negative
Tension-cohesion mechanism Effect of water content on soil water
Effect of water content on soil : different soil types Effect of Relative Humidity on Air
S&R Fig.4-10 Hydraulic lift
II. Water balance W = Wg - Wl A. Water loss - Terrestrial organisms 1. Evaporation
Vapor pressure deficit (VPD) B. Water gain Drinking/root uptake
Uptake via body surface Water in food W = Wg - Wl Oxidation (metabolic water)
III. Regulation & Adaptations A. Terrestrial high potential for water loss 1. Intake metabolic water
Fig. 5.17 Tiger beetles cuticle thickness in different habitats 3. Loss
Linked behavior/morphology - vapor-limited evaporation - membrane-limited evaporation - Sclerophylls 4. Linked Temperature And Water
Adaptations C3, C4, and CAM photosynthesis C3 Photosynthesis http://www.digitalfrog.com/resources/archives/leaf.jpg
C4 Distribution CAM Photosynthesis
B. Aquatic 5 Questions 1. Terms: Iso-osmotic (isomotic), hypo-osmotic (hyposmotic), hyperosmotic. 2. To what situations do these refer?
3. What do animals (fish, invertebrates) need to do in marine environments to maintain their water and salt balances? 4. What do animals (fish, inverts.) need to do in freshwater environments to maintain their water
and salt balances? 5. What about anadromous fish such as salmon? How must their physiology change when migrating from fresh to salt water and vice versa?
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