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 &

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Presentation transcript:

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 (Ψ) A.The components Ψ = Ψp + Ψs + Ψm + Ψg

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 Ψ

Effect of water content on soil Ψ: different soil types

Effect of Relative Humidity on Air Ψ S&R Fig.4-10

Hydraulic lift

II. Water balance  W = W g - W l

A. Water loss - Terrestrial organisms 1. Evaporation

Vapor pressure deficit (VPD)

B. Water gain  W = W g - W l Drinking/root uptake Uptake via body surface Water in food Oxidation (metabolic water)

III. Regulation & Adaptations A.Terrestrial – high potential for water loss 1. Intake – metabolic water

1. Intake Prosopis (mesquite) gs/Prosopis%20Omer%20(3).jpg Fig. 5.12

2. Storage

3. Loss Physiological Schmidt-Neilson 1995

3. Loss Behavioral – reduce surface area phenology Wilting

3. Loss Linked behavior/morphology - vapor-limited evaporation - membrane-limited evaporation

Fig Fig 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

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?

Isosmotic

Saltwater – hypo-osmotic

Freshwater – hyperosmotic

C4 Photosynthesis