Adaptations to the Physical Environment: I.Water and Nutrients A. Properties and Adaptations 1. High Specific Heat Property: Takes a large change in E to change temp and state… so water is a stable internal and external environment
Jan 04, 2016
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat
Property: Takes a large change in E to change temp and state… so water is a stable internal and external environment
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat
Property: Takes a large change in E to change temp and state… so water is a stable internal and external environment, and evaporation cools surfaces
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity
ocean“fresh”
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity
Gases (swim bladder)Low Density FluidsFats, Oils
Positively Affect Buoyancy
Negatively Affect Buoyancy
Bone, CartilageShellChitinous ExoskeletonHeavy Ions
“Buoyancy” is a function of relative density of the organism to its environment.
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity
Temperature [°C] Viscosity [mPa·s]
10 1.308
20 1.002
30 0.7978
40 0.6531
50 0.5471
60 0.4658
70 0.4044
80 0.3550
90 0.3150
100 0.2822
Viscosity of Water
Small organisms may exploit viscosity and drag to slow sinking rate
Hydrodynamic shape is adaptive in mobile organisms
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity3. Universal Solvent
Ions and polar compounds dissolve in water, and become available for uptake or for chemical reactions.
- H2O + CO2 H2CO3 (carbonic acid) - H2CO3 (carbonic acid) H+ + HCO3
- (bicarbonate) - HCO3
- (bicarbonate) 2H+ + CO32- (carbonate)
Ca2+ is at maximum solubility in oceans, so it precipitates out with the carbonate as CaCO3
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity3. Universal Solvent4. Water Dissociates
Feldspar minerals:KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
Freeing H+ is solution, which can displace other cations bound minerals; this is chemical weathering, and it makes these cations available for bio-uptake (K+, Al+, Na+, Ca+)
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity3. Universal Solvent4. Water Dissociates5. Water is Adhesive and Cohesive
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity3. Universal Solvent4. Water Dissociates5. Water is Adhesive and Cohesive6. Water Potential
- mechanical pressure (+) - gravitational pressure (+) - humidity pressure (+) - solute/osmotic pressure (-) - matrix adhesion effects (-)
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Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
1. High Specific Heat2. Density and Viscosity3. Universal Solvent4. Water Dissociates5. Water is Adhesive and Cohesive6. Water Potential7. Plants
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
7. Plants
Water uptake by roots
Plant use a H+ pump to actively transport H+ out of cell; this causes cation displacement of cations, that either diffuse into the cell or are actively transported into the cell…
Increase solute concentration decreases water potential in cell
Water moves in by osmosis
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
7. Plants
Water uptake by roots
Water is transported between root cells through plasmodesmata – cytoplasmic connection through cell walls.
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
7. Plants
Water uptake by roots
Cl- ions are actively transported from endodermal cells (pericycle), and water follows into the xylem by osmosis.
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
7. Plants
Transport in xylem
Facilitated by capillary action – the combined effects of cohesive and adhesive forces in small tube
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
7. Plants
Action in the leaf a – water flows into cells and vaporizes in spongy mesophyll
b – vapor moves from substomal air space (b) out of leaf (c), drawing more water into substomatal space from xylem
c- under dry conditions, guard cells shrivel, closing the stoma, reducing evaporative water loss
Adaptations to the Physical Environment:I.Water and Nutrients
A. Properties and Adaptations
8. Animals