Ch2 Adaptations to the Physcial Environment - Water and Nutrients 2.pdf

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University College Courses
Spencer Barrett

 unicellular algae use droplets of oil to float  streamlined shapes (high viscosity of water hampers mvmt)  filamentous appendages (take advantage of water viscosity)  as animals become smaller, the momentum of their mvmt decreases relative to the viscosity of water  a tiny water flea seems to be swimming in molasses  but what impedes swimming also prevents sinking Many Inorganic Nutrients Are Dissolved in Water  orgnms require huge amounts of: H, C, O (the elements in carbs)  also need N, P, S, K, Ca, Mg, Fe  some also need other elements  ex. diatoms construct their glassy shells from silicates  ex. tunicates (sessile marine invertebrates) accumulate vanadium (defense against predators)  animals get nutrients from plants, plants from water The Solvent Capacity of Water  can dissolve many substances (makes them accessible to living sys. and provides a medium within which they can react)  powerful solvent  water molecules are strongly attracted to many solids (these compounds consist of electrically charged atoms or groups of atoms, ionsions  water molecules have both +ve and –ve charges  allows presence of minerals in water bodies  water vapour in atm. condenses to clouds (water is nearly pure, exc. for dissolved atm. gases N, CO )2  rainwater acquires minerals from dust particles and ocean spray in the atm.  picks up more minerals a
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