General Ecology_Mahaffy_Date_030410

General Ecology_Mahaffy_Date_030410 - Abiotic factors and...

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Abiotic factors and adaptations continued Dealing with water stress In animals More complex mechanisms but mostly same challenges as with plants See fig 4.23 and 4.24 Oxidative metabolism = cellular respiration (aerobic) Remember terrestrial organisms need to retain water and balance salts Kidneys help do this Only birds and mammals are capable of creating urine that’s more concentrated than their blood In plants Plants also balance salts Excludes Don’t let salt in vascular tissue Red mangrove Excretes Excretes salt from its vascular tissue Black mangrove, white mangrove, saltbush Tolerates Pickleweed, glasswort Dissolved substances Oxygen Discussed with thermocline Dissolves from the air into water and diffuses Cold water holds more gas Fresh water holds more gas Diffusion much slower in water than in air Max solubility of oxygen is 1% in water vs. 21% in the atmosphere Concentration varies with elevation, depth, consumption and diffusion
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This note was uploaded on 08/29/2010 for the course BISC 302 taught by Professor Walsh during the Spring '08 term at University of Delaware.

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General Ecology_Mahaffy_Date_030410 - Abiotic factors and...

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