2010 BIO 203 Lecture 4

2010 BIO 203 Lecture 4 - BIO 203: Lecture 4 - Temperature...

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1 BIO 203: Lecture 4 - Temperature Regulation Prof. William Collins Office: 534 Life Sciences Building Office Hours: Tuesdays, 11:30 AM - 12:30 PM Thursdays, 4:00 - 5:00 PM Relationship Between Metabolic Rate (MR) and Ambient Temperature (T amb ) Ectotherms Endotherms T amb MR BMR TZ T B constant As T amb decreases: • T B decreases • MR decreases As T amb decreases: • MR increases to maintain T B T amb T B T amb Optimum MR
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2 Regulation of T B in Ectotherms (Behavioral Thermoregulation ) temperature gradient 0 o 10 o 20 o 30 o 40 o C goldfish selects “preferred temperature” (fairly narrow range) explores Place goldfish in water with a temperature gradient and observe behavior. Behavioral Thermoregulation - Selecting Temperature by Behavior time goldfish Behavioral Thermoregulation (Cont.) e.g., Anole {South American Andes} T night night day T amb activity 15 o C 30 o C T B sits in sun on rock to increase MR T B >> T amb burrows to minimize heat loss
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3 Behavioral thermoregulation (Cont.) Heliotherm --heat source is the sun Thigmotherm --heat source is the substrate (earth); e.g., rocks How gained (IN)--conduction/convection/radiation! We do this all the time--Energetically very cheap!! Putting sweater on…sitting in sun… Ectotherms…will normally not tolerate rapid temperature changes… Bullheads (catfish): Maximum Critical Temperature (CT max ) Temperature at which some percentage of animals will die when placed in it. CT max changes with seasons - lower in the winter CT max summer 30 o C 36 o C winter Bullheads acclimated to warm temperature can better tolerate high temperature than bullheads acclimated to cold temperature MR T amb CT max
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4 Bullhead Catfish Catfish caught in the River Ebro near Barcelona, Spain. This 211 lb female is 15 lbs below Spain’s record. She was burped (to get the air out of her stomach) and released unharmed. Thermal Acclimation selective synthesis of multiple forms of the same enzyme (as well as other proteins/lipids/etc.) isoenzymes (isoforms)--isoform A & isoform B (only one will be produced at a time) function at different rates @ different temperatures Rate T amb warm acclimated (isoenzyme B) Isoenzymes have different optimal temperatures cold acclimated (isoenzyme A) Optimal MR
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5 Thermal Acclimation - Acute Response Fish is acclimated to 20 o C (Optimal MR)
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This note was uploaded on 03/28/2011 for the course BIO 203 taught by Professor Johncabot during the Spring '08 term at SUNY Stony Brook.

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2010 BIO 203 Lecture 4 - BIO 203: Lecture 4 - Temperature...

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