Thermoregulation Flashcards
Enzyme thermal stability examples
Mullet - enzyme substrate affinity has very little change over a wide range of temperatures
Antarctic fish - very sensitive over a short temperature range
Partial heterothermy and regional heterothermy examples
Partial heterothermy - eg bats in torpor
Regional heterothermy - tuna red muscles and bird legs
Regulation of body temp in ectotherms examples
Desert living snail - shape of shell causes air currents to flow within cooling temperature
Baby crocs and adult crocs
Marine iguana - diving and basking and heart rate hysteresis
Varanus varius - basking, part sun, shade and heart rate hysteresis
Reverse hysteresis in pogona barbarta
Bumblebee thermoregulation
Thorax covered in hair, warm blood countercurrent system of want blood from thorax and cold blood from abdomen - cooling down, pulse blood instead of continuous flow
Bee swarm formatting - huddled around outside and gaps in formation
Countercurrent heat exchange in mammalian fish
Dolphin fins and flukes, tongues of baleen whales - periarterial Venus retes
Changes during fasting examples
Emperor penguin - 1st phase = sharp reduction in body mass, high mr 2nd phase = gradual reduction, as body mass decreases less lipids lost, 3rd phase = starvation, protein stores, sharp reduction in body mass
Eider ducks - go off to forage or die incubating
Antarctic seal fur pups - RQ dips and raises but triglyceride, glucose and b-hba levels do not suggest starvation
Effects of temperature examples
Higher wing beat frequency and increased power output per stroke in moths
Lizard running speed increases (frequency not stride length)
Huddling examples
Migrating blackcaps - huddling individuals lose less body mass than solitary ones and have a significantly lower mr
Emperor penguins - huddled individuals can incubate eggs for a longer duration - out of wind, warmer ambient temp less energy required
