Lecture 13 Flashcards
Give an example of an animal that has morphological regulation
The marine Iguana
Why can only male marine Iguanas dive?
Because the water is cold and they are about twice as big as the females and they have the mass so they can hold on to their body temperature so they can go long enough so they can stay submerged in the water (but can’t stay there very long)
Why are female and juvenile marine Iguanas restricted to feed around the edges of water?
Because the water is cold and they are not big enough to hold on to the body heat that allows then go under the water
How do we know that lizards are controlling their body temperatures?
Because when you look at lizards in their environment you see a narrow change in body temps but if you stick models of lizards around the environment in which they are found to have a whole range of temps. But when you look at their body temp there is little range so they are controlling their body temps so they are not only relying on the temperature of the environment because if they were then you would see the larger range in temps
When they looked at the preferred temp of lizards in the lab and the active animals in the field what did they find?
Found that the temp of the animals selective in the lab is about the same as the animals in the field and they are thermoregulating (done on a whole range of lizards)
How does the reptile Varanus varius regulate its body heat?
Through behavioural thermoregulation.
If they were sheltering then the first thing they do is go into the sun, if they have been in the sun then they move into partial sunshine but predominantly once they have been in the sun they is where they become active so they are shuffling between areas of shelter and areas of exposure
What are the ways ectothermic animals produce heat?
. Muscular activity= shivering
. Futile substance recycling
Give an example of an animal which is an ectotherm that is partially an endotherm
Dragonfly
What body temperature does a dragonfly have to get to, to fly?
35 degrees
Why can’t a dragonfly fly until its body temp get to about 35 degrees?
Can’t produce enough power
