If you then place the same box over a dish of water the isopods will slow down and return to normal as the water vapor rises through the screen bottom. Another interesting way to test for moisture reaction is to offer the isopods a choice of conditions. The isopods will wander about the box for awhile but soon will congregate on the water side. If you rotate the box so the dishes are reversed the isopods willl repeat their searching pattern and once again move to the water side. You can also test isopod responses to temperature.
Isopods are cold blooded, which means their bodies take on the temperature of their surroundings.
Place 4-6 isopods in a small jar with a cover and float it on water in a pan. Add ice cubes and a thermometer and stir gently so as not to tip the jar. The isopods will speed up their movements as the temperature rises. Re move the Isopods at this time or they will go into heat stupor which may kill them if prolonged. Isopods also react to light.