Variability is said to be beneficial for example in parasitic load, or nest-temperature regulation. Many studies were already done exploiting this topic mathematical and genetical. I wanted to do the first behavioral experiments to challenge this hypothesis.
Bumblebees are known to regulate nest-temperature. This gives them a certain degree of independence from environmental conditions.
If inter-individual variability is beneficial there must be a measurable difference between groups with high and low variability.