3.3.1. Assessing fertility

Assessing fertility of mites reproducing in artificial (see section 3.2. ‘Rearing mites in the laboratory’) or natural cells follows the same principle than described for field methods (see section 4.3.1. ‘Assessing reproductive success’). A difference is that if transparent cells are used (Donzé and Guérin, 1994; Nazzi and Milani, 1994), one does not need to open the cell to count offspring. Offspring production and survival can thus be monitored over time.