Phenology
Yellow dung fly viability depends strongly on the environment. In warmer climates, there is often a sharp population decline in the summer months, when the temperature increases above 25°C. Meanwhile, there is no population decline in colder climates, such as Iceland, Finland, northern England, and high elevations. Additionally, the number of generations per year varies with altitude and latitude, typically between two and four overlapping generations. The end of winter synchronizes the first emergence in March, and the overwinter generations are produced in the fall. In northern Europe, where the mating season is shorter, only one or two generations can be expected.
Read more about this topic: Scathophaga Stercoraria