Behavior
C. vicina play an integral part in post mortem interval determination. Factors such as region, weather temperatures, time of day and conditions under which the body was found all contribute to determining a post mortem interval (PMI). To complete the calculation the entomologist must consider what is commonly known about C. vicina and integrate it with experimental data gathered from a crime scene. The entomologist must know how the blow-fly behaves specifically in the area where the body was discovered. This involves recording environment temperatures at the crime scene as well as retrieving a history of the climate in the region. C. vicina in particular is adapted to cooler temperatures, appearing most commonly in winter and less often in the summer months. This puts their flight activity threshold at above 55-60°F (13-16°C), a lower temperature than most other blow-flies. Knowing the threshold temperature allows the entomologist to calculate accumulated degree days, which in turn helps determine PMI.
Some knowledge regarding C. vicina behavior is well known. Case studies have shown that it is not the first species in arrival. However, it does appear one to two days before Phaenicia sericata. However, determining PMI is an intricate process because there is still much that we do not know about C. vicina behavior. For instance, it is a long held belief that the species is not nocturnally active. Recently, however, it has been shown that C. vicina is indeed active at night under certain experimental conditions.
Read more about this topic: Calliphora Vicina
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—Henry David Thoreau (1817–1862)