Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:…could be found after a thorough search of all the anemones in the study population, indicating that short distance migration did not occur (Buston 2003a); and (3) no migrants came into the study population from anemones outside of the study population, indicating that long distance…
Category: