Data from: Three decades of cultural evolution in Savannah sparrow songs

Heather Williams, Iris I. Levin, D. Ryan Norris, Amy E. M. Newman, Nathaniel T. Wheelwright & Amy E.M. Newman
Cultural evolution can result in changes in the prevalence not only of different learned song types within bird populations but also of different segments within the song. Between 1980 and 2011, we examined changes within different segments of the single songs of male Savannah sparrows, Passerculus sandwichiensis, in an island population. Introductory notes did not change. The buzz segment showed similar stability; although a rare low-frequency variant appeared and then disappeared, the buzz segments from...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?