01926nas a2200193   4500008004100000245009400041210006900135520130600204653001401510653001701524653002101541653002001562653002101582653001801603653001701621100002901638700002401667856004101691       2019                        eng d00aHow Early Do Birds Start Chirping? Dawn Chorus Onset and Peak Times in a Neotropical City0 aHow Early Do Birds Start Chirping Dawn Chorus Onset and Peak Tim3 a<p>Urbanisation poses important challenges for animal communication. Avian dawn choruses are a prominent component of urban soundscapes and have received attention in recent urban ecology studies. Current evidence based on comparisons of urban and non-urban sites suggest that urbanisation is associated with earlier dawn chorus singing activity. However, this phenomenon remains mainly unexplored in tropical cities. We here assessed dawn chorus onset and peak times in two contrasting conditions of the urbanisation intensity gradient (i.e., intra-urban and peri-urban forested areas) of a Neotropical city, Xalapa in Mexico, assessing relationships with noise at sunrise and artificial light at night. We found no differences in dawn chorus onset or singing peak times when contrasting intra- and peri-urban areas. However, we found non-significant trends for earlier chorus onsets and peak times with increasing noise levels. Our results show no relationship between artificial light at night and dawn chorus timing, adding evidence to recent studies showing that light pollution does not seem to be determinant in the dawn choruses of tropical birds. Further research is needed to include a wider array of urbanisation conditions and drivers of the singing routines of urban tropical birds.</p>
10abehaviour10abioacoustics10abird assemblages10amorning singing10aperi-urban areas10aUrban ecology10aurbanisation1 aMarín-Gómez, Oscar, H.1 aMacGregor-Fors, Ian  uhttps://bio.acousti.ca/fr/node/58395