{"id":{"repo_id":"lethbridge","oai_identifier":"oai:opus.uleth.ca:10133/6147"},"canonical_url":"https://search.dev.ndltd.org/etd/lethbridge/oai:opus.uleth.ca:10133/6147","repository":{"repo_id":"lethbridge","name":"University of Lethbridge","base_url":"https://opus.uleth.ca/server/oai/request"},"display":{"title":"Is the dawn chorus an adaptation to warm-up the voice in Adelaide's warbler (Setophaga adelaidae)?","abstract":"Birds sing intensely during the early morning. I test predictions of the hypothesis that this phenomenon, known as the dawn chorus (DC), is an adaptation to warm-up the voice in male Adelaide’s warblers (Setophaga adelaidae). I also analyze the effects of weather and date on the dawn chorus start time (DCST). I used songs from 29 males recorded in three different years and weather data from a MesoWest weather station. Song performance improves rapidly during the DC, but changes little after dawn. High song-rates lead to rapid improvements in vocal performance. Two out of three measures of performance peak at intermediate air temperatures (Ta). Ta, however, does not exert a strong effect on DCST. Males start to sing later with higher relative humidity, and earlier with increasing precipitation the previous day. This study lends support to the warm-up hypothesis and improves our understanding on the effects of weather on birdsong.","abstract_html":"Birds sing intensely during the early morning. I test predictions of the hypothesis that this phenomenon, known as the dawn chorus (DC), is an adaptation to warm-up the voice in male Adelaide’s warblers (Setophaga adelaidae). I also analyze the effects of weather and date on the dawn chorus start time (DCST). I used songs from 29 males recorded in three different years and weather data from a MesoWest weather station. Song performance improves rapidly during the DC, but changes little after dawn. High song-rates lead to rapid improvements in vocal performance. Two out of three measures of performance peak at intermediate air temperatures (Ta). Ta, however, does not exert a strong effect on DCST. Males start to sing later with higher relative humidity, and earlier with increasing precipitation the previous day. This study lends support to the warm-up hypothesis and improves our understanding on the effects of weather on birdsong.","abstract_has_math":false,"creators":["Vazquez-Cardona, Juleyska","University of Lethbridge. Faculty of Arts and Science"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021","date_published":"2021","updated_at":"2026-07-27T20:02:11Z","subjects":["birdsong","song performance","bioacoustics","dawn chorus","Birdsongs--Research","Animal communication--Research","Birds--Vocalization--Research","Birds--Behavior--Research","Setophaga--Research--Puerto Rico","Songbirds--Behavior--Research","Songbirds--Vocalization--Research","Songbirds--Effect of temperature on--Research","Dissertations, Academic"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["hdl:10133/6147"],"render_values":[{"text":"hdl:10133/6147","href":null,"code":true}]}]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["2021"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["birdsong","song performance","bioacoustics","dawn chorus","Birdsongs--Research","Animal communication--Research","Birds--Vocalization--Research","Birds--Behavior--Research","Setophaga--Research--Puerto Rico","Songbirds--Behavior--Research","Songbirds--Vocalization--Research","Songbirds--Effect of temperature on--Research","Dissertations, Academic"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["hdl:10133/6147"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.other","label":"Dc Description Other","values":["Birds sing intensely during the early morning. I test predictions of the hypothesis that this phenomenon, known as the dawn chorus (DC), is an adaptation to warm-up the voice in male Adelaide’s warblers (Setophaga adelaidae). I also analyze the effects of weather and date on the dawn chorus start time (DCST). I used songs from 29 males recorded in three different years and weather data from a MesoWest weather station. Song performance improves rapidly during the DC, but changes little after dawn. High song-rates lead to rapid improvements in vocal performance. Two out of three measures of performance peak at intermediate air temperatures (Ta). Ta, however, does not exert a strong effect on DCST. Males start to sing later with higher relative humidity, and earlier with increasing precipitation the previous day. This study lends support to the warm-up hypothesis and improves our understanding on the effects of weather on birdsong."]},{"key":"dc:title","label":"Title","values":["Is the dawn chorus an adaptation to warm-up the voice in Adelaide's warbler (Setophaga adelaidae)?"]}]}],"canonical_facts":{"dc:date.issued":["2021"],"dc:description.other":["Birds sing intensely during the early morning. I test predictions of the hypothesis that this phenomenon, known as the dawn chorus (DC), is an adaptation to warm-up the voice in male Adelaide’s warblers (Setophaga adelaidae). I also analyze the effects of weather and date on the dawn chorus start time (DCST). I used songs from 29 males recorded in three different years and weather data from a MesoWest weather station. Song performance improves rapidly during the DC, but changes little after dawn. High song-rates lead to rapid improvements in vocal performance. Two out of three measures of performance peak at intermediate air temperatures (Ta). Ta, however, does not exert a strong effect on DCST. Males start to sing later with higher relative humidity, and earlier with increasing precipitation the previous day. This study lends support to the warm-up hypothesis and improves our understanding on the effects of weather on birdsong."],"dc:identifier":["hdl:10133/6147"],"dc:subject":["birdsong","song performance","bioacoustics","dawn chorus","Birdsongs--Research","Animal communication--Research","Birds--Vocalization--Research","Birds--Behavior--Research","Setophaga--Research--Puerto Rico","Songbirds--Behavior--Research","Songbirds--Vocalization--Research","Songbirds--Effect of temperature on--Research","Dissertations, Academic"],"dc:title":["Is the dawn chorus an adaptation to warm-up the voice in Adelaide's warbler (Setophaga adelaidae)?"],"dc:type":["Thesis"]},"updated_at":"2026-07-27T20:02:11Z"}