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Wednesday, January 30 • 11:00am - 11:20am
(WILDLIFE: AVIAN) Species Discrimination and Habitat Selection in Blue-winged and Golden-winged Warblers

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AUTHORS: Stephen A. Tyndel, University of Illinois at Urbana-Champaign; Dr. Jinelle Sperry – CERL-ERDC, University of Illinois at Urbana-Champaign; Dr. Michael P. Ward, University of Illinois at Urbana-Champaign, Illinois Natural History Survey

ABSTRACT: Blue-winged Warblers (Vermivora chrysoptera) and Golden-winged Warblers (Vermivora cyanoptera) are closely related species that hybridize frequently and produce fertile offspring yet tend to mate assortively and often hold overlapping territories. Information on how conspecific and heterospecific interactions impact settlement and habitat selection for both species is lacking.The purpose of this study was to examine the role of social information, specifically song, in habitat selection in both Blue-winged and Golden-winged warblers. Our first objective was to determine if conspecific and heterospecific song can be used to induce settlement in Blue-winged and Golden-winged warblers across their range and whether the response of each species to heterospecific song differs in allopatric and sympatric populations. Our second objective was to determine whether Blue-winged and Golden-winged Warblers males discriminate against heterospecific song and whether discrimination against heterospecific song differs in in allopatric and sympatric populations. To address the first objective, we broadcast songs of Blue-winged warblers and Golden-winged warblers in an area where only Blue-winged warblers breed, where only Golden-winged warblers breed, and where both species breed. To address the second objective, we conducted a simulated territorial intrusion experiment to compare how breeding territorial males of each species respond to heterospecific song in an area where only Blue-winged warblers breed, where only Golden-winged warblers breed, and where both species breed. Data analysis is ongoing but preliminary results for the first objective suggest the strongest response to conspecific cues occurred in the allopatric population of Golden-winged warblers with equivocal results found elsewhere. Responses to heterospecific cues were similarly ambiguous. Preliminary results for the second objective suggest strong species discrimination in sympatry and weak discrimination in allopatry. Ultimately our results will provide important insight into the relationship between these species and the role of social information in habitat selection.

Wednesday January 30, 2019 11:00am - 11:20am
CENTER STREET ROOM C

Attendees (15)