Extreme drought alters frequency and reproductive success of floaters in Willow Flycatchers

Tad Theimer, Mark K. Sogge, Suzanne N. Cardinal, Scott L. Durst, E. H. Paxton

Research output: Contribution to journalArticle

Abstract

Changes in habitat quality, including those caused by extreme events like droughts and floods, could alter costs and benefits of territoriality and thereby the prevalence and reproductive consequences for individuals capable of breeding that do not do so (floaters). We studied floating behavior in a population of Southwestern Willow Flycatchers (Empidonax traillii extimus) in central Arizona during one year of extreme drought, one year of lake inundation, and three years of near average precipitation. In all years, most floaters were second year (SY) males, and most subsequently settled outside of the patch where they were detected in the floating year, suggesting that floaters did not "queue" at high-quality territories in order to achieve higher reproductive success in subsequent years. Instead, cohorts that floated in non-drought years had lower apparent survival and lower reproductive success compared to territorial birds. In the extreme drought year, however, the number of floaters was 1.5 times greater than in all other years combined, more females floated, and apparent survival and mean annual productivity in subsequent years was higher for males that floated in that year than for those that were territorial. Inundation of habitat due to rising reservoir levels did not result in an increase in floaters because many birds nested in inundated areas where trees projected above the water so that the relative amount of available habitat was not reduced to the extent habitat models predicted. Overall, our results indicate that the prevalence and reproductive and demographic consequences of floating can change under extreme climatic events like severe drought.

Original languageEnglish (US)
Pages (from-to)647-656
Number of pages10
JournalAuk
Volume135
Issue number3
DOIs
StatePublished - Jul 1 2018

Fingerprint

reproductive success
drought
habitats
habitat
bird
territoriality
birds
extreme event
habitat quality
demographic statistics
breeding
lakes
productivity
lake
cost
water

Keywords

  • territoriality

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Cite this

Extreme drought alters frequency and reproductive success of floaters in Willow Flycatchers. / Theimer, Tad; Sogge, Mark K.; Cardinal, Suzanne N.; Durst, Scott L.; Paxton, E. H.

In: Auk, Vol. 135, No. 3, 01.07.2018, p. 647-656.

Research output: Contribution to journalArticle

Theimer, Tad ; Sogge, Mark K. ; Cardinal, Suzanne N. ; Durst, Scott L. ; Paxton, E. H. / Extreme drought alters frequency and reproductive success of floaters in Willow Flycatchers. In: Auk. 2018 ; Vol. 135, No. 3. pp. 647-656.
@article{c358bc8ce7f94d49813d523df0d02c4a,
title = "Extreme drought alters frequency and reproductive success of floaters in Willow Flycatchers",
abstract = "Changes in habitat quality, including those caused by extreme events like droughts and floods, could alter costs and benefits of territoriality and thereby the prevalence and reproductive consequences for individuals capable of breeding that do not do so (floaters). We studied floating behavior in a population of Southwestern Willow Flycatchers (Empidonax traillii extimus) in central Arizona during one year of extreme drought, one year of lake inundation, and three years of near average precipitation. In all years, most floaters were second year (SY) males, and most subsequently settled outside of the patch where they were detected in the floating year, suggesting that floaters did not {"}queue{"} at high-quality territories in order to achieve higher reproductive success in subsequent years. Instead, cohorts that floated in non-drought years had lower apparent survival and lower reproductive success compared to territorial birds. In the extreme drought year, however, the number of floaters was 1.5 times greater than in all other years combined, more females floated, and apparent survival and mean annual productivity in subsequent years was higher for males that floated in that year than for those that were territorial. Inundation of habitat due to rising reservoir levels did not result in an increase in floaters because many birds nested in inundated areas where trees projected above the water so that the relative amount of available habitat was not reduced to the extent habitat models predicted. Overall, our results indicate that the prevalence and reproductive and demographic consequences of floating can change under extreme climatic events like severe drought.",
keywords = "territoriality",
author = "Tad Theimer and Sogge, {Mark K.} and Cardinal, {Suzanne N.} and Durst, {Scott L.} and Paxton, {E. H.}",
year = "2018",
month = "7",
day = "1",
doi = "10.1642/AUK-17-206.1",
language = "English (US)",
volume = "135",
pages = "647--656",
journal = "Auk",
issn = "0004-8038",
publisher = "Ornithological Societies of North America",
number = "3",

}

TY - JOUR

T1 - Extreme drought alters frequency and reproductive success of floaters in Willow Flycatchers

AU - Theimer, Tad

AU - Sogge, Mark K.

AU - Cardinal, Suzanne N.

AU - Durst, Scott L.

AU - Paxton, E. H.

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Changes in habitat quality, including those caused by extreme events like droughts and floods, could alter costs and benefits of territoriality and thereby the prevalence and reproductive consequences for individuals capable of breeding that do not do so (floaters). We studied floating behavior in a population of Southwestern Willow Flycatchers (Empidonax traillii extimus) in central Arizona during one year of extreme drought, one year of lake inundation, and three years of near average precipitation. In all years, most floaters were second year (SY) males, and most subsequently settled outside of the patch where they were detected in the floating year, suggesting that floaters did not "queue" at high-quality territories in order to achieve higher reproductive success in subsequent years. Instead, cohorts that floated in non-drought years had lower apparent survival and lower reproductive success compared to territorial birds. In the extreme drought year, however, the number of floaters was 1.5 times greater than in all other years combined, more females floated, and apparent survival and mean annual productivity in subsequent years was higher for males that floated in that year than for those that were territorial. Inundation of habitat due to rising reservoir levels did not result in an increase in floaters because many birds nested in inundated areas where trees projected above the water so that the relative amount of available habitat was not reduced to the extent habitat models predicted. Overall, our results indicate that the prevalence and reproductive and demographic consequences of floating can change under extreme climatic events like severe drought.

AB - Changes in habitat quality, including those caused by extreme events like droughts and floods, could alter costs and benefits of territoriality and thereby the prevalence and reproductive consequences for individuals capable of breeding that do not do so (floaters). We studied floating behavior in a population of Southwestern Willow Flycatchers (Empidonax traillii extimus) in central Arizona during one year of extreme drought, one year of lake inundation, and three years of near average precipitation. In all years, most floaters were second year (SY) males, and most subsequently settled outside of the patch where they were detected in the floating year, suggesting that floaters did not "queue" at high-quality territories in order to achieve higher reproductive success in subsequent years. Instead, cohorts that floated in non-drought years had lower apparent survival and lower reproductive success compared to territorial birds. In the extreme drought year, however, the number of floaters was 1.5 times greater than in all other years combined, more females floated, and apparent survival and mean annual productivity in subsequent years was higher for males that floated in that year than for those that were territorial. Inundation of habitat due to rising reservoir levels did not result in an increase in floaters because many birds nested in inundated areas where trees projected above the water so that the relative amount of available habitat was not reduced to the extent habitat models predicted. Overall, our results indicate that the prevalence and reproductive and demographic consequences of floating can change under extreme climatic events like severe drought.

KW - territoriality

UR - http://www.scopus.com/inward/record.url?scp=85047941056&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85047941056&partnerID=8YFLogxK

U2 - 10.1642/AUK-17-206.1

DO - 10.1642/AUK-17-206.1

M3 - Article

AN - SCOPUS:85047941056

VL - 135

SP - 647

EP - 656

JO - Auk

JF - Auk

SN - 0004-8038

IS - 3

ER -