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6 results for “protandry”
Elevational differences in migration phenology of Lazuli Buntings do not support selection-based hypotheses for protandry
<p>Documenting and understanding sex-specific variation in migratory phenology is important for predicting avian population dynamics. In spring, males often arrive on the breeding grounds before females (protandry), though whether these patterns result from fitness benefits versus sex-specific constraints on arrival timing remains poorly understood. Sex-specific variation in the timing of fall migration is less well-documented than in spring, in part because documenting fall departures is often limited by cryptic behaviors, lower vocalization rates, and shifting territory boundaries during this time of year. We used two years of high-resolution encounter data from radio-frequency identification (RFID)-equipped bird feeders to monitor the daily presence of male and female Lazuli Buntings (<em>Passerina</em> <em>amoena</em>) throughout the breeding season at a high and a low elevation site in Cache County, Utah, USA. These encounter data were used to estimate daily arrival and departure probabilities and to investigate possible differences in migration timing in relation to sex and elevation. At low elevation, male arrival (n=15) preceded female arrival (n=16) by approximately one week, consistent with previous research that has documented protandry in other migratory songbirds. At high elevation, however, no significant differences were found between male (n=19) and female arrival (n=6). In fall, we found little difference in departure dates between elevation or sex, or between years. Our observations are most consistent with constraint-based hypotheses explaining protandry, possibly relating to sex-specific constraints operating during the non-breeding period. We additionally emphasize the need for quantifying uncertainty in phenological estimates and importance of addressing potential differences across demographic groups. </p>
Elevational differences in migration phenology of Lazuli Buntings do not support selection-based hypotheses for protandry
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Fig. 3 in Giant Cicada Emergence, Protandry and Chorus Centers Formation as Revealed by Studies Using a Sound Trap
Fig. 3 Chorionated oocytes (mean number ± SEM) per Quesada gigas female (columns) and percentage of mature females of Q. gigas (diamonds) captured at different days after the beginning of male emergence in 2015
Fig. 2 in Giant Cicada Emergence, Protandry and Chorus Centers Formation as Revealed by Studies Using a Sound Trap
Fig. 2 Ovarian maturation status in Quesada gigas captured in 2013 at two dates after cicada emergence. a Immature ovary of Quesada gigas at 15 days after male emergence (DAME). b Mature ovary of Q. gigas with chorionated oocytes inside ovarioles at 30 DAME
Fig. 4 in Giant Cicada Emergence, Protandry and Chorus Centers Formation as Revealed by Studies Using a Sound Trap
Fig. 4 Number of cicada males (diamonds) or females (squares) collected at different days after the beginning of male emergence using the sound trap in 2015
Fig. 1 in Giant Cicada Emergence, Protandry and Chorus Centers Formation as Revealed by Studies Using a Sound Trap
Fig. 1 Sound trap used for the capture of Quesada gigas in a coffee plantation. a General perspective of the sound trap attached to a pickup. b Details of the sound trap. ❶Insecticide sprayers in the front of the horn broadcasting Q. gigas males song; ❷Recipticle for collection of dead cicadas and for insecticide recirculation
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International Brain Laboratory public data
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OpenNeuro
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