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Wingbeat frequency of two Catharus thrushes during nocturnal migration
| Content Provider | Semantic Scholar |
|---|---|
| Author | Diehl, Robert H. Larkin, Ronald P. |
| Copyright Year | 1998 |
| Abstract | Radio transmitters emitting continuous signals were mounted on Swainsoffs Thrushes (Catharus ustulatus) and Veerys (C.fuscescens) during two spring migration seasons. Wingbeats modulated the continuous signals, and signal-processing techniques permitted examination of wingbeat frequency (WBF) during nocturnal migration. Distinct takeoff and cruising-flight phases were evident in both species. As birds climbed during the takeoff phase (which usually lasted about 15 min), WBF typically declined exponentially by at least 4 Hz. Median cruising WBF from seven flights varied from 9.2 to 10.9 Hz, values similar to those calculated from published equations predicting WBF based on flight mechanics. Cruis- ing WBF typically varied slowly and irregularly throughout all flights by about 1 Hz. During takeoff and cruising flights, all birds flapped continuously, showing no evidence of the flap- coasting pattern common in passerine migrants previously studied with other techniques such as radar. All five birds exhibited departure times, course directions, and flight distances typical for migrating thrushes. Received 23 May 1997, accepted 11 November 1997. |
| Starting Page | 591 |
| Ending Page | 601 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.2307/4089408 |
| Alternate Webpage(s) | https://sora.unm.edu/sites/default/files/journals/auk/v115n03/p0591-p0601.pdf |
| Alternate Webpage(s) | https://doi.org/10.2307/4089408 |
| Volume Number | 115 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
