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Satellite transmitters reveal previously unknown migratory behavior and wintering locations of Yuma Ridgway’s Rails
Journal of Field Ornithology ( IF 0.9 ) Pub Date : 2020-09-18 , DOI: 10.1111/jofo.12344
Eamon J. Harrity 1 , Courtney J. Conway 2
Affiliation  

Preventing or reversing population declines of rare species often requires an understanding of their complete annual life cycle, but this information is lacking for many species. Such has been the case for Yuma Ridgway’s Rails (Rallus obsoletus yumanensis), a federally endangered marsh bird endemic to the Lower Colorado River Basin and Salton Sink in California, Arizona, Nevada, and Mexico. Yuma Ridgway’s Rails have been considered non‐migratory, but incidental mortalities at solar facilities > 50 km from any rail habitat called this assumption into question. We attached transmitters to 89 Yuma Ridgway’s Rails during the summers of 2017 to 2019 and documented the migratory movements of 23 rails, including three adult male Yuma Ridgway’s Rails with breeding territories in the United States that wintered in Mexico and returned to the United States the following year. The rails flew > 900 km in the fall to mangrove wetlands along the coast of Sonora and Sinaloa, Mexico, and returned to their breeding areas in the United States the following breeding season. Of the rails in our study, 40.0% (20 of 50) of adults and 21.4% (3 of 14) of juveniles initiated fall migratory movements. Our results invalidate existing paradigms about Yuma Ridgway’s Rails by demonstrating that not all individuals remain in their breeding areas throughout the year. Instead, some migrate long distances over inhospitable terrain to reach wintering areas that, in some cases, are in wetland types different from those in their breeding territories. Our results provide actionable data to expand conservation strategies to better account for the annual life cycle of this endangered species and highlight the need for United States‐Mexico cooperation, given the regular migration of this rare bird between the two countries.

中文翻译:

卫星发射器揭示了尤马·里奇韦(Yuma Ridgway)的Rails以前未知的迁徙行为和越冬位置

预防或逆转稀有物种的种群减少通常需要了解其完整的年度生命周期,但是许多物种缺少此信息。Yuma Ridgway的Rails(Rallus obsoletus yumanensis)就是这种情况),这是加利福尼亚州,亚利桑那州,内华达州和墨西哥的下科罗拉多河盆地和萨尔顿水槽特有的联邦濒危沼泽鸟。尤马·里奇韦(Yuma Ridgway)的Rails被认为是非迁移性的,但是在距任何铁路栖息地50公里以上的太阳能设施中的偶然死亡,使这一假设受到质疑。在2017年至2019年夏季,我们将发射器连接到89个尤马里奇韦(Yuma Ridgway)的轨道上,并记录了23条轨道的迁移运动,包括3个成年雄性尤马里奇韦(Yuma Ridgway)的轨道在美国繁殖地繁殖,并在墨西哥越冬并返回美国。年。铁轨在秋天坠落超过900公里,到达墨西哥索诺拉(Sonora)和锡那罗亚(Sinaloa)沿海的红树林湿地,并在下一个繁殖季节返回到美国的繁殖区。在我们研究的轨道中,有40条。0%的成年人(50之20)和21.4%(14之3)的青少年发起了秋季迁徙运动。我们的研究结果表明,并不是所有的个体都在整个繁殖季节内停留在繁殖区,从而使关于Yuma Ridgway的Rails的现有范例无效。取而代之的是,有些人在荒凉的土地上迁移很长一段距离,以到达越冬地区,在某些情况下,这些地区的湿地类型不同于其繁殖地区。我们的研究结果提供了可操作的数据,以扩展保护策略,以更好地说明该濒危物种的年度生命周期,并强调了美国与墨西哥合作的必要性,因为这两种稀有鸟类在两国之间的定期迁徙。我们的结果通过证明并非所有个体都在整个繁殖区域内停留,使有关尤马·里奇韦(Yuma Ridgway)的Rails的现有范例无效。取而代之的是,有些人在荒凉的土地上长距离迁移,到达了越冬地区,在某些情况下,越冬地区的湿地类型不同于其繁殖地区。我们的研究结果提供了可操作的数据,以扩展保护策略,以更好地说明该濒危物种的年度生命周期,并强调了美国与墨西哥合作的必要性,因为这两种稀有鸟类在两国之间的定期迁徙。我们的研究结果表明,并不是所有的个体都在整个繁殖季节内停留在繁殖区,从而使关于Yuma Ridgway的Rails的现有范例无效。取而代之的是,有些人在荒凉的土地上迁移很长一段距离,以到达越冬地区,在某些情况下,这些地区的湿地类型不同于其繁殖地区。我们的研究结果提供了可操作的数据,以扩展保护策略,以更好地说明该濒危物种的年度生命周期,并强调了鉴于这只稀有鸟类在两国之间的定期迁徙,美国与墨西哥之间开展合作的必要性。湿地类型不同于其繁殖地区。我们的研究结果提供了可操作的数据,以扩展保护策略,以更好地说明该濒危物种的年度生命周期,并强调了鉴于这只稀有鸟类在两国之间的定期迁徙,美国与墨西哥之间开展合作的必要性。湿地类型不同于其繁殖地区。我们的研究结果提供了可操作的数据,以扩展保护策略,以更好地说明该濒危物种的年度生命周期,并强调了美国与墨西哥合作的必要性,因为这两种稀有鸟类在两国之间的定期迁徙。
更新日期:2020-09-20
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