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History, status, and productivity of the Red-crowned Amazon Amazona viridigenalis in the Lower Rio Grande Valley of Texas
Bird Conservation International ( IF 1.6 ) Pub Date : 2020-08-25 , DOI: 10.1017/s0959270920000404
SIMON KIACZ , CLIFFORD E. SHACKELFORD , ANTHONY K. HENEHAN , DONALD J. BRIGHTSMITH

SummaryNewly established populations of endangered species can help mitigate declines elsewhere and can be a valuable genetic reservoir. When these populations are located within anthropogenic habitats, they may also help mitigate the potential biodiversity loss created by urbanization. The Red-crowned Amazon Amazona viridigenalis is an endangered species that has become naturalized in multiple urban areas throughout the United States and Mexico, and these populations may currently outnumber the population within their historical habitat. While these urban populations may hold the majority of this endangered species, very few studies have analyzed the status and trends of this species, or of threatened parrots in general, in urban areas. Our study focuses on an urban Red-crowned Amazon population in the Lower Rio Grande Valley (LRGV) of Texas: the only parrot population currently recognized as native to the United States. To determine a timeline of Red-crowned Amazon arrival and growth in the LRGV, we reviewed published literature and online citizen science databases. To quantify current population levels and trends, we conducted 412 surveys at all known roost sites throughout the LRGV from January 2016 through April 2019. We also quantified the ratio of adult and juvenile parrots at roosts. Our data suggest the species has been present in the LRGV consistently since the 1970s and showed rapid growth from the mid-1990s through roughly 2016. Roost counts suggest there is currently a minimum LRGV population of about 680 and the population has been relatively stable over the last 3.5 years. Productivity averaged 19% over three breeding seasons, suggesting successful internal reproduction. This study provides important baseline information for the management and conservation of Red-crowned Amazons in the region and provides a valuable timeline on the beginnings and trends of this recently established urban population of Amazona parrot.

中文翻译:

得克萨斯州下里奥格兰德河谷红冠亚马逊亚马逊 (Amazona viridigenalis) 的历史、地位和生产力

摘要新建立的濒危物种种群可以帮助缓解其他地方的衰退,并且可以成为宝贵的遗传资源库。当这些种群位于人为栖息地时,它们也可能有助于减轻城市化造成的潜在生物多样性丧失。红冠亚马逊绿色亚马逊是一种濒临灭绝的物种,已在美国和墨西哥的多个城市地区归化,这些种群目前可能超过其历史栖息地的种群。虽然这些城市人口可能拥有大多数这种濒临灭绝的物种,但很少有研究分析城市地区该物种或一般受威胁鹦鹉的状况和趋势。我们的研究侧重于德克萨斯州下里奥格兰德河谷 (LRGV) 的城市红冠亚马逊种群:目前唯一被认为是美国本土的鹦鹉种群。为了确定红冠亚马逊在 LRGV 中的到来和增长的时间表,我们回顾了已发表的文献和在线公民科学数据库。为了量化当前的人口水平和趋势,从 2016 年 1 月到 2019 年 4 月,我们在整个 LRGV 的所有已知栖息地进行了 412 次调查。我们还量化了栖息地成年鹦鹉和幼年鹦鹉的比例。我们的数据表明,自 1970 年代以来,该物种一直存在于 LRGV 中,并从 1990 年代中期到大约 2016 年显示出快速增长。栖息地计数表明,目前 LRGV 的最低种群数量约为 680 只,并且在整个过去 3.5 年。三个繁殖季节的生产力平均为 19%,表明内部繁殖成功。本研究为该地区红冠亚马逊河的管理和保护提供了重要的基线信息,并提供了有关这一最近建立的城市人口的开始和趋势的宝贵时间表。亚马逊鹦鹉。
更新日期:2020-08-25
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