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Long‐Term Population Dynamics and Habitat Association of the Federally Threatened Spotfin Chub in the Little Tennessee River
Transactions of the American Fisheries Society ( IF 1.4 ) Pub Date : 2020-06-20 , DOI: 10.1002/tafs.10256
Jason C. Doll 1 , Luke Etchison 2 , William T. Russ 3 , Stephen J. Fraley 4
Affiliation  

Understanding the population dynamics of rare and endangered species can be difficult, particularly when a species has a narrow geographic range. The Spotfin Chub Erimonax monachus is both federally and state (North Carolina) listed as threated and is endemic to the Tennessee River basin in the southeastern United States. The Spotfin Chub was once found throughout the Tennessee River basin, but its range has been reduced to four river systems. The Little Tennessee River contains the only known population of Spotfin Chubs in North Carolina. However, current efforts are ongoing to restore populations in the Cheoah River (Little Tennessee River basin). The goal of this study was to evaluate the status of Spotfin Chubs in the Little Tennessee River and to determine potential information gaps to guide future studies. Specifically, we evaluated temporal trends of the Spotfin Chub in the river using a state–space model that incorporated multiple data sources. We additionally evaluated current habitat availability to better understand how habitat could be driving site‐level variation in abundance. We found an overall increasing trend in Spotfin Chub abundance over time, but there was substantial variation across years. By linking abundance trends to current habitat availability, we found that sites with generally more bedrock also had the highest estimated abundance. The Spotfin Chub population appears to be stable; however, determining more specific population demographics (e.g., recruitment and mortality) would improve our understanding of this threatened species.

中文翻译:

田纳西州河受联邦威胁的Spotfin船库的长期人口动态和人居协会

了解稀有和濒危物种的种群动态可能很困难,尤其是当一个物种的地理范围狭窄时。Spotfin Chub Erimonax monachus被列为受到威胁的联邦和州(北卡罗莱纳州),并且是美国东南部田纳西河流域的特有物种。Spotfin Chub曾经在田纳西州的整个流域发现,但其范围已缩小到四个河流系统。小田纳西河包含北卡罗来纳州唯一已知的Spotfin Chubs种群。但是,目前正在努力恢复Cheoah河(Little Tennessee流域)的人口。这项研究的目的是评估田纳西州小河中Spotfin幼崽的状况,并确定潜在的信息空白以指导未来的研究。具体来说,我们使用包含多个数据源的状态空间模型评估了河中Spotfin丘布的时间趋势。我们还评估了当前栖息地的可用性,以更好地了解栖息地如何驱动站点级别的丰度变化。我们发现,随着时间的推移,Spotfin Chub的丰度总体呈上升趋势,但多年来却存在很大差异。通过将丰度趋势与当前栖息地的可用性联系起来,我们发现基岩普遍较多的地点估计的丰度也最高。Spotfin Chub人口似乎稳定;但是,确定更具体的人口统计资料(例如,招募和死亡率)将增进我们对这一受威胁物种的了解。通过将丰度趋势与当前栖息地的可用性联系起来,我们发现基岩普遍较多的地点估计的丰度也最高。Spotfin Chub人口似乎稳定;但是,确定更具体的人口统计资料(例如,招募和死亡率)将增进我们对这一受威胁物种的了解。通过将丰度趋势与当前栖息地的可用性联系起来,我们发现基岩普遍较多的地点估计的丰度也最高。Spotfin Chub人口似乎稳定;但是,确定更具体的人口统计资料(例如,招募和死亡率)将增进我们对这一受威胁物种的了解。
更新日期:2020-06-20
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