Sierra Nevada Willow Flycatcher Decline Continues but Losses Abate at Two Restored Meadows

Q4 Agricultural and Biological Sciences Western Birds Pub Date : 2022-02-01 DOI:10.21199/wb53.1.5
Helen L. Loffland, Lynn N. Schofield, R. Siegel, B. Christman
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引用次数: 3

Abstract

Willow Flycatcher (Empidonax traillii) populations have been declining across the western United States for decades. The Sierra Nevada–southern Cascades population in California is especially vulnerable, with fewer than 200 pairs remaining. Hydrologic restoration has been recommended for conserving this population. Other riparian songbirds have increased in response to restoration, but little is known about how restoration has affected the Willow Flycatcher. The Little Truckee River has long been a stronghold for the Willow Flycatcher, and the demography of the population there was studied intensively from the late 1990s through 2010. Baseline data from that study provided an opportunity to gauge the species’ response to pond-and-plug restoration projects completed at two meadows within the study area in 2009 and 2010. We aggregated and analyzed data from Willow Flycatcher surveys from 1997 through 2019 at the two restored meadows as well as nine nearby unrestored meadows with at least two Willow Flycatcher territories at some time during the demographic study. At most meadows, the number and density of Willow Flycatcher territories declined over the two-decade study period. However, losses at the unrestored meadows were significantly greater than at the restored meadows, where territory density clearly did not collapse following the disturbance caused by restoration and then remained largely stable thereafter. Within large meadows already occupied by Willow Flycatchers, meadow restoration that restores hydrologic function and increases flooding over creekbanks may be an effective strategy for stabilizing declining Willow Flycatcher populations in the Sierra Nevada.
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内华达山脉的柳树捕蝇器数量继续下降,但在两个恢复的草地上损失减少
几十年来,美国西部的捕柳蝇(emidonax traillii)种群数量一直在下降。加州内华达山脉-南喀斯喀特山脉的种群尤其脆弱,只剩下不到200对。建议通过水文恢复来保护这一种群。其他河岸鸣禽的数量也随着恢复而增加,但人们对恢复对捕柳鸟的影响知之甚少。小特拉基河长期以来一直是柳捕蝇器的大本营,从20世纪90年代末到2010年,人们对那里的人口进行了深入研究。该研究的基线数据提供了一个机会来衡量该物种对2009年和2010年在研究区域内的两个草甸完成的池塘和塞子修复项目的反应。我们汇总并分析了1997年至2019年在两个恢复的草地以及附近9个未恢复的草地进行的柳捕蝇调查的数据,这些草地在人口统计研究期间的某个时候至少有两个柳捕蝇区。在20年的研究期间,大多数草甸的捕柳区数量和密度都有所下降。然而,未恢复草地的领土密度损失明显大于恢复草地,恢复草地的领土密度明显没有在恢复干扰后崩溃,之后基本保持稳定。在已经被柳捕蝇占据的大片草地上,恢复草地的水文功能和增加河岸的洪水可能是稳定内华达山脉不断下降的柳捕蝇种群的有效策略。
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来源期刊
Western Birds
Western Birds Agricultural and Biological Sciences-Animal Science and Zoology
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