在被调节的河流中,流量越大,成年七鳃鳗通过的次数越多,时间越早,但通道高峰出现在年流量低的时候

IF 1.6 3区 农林科学 Q3 FISHERIES
Benjamin J. Clemens, Jeremy D. Romer, Jeffrey S. Ziller, Michelle Jones
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引用次数: 1

摘要

水坝等人工障碍物是成年太平洋七鳃鳗(Entosphenus tridentatus)试图进入上游产卵栖息地的关键限制因素或威胁。然而,在大坝通过期间对七鳃鳗进行计数(大坝计数)对于监测这些鱼类的丰度趋势是有用的。我们描述了2005-2020年麦肯齐河(美国俄勒冈州)leabburg大坝(6.7米高)七鳃鳗大坝数量的趋势。尽管两条鱼梯的流量相似,但在大多数年份,大多数七鳃鳗通过右岸鱼梯(垂直槽设计)而不是左岸鱼梯(半冰港)通过leabburg大坝。每年的七鳃鳗数量在32至176只之间(中位数= 71.5只)。赤池信息标准揭示了最适合的通用加性模型(GAM),它描述了包括“年”,“一年中的一天”和“河流流量”在内的七目鳗通过的累积比例,而不是包括较少这些变量或包括“水温”的其他GAM。七鳃鳗通常在河流流量连续减少的日子里开始洄游,大多数在每年6 - 8月的年低流量期间洄游。此外,年水坝总数与平均日河流流量的总和密切相关。因此,较高的年流量与更早和更多的七鳃鳗通道相关,但峰值通道发生在年低流量时。七鳃鳗洄游期间的日平均水温介乎7.8至14.9°C。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
More flow in a regulated river correlates with more and earlier adult lamprey passage, but peak passage occurs at annual low flows

Artificial obstructions such as dams are a key limiting factor or threat to adult Pacific lamprey (Entosphenus tridentatus) attempting to access upstream spawning habitats. Nevertheless, lamprey counted during dam passage (dam counts) is useful for monitoring abundance trends of these fish. We describe the trends in lamprey dam counts during 2005–2020 at Leaburg Dam (6.7 m height) on the McKenzie River (Oregon, USA). Despite similar flow volumes at each of two fish ladders, most lampreys in most years passed Leaburg Dam via the right bank fish ladder (vertical slot design) rather than the left bank fish ladder (half Ice Harbor). Counts ranged between 32 and 176 lampreys per year (median = 71.5 individuals). Akaike Information Criterion revealed the best fit General Additive Model (GAM) that described the cumulative proportion of lamprey passage included ‘year’, ‘day of the year’ and ‘river flow’, as opposed to other GAMs that included fewer of these variables or that included ‘water temperature’. Lamprey generally began passing during consecutive days of decreasing river flows, with most passing during annual low flows during June–August each year. In addition, total annual dam counts were strongly correlated with the sum of mean daily river flows. Thus, higher annual river flows correlate with earlier and more lamprey passage, but peak passage occurs at annual low flows. Mean daily water temperature ranged between 7.8 and 14.9°C during lamprey passage.

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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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