环境对受控河流潮汐界限围堰上幼鳗迁入物候的影响

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Rose M. Boardman, Adrian C. Pinder, Adam T. Piper, Catherine Gutmann Roberts, Rosalind M. Wright, J. Robert Britton
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引用次数: 0

摘要

自 20 世纪 80 年代以来,欧洲濒临灭绝的溯河洄游欧洲鳗鲡(Anguilla anguilla)的繁殖率大幅下降,在其生命周期的许多方面仍存在相当大的知识差距。该研究旨在通过分析鳗鱼数量,计算鳗鱼开始洄游(占鳗鱼总数的10%,T10)、洄游高峰(50%,T50)和洄游结束(90%,T90)的年度时间,评估2009年至2019年期间英格兰三条受管制河流的鳗鱼洄游物候。在三条河流中,T10 在朱利安日("日")94 至 173 之间变化。T10 提前的年份,T50 也明显提前,T50 在第 105 天和第 200 天之间变化。洄游时间的巨大年际变化与环境变量有关;在河流温度(RTs)较高、海面温度(SST)较低的年份,以及在河流温度(RTs)高于海面温度的年份,洄游时间(T10)和洄游时间(T50)较早。没有任何环境变量能显著预测 T90。这些结果表明,虽然鳗鱼开始洄游和进入淡水的高峰时间每年都有变化,但这种变化是可以根据环境条件的不同而预测的。由于其中许多条件与温度和降水量的年度变化有关,因此气候变化有可能改变这些洄游时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Environmental influences on the phenology of immigrating juvenile eels over weirs at the tidal limit of regulated rivers

Environmental influences on the phenology of immigrating juvenile eels over weirs at the tidal limit of regulated rivers

Recruitment of the catadromous and critically endangered European eel Anguilla anguilla in Europe has declined substantially since the 1980s, with considerable knowledge gaps remaining in many aspects of their life cycle. The aim was to assess eel migration phenology in three regulated rivers in England between 2009 and 2019 through analyses of eel numbers using passes at their tidal limits, with calculation of the annual timings of migration initiation (10% of all eels passed, T10), peak (50%, T50) and conclusion (90%, T90). Across the three rivers, T10 varied between Julian Day (‘Day’) 94 and 173. Years of earlier T10 had significantly earlier T50, where T50 varied between Day 105 and 200. The considerable inter-annual variability in migration timings was associated with environmental variables; earlier T10 and T50 occurred in years of warmer river temperatures (RTs) and cooler sea surface temperatures (SST), and in years where RTs were higher than SSTs. No environmental variables were significant predictors of T90. These results indicate that whilst there is annual variability in the timing of eel migration initiation and peak into freshwaters, this variability is predictable according to differences in environmental conditions. As many of these conditions associated with annual variability in temperature and precipitation then climate change has the potential to shift these migration timings.

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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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