当前位置: X-MOL 学术Water Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Responses of fish to nationwide improvements in the water quality of a densely populated and heavily modified country over four decades
Water Research ( IF 11.4 ) Pub Date : 2025-01-18 , DOI: 10.1016/j.watres.2025.123163
Andy D. Nunn, Rachel F. Ainsworth, Yueming Qu, Virginie D.J. Keller, Nuria Bachiller-Jareno, Vasileios Antoniou, Michael Eastman, Clarissa Rizzo, Graeme Peirson, Frances Eley, Andrew C. Johnson, Ian G. Cowx

Globally, fish have been severely affected by the widespread, chronic degradation of fresh waters, with a substantial proportion of species declining in abundance or range in recent decades. This has especially been the case in densely populated countries with an industrial heritage and intensive agriculture, where the majority of river catchments have been affected by deteriorations in water quality and changes in land use. This study used a spatially and temporally extensive dataset, encompassing 16,124 surveys at 1180 sites representing a wide range of river typologies and pressures, to examine changes in the fish populations of England's rivers over four decades (1980s–2010s). The analyses revealed gradual, nationwide increases in mean fish species richness and diversity across the range of pressure gradients. In the majority of cases, increases were most pronounced in the 1980s, since when any further changes have been comparatively minor, but there were no declining trends across the full time series. There were also temporal, nationwide changes in fish assemblage structure, driven largely by variations in the densities of brown trout Salmo trutta or roach Rutilus rutilus, but no consistent increases in the abundance of sensitive, pollution-intolerant species in response to improvements in wastewater treatment and, consequently, water quality. Although the increases in fish species richness and diversity over the last four decades are encouraging, subtle and contrasting changes in the abundance of a range of species require further investigation, and causal relationships between fish assemblage structure and putative drivers should be modelled at a national scale. This study is the first to examine long-term, nationwide trends in the freshwater fish populations of England, and significantly advances our understanding of the ecological health of rivers in densely populated and heavily modified countries.

中文翻译:


四十年来鱼类对人口稠密和严重改造国家水质改善的反应



在全球范围内,鱼类受到淡水广泛、长期退化的严重影响,近几十年来,很大一部分物种的数量或范围下降。在拥有工业遗产和集约化农业的人口稠密国家尤其如此,那里的大多数河流集水区都受到水质恶化和土地利用变化的影响。本研究使用了一个空间和时间上广泛的数据集,包括在 1180 个地点进行的 16,124 项调查,代表了广泛的河流类型和压力,以研究英格兰河流鱼类种群在四十年(1980 年代至 2010 年代)的变化。分析显示,在压力梯度范围内,全国平均鱼类物种丰富度和多样性逐渐增加。在大多数情况下,增长在 1980 年代最为明显,因为当时任何进一步的变化都相对较小,但在整个时间序列中没有下降趋势。鱼类组合结构也发生了时间性的、全国性的变化,这主要是由于褐鳟鱼 Salmo trutta 或蟑螂 Rutilus rutilus 的密度变化,但敏感、不耐污染物种的数量没有持续增加,以响应废水处理的改善,从而改善了水质。尽管过去四十年中鱼类物种丰富度和多样性的增加令人鼓舞,但一系列物种丰度的微妙和对比变化需要进一步调查,并且应在国家范围内对鱼类组合结构和假定驱动因素之间的因果关系进行建模。 这项研究首次考察了英格兰淡水鱼种群的长期全国趋势,并显着促进了我们对人口稠密和严重改造国家河流生态健康状况的理解。
更新日期:2025-01-18
down
wechat
bug