Implications of climate‐change‐induced stressors and water management for sterlet populations in the Middle and Upper River Danube

IF 1.7 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
Martin Šindler, Maroš Kubala, Dušan Senko, Martin Mišík, Gábor Guti, Ladislav Pekárik, Bořek Drozd
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Abstract

Sturgeons are a group of iconic rheophilic fish whose populations worldwide are currently undergoing significant declines. The study investigates the impact of climate change and anthropogenic activities, particularly the Gabčíkovo barrage system, on the survival and distribution of the sterlet, the last surviving sturgeon species in the Middle and Upper Danube River, specifically in the river part rkm 1708–1920 divided into three river sections: PT1 (Danube river part 1: rkm 1708–Gabčíkovo impoundment), PT2 (Danube river part 2: rkm 1854–1920), and PT3 (Old Danube part 3: rkm 1850–1810). Between years 1996 and 2020, water temperatures in the Danube River (PT1, PT2) rose by over 1°C on average, with the Old Danube (PT3) experiencing an alarming average increase of 3.5°C (df = 2, F = 145.03, p = <2.2e‐16). Consequently, suitable sterlet habitat (depth ≥4 m) in the Old Danube (PT3) now covers only 11% of its total area compared with 67% in PT1 and 75% in PT2 (flow rate = 1924.27 m3 s−1) due to altered flow regimes, water levels, and siltation. Sterlets are increasingly caught in an artificial channel below to the Gabčíkovo Hydroelectric Power Plant (80%–90% of annual total catch), suggesting a shift in their distribution patterns. Conversely, there has been a notable decline in sterlet populations in other river sections, including a decrease in a section with moderate ecological status according to Water Frame Directive criteria. In light of these findings, the study proposes several mitigation measures to improve the status of the sterlet population in the area.
气候变化诱发的压力因素和水资源管理对多瑙河中上游甲鱼种群的影响
鲟鱼是一类标志性的嗜流性鱼类,其数量目前正在全球范围内显著下降。本研究调查了气候变化和人为活动(尤其是加布奇科沃拦河坝系统)对鲟鱼(多瑙河中上游最后幸存的鲟鱼物种)的生存和分布的影响,特别是在 rkm 1708-1920 河段,分为三个河段:PT1(多瑙河第 1 部分:rkm 1708-Gabčíkovo蓄水池)、PT2(多瑙河第 2 部分:rkm 1854-1920)和 PT3(老多瑙河第 3 部分:rkm 1850-1810)。从 1996 年到 2020 年,多瑙河(PT1、PT2)的水温平均上升了 1°C 以上,而老多瑙河(PT3)的水温平均上升了 3.5°C,令人震惊(df = 2,F = 145.03,p = <2.2e-16)。因此,由于水流状态、水位和淤积的改变,老多瑙河(PT3)适宜的蝶类栖息地(水深≥4 米)目前仅占其总面积的 11%,而 PT1 和 PT2 的这一比例分别为 67% 和 75%(流速 = 1924.27 立方米/秒-1)。在加布奇科沃水电站下方的人工河道中,越来越多的黄貂鱼被捕获(占年捕获总量的 80%-90% ),这表明它们的分布模式发生了变化。相反,其他河段的赤鲤数量明显减少,包括根据《水框架指令》标准处于中等生态状态的河段。鉴于这些发现,该研究提出了几项缓解措施,以改善该地区的髭鲷种群状况。
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来源期刊
River Research and Applications
River Research and Applications 环境科学-环境科学
CiteScore
4.60
自引率
9.10%
发文量
158
审稿时长
6 months
期刊介绍: River Research and Applications , previously published as Regulated Rivers: Research and Management (1987-2001), is an international journal dedicated to the promotion of basic and applied scientific research on rivers. The journal publishes original scientific and technical papers on biological, ecological, geomorphological, hydrological, engineering and geographical aspects related to rivers in both the developed and developing world. Papers showing how basic studies and new science can be of use in applied problems associated with river management, regulation and restoration are encouraged as is interdisciplinary research concerned directly or indirectly with river management problems.
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