Ontogenetic shifts by juvenile fishes highlight the need for habitat heterogeneity and connectivity in river restoration

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Twan Stoffers, Anthonie D. Buijse, Jan Jaap Poos, Johan A. J. Verreth, Leopold A. J. Nagelkerke
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引用次数: 0

Abstract

Large-scale anthropogenic river modifications have caused the loss of critical floodplain nursery habitats for riverine fish, leading to population declines. Restoration efforts have been implemented to recover these habitats, but with varying success. Understanding how larval and juvenile fish use habitats in dynamic river environments is essential for improving restoration strategies. We assessed ontogenetic shifts in habitat use by young-of-the-year fishes in the lower Rhine, analyzing 2167 samples across 18 restored floodplains over three growing seasons (2018–2020). Five distinct nursery habitats were identified: (1) exposed, fast-flowing habitats with coarse substrate; (2) turbid, nonflowing areas with high turbidity and chlorophyll; (3) shallow, vegetated habitats with macrophytes and shoreline vegetation; (4) deeper, sheltered habitats with structural complexity; and (5) shallow, slow-flowing areas. Habitat use shifted significantly with ontogeny across species. Larvae generally preferred shallow habitats (< 50-cm depth), either in slow-flowing areas (e.g., asp, ide, monkey goby, nase, and whitefin gudgeon) or vegetated zones with macrophytes (e.g., bleak, bitterling, bream, round goby, and zander). Juveniles increasingly used deeper habitats (> 50-cm depth), favoring fast-flowing areas (e.g., asp, barbel, ide), or deeper, nonflowing habitats (e.g., bream, zander). Our findings thus highlight the critical importance of habitat heterogeneity and connectivity for riverine fish biodiversity. Restoration strategies should prioritize the creation of a mosaic of shallow, low-velocity habitats for larvae, alongside deeper, fast-flowing, or sheltered areas for juveniles. Additionally, the movement of rheophilic species from floodplain habitats to the main river channel emphasizes the need for maintaining continuous connectivity between floodplains and the river.

Abstract Image

幼鱼的个体发生变化强调了河流恢复过程中栖息地异质性和连通性的必要性
大规模的人为河流改造已经导致河流鱼类重要的洪泛区苗圃栖息地的丧失,导致种群数量下降。已经实施了恢复这些栖息地的努力,但取得了不同的成功。了解动态河流环境中幼鱼和幼鱼如何利用栖息地对改善恢复策略至关重要。我们评估了莱茵河下游年幼鱼栖息地利用的个体发生变化,分析了18个恢复洪泛平原的2167个样本,涵盖了三个生长季节(2018-2020)。发现了5种不同的苗圃生境:(1)暴露、快速流动、基材粗糙的生境;(2)浊度高、叶绿素含量高的浑浊、不流动区域;(3)有大型植物和岸线植被的浅层植被生境;(4)结构复杂的深层遮蔽生境;(5)浅水、慢流区。生境利用随物种间个体发育发生显著变化。幼虫一般喜欢浅生境(<;50厘米深),无论是在流动缓慢的地区(例如,asp, ide,猴虾虎鱼,nase,和白鳍鲟鱼),还是在有大型植物的植被区(例如,暗淡,苦鱼,鲷鱼,圆虾虎鱼和zander)。幼鱼越来越多地使用较深的栖息地(>;50厘米深),有利于快速流动的区域(如asp, barbel, ide),或更深,不流动的栖息地(如鲷,zander)。因此,我们的研究结果强调了生境异质性和连通性对河流鱼类生物多样性的重要性。恢复策略应该优先考虑为幼虫创造一个浅的、低流速的栖息地,以及为幼鱼创造更深的、快流速的或遮蔽的区域。此外,从洪泛区栖息地到主要河道的流变物种的运动强调了保持洪泛区和河流之间连续连通性的必要性。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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