挪威二叠纪半河谷溪流中的幼年鲑鱼数量--溪床遮蔽物是否打败了大型木质碎屑?

IF 1.7 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES
Joachim B. Bretzel, Ulrich Pulg, Juergen Geist
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引用次数: 0

摘要

本研究采用点电鱼和微生境绘图方法,调查了大型木质碎屑(LWD)对挪威奥兰塞尔瓦河(Aurlandselva)半冲积侧河道中大西洋鲑(Salmo salar)和溯河褐鳟(Salmo trutta)幼鱼数量的影响。影响鱼类丰度(鱼/点)的因素不包括LWD的存在,而是河床庇护所的可用性和与产卵场的距离,与其他生境成分无关。只有当 LWD 与其他生境成分相互作用时,LWD 才会对鱼类数量产生影响。出现这种差异的原因是,在 Aurlandselva 河的特定承载能力下,庇护所丰富的粗糙底质中的洞穴可为幼鱼提供足够的掩护和领地。在低地溪流(河床坡度为 0.005)中,LWD 可以最有效地提供遮蔽,而在较陡的鲑鱼河流及相关的半河谷溪流中,维护或恢复富含遮蔽物的粗糙底质应被视为重点优先事项。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Juvenile salmonid abundance in a diamictic semi-fluvial stream in Norway—does stream bed shelter beat large woody debris?
This study investigates the effect of large woody debris (LWD) on the abundance of juvenile Atlantic salmon (Salmo salar, L.) and anadromous brown trout (Salmo trutta, L.) in semi-alluvial side channels of the river Aurlandselva (Norway) using point electrofishing and microhabitat mapping. Not the presence of LWD, but stream bed shelter availability and the distance to spawning grounds affected the fish abundance (fish/point), independent of other habitat components. LWD showed only an effect on fish abundance when in interaction with other habitat components. This discrepancy can be explained by the availability of cavities in the shelter-rich coarse substrate which provide sufficient cover and territory for juvenile fish at the given carrying capacity of river Aurlandselva. Whilst LWD may be most effective to provide shelter in lowland streams (bed slope <0.005), maintaining or restoring shelter-rich coarse substrates should be considered a key priority in steeper salmonid rivers and associated semi-fluvial streams.
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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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