The wash zone and habitat use among three benthic fish species in stratified lakes

IF 1.6 3区 农林科学 Q3 FISHERIES
Mark S. Ridgway, Allan H. Bell, Trevor A. Middel, Mathew G. Wells, Courtney E. Taylor, Krystal Mitchell, Nick A. Lacombe
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引用次数: 0

Abstract

Mixing processes in lakes are important in determining sedimentation zones and in setting the so-called “wash zone”, the area of lake bottom in contact with an oscillating thermocline during wind-driven internal seiche events. The wash zone also aligns with a sharp change in sediment roughness and hardness. Taken together, these rapid changes in temperature and sediment indicate that the wash zone is a distinctive ecotone in stratified lakes. Depth stratified randomised netting was used to develop count-based habitat use models for three common benthic fish species as a function of depth or temperature covariates. Using data from two lakes with quite different wash zone depths, we show the wash zone to describe fish habitat for two of three benthic fish species by utilising the top 50% of estimated fish abundance as an indicator of habitat use. White sucker (Catostomus commersoni) habitat use was within the boundaries of the wash zone. Lake whitefish (Coregonus clupeaformis) habitat was adjacent and within the wash zone. Longnose sucker (C. catostomus) habitat use was in the deep areas of lakes dominated by sediment focusing and did not overlap white sucker. Lake whitefish habitat use overlapped both catostomids, but peak abundance of both lake whitefish and white sucker overlapped pointing to potential interactions between these species. Smaller lakes have less vigorous mixing processes and a narrower wash zone, so with a decline in lake size the likely area of the wash zone as habitat for benthic feeding fish would become smaller.

分层湖泊中三种底栖鱼类的冲洗区和生境利用
湖泊中的混合过程对于确定沉积带和设定所谓的 "冲刷带 "非常重要,所谓的 "冲刷带 "是指在风力驱动的内海冲刷事件中,湖底与摆动的温跃层接触的区域。冲刷区还与沉积物粗糙度和硬度的急剧变化相一致。综合来看,温度和沉积物的这些快速变化表明,冲刷区是分层湖泊中一个独特的生态区。利用深度分层随机撒网法为三种常见底栖鱼类建立了基于计数的生境利用模型,并将其作为深度或温度协变量的函数。利用两个冲洗区深度迥异的湖泊的数据,我们显示冲洗区利用估计鱼类丰度的前 50%作为栖息地利用指标,描述了三种底栖鱼类中两种鱼类的栖息地。白胭脂鱼(Catostomus commersoni)的栖息地使用范围在冲洗区的边界内。湖白鲑(Coregonus clupeaformis)的栖息地位于冲洗区附近和冲洗区内。长吻吮吸鱼(C. catostomus)的栖息地位于沉积物集中的湖泊深处,与白吮吸鱼的栖息地不重叠。湖白鲑的栖息地与两种鲶科鱼类重叠,但湖白鲑和白吮吸鱼的丰度峰值重叠,表明这些物种之间可能存在相互作用。较小的湖泊混合过程不太活跃,冲洗区也较窄,因此随着湖泊面积的减少,作为底栖觅食鱼类栖息地的冲洗区面积可能会变小。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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