Transitional Strategies of Juvenile Green Sturgeon from a Riverine to a Brackish Water Environment

IF 0.7 4区 农林科学 Q4 FISHERIES
William R. Poytress, Leo C. Polansky, Joshua J. Gruber
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引用次数: 0

Abstract

Information on habitat transitions is critical to understand whether efforts to manage the freshwater phase of juvenile green sturgeon (Acipenser medirostris) rearing habitats are feasible or beneficial. We implanted microacoustic transmitters in naturally produced age-0 juvenile green sturgeon in the Sacramento River to evaluate residency, general spatial distribution, movement rates, and downstream migration patterns over 300 river kilometers. Furthermore, we investigated whether changes in three environmental variables (discharge, turbidity, and water temperature) were associated with the beginning of movements resulting in the transition from riverine to brackish waters during their outmigration to the Sacramento-San Joaquin Delta Estuary. We captured 183 juvenile green sturgeon by trawl of which 88 were implanted with microacoustic tags. An additional 10 individuals were collected and tagged from the Red Bluff Diversion Dam rotary-screw traps. Linear mixed models showed that individuals caught by trawl had longer upper river residence times, post-tagging, than those caught by trap. Intergate velocity models showed that trap-caught individuals relocated at higher upper river reach velocities than trawl-caught fish, but there were no differences between trap- and trawl-caught fish within the middle or lower reach. Detections showed that juvenile green sturgeon began the downstream transition to brackish water habitat when discharge and turbidity increased. Temperature was not found to significantly influence the initiation of downstream migration. Both continuous and stepped downstream migration patterns were observed in each of the four cohorts, with smaller individuals being more likely to exhibit stepped migration. These data provide information that was previously unknown about the life history of the southern distinct population segment of the North American green sturgeon and can be utilized to assist with water resource management and recovery of this threatened fish species.

幼年绿鲟鱼从河水环境到咸水环境的过渡策略
有关栖息地过渡的信息对于了解管理绿鲟(Acipenser medirostris)幼鱼饲养栖息地淡水阶段的工作是否可行或有益至关重要。我们在萨克拉门托河自然生产的 0 龄绿鲟幼鱼体内植入了微型声学发射器,以评估其在 300 公里河道内的栖息地、总体空间分布、移动速率和下游洄游模式。此外,我们还研究了三个环境变量(排水量、浊度和水温)的变化是否与绿鲟在向萨克拉门托-圣华金三角洲河口外迁过程中开始从河水向咸水过渡的运动有关。我们用拖网捕获了 183 条绿鲟幼鱼,其中 88 条植入了微型声学标签。此外,我们还从红崖分流大坝的旋转螺杆诱捕器中收集并标记了另外 10 条绿鲟。线性混合模型显示,与诱捕器捕获的个体相比,拖网捕获的个体在标记后在河流上游停留的时间更长。门间速度模型显示,与拖网捕获的鱼类相比,诱捕器捕获的鱼类在上游河段的迁移速度更高,但在中游或下游河段,诱捕器捕获的鱼类与拖网捕获的鱼类没有差异。检测结果表明,当排水量和浊度增加时,绿鲟幼鱼开始向下游咸水生境过渡。温度对开始向下游洄游的影响不大。在四个组群中都观察到了连续和阶梯式的下游洄游模式,较小的个体更有可能表现出阶梯式洄游。这些数据提供了以前未知的有关北美绿鲟南部独特种群区段生活史的信息,可用于协助水资源管理和这一濒危鱼类物种的恢复。
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来源期刊
Journal of Applied Ichthyology
Journal of Applied Ichthyology 生物-海洋与淡水生物学
CiteScore
2.30
自引率
11.10%
发文量
73
审稿时长
3-8 weeks
期刊介绍: The Journal of Applied Ichthyology publishes articles of international repute on ichthyology, aquaculture, and marine fisheries; ichthyopathology and ichthyoimmunology; environmental toxicology using fishes as test organisms; basic research on fishery management; and aspects of integrated coastal zone management in relation to fisheries and aquaculture. Emphasis is placed on the application of scientific research findings, while special consideration is given to ichthyological problems occurring in developing countries. Article formats include original articles, review articles, short communications and technical reports.
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