Stabilising effects of karstic groundwater on stream fish communities

IF 1.6 3区 农林科学 Q3 FISHERIES
Nathaniel P. Hitt, Karli M. Rogers, Karmann G. Kessler, Martin A. Briggs, Jennifer H. Fair
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引用次数: 2

Abstract

Although groundwater exchange processes are known to modulate atmospheric influences on stream temperature and flow, the implications for ecological stability are poorly understood. Here, we evaluated temporal change in stream fish communities across a gradient of groundwater influence defined by karst terrain (carbonate parent materials) within the Potomac River basin of eastern North America. We surveyed 12 sites in 2022 that had been sampled 29–30 years previously with similar methods. We also collected stream temperature data from each site and used the regression slope of the air-water temperature relationship to index stream thermal sensitivity and groundwater exchange processes. Sites in karst terrain exhibited strong groundwater controls on stream temperature, and fish communities were more stable over time in these locations than elsewhere. However, stream thermal sensitivity was a stronger predictor of species persistence than the spatial distribution of karst terrain in contributing areas, highlighting the ecological importance of local variation in groundwater discharge processes. The presence of calcium precipitates (marl) in stream substrates was associated with low thermal sensitivity and ecological stability over time, and we suggest such visible features may be a useful indicator of climate change refugia in stream ecosystems.

Abstract Image

岩溶地下水对溪流鱼类群落的稳定作用
虽然已知地下水交换过程可以调节大气对河流温度和流量的影响,但对其对生态稳定性的影响却知之甚少。在这里,我们评估了北美东部波托马克河流域由喀斯特地形(碳酸盐母质)定义的地下水影响梯度中溪流鱼类群落的时间变化。我们在2022年调查了12个地点,这些地点在29-30年前用类似的方法进行了采样。我们还收集了每个站点的河流温度数据,并使用空气-水温关系的回归斜率来指示河流的热敏性和地下水交换过程。喀斯特地形的地点表现出强烈的地下水对溪流温度的控制,这些地点的鱼类群落随着时间的推移比其他地方更稳定。然而,与喀斯特地形的空间分布相比,河流热敏性对物种持久性的预测能力更强,这凸显了地下水排放过程局部变化的生态重要性。随着时间的推移,河流基质中钙沉淀(泥灰岩)的存在与低热敏性和生态稳定性有关,我们认为这些可见特征可能是河流生态系统中气候变化避难所的有用指标。
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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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