Deposited sediment influences occurrence of functional traits of stream fishes

IF 1.6 3区 农林科学 Q3 FISHERIES
Mallory Hirschler, Amy Villamagna, Paul L. Angermeier, Eric Laflamme
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引用次数: 0

Abstract

To better understand stream-fish sensitivity to fine sediment, we documented assemblage-wide responses by selected traits along a sedimentation gradient. We then discuss the management implications of these ‘dose–response’ relations in the contexts of biotic assessments and conservation of sediment-sensitive species. We identified a spatial gradient in sediment deposition among streams within the upper Piedmont of the Roanoke River basin in North Carolina and Virginia. We assessed fine-sediment sensitivity of 81 species based on eight species traits stratified by four attributes: food preference, feeding location, spawning substrate and spawning behaviour. We then ranked each trait and scored each species with respect to its sediment sensitivity. Using data from electrofishing surveys during 2018–2019, we calculated proportional abundances of traits observed at 30 sites throughout the study area and grouped species by their aggregate sensitivity scores. We assessed relations between embeddedness and silt cover and occurrences of species and traits using a combination of regression and ordination approaches. All traits tested responded to embeddedness or silt cover, or both. Feeding traits exhibited the strongest responses to embeddedness, while reproductive traits exhibited the strongest responses to silt cover. Our findings indicate that negative responses of the probability of presence for high-sensitivity traits to embeddedness and silt cover were linear, with no apparent thresholds. Additionally, proportional abundances of species with multiple high-sensitivity traits were inversely related to embeddedness and silt cover. Overall, our findings regarding population-level responses to sedimentation were consistent with our findings for trait-specific responses. Our analysis of species sensitivity to fine sediment corroborated the patterns we saw in our trait-specific analyses, indicating that population responses to sedimentation can be predicted from combinations of species traits. The ‘dose–response’ relations we documented may be applicable to managing sediment impacts on fishes, especially in the contexts of biotic assessments and conservation of sediment-sensitive species.

Abstract Image

沉积物影响溪流鱼类功能特征的出现
为了更好地了解溪流鱼类对细小沉积物的敏感性,我们记录了沿沉积梯度选定特征的整个集合反应。然后,我们讨论了这些 "剂量-反应 "关系在生物评估和保护沉积物敏感物种方面的管理意义。我们确定了北卡罗来纳州和弗吉尼亚州罗阿诺克河流域皮埃蒙特上游溪流沉积物沉积的空间梯度。我们根据食物偏好、觅食地点、产卵基质和产卵行为这四个属性对 81 个物种的八个物种特征进行了分层,评估了它们对细小沉积物的敏感性。然后,我们对每个特征进行排序,并根据每个物种对沉积物的敏感性进行评分。利用 2018-2019 年期间电鱼调查的数据,我们计算了在整个研究区域 30 个地点观察到的性状的比例丰度,并根据其综合敏感性得分对物种进行了分组。我们采用回归和排序相结合的方法评估了嵌入度和淤泥覆盖度与物种和性状出现之间的关系。所有测试的性状都对嵌入度或淤泥覆盖度做出了反应,或同时对嵌入度和淤泥覆盖度做出了反应。摄食性状对嵌入度的反应最强,而繁殖性状对淤泥覆盖度的反应最强。我们的研究结果表明,高灵敏度性状的存在概率对嵌入度和淤泥覆盖度的负响应是线性的,没有明显的阈值。此外,具有多种高敏感性特征的物种的丰度比例与嵌入度和淤泥覆盖度成反比。总体而言,我们在种群水平上对沉积作用的反应与我们在特异性反应方面的发现是一致的。我们对物种对细小沉积物敏感性的分析证实了我们在特异性分析中发现的模式,表明种群对沉积作用的反应可以通过物种特质的组合来预测。我们记录的 "剂量-反应 "关系可能适用于管理沉积物对鱼类的影响,特别是在生物评估和保护沉积物敏感物种的背景下。
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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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