Adfluvial smallmouth bass in a tributary of Lake Huron

IF 2.4 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Great Lakes Research Pub Date : 2024-03-28 DOI:10.1016/j.jglr.2024.102335

Nicholas E. Jones, Mike Parna

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引用次数: 0

Abstract

Fish exploit opportunities within aquatic ecosystems to increase their likelihood of survival, growth, and reproduction, ultimately to maximize fitness over the entire life cycle. Fitness is increased by moving to find abiotic and biotic conditions suitable for various life history stages. Smallmouth bass (Micropterus dolomieu) are known to spawn in lakes and flowing waters displaying high nest site fidelity in both environments. Some populations of smallmouth bass are adfluvial, living as adults in lakes and ascending rivers to spawn. However, this life history variant is poorly understood, particularly in the Great Lakes. The objective of our study was to determine if smallmouth bass migrate 13 km upstream to a barrier in the Maitland River from Lake Huron. Stable isotopes were used to make inferences about the migratory status of Maitland River smallmouth bass. We found significant separation in the isotopic space for adult bass captured downstream of a migration barrier (mean δ¹³C = −18.93 ‰; mean δ¹⁵N = 11.02 ‰) compared to bass found upstream (mean δ¹³C = −26.58 ‰; mean δ¹⁵N = 15.29 ‰) river segments. Stable isotope values for juvenile bass, forage fishes, and invertebrates all grouped in similar δ¹³C isotopic space across the lower and upper river segments. Adfluvial smallmouth bass are underappreciated, yet an important life history variant supporting population biodiversity in the Great Lakes.

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休伦湖一条支流中的上流小口鲈鱼

鱼类利用水生生态系统中的各种机会来增加其生存、生长和繁殖的可能性，最终在整个生命周期中获得最大的适应能力。鱼类通过寻找适合不同生活史阶段的非生物和生物条件来提高生存能力。众所周知，小口鲈鱼（Micropterus dolomieu）在湖泊和流水中产卵，在这两种环境中都表现出很高的巢穴忠诚度。有些小口鲈鱼种群属于非水流型，成鱼生活在湖泊中，然后进入河流产卵。然而，人们对这种生活史变异知之甚少，尤其是在五大湖区。我们的研究目的是确定小口鲈鱼是否会从休伦湖洄游到梅特兰河上游 13 公里处的障碍物。我们使用稳定同位素来推断梅特兰河小口鲈鱼的洄游状况。我们发现，在洄游障碍物下游捕获的成年鲈鱼（平均δ13C = -18.93‰；平均δ15N = 11.02‰）与在上游发现的鲈鱼（平均δ13C = -26.58‰；平均δ15N = 15.29‰）相比，其同位素空间有明显的分离。鲈鱼幼鱼、饲料鱼和无脊椎动物的稳定同位素值在下游和上游河段都处于相似的 δ13C 同位素空间。上游小口鲈鱼未得到足够重视，但却是支持五大湖种群生物多样性的重要生活史变体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Great Lakes Research 生物-海洋与淡水生物学

CiteScore

5.10

自引率

13.60%

发文量

178

审稿时长

6 months

期刊介绍： Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.