Diet and stable isotope signatures of Atlantic sturgeon (Acipenser oxyrinchus) caught in Minas Basin, Bay of Fundy, and the Saint John River, Canada

IF 2.3 2区 农林科学 Q2 FISHERIES
José L. Varela , Michael J. Dadswell , Laura Logan-Chesney , Colin Buhariwalla , Cornel Ceapa , Michael J.W. Stokesbury
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Abstract

The feeding habits of Atlantic sturgeon Acipenser oxyrinchus (AS) juveniles and sub- adults from Minas Basin (MB), and adults taken during their spawning run in the Saint John River (SJR) were investigated by stomach content and stable isotope analysis. While the diet of AS from MB was mainly composed of Corophium volutator (% index of relative importance = 98.6 %), the stomachs collected from the specimens caught in the SJR were empty. In SJR AS, no correlation was found between δ15N and C:N ratios suggesting that lipid reserves satisfy energy costs related to the spawning run. Trophic positions (TP) were estimated using isotopic data of C. volutator as the food web baseline for the region. Blood isotopic data indicated that SJR AS occupied a higher TP than MB AS (3.9 ± 0.3 and 3.7 ± 0.1, respectively), whereas the opposite was indicated by muscle data (4.0 ± 0.2 for SJR AS, and 4.5 ± 0.1 for MB AS). Isotopic niche areas estimated by standard ellipse areas and kernel utilization density analyses indicated that MB AS had a more diverse diet than SJR AS. There was no isotopic niche overlap between MB AS and SJR AS indicating that the two groups had distinct feeding grounds. These findings are directly relevant to the conservation and management of the AS, providing critical empirical data to support ecosystem-based models, particularly in the Bay of Fundy and Saint John River regions.
加拿大米纳斯盆地、芬迪湾和圣约翰河捕获的大西洋鲟(Acipenser oxyrinchus)的饮食和稳定同位素特征
通过胃内容物和稳定同位素分析,研究了米纳斯盆地(MB)大西洋鲟幼鱼和亚成鱼以及圣约翰河(SJR)产卵期间捕获的大西洋鲟成鱼的摄食习性。而来自MB的AS的饲料主要是coropopum volatator(相对重要的%指数 = 98.6 %),而在SJR捕获的标本中采集的胃是空的。在SJR AS中,δ15N与C:N之间没有相关性,这表明脂质储备满足了与产卵过程相关的能量成本。利用C. volutator的同位素数据作为该地区食物网的基线,估计了该地区的营养位置(TP)。血液同位素数据显示,SJR AS的TP含量高于MB AS(分别为3.9 ± 0.3和3.7 ± 0.1),而肌肉数据显示相反(SJR AS为4.0 ± 0.2,MB AS为4.5 ± 0.1)。根据标准椭圆面积和核利用密度估算的同位素生态位面积表明,MB AS的日粮多样性高于SJR AS。MB AS和SJR AS的同位素生态位没有重叠,表明两类动物有不同的取食场所。这些发现与AS的保护和管理直接相关,为支持基于生态系统的模型提供了关键的经验数据,特别是在芬迪湾和圣约翰河地区。
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来源期刊
Fisheries Research
Fisheries Research 农林科学-渔业
CiteScore
4.50
自引率
16.70%
发文量
294
审稿时长
15 weeks
期刊介绍: This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.
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