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首页> 外文学位 >Stable isotope analysis (delta nitrogen-15 and delta carbon-13) and bioenergetic modeling of spatial-temporal foraging patterns and consumption dynamics in brown and rainbow trout populations within catch-and-release areas of Arkansas tailwaters.
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Stable isotope analysis (delta nitrogen-15 and delta carbon-13) and bioenergetic modeling of spatial-temporal foraging patterns and consumption dynamics in brown and rainbow trout populations within catch-and-release areas of Arkansas tailwaters.

机译：阿肯色州尾水捕捞与释放区域内褐鳟和虹鳟种群的稳定同位素分析（δ氮15和δ13碳）和时空觅食模式和消耗动态的生物能模型。

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摘要

I examined spatial and temporal consumption dynamics using an energy intake model and a bioenergetics model of rainbow trout, Oncorhynchus mykiss, and brown trout, Salmo trutta, within three catch-and-release (C-R) areas in Bull Shoals and Norfork tailwaters to determine whether trout populations were limited by food supply. I also examined the seasonal and ontogenetic shifts in the foraging patterns of brown and rainbow trout within these areas using gut content analysis (GCA) and stable isotope analysis (SIA) of C and N. I examined 605 brown trout and 768 rainbow trout for GCA and SIA at Bull Shoals, Norfork, and Sylamore C-R areas. For growth analysis and abundance estimates, I tagged a total of 11,423 brown and rainbow trout. Mean rainbow trout densities were higher (47 to 342 fish*ha-1) than brown trout (3 to 84 fish*ha-1) at all C-R areas. The Norfork C-R area contained the highest densities of brown and rainbow trout. Benthic macroinvertebrates at Bull Shoals and Norfork were 14.0 to 18.7 times higher in biomass than at Sylamore. Biomass of sculpin was approximately 2 to 8 times higher at Norfork than Bull Shoals and Sylamore. I found a high proportion of filamentous algae, Cladophora, and a nuisance diatom, Didymosphenia geminata in the diets of rainbow trout (15--91%), despite the apparent lack of energetic value from this food source. Generally, SIA mixing model results provided broad ranges of source contributions rather than more informative narrow ranges of solutions limiting the conclusions regarding food source contributions. Large rainbow trout failed to consume sufficient food biomass to exceed maintenance ration and exhibited slow or negative seasonal growth suggesting poorer energetic conditions existed for this size class and species. In contrast, brown trout experienced high growth rates at lower densities than rainbow trout. Growth rate differences between brown and rainbow trout may be from brown trout shifting towards the incorporation of more energetically profitable prey fish. These findings suggest rainbow trout, and not brown trout, in Arkansas tailwater C-R areas were limited by spatial-temporal fluctuations in food availability.
机译：我使用了能量吸收模型和虹鳟Oncorhynchus mykiss和褐鳟Salmo trutta的能量吸收模型和生物能学模型，研究了牛滩和诺福克尾水的三个捕捞与释放（CR）区域内的空间和时间消耗动态。鳟鱼种群受到粮食供应的限制。我还使用C和N的肠道含量分析（GCA）和稳定同位素分析（SIA）研究了这些地区褐鳟和虹鳟觅食方式的季节性变化和个体发育变化。我研究了GCA的605条褐鳟和768条虹鳟以及在Bull Shoals，诺福克和Sylamore CR地区的SIA。为了进行生长分析和丰度估计，我总共标记了11,423条褐鳟和虹鳟。在所有C-R地区，平均虹鳟鱼密度（47至342条鱼* ha-1）高于褐鳟（3至84条鱼* ha-1）。诺福克C-R区的棕鳟和虹鳟鱼密度最高。 Bull Shoals和Norfork的底栖大型无脊椎动物的生物量比Sylamore高出14.0至18.7倍。牛for草的生物量大约比公牛浅滩和西拉莫尔高2至8倍。我发现虹鳟鱼的饮食中有很高比例的丝状藻类（Cladophora）和令人讨厌的硅藻Didymosphenia geminata（15--91％），尽管这种食物来源显然缺乏能量价值。通常，SIA混合模型的结果提供了广泛的来源贡献，而不是提供更多信息的狭窄范围的解决方案，从而限制了有关食物来源贡献的结论。大型虹鳟未能消耗足够的食物生物量以超过维持率，并且表现出缓慢或负的季节性增长，表明该规模等级和物种的活力状况较差。相比之下，褐鳟在比虹鳟低的密度下具有较高的生长速度。褐鳟和虹鳟之间的生长率差异可能是由于褐鳟转向合并了更具能量效益的猎物。这些发现表明，阿肯色州尾水C-R地区的虹鳟鱼而非褐鳟鱼受到食物供应时空波动的限制。

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  • 作者

    Flinders, Jon M.;

  • 作者单位

    University of Arkansas.;

  • 授予单位 University of Arkansas.;
  • 学科 Aquatic sciences.;Zoology.;Ecology.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 230 p.
  • 总页数 230
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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