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首页> 美国卫生研究院文献>other >Diet characterization and a preliminary investigation into trophic niche placement for an endangered lake sturgeon (Acipenser fulvescens) population in the Saskatchewan River SK Canada
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Diet characterization and a preliminary investigation into trophic niche placement for an endangered lake sturgeon (Acipenser fulvescens) population in the Saskatchewan River SK Canada

机译：加拿大萨斯喀彻温省濒临灭绝的湖st（Acipenser fulvescens）种群的营养特征和营养位置的初步调查

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All Canadian lake sturgeon (Acipenser fulvescens) populations are listed under the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) due to their complex life history, loss of habitat and negative interactions with anthropomorphic activities. Lake sturgeon diets vary considerably across their range and depend on the local benthic invertebrate fauna, substrata, and competition with congener species. Hence, determining population-specific prey assemblages is a vital contribution to effective conservation efforts. We used carbon and nitrogen stable isotopes to identify lake sturgeon prey preferences for juvenile (<100 cm) and adult (>100 cm) age classes and their trophic niche in the Saskatchewan River, SK, Canada. In this system, lake sturgeon were the top predator within the benthic food web with no direct competition for preferred prey items from congener species. Their diet was dominated by crayfish (49.1± 6.4%) and snails (36.3 ± 5.5%), with no significant differences between age classes. Furthermore, lake sturgeon favoured deep rocky pools throughout the river; a habitat where crayfish and snails are typically found. Therefore, conservation efforts should be directed at preserving these habitats for the residing benthic invertebrate community, and the lake sturgeon’s ability to access them.
机译：由于其复杂的生活史，栖息地的丧失以及与拟人活动的负面相互作用，所有加拿大lake鱼（Acipenser fulvescens）种群均被列入加拿大濒危野生生物状况委员会（COSEWIC）。 st鱼的饮食在其整个范围内变化很大，并取决于当地的底栖无脊椎动物区系，地层以及与同类动物的竞争。因此，确定针对特定人群的猎物组合对有效的保护工作至关重要。我们使用碳和氮稳定同位素确定了加拿大萨斯喀彻温河幼年（<100厘米）和成年（> 100厘米）年龄段的lake鱼猎物偏好及其营养位。在这个系统中，lake鱼是底栖食物网中的主要捕食者，与同类动物的首选猎物没有直接竞争。他们的饮食以小龙虾（49.1±6.4％）和蜗牛（36.3±5.5％）为主，不同年龄段之间无显着差异。此外，st鱼更喜欢整个河水深处的岩石池。通常会发现小龙虾和蜗牛的栖息地。因此，保护​​工作应针对保留底栖无脊椎动物社区的这些栖息地，以及st鱼进入这些栖息地的能力。

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