Abstract Chraïbi VLS, Fritz SC. 2020. Assessing the hierarchy of long-term environmental controls on diatom communities of Yellowstone National Park using lacustrine sediment records. Lake Reserv Manage. 36:278–296. An ecosystem’s ability to maintain structure and function following disturbance, defined as resilience, is influenced by a hierarchy of environmental controls, including climate, surface cover, and ecological relationships that shape biological community composition and productivity. This study examined lacustrine sediment records of naturally fishless lakes in Yellowstone National Park to reconstruct the response of aquatic communities to climate and trophic cascades from fish stocking. Sediment records of diatom algae did not exhibit a distinct response to fish stocking in terms of assemblage or algal productivity. Instead, 3 of 4 lakes underwent a shift to dominance by benthic diatom species from 1935 to 1950, which suggests lower lake levels resulting from warmer, drier climatic conditions. The lake that did not undergo such a shift is fed by groundwater rather than snowmelt, suggesting a buffering effect by water source. Dissimilarity analysis shows that the diatom assemblages in all 4 lakes have become increasingly dissimilar since circa 1955, suggesting that communities have not yet stabilized from the first-order influence of climate. Thus, climate likely had a more prominent influence on diatom community structure than did manipulation of the fish community. Understanding the relative importance and interplay among abiotic and biotic stressors and the resultant resilience of an ecosystem provides implications for the adaptive management of lakes.

中文翻译：

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利用湖泊沉积物记录评估黄石国家公园硅藻群落长期环境控制的等级

摘要 Chraïbi VLS，弗里茨 SC。2020. 使用湖泊沉积物记录评估黄石国家公园硅藻群落的长期环境控制等级。湖泊保护区管理。36:278-296。生态系统在受到干扰后维持结构和功能的能力（定义为复原力）受环境控制等级的影响，包括气候、地表覆盖和塑造生物群落组成和生产力的生态关系。本研究检查了黄石国家公园天然无鱼湖的湖泊沉积物记录，以重建水生群落对气候和鱼类放养的营养级联反应。硅藻的沉积物记录在组合或藻类生产力方面对鱼类放养没有表现出明显的反应。反而，从 1935 年到 1950 年，4 个湖泊中有 3 个经历了底栖硅藻物种的主导地位转变，这表明由于温暖、干燥的气候条件导致湖泊水位较低。没有经历这种转变的湖泊是由地下水而不是融雪补给的，这表明水源有缓冲作用。差异分析表明，自 1955 年左右以来，所有 4 个湖泊中的硅藻组合变得越来越不同，这表明群落尚未从气候的一级影响中稳定下来。因此，与操纵鱼类群落相比，气候对硅藻群落结构的影响可能更为显着。了解非生物和生物压力因素之间的相对重要性和相互作用以及由此产生的生态系统恢复力，为湖泊的适应性管理提供了意义。