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Ecological mechanisms regulating the dynamics of the field rotifer population in a subtropical lake: evidence from the density, reproduction, and morphology of a case rotifer, Brachionus angularis
Journal of Freshwater Ecology ( IF 1.3 ) Pub Date : 2019-01-01 , DOI: 10.1080/02705060.2018.1543141
Xin-Li Wen 1, 2 , Ying-Hao Xue 1, 3 , Gen Zhang 1 , Xian-Ling Xiang 1, 2 , Yi-Long Xi 1, 2
Affiliation  

Abstract Understanding the ecological mechanisms driving the dynamics of field rotifer populations remains a challenge in ecology. Brachionus angularis (Rotifera) is preferred in such studies because of their planktonic behavior, high fecundity, and absence of cryptic species. In this study, one-year zooplankton samples were collected twice a month from a subtropical lake and the roles of abiotic and biotic factors regulating the population dynamics of B. angularis were analyzed. The sampled B. angularis were composed of two discontinuous populations: ‘summer and autumn’ and ‘spring and winter’, segmented by high mixis rates. The ‘summer and autumn’ population had high egg ratios, but low egg volumes. Water temperature was the main factor driving temporal dynamics in density, thereby counteracting the negative effect of top-down force. Based on the synchronous dynamics of two fractions of chlorophyll-a, the densities of B. angularis, its potential competitors and predators, together with the reverse correlations between the egg ratio and population density, and Secchi-disk depth, we found that bottom-up and top-down forces were plausible factors regulating variations in population density in spring (March and April). However, the density peak of B. angularis in winter might be primarily ascribed to recruitment from the sediment. We further addressed the necessity for diverse evidence from the speciation of cryptic species, abundance, reproduction, and morphology, in understanding the population dynamics of a field rotifer population.

中文翻译:

调节亚热带湖泊轮虫种群动态的生态机制:来自轮虫密度、繁殖和形态的证据,角轮虫

摘要 了解驱动田间轮虫种群动态的生态机制仍然是生态学中的一个挑战。Brachionus angularis (Rotifera) 在这些研究中是首选,因为它们的浮游行为、高繁殖力和没有隐匿物种。在这项研究中,每个月从亚热带湖泊收集一年两次的浮游动物样本,并分析了非生物和生物因素在调节 B. angularis 种群动态中的作用。采样的 B. angularis 由两个不连续的种群组成:“夏季和秋季”和“春季和冬季”,由高混合率分割。“夏季和秋季”种群的鸡蛋比例较高,但鸡蛋体积较低。水温是驱动密度时间动态的主要因素,从而抵消了自上而下力的负面影响。基于叶绿素-a 的两个部分的同步动态、B. angularis 的密度、它的潜在竞争者和捕食者,以及卵比率和种群密度之间的反向相关性,以及 Secchi-disk 深度,我们发现底部-向上和自上而下的力量是调节春季(3 月和 4 月)人口密度变化的合理因素。然而,冬季 B. angularis 的密度峰值可能主要归因于沉积物的补充。我们进一步讨论了从隐性物种的物种形成、丰度、繁殖和形态学中获取各种证据的必要性,以了解田间轮虫种群的种群动态。连同鸡蛋比率和种群密度以及 Secchi-disk 深度之间的反向相关性,我们发现自下而上和自上而下的力量是调节春季(3 月和 4 月)种群密度变化的合理因素。然而,冬季 B. angularis 的密度峰值可能主要归因于沉积物的补充。我们进一步讨论了从隐性物种的物种形成、丰度、繁殖和形态学中获取各种证据的必要性,以了解田间轮虫种群的种群动态。连同鸡蛋比率和种群密度以及 Secchi-disk 深度之间的反向相关性,我们发现自下而上和自上而下的力量是调节春季(3 月和 4 月)种群密度变化的合理因素。然而,冬季 B. angularis 的密度峰值可能主要归因于沉积物的补充。我们进一步讨论了从隐性物种的物种形成、丰度、繁殖和形态学中获取各种证据的必要性,以了解田间轮虫种群的种群动态。冬天的 angularis 可能主要归因于沉积物的补充。我们进一步讨论了从隐性物种的物种形成、丰度、繁殖和形态学中获取各种证据的必要性,以了解田间轮虫种群的种群动态。冬天的 angularis 可能主要归因于沉积物的补充。我们进一步讨论了从隐性物种的物种形成、丰度、繁殖和形态学中获取各种证据的必要性,以了解田间轮虫种群的种群动态。
更新日期:2019-01-01
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