纤毛虫群摄食模式二十年的变化反映了水库营养负荷

Diversity Pub Date : 2024-09-01 DOI:10.3390/d16090534
Miroslav Macek, Jaroslav Vrba, Josef Hejzlar, Klára Řeháková, Jiří Jarošík, Michal Šorf, Karel Šimek
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引用次数: 0

摘要

自 "微生物循环 "概念提出以来,人们对淡水中纤毛虫重要性的认识发生了巨大变化,这反映了在方法学方面的尝试。我们分析了斯拉皮水库(捷克伏尔塔瓦河)在两个不同营养负荷定义时期的表层(0-3 米)纤毛虫组合的二十年(1994-2018 年)数据。我们根据纤毛虫的摄食行为,对原肠霉素浸渍定量制剂中已识别、定量和生物量评估的纤毛虫进行了分组。我们绘制了纤毛虫采样中位数和四分位数间距数据图,并将模拟水龄、营养物质、细菌、异养纳米鞭毛虫和罗单胞菌作为主要解释性背景变量。我们通过多元分析验证了不同时期之间的差异。从年平均值来看,过滤微小浮游生物的物种在组合中占主导地位(halteriids 和 minute strobilidiids,其次是 peritrichs)。在春季浮游植物高峰期之前,藻类狩猎乌贼、Balanion planctonicum 和过滤纳米浮游生物的纤毛虫具有重要意义,此时纤毛虫的生物量达到最大值,反映了混养纳米浮游生物过滤纤毛虫的情况。只有在这种情况下,纤毛虫的生物量才会紧跟其量化的猎物。异养型和混养型 Askenasia 和 Lagynophrya 是典型的捕食性/捕食浮游动物的纤毛虫;只有 Mesodinium 属在秋季达到最大值。观察到的水库低营养化现象增加了表层纤毛虫的生物量,这与浮游生物生态学小组(PEG)模型一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Two-Decade Changes in the Ciliate Assemblage Feeding Pattern Reflect the Reservoir Nutrient Load
The perception of the importance of ciliate in freshwater has changed dramatically since the “microbial loop” conceptualisation, reflecting methodological attempts. The data from two decades (1994–2018) on the surface (0–3 m) ciliate assemblage in the Slapy reservoir (Vltava River, Czech Republic) during two different nutrient-load defined periods were analysed. We grouped the identified, quantified, and biomass-evaluated ciliates in the quantitative protargol-impregnated preparations according to their feeding behaviour. The sampling median and interquartile range data of the ciliates were plotted; the modelled water age, nutrients, bacteria, heterotrophic nanoflagellates, and Rhodomonas spp. were applied as the main explanatory background variables. We validated the differences between the periods, engaging multivariate analyses. The picoplankton-filtering species dominated the assemblages in an annual mean (halteriids and minute strobilidiids followed by peritrichs). Algae hunting urotrichs, Balanion planctonicum, and nanoplankton filtering tintinnids were significant before the spring phytoplankton peak when a maximum of ciliate biomass reflected mixotrophic nanoplankton filtering pelagostrombidiids. Only there did ciliate biomass tightly follow their quantified prey. Heterotrophic and mixotrophic Askenasia and Lagynophrya were typical raptorial/flagellate-hunting cilates; only Mesodinium spp. reached the maximum during autumn. The observed oligotrophication of the reservoir increased the ciliate assemblage biomass in the surface layer during stratification in concordance with the Plankton Ecology Group (PEG) model.
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