Differences in bacterial community composition between fish-stocked and fishless lakes from an arid Patagonian plateau

IF 2.2 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY
Carmen Sabio y García, Sol Porcel, M. Romina Schiaffino, Julio Lancelotti, María Cristina Marinone, Sebastián Metz, Ignacio Roesler, Irina Izaguirre
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Abstract

Bacterial community composition (BCC) can be modulated by different indirect and direct factors. The Strobel Lake Plateau (Patagonia, Argentina) holds natural fishless lakes. Fish introduction in some of these lakes has affected the structure of their zooplankton, phytoplankton and autotrophic picoplankton communities, whereas its effects on bacterioplankton are unknown. Hence, we analyzed BCC to assess the potential effect of fish introduction on this community in lakes of this region. We sampled fishless and fish-stocked lakes during three summer campaigns and analyzed the BCC. Our results revealed a contrasting arrangement in the main limnological variables and significant differences in the BCC between fishless and stocked lakes. In fish-stocked lakes, Alphaproteobacteria class had a higher proportion and SAR11_cladeIII was the most abundant amplicon sequence variant (ASV); these lakes also showed a marginally higher mean richness but less exclusive ASVs. Environmental and biotic factors contributed to explain BCC variations. The lower percentage of exclusive ASVs and the closer BCC ordination in a non-metric multidimensional scaling suggest a homogenizing effect in fish-stocked lakes. This study contributes to understand the consequences of fish introduction on the plankton communities in lakes of this invaluable region for biodiversity conservation.

Abstract Image

巴塔哥尼亚干旱高原有鱼湖和无鱼湖细菌群落组成的差异
细菌群落组成(BCC)可由不同的间接和直接因素调节。斯特罗贝尔湖高原(阿根廷巴塔哥尼亚)拥有天然无鱼湖泊。在其中一些湖泊中引入鱼类影响了浮游动物、浮游植物和自养微小浮游生物群落的结构,但对浮游细菌群落的影响尚不清楚。因此,我们对 BCC 进行了分析,以评估引入鱼类对该地区湖泊中这一群落的潜在影响。我们在三次夏季活动中对无鱼湖泊和有鱼湖泊进行了采样,并对 BCC 进行了分析。我们的结果显示,无鱼湖泊和有鱼湖泊的主要湖沼学变量和 BCC 存在显著差异。在放养鱼类的湖泊中,Alphaproteobacteria 类所占比例较高,SAR11_cladeIII 是最丰富的扩增子序列变异体(ASV);这些湖泊的平均丰富度也略高,但 ASV 的排他性较低。环境和生物因素有助于解释 BCC 的变化。在非度量多维尺度中,排他性ASV的比例较低,BCC排序较为接近,这表明在鱼类放养的湖泊中存在同质化效应。这项研究有助于了解鱼类引进对这一宝贵地区湖泊浮游生物群落的影响,从而保护生物多样性。
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来源期刊
Hydrobiologia
Hydrobiologia 生物-海洋与淡水生物学
CiteScore
5.40
自引率
11.50%
发文量
288
审稿时长
4.9 months
期刊介绍: Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.
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