偏爱吃小型浮游生物的裸裂贻贝可能有利于蓝藻的生长:伊利湖西部的实验证据

IF 0.8 4区 环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES Aquatic Ecosystem Health & Management Pub Date : 2024-05-01 DOI:10.14321/aehm.026.04.100
Carrick H.J., VanCuren C., Slate A., Denef V.J., Dahal N., Carter G., Fanslow D., Glyshaw P., Vanderploeg H.A.
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引用次数: 0

摘要

在此,我们提供了实验证据,证明入侵贻贝(Dreissena)的摄食会对伊利湖西部的浮游生物自然组合(包括异养和光养成分)产生影响。2018 年按季节(5 月、6 月、7 月、8 月、10 月)进行了五次贻贝摄食实验。从 7 个 20 L 中置池中(3 个对照池,4 个贻贝池)收集了捕食前和捕食后的样本,并使用显微镜进行细胞计数分析。实验结果表明,在所有日期,蝶形花都是浮游生物的积极食草动物,显微镜测量的贻贝清除率与根据叶绿素和荧光探针估算的贻贝清除率之间有显著的对应关系(斯皮尔曼等级相关性,r=0.45,和 r=0.48,分别为 p<0.05)。不同分类群的清除率(毫升毫克-1 小时-1)各不相同,似乎与周围浮游生物群的丰度有关(范围 1.70 至 25.00,平均值 ± SE 11.70 ± 1.33)。狄瑞森氏藻持续捕食纳米级的异养浮游生物和光养浮游生物,这些浮游生物构成了伊利湖食物网的关键营养环节。吃得最多的浮游生物是光营养隐花植物(Rhodomonas minuta 和 Cryptomonas spp.)、中心硅藻(Cyclotella sp.和 Discotella spp.)和非色素蛹单胞藻(Chromulina sp.和 Ochromonas sp.)。相反,蓝藻(如微囊藻)、甲藻(Gymnodinium varians)和一些簇生叶绿藻(Desmodesmus、Pediastrum)的清除率较低;这些浮游生物群出现在特定的时间窗口(单因素方差分析,p<0.05)。我们的研究结果表明,潜在的贻贝食草会抑制纳米浮游生物大小范围内典型的、无害的浮游生物物种,从而有利于伊利湖西部出现较少食用的、较大的蓝藻和叶绿藻物种。
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Preferential dreissenid mussel grazing on small plankton can favor cyanobacteria: Experimental evidence from western Lake Erie
Herein we provide experimental evidence for the effects invasive mussels (Dreissena) grazing can exert on a natural assemblage of plankton that included both hetero- and photo-trophic components in western Lake Erie. Five mussel feeding experiments were performed seasonally in 2018 (May, June, July August, October). Pre- and post-grazing samples were collected from seven 20-L mesocosms (3 control, 4 mussel), and analyzed using microscope cell counts. Results from our experiments showed that Dreissena were active grazers of plankton on all dates, with significant correspondence between mussel clearance rates measured using microscopy versus size-specific chlorophyll and FluoroProbe based estimates (Spearman rank correlation, r=0.45, and r=0.48, respectively, p<0.05). Clearance rates (ml mg-1 h-1) were variable among taxonomic groups and seemed to track the abundance of ambient plankton assemblage (range 1.70 to 25.00, mean ± SE 11.70 ± 1.33). Dreissena grazed consistently on nano-sized hetero- and phototrophic plankton that constituted key trophic linkages in the Lake Erie foodweb. The most actively grazed plankton were phototrophic cryptophytes (Rhodomonas minuta, Cryptomonas spp.), centric diatoms (Cyclotella sp. and Discotella spp.), and non-pigmented chrysomonads (Chromulina sp., Ochromonas sp.). Conversely, clearance rates were low for cyanobacteria (e.g. Microcystis), dinoflagellates (Gymnodinium varians), and some colonial chlorophytes (Desmodesmus, Pediastrum); these plankton groups occurred during specific temporal windows (one-way ANOVA, p<0.05). Our results indicate the potential mussel grazing can suppress typical, non-harmful plankton species in the nanoplankton size range, thereby favoring the occurrence of less-edible, larger cyanobacteria and chlorophyte species in western Lake Erie.
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来源期刊
Aquatic Ecosystem Health & Management
Aquatic Ecosystem Health & Management 环境科学-海洋与淡水生物学
CiteScore
1.70
自引率
0.00%
发文量
1
审稿时长
18-36 weeks
期刊介绍: The journal publishes articles on the following themes and topics: • Original articles focusing on ecosystem-based sciences, ecosystem health and management of marine and aquatic ecosystems • Reviews, invited perspectives and keynote contributions from conferences • Special issues on important emerging topics, themes, and ecosystems (climate change, invasive species, HABs, risk assessment, models)
期刊最新文献
Impacts of dreissenid mussel growth and activity on phytoplankton and nutrients in Lake Erie's western basin Calibration versus computation: Comparison between 1D and 3D phytoplankton simulations in western Lake Erie Nitrification in the water column of Lake Erie: Seasonal patterns, community dynamics, and competition with cyanobacterial harmful algal blooms Dynamics of dissolved organic phosphorus in the nearshore of eastern Lake Erie Seasonal interactions between Quagga Mussel grazing and phytoplankton in western Lake Erie: The view from different measuring technologies
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