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Zhang J, Chen X, Soetaert K, Xu Y. The relative roles of multiple drivers on benthic ciliate communities in an intertidal zone. MARINE POLLUTION BULLETIN 2023; 187:114510. [PMID: 36577240 DOI: 10.1016/j.marpolbul.2022.114510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 11/29/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Intertidal biodiversity is being severely disrupted as a result of increased anthropogenic activity. However, our knowledge about how natural gradients, human induced disturbance and biotic interactions affect biodiversity is limited. So, we investigated how three facets of alpha diversity and community composition of benthic ciliates responded to environmental and biological gradients in the intertidal zone of Zhejiang, China. The key determinants and their relative effects on ciliate communities were identified using structural equation modeling, distance-based redundancy analysis and variation partitioning analysis. Our results revealed that sediment grain size was the most important factor affecting alpha diversity and community composition. Human induced eutrophication had significant effects on phylogenetic alpha diversity and community composition. However, the effects of biotic interactions on ciliate communities were relatively small. Moreover, we found community composition was more sensitive to human disturbance than alpha diversity, thus, more suitable for indicating human-induced eutrophication.
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Affiliation(s)
- Jiawei Zhang
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
| | - Xinyi Chen
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
| | - Karline Soetaert
- Department of Estuarine and Delta Systems, NIOZ Royal Netherlands Institute for Sea Research, PO Box 140, 4400AC Yerseke, the Netherlands
| | - Yuan Xu
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China; Yangtze Delta Estuarine Wetland Ecosystem Observation and Research Station, Ministry of Education & Shanghai Science and Technology Committee, Shanghai 202162, China.
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Segovia BT, Domingues CD, Meira BR, Lansac-Toha FM, Fermani P, Unrein F, Lobão LM, Roland F, Velho LFM, Sarmento H. Coupling Between Heterotrophic Nanoflagellates and Bacteria in Fresh Waters: Does Latitude Make a Difference? Front Microbiol 2016; 7:114. [PMID: 26903993 PMCID: PMC4749720 DOI: 10.3389/fmicb.2016.00114] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 01/22/2016] [Indexed: 11/19/2022] Open
Abstract
Recent studies reported comparatively lower heterotrophic bacteria (HB) abundances in tropical regions, indicating that factors involved in bacterial losses could be more relevant in the tropics. Heterotrophic nanoflagellates (HNF) are considered the main predators of HB in aquatic ecosystems, and one should expect higher abundances in the tropics because of differences in the food web configuration (absence of large daphnids). However, there are no comprehensive studies comparing HB and HNF abundances in a latitudinal gradient. We hypothesized that HB abundance would be lower in the tropics because HNF abundance would be higher, resulting in a tighter HNF–HB coupling. To test this hypothesis, we compiled a large dataset of HB and HNF abundances from tropical and temperate freshwater environments. We found that both HB and HNF abundances were lower in the tropical region, and that HNF-HB coupling does not differ between temperate and tropical regions. The lower HNF abundance and lack of coupling may be explained by a strong top-down control on HNF and/or their herbivory preference. Besides, no relationship was found between bacterial specific growth rate and either chlorophyll-a and HB abundance, indicating that bacterial losses may have an important role in tropical freshwaters. Thus, we found that HNF is likely not the main controllers of HB abundance, and that grazing by ciliates and cladocerans, together with the physiological effects of higher temperatures, may explain the high bacterial loss rates in the tropics.
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Affiliation(s)
- Bianca T Segovia
- Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá Maringá, Brazil
| | - Carolina D Domingues
- Departamento de Botânica, Universidade Federal do Rio de Janeiro Rio de Janeiro, Brazil
| | - Bianca R Meira
- Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá Maringá, Brazil
| | - Fernando M Lansac-Toha
- Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá Maringá, Brazil
| | - Paulina Fermani
- Instituto Tecnológico de Chascomús, Universidad Nacional de San Martín Chascomús, Argentina
| | - Fernando Unrein
- Instituto Tecnológico de Chascomús, Universidad Nacional de San Martín Chascomús, Argentina
| | - Lúcia M Lobão
- Departamento de Ecologia, Universidade Federal de Juiz de Fora Juiz de Fora, Brazil
| | - Fabio Roland
- Departamento de Ecologia, Universidade Federal de Juiz de Fora Juiz de Fora, Brazil
| | - Luiz F M Velho
- Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá Maringá, Brazil
| | - Hugo Sarmento
- Departamento de Hidrobiologia, Universidade Federal de São Carlos São Carlos, Brazil
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Zingel P, Agasild H, Karus K, Kangro K, Tammert H, Tõnno I, Feldmann T, Nõges T. The influence of zooplankton enrichment on the microbial loop in a shallow, eutrophic lake. Eur J Protistol 2015; 52:22-35. [PMID: 26555735 DOI: 10.1016/j.ejop.2015.09.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 09/14/2015] [Accepted: 09/19/2015] [Indexed: 11/25/2022]
Abstract
With increasing primary productivity, ciliates may become the most important members of the microbial loop and form a central linkage in the transformation of microbial production to upper trophic levels. How metazooplankters, especially copepods, regulate ciliate community structure in shallow eutrophic waters is not completely clear. We carried out mesocosm experiments with different cyclopoid copepod enrichments in a shallow eutrophic lake to examine the responses of ciliate community structure and abundance to changes in cyclopoid copepod biomass and to detect any cascading effects on bacterioplankton and edible phytoplankton. Our results indicate that an increase in copepod zooplankton biomass favours the development of small-sized bacterivorous ciliates. This effect is unleashed by the decline of predaceous ciliate abundance, which would otherwise graze effectively on the small-sized ciliates. The inverse relationship between crustacean zooplankton and large predaceous ciliates is an important feature adjusting not only the structure of the ciliate community but also the energy transfer between meta- and protozooplankton. Still we could not detect any cascading effects on bacterio- or phytoplankton that would be caused by the structural changes in the ciliate community.
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Affiliation(s)
- Priit Zingel
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia
| | - Helen Agasild
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia
| | - Katrit Karus
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia.
| | - Kersti Kangro
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia; Tartu Observatory, Tõravere, Tartu County 61602, Estonia
| | - Helen Tammert
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia
| | - Ilmar Tõnno
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia
| | - Tõnu Feldmann
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia
| | - Tiina Nõges
- Centre for Limnology, Institute of Agricultural and Environmental Research, Estonian University of Life Sciences, Rannu 61117, Tartu, Estonia
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Kalinowska K, Guśpiel A, Kiersztyn B, Chróst RJ. Factors controlling bacteria and protists in selected Mazurian eutrophic lakes (North-Eastern Poland) during spring. AQUATIC BIOSYSTEMS 2013; 9:9. [PMID: 23566491 PMCID: PMC3626790 DOI: 10.1186/2046-9063-9-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 03/28/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND The bottom-up (food resources) and top-down (grazing pressure) controls, with other environmental parameters (water temperature, pH) are the main factors regulating the abundance and structure of microbial communities in aquatic ecosystems. It is still not definitively decided which of the two control mechanisms is more important. The significance of bottom-up versus top-down controls may alter with lake productivity and season. In oligo- and/or mesotrophic environments, the bottom-up control is mostly important in regulating bacterial abundances, while in eutrophic systems, the top-down control may be more significant. RESULTS The abundance of bacteria, heterotrophic (HNF) and autotrophic (ANF) nanoflagellates and ciliates, as well as bacterial production (BP) and metabolically active cells of bacteria (CTC, NuCC, EST) were studied in eutrophic lakes (Mazurian Lake District, Poland) during spring. The studied lakes were characterized by high nanoflagellate (mean 17.36 ± 8.57 × 103 cells ml-1) and ciliate abundances (mean 59.9 ± 22.4 ind. ml-1) that were higher in the euphotic zone than in the bottom waters, with relatively low bacterial densities (4.76 ± 2.08 × 106 cells ml-1) that were lower in the euphotic zone compared to the profundal zone. Oligotrichida (Rimostrombidium spp.), Prostomatida (Urotricha spp.) and Scuticociliatida (Histiobalantium bodamicum) dominated in the euphotic zone, whereas oligotrichs Tintinnidium sp. and prostomatids Urotricha spp. were most numerous in the bottom waters. Among the staining methods used to examine bacterial cellular metabolic activity, the lowest percentage of active cells was recorded with the CTC (1.5-15.4%) and EST (2.7-14.2%) assay in contrast to the NuCC (28.8-97.3%) method. CONCLUSIONS In the euphotic zone, the bottom-up factors (TP and DOC concentrations) played a more important role than top-down control (grazing by protists) in regulating bacterial numbers and activity. None of the single analyzed factors controlled bacterial abundance in the bottom waters. The results of this study suggest that both control mechanisms, bottom-up and top-down, simultaneously regulated bacterial community and their activity in the profundal zone of the studied lakes during spring. In both lake water layers, food availability (algae, nanoflagellates) was probably the major factor determining ciliate abundance and their composition. In the bottom waters, both groups of protists appeared to be also influenced by oxygen, temperature, and total phosphorus.
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Affiliation(s)
- Krystyna Kalinowska
- Polish Academy of Sciences, Centre for Ecological Research, Hydrobiological Station, ul. Leśna 13, Mikołajki, 11-730, Poland
| | - Adam Guśpiel
- Department of Microbial Ecology, Institute of Botany, Faculty of Biology, University of Warsaw, ul. Miecznikowa 1, Warsaw, 02-096, Poland
| | - Bartosz Kiersztyn
- Department of Microbial Ecology, Institute of Botany, Faculty of Biology, University of Warsaw, ul. Miecznikowa 1, Warsaw, 02-096, Poland
| | - Ryszard J Chróst
- Department of Microbial Ecology, Institute of Botany, Faculty of Biology, University of Warsaw, ul. Miecznikowa 1, Warsaw, 02-096, Poland
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Pestová D, Macek M, Elena Martínez Pérez M. Ciliates and their picophytoplankton-feeding activity in a high-altitude warm-monomictic saline lake. Eur J Protistol 2007; 44:13-25. [PMID: 17931843 DOI: 10.1016/j.ejop.2007.04.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2007] [Revised: 04/19/2007] [Accepted: 04/23/2007] [Indexed: 10/22/2022]
Abstract
The impact of feeding on autotrophic picoplankton (APP) on the ciliate composition of the assemblage was surveyed monthly along a depth gradient in the maar crater, athalassohaline, warm monomictic Lake Alchichica (Puebla, Mexico) from June 2003 to December 2005. Numbers of APP were evaluated from their autofluorescence. DAPI staining and the Fluorescently Labeled Bacteria technique were employed to count ciliates and estimate their feeding rates. A total of 38 taxa of ciliates have been identified using Quantitative Protargol Staining. Peritrichs followed by minute spirotrichs (particularly Halteria grandinella) often numerically dominated the ciliate assemblage and emerged as the most efficient APP feeders. A maximum of 54 ciliate cells ml(-1) was observed in the surface layer at the end of the mixing period, during the development of diatoms (Cyclotella alchichicana), the cyanobacterial bloom (Nodularia sp.) and its decay. Vorticellids (Pelagovorticella natans, Vorticella sp.) had the highest APP uptake (median 130 APP cil(-1) h(-1)). Mixotrophic Euplotes cf. daidaleos were important APP grazers near the oxycline. Scuticociliates (Cyclidium glaucoma, Uronema nigricans and an anaerobic cf. Isocyclidium globossum), were numerically dominant within the hypolimnetic assemblages and did not ingest APP. Generally, APP were not an important food source for the majority of the ciliate assemblage, being positively selected by a few species during the APP decay in aerobic and microaerobic conditions.
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Affiliation(s)
- Dana Pestová
- Universidad Nacional Autónoma de México campus Iztacala, Av. de los Barrios 1, los Reyes Iztacala, Tlalnepantla, 54090 Edo. Mexico, Mexico.
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Zingel P, Agasild H, Nõges T, Kisand V. Ciliates are the dominant grazers on pico- and nanoplankton in a shallow, naturally highly eutrophic lake. MICROBIAL ECOLOGY 2007; 53:134-42. [PMID: 17186145 DOI: 10.1007/s00248-006-9155-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2006] [Revised: 07/12/2006] [Accepted: 07/28/2006] [Indexed: 05/13/2023]
Abstract
Abundance and biomass of the microbial loop members [bacteria, heterotrophic nanoflagellates (HNF), and ciliates] were seasonally measured in the naturally eutrophic and shallow (2.8 mean depth) Lake Võrtsjärv, which has a large open surface area (average 270 km2) and highly turbid water (Secchi depth <1 m). Grazing rates (filter feeding rates) on 0.5-, 3-, and 6-microm-diameter particles were measured to estimate pico- and nanoplankton grazing (filter feeding) by micro- and metazooplankton. Among grazers, HNF had a low abundance (<50 cells mL-1) and, due to their low specific filtering rates, they only grazed a minor fraction of the bacterioplankton (<or=4.2% of total grazing). Ciliates were relatively abundant (<or=158 cells mL-1) and, considering their high specific feeding rates, were able to graze more than 100% of the bacterial biomass production in the open part of the lake, whereas the average daily grazing accounted for 9.3% of the bacterial standing stock. Ciliates were potentially important grazers of nanoplanktonic organisms (on average, approximately 20% of the standing stock of 3-microm-size particles was grazed daily). Metazooplankton grazed a minor part of the bacterioplankton, accounting for only 0.1% of standing stock of bacteria. Grazing on nanoplankton (3-6 microm) by metazooplankton was higher (0.4% of standing stock). The hypothesis is proposed that ciliates dominate due to a lack of top-down regulation by predators, and HNF have a low abundance due to strong grazing pressure by ciliates.
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Affiliation(s)
- Priit Zingel
- Institute of Agricultural and Environmental Sciences, Võrtsjärv Centre for Limnology, Estonian University of Life Sciences, Rannu, 61101, Tartu County, Estonia
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Shannon SP, Chrzanowski TH, Grover JP. Prey food quality affects flagellate ingestion rates. MICROBIAL ECOLOGY 2007; 53:66-73. [PMID: 17186152 DOI: 10.1007/s00248-006-9140-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2006] [Revised: 06/21/2006] [Accepted: 07/10/2006] [Indexed: 05/13/2023]
Abstract
Flagellate feeding efficiency appears to depend on morphological characteristics of prey such as cell size and motility, as well as on other characteristics such as digestibility and cell surface characteristics. Bacteria of varying morphological characteristics (cell size) and mineral nutrient characteristics or food quality (as determined by the C:N:P ratio) were obtained by growing Pseudomonas fluorescens in chemostats at four dilution rates (0.03, 0.06, 0.10, and 0.13 h-1) and three temperatures (14 degrees C, 20 degrees C, and 28 degrees C). Cells of a given food quality were heat-killed and used to grow the flagellate Ochromonas danica. Ingestion and digestion rates were determined by using fluorescently labeled bacteria of the same food quality as the bacteria supporting growth. Ingestion rates were affected by both food quality and cell size. Cells of high food quality (low carbon:element ratio) were ingested at higher rates than cells of low food quality. Multiple regression analysis indicated that cell size also influenced ingestion rate but to a much lesser extent than did food quality. Digestion rates were not correlated with either food quality or cell size. Results suggest that flagellates may adjust feeding efficiency based on the quality of food items available.
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Affiliation(s)
- S Paul Shannon
- Department of Biology, The University of Texas at Arlington, Arlington, TX 76019, USA
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Simek K, Pernthaler J, Weinbauer MG, Hornák K, Dolan JR, Nedoma J, Masín M, Amann R. Changes in bacterial community composition and dynamics and viral mortality rates associated with enhanced flagellate grazing in a mesoeutrophic reservoir. Appl Environ Microbiol 2001; 67:2723-33. [PMID: 11375187 PMCID: PMC92931 DOI: 10.1128/aem.67.6.2723-2733.2001] [Citation(s) in RCA: 189] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacterioplankton from a meso-eutrophic dam reservoir was size fractionated to reduce (<0.8-microm treatment) or enhance (<5-microm treatment) protistan grazing and then incubated in situ for 96 h in dialysis bags. Time course samples were taken from the bags and the reservoir to estimate bacterial abundance, mean cell volume, production, protistan grazing, viral abundance, and frequency of visibly infected cells. Shifts in bacterial community composition (BCC) were examined by denaturing gradient gel electrophoresis (DGGE), cloning and sequencing of 16S rDNA genes from the different treatments, and fluorescence in situ hybridization (FISH) with previously employed and newly designed oligonucleotide probes. Changes in bacterioplankton characteristics were clearly linked to changes in mortality rates. In the reservoir, where bacterial production about equaled protist grazing and viral mortality, community characteristics were nearly invariant. In the "grazer-free" (0.8-microm-filtered) treatment, subject only to a relatively low mortality rate (approximately 17% day(-1)) from viral lysis, bacteria increased markedly in concentration. While the mean bacterial cell volume was invariant, DGGE indicated a shift in BCC and FISH revealed an increase in the proportion of one lineage within the beta proteobacteria. In the grazing-enhanced treatment (5-microm filtrate), grazing mortality was approximately 200% and viral lysis resulted in mortality of 30% of daily production. Cell concentrations declined, and grazing-resistant flocs and filaments eventually dominated the biomass, together accounting for >80% of the total bacteria by the end of the experiment. Once again, BCC changed strongly and a significant fraction of the large filaments was detected using a FISH probe targeted to members of the Flectobacillus lineage. Shifts of BCC were also reflected in DGGE patterns and in the increases in the relative importance of both beta proteobacteria and members of the Cytophaga-Flavobacterium cluster, which consistently formed different parts of the bacterial flocs. Viral concentrations and frequencies of infected cells were highly significantly correlated with grazing rates, suggesting that protistan grazing may stimulate viral activity.
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Affiliation(s)
- K Simek
- Hydrobiological Institute of the Academy of Sciences of the Czech Republic, University of South Bohemia, Na sádkách 7, CZ-37005 Ceské Budejovice, Czech Republic.
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Hahn MW, Höfle MG. Grazing of protozoa and its effect on populations of aquatic bacteria. FEMS Microbiol Ecol 2001; 35:113-121. [PMID: 11295449 DOI: 10.1111/j.1574-6941.2001.tb00794.x] [Citation(s) in RCA: 236] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Predation by bacterivorous protists in aquatic habitats can influence the morphological structure, taxonomic composition and physiological status of bacterial communities. The protistan grazing can result in bacterial responses at the community and the species level. At the community level, grazing-induced morphological shifts have been observed, which were directed towards either larger or smaller bacterial sizes or in both directions. Morphological changes have been accompanied by changes in taxonomic community structure and bacterial activity. Responses at the species level vary from species to species. Some taxa have shown a pronounced morphological plasticity and demonstrated complete or partial shifts in size distribution to larger growth forms (filaments, microcolonies). However, other taxa with weak plasticity have shown no ability to reduce grazing mortality through changes in size. The impact of protistan grazing on bacterial communities is based on the complex interplay of several parameters. These include grazing selectivity (by size and other features), differences in sensitivity of bacterial species to grazing, differences in responses of single bacterial populations to grazing (size and physiology), as well as the direct and indirect influence of grazing on bacterial growth conditions (substrate supply) and bacterial competition (elimination of competitors).
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Å imek K, Vrba J, Hartman P. Size-selective feeding by Cyclidium sp. on bacterioplankton and various sizes of cultured bacteria. FEMS Microbiol Ecol 1994. [DOI: 10.1111/j.1574-6941.1994.tb00102.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Nixdorf B, Arndt H. Seasonal Changes in the Plankton Dynamics of a Eutrophic Lake Including the Microbial Web. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/iroh.19930780309] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Arndt H, Krocker M, Nixdorf B, Köhler A. Long-term Annual and Seasonal Changes of Meta- and Protozooplankton in Lake Müggelsee (Berlin): Effects of Eutrophication, Grazing Activities, and the Impact of Predation. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/iroh.19930780308] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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