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Widespread ciliate and dinoflagellate mixotrophy may contribute to ecosystem resilience in a subarctic sea: the northern Gulf of Alaska Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2024-01-18 Suzanne L. Strom, Kelley J. Bright, Kerri A. Fredrickson
ABSTRACT: Mixotrophy among ciliates and dinoflagellates in the northern Gulf of Alaska (NGA) was widespread during spring and summer, with mixotrophs contributing a median of 38 to 61% of total ciliate plus dinoflagellate biomass depending on season and year. The proportional contribution of mixotrophs was higher during a heatwave year (2019) than during a year of average temperatures (2018). The most
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Distinct bacterial communities associated with photosynthetic picoeukaryotes in Lake Dongting throughout the seasonal cycle as revealed by flow cytometry sorting Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-10-26 Shengnan Li, Zhanxin Li, Hua Peng, Li Yu, Min Wang, Zhongyuan Shen, Qianhong Gu
ABSTRACT: Associations and interactions between bacteria and phytoplankton are prevalent in aquatic systems. However, the coexistence of bacteria with the smallest phytoplankton groups is mostly unknown. Here, the associated bacteria (AB) of photosynthetic picoeukaryotes (PPEs) in the Yangtze-connected Lake Dongting were studied using flow cytometry sorting combined with high-throughput sequencing
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Spatial and temporal dynamics of coastal benthic microbial communities along a salinity gradient Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-09-14 H. Cecilie Petersen, Rumakanta Sapkota, Anna-Lotta Hiillos, Benni W. Hansen, Gary T. Banta, K. Emily Knott
ABSTRACT: The Baltic Sea is a unique brackish water ecosystem that has been studied for decades; however, knowledge about the diversity of the benthic communities of bacteria and microbial eukaryotes within this system is sparse. Using an amplicon sequencing approach, we evaluated alpha and beta diversity of shallow-water coastal microbial sediment communities and their relationship to several environmental
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Comparison of swab DNA extraction methods for examining sea star dermal microbiomes Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-08-31 Carolyn Prentice, Alyssa-Lois M. Gehman, Colleen T. E. Kellogg
ABSTRACT: Marine invertebrates are surrounded by and interact with an array of microbes, yet their microbiomes remain largely unexplored. With a seemingly endless choice of nucleic acid extraction kits, there is a need to assess the compatibility across approaches to determine whether microbiome results are comparable across studies employing different extraction methods. In this study, 5 kits were
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Biological mechanisms underlying priming of vascular plant material in the presence of diatoms Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-08-03 Patricia Bonin, Aurélie Portas, Julie Hardy, Sophie Guasco, Thomas S. Bianchi, Nicolas D. Ward, Jean-François Rontani
ABSTRACT: Priming effects that stimulate increased degradation of refractory organic matter by microorganisms following fresh organic matter input is a well-known phenomenon in terrestrial environments but remains controversial in marine environments. We used a combination of chemical (gas chromatography-EI quadrupole time of flight mass spectrometry) and molecular biology (DNA stable-isotope probing
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Temporal niche partitioning of Skeletonema: seasonal succession of the community composition in surface water of Tokyo Bay Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-07-20 Yuki Yoshinaka, Yakun Liu, Toshiya Katano, Kenji Yoshino, Kenta Nishiyama, Saori Yasui-Tamura, Fuminori Hashihama
ABSTRACT: The diatom Skeletonema spp. frequently blooms in both the winter and summer seasons of coastal waters worldwide and consists of several cryptic species. However, their seasonal pattern of species occurrence is not yet well understood in Tokyo Bay, Japan, where Skeletonema spp. frequently cause blooms. The species composition and cell density of Skeletonema spp. were investigated monthly from
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Compositional responses of aquatic bacterial communities and their network interactions to phytoplankton-derived dissolved organic matter from freshwater ponds Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-05-25 Fajun Yan, Junpeng Wang, Jun Dong, Yongan Zhu, Jiaren Yan, Jinlu Zhang, Hong Lu, Zhenhai Yu, Guojing Xu
ABSTRACT: Bacteria play a central role in the degradation of phytoplankton-derived dissolved organic matter (P-DOM) particularly in algal-blooming aquatic systems; yet our understanding of the interaction between bacteria and P-DOM is still poor. We supplied differential P-DOM that varied in concentration and molecular weight (released from distinct phytoplankton collected from blue-green algal-blooming
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Choice of methodology and surrogate prey are decisive for the quality of protistan bacterivory rate estimates Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-03-30 Javier Florenza, Stefan Bertilsson
ABSTRACT: Microeukaryote predation on bacteria is a fundamental phenomenon to understand energy and nutrient dynamics at the base of the aquatic food web. To date, the most prevalent way to estimate grazing rates is by using epifluorescence microscopy to enumerate ingestion events of fluorescently labelled tracers (FLTs) after short-term incubation experiments. However, this approach can be sensitive
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Photosynthetic picoeukaryotes significantly affect global oceanic meta-metabolism: cellular and genome streamlining confer ecological success Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-03-23 D. Derilus, C. E. Burdyshaw, F. Pinero, S. E. Massey
ABSTRACT: Photosynthetic picoeukaryotes (PPEs) are characterized by a reduction in cell and genome size but are free living, in contrast to many other organisms that have undergone such reductions. The relative abundance of PPEs in the oceans remains to be determined, as do the evolutionary imperatives behind their cell and genome reduction. Their enigmatic nature may be deciphered through metagenomics
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Interaction between temperature and salinity stress on the physiology of Dinophysis spp. and Alexandrium minutum: implications for niche range and blooming patterns Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2023-03-23 Pilar Rial, Marta Sixto, José Antonio Vázquez, Beatriz Reguera, Rosa I. Figueroa, Pilar Riobó, Francisco Rodríguez
ABSTRACT: Abrupt changes in environmental conditions in estuaries and coastal waters have direct (physiological) and indirect (through changes in water column stability) effects on planktonic microalgae. Understanding and quantifying these effects is important to improve harmful algal bloom predictive models. Dinophysis spp. (D. acuminata, D. acuta and D. caudata) and Alexandrium minutum produce toxins
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Carbon-nitrogen association influences response of the microplankton food web to enrichment Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-12-15 Junwen Guo, Sonia Brugel, Agneta Andersson, Mehdi Cherif
ABSTRACT: In aquatic ecosystems, there are 2 major forms of N available at the base of the planktonic food web: dissolved organic N (DON) and dissolved inorganic N (DIN). In DON, N is associated with organic C, which may promote both heterotrophs and autotrophs. In environments where DIN nitrate is the prevailing N form and dissociated dissolved organic C (DOC) is available, heterotrophs may also be
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Diversity of taxon-specific traits of seasonally distinct unicellular eukaryotic assemblages in a eutrophic coastal area with marked plankton blooms Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-12-01 Savvas Genitsaris, Natassa Stefanidou, Ulrich Sommer, Maria Moustaka-Gouni
ABSTRACT: In this work, we focused on the functional characterization of unicellular eukaryotic assemblages that had previously been taxonomically characterized by 18S rRNA gene amplicon sequencing in a eutrophic coastal site with marked plankton blooms. Biological traits of different functional groups were assigned to the retrieved operational taxonomic units (OTUs). The traits included size, trophic
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Microalgal characterization during a mucilaginous bloom on deep gorgonian forests of Tavolara Punta Coda Cavallo MPA Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-12-01 Francesca Panizzuti, Sandra Citterio, Rodolfo Gentili, Augusto Navone, Pieraugusto Panzalis, Isabella Provera, Sarah Caronni
ABSTRACT: Harmful algal blooms (HABs) have increased in frequency, but despite an extreme increase in research on this topic, general knowledge on HABs is still scarce. Mucilaginous algal blooms, in particular, are ever more present and can heavily affect marine ecosystems. Gorgonians appear significantly affected, as their branches are easily entangled (pelagic aggregates) and overgrown (benthic aggregates)
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Evaluation of the mycobiome of ballast water and implications for fungal pathogen distribution Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-10-13 William A. Gerhard, Daniel B. Raudabaugh, J. Alejandro Rojas, Claudia K. Gunsch
ABSTRACT: Marine transport has the potential to alter the geographic range of microorganisms through ballast water movement. Recent culture-independent studies investigated the bacteriome of ballast water, but no prior studies have examined the mycobiome. Here were examined 60 ballast and harbor samples from 4 major ports and 5 ocean samples using culture-independent techniques to determine (1) the
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Impact of increasing temperature on the taxonomic and metabolic structure of bacterial communities in a global warming context Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-09-29 Karolina Grabowska-Grucza, Aleksandra Bukowska#, Waldemar Siuda, Ryszard J. Chróst, Bartosz Kiersztyn
ABSTRACT: Climate change is one of the most severe threats for ecosystems worldwide. Lakes can be studied as indicators of climate change. The prokaryotic compartment of lakes is affected by climate change, and the metabolic processes of prokaryotes could both attenuate or exacerbate the negative impacts of climate change on the ecosystem. However, in contrast to studies on the impact of global warming
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Nitrate availability modulates induced defenses in Phaeocystis globosa against protozoan grazers Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-09-15 Xiaodong Wang, Fan Yang, Yan Wang
ABSTRACT: Colony formation by Phaecoystis has been widely considered an induced defense mechanism against various grazers and contributes to the occurrence of algal blooms in nitrate-enriched waters. However, the effects of nitrate availability on these induced defenses against protozoan grazers remain unclear. Four P. globosa strains isolated from 4 off-coast areas of the South China Sea were exposed
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Microbial diversity in marine sediments of two hydrocarbon reservoir areas in the eastern Atlantic Ocean Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-07-28 Xueqin Wei, Lihua Liu, Xueping Chen, Guangrong Jin, Li Liu, Minggang Cai, Zhongyan Qiu
ABSTRACT: Microbes are the main drivers of the biogeochemical cycles of carbon and other elements in marine sediments. The distribution of microorganisms, particularly at the centimeter scale, demonstrates the critical role of the local biogeochemical environment. The Atlantic Ocean has enormous hydrocarbon reserves, yet microbial diversity in hydrocarbon reservoir areas, a unique habitat for microorganisms
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Substrate diversity affects carbon utilization rate and threshold concentration for uptake by natural bacterioplankton communities Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-06-09 Johanna Sjöstedt, Urban J. Wünsch, Colin A. Stedmon
ABSTRACT: Persistence of dissolved organic matter (DOM) in aquatic environments may in part be explained by high diversity and low concentrations of carbon substrates. However, changes in dissolved substrate quality can modify aquatic bacterial community composition and rate of carbon uptake. The aim of this study was to test if the presence of multiple simple substrates affects the turnover of organic
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Biogeography of reef water microbes from within-reef to global scales Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-03-31 Lei Ma, Cynthia Becker, Laura Weber, Chris Sullivan, Brian Zgliczynski, Stuart Sandin, Marilyn Brandt, Tyler B. Smith, Amy Apprill
ABSTRACT: Seawater microorganisms play an important role in coral reef ecosystem functioning and can be influenced by biological, chemical, and physical features of reefs. As coral reefs continue to respond to environmental changes, the reef seawater microbiome has been proposed as a conservation tool for monitoring perturbations. However, the spatial variability of reef seawater microbial communities
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Microbial communities (bacteria, archaea and eukaryotes) in a temperate estuary during seasonal hypoxia Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-02-24 Luciana F. Santoferrara, George B. McManus, Dianne I. Greenfield, Susan A. Smith
ABSTRACT: Eutrophication and hypoxia markedly alter trophic dynamics and nutrient cycling in estuarine water columns, but little is known about the microbial communities that drive and interact with these changes. Here we studied microbial plankton (bacteria, archaea, protists and micro-metazoans) in a large temperate estuary where bottom hypoxia occurs every summer due to warmer temperatures, stratification
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Impact of El Niño-Southern Oscillation on plankton ciliates from a saline lowland river in South America Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-01-10 Gabriela C. Küppers, M. Elisa Bazzuri, Nancy C. Neschuk, M. Cristina Claps
ABSTRACT: We analyzed the structure and dynamics of plankton ciliates from the Salado River, Buenos Aires (Argentina), during El Niño-Southern Oscillation events, to evaluate their response to alterations of certain environmental variables during these climatic phenomena. The basin exhibits intense land use at the headwaters and fluctuating salinity along the main channel, canals and tributaries. During
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Disturbed virus-bacteria dynamics in Otsuchi Bay (Japan) after the mega-earthquake and tsunami in March 2011 Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-01-10 Toshi Nagata, Yanhui Yang, Hideki Fukuda
ABSTRACT: On 11 March 2011, a mega-earthquake followed by a huge tsunami hit a large area of the Pacific coast of Tohoku, Japan, and caused widespread disturbances in marine ecosystems; however, the impacts on virus-bacteria systems have not yet been elucidated. To investigate whether virus-bacteria interactions were affected by the earthquake and tsunami, we analyzed time series data of viral and
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16S rRNA gene sequences of Candidatus Methylumidiphilus (Methylococcales), a putative methanotrophic genus in lakes and ponds Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-01-27 Antti J. Rissanen, Moritz Buck, Sari Peura
ABSTRACT: A putative novel methanotrophic genus, Candidatus Methylumidiphilus (Methylococcales), was recently shown to be ubiquitous and one of the most abundant methanotrophic genera in water columns of oxygen-stratified lakes and ponds in boreal and subarctic areas. However, it has probably escaped detection in many previous studies that used 16S rRNA gene amplicon sequencing due to insufficient
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Feeding ecology and microbiome of the pteropod Limacina helicina antarctica Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-01-27 Patricia S. Thibodeau, Bongkeun Song, Carly M. Moreno, Deborah K. Steinberg
ABSTRACT: The pteropod (pelagic snail) Limacina helicina antarctica is a dominant grazer along the Western Antarctic Peninsula (WAP) and plays an important role in regional food web dynamics and biogeochemical cycling. For the first time, we examined the gut microbiome and feeding ecology of L. h. antarctica based on 16S and 18S rRNA gene sequences of gut contents in the WAP during austral summer.
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Bacterioplankton composition as an indicator of environmental status: proof of principle using indicator value analysis of estuarine communities Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2022-01-13 Cecilia Alonso, Emiliano Pereira, Florencia Bertoglio, Miquel De Cáceres, Rudolf Amann
ABSTRACT: Increasing awareness of environmental impacts caused by anthropogenic activities highlights the need to determine indicators of environmental status that can be routinely assessed at large spatial and temporal scales. Microbial communities comprise the greatest share of biological diversity on Earth and can rapidly reflect recent environmental changes while providing a record of past events
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CORRIGENDUM: Shifts in phytoplankton community structure modify bacterial production, abundance and community composition Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-12-02 MT Camarena-Gómez,T Lipsewers,J Piiparinen,E Eronen-Rasimus,D Perez-Quemaliños,L Hoikkala,C Sobrino,K Spilling
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Environmental influences shaping microbial communities in a low oxygen, highly stratified marine embayment Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-10-21 RRP Da Silva,CA White,JP Bowman,E Raes,A Bisset,C Chapman,L Bodrossy,DJ Ross
Microbial communities in the marine environment drive biogeochemical and nutrient cycles. However, microbial composition and therefore their role in ecosystems is likely to be strongly influenced by the environment. Here, we examined Macquarie Harbour, a highly stratified system on the west coast of Tasmania, Australia, to determine environmental factors driving microbial diversity. Water was sampled
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Effects of nutrient enrichments on oligotrophic phytoplankton communities: a mesocosm experiment near Hawai‘i, USA Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-10-21 D Böttjer-Wilson,AE White,KM Björkman,MJ Church,S Poulos,E Shimabukuro,YM Rii,A Ludwig,K von Bröckel,U Riebesell,RM Letelier,DM Karl
A large-volume mesocosm-based nutrient perturbation experiment was conducted off the island of Hawai‘i, USA, to investigate the response of surface ocean phytoplankton communities to the addition of macronutrients, trace metals, and vitamins and to assess the feasibility of using mesocosms in the open ocean. Three free-drifting mesocosms (~60 m3) were deployed: one mesocosm served as a control (no
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Unraveling the distribution patterns of bacterioplankton in a mesoscale cyclonic eddy confined to an oxygen-depleted basin Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-10-07 Silvia Pajares
ABSTRACT: Mesoscale eddies in oxygen minimum zones profoundly affect the structure and productivity of marine planktonic communities and alter key biogeochemical cycles. The influence of a mesoscale cyclonic eddy on the spatial distribution of bacterioplankton was investigated in a semi-enclosed, oxygen-depleted basin in the Gulf of California, Mexico. Most of the bacterial taxa showed a strong vertical
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The microbiome of the seagrass Halophila ovalis: community structuring from plant parts to regional scales Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-10-07 Bertrand Chengxiang Yan, Golam Rabbani, Nicole Li Ying Lee, Jillian Lean Sim Ooi, Jen Nie Lee, Danwei Huang, Benjamin J. Wainwright
ABSTRACT: Seagrass meadows are critical marine ecosystems. They are significant carbon sinks and play numerous important roles in coastal areas. They help to prevent shoreline erosion and serve as nursery grounds for many marine species. Like their terrestrial counterparts, seagrasses form symbiotic relationships with diverse communities of bacteria that help to promote and maintain host fitness. In
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Human impact on symbioses between aquatic organisms and microbes Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-08-26 Willem Stock, Martijn Callens, Shira Houwenhuyse, Ruben Schols, Naina Goel, Manon Coone, Charlotte Theys, Vienna Delnat, Alice Boudry, Ester M. Eckert, Cecilia Laspoumaderes, Hans-Peter Grossart, Luc De Meester, Robby Stoks, Koen Sabbe, Ellen Decaestecker
ABSTRACT: Aquatic organisms rely on microbial symbionts for coping with various challenges they encounter during stress and for defending themselves against predators, pathogens and parasites. Microbial symbionts are also often indispensable for the host’s development or life cycle completion. Many aquatic ecosystems are currently under pressure due to diverse human activities that have a profound
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Extracellular enzyme activity of model coldadapted bacteria and Arctic sea-ice microbial communities under subzero hypersaline conditions Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-08-26 G. M. Showalter, J. W. Deming
ABSTRACT: Bacterially produced extracellular enzymes (EEs) play an important role in the cycling of organic matter in the marine environment, breaking down large compounds to those small enough to be transported across the cell membrane. EEs may play an especially important role within the brines of sea ice, as freezing concentrates both bacteria and organic materials into brine pockets, leading to
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The microbiology of isoprene cycling in aquatic ecosystems Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-07-15 R. A. Dawson, A. T. Crombie, P. Pichon, M. Steinke, T. J. McGenity, J. C. Murrell
ABSTRACT: Isoprene (2-methyl-1,3-butadiene) is emitted in vast quantities (>500 Tg C yr-1). Most isoprene is emitted by trees, but there is still incomplete understanding of the diversity of isoprene sources. The reactivity of isoprene in the atmosphere has potential implications for both global warming and global cooling, with human health implications also arising from isoprene-induced ozone formation
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Spatio-temporal variation of microphytobenthos biomass, diversity and assemblage structure in the Loire Estuary, France Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-07-01 Lourenço Ribeiro, Ismaïl Benyoucef, Michel Poulin, Bruno Jesus, Philippe Rosa, Vona Méléder, GuoYing Du, Laurent Barillé
ABSTRACT: Diatom-dominated microphytobenthos (MPB) communities of 4 intertidal mudflats along the meso- and polyhaline reaches of the Loire Estuary, France, were investigated during a year cycle. They were analysed in terms of biomass, diversity, species composition and growth form distribution. The assemblages of the 2 upstream sites were characterised by high biomass and lower diversities and were
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Differences in regulation of planktonic and epilithic biofilm bacterial production in the middle reaches of a temperate river Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-06-17 Kenji Tsuchiya, Ayato Kohzu, Victor S. Kuwahara, Shin-ichiro S. Matsuzaki, Masatoshi Denda, Kimio Hirabayashi
ABSTRACT: To clarify the governing factors of planktonic and epilithic bacterial production (BP) and to quantify their relative contributions to the carbon cycle, we investigated the seasonal variation and regulatory factors of planktonic and epilithic BP in the middle reaches of the Shinano River, Japan, ecosystem from February 2019 to May 2020. Sampling was conducted at 3 stations: upper stream riffle
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Seasonal and interannual variation in lower Columbia River phytoplankton (2005-2018): environmental variability and a decline in large bloom-forming diatoms Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-06-17 Vanessa Rose, Gretchen Rollwagen-Bollens, Stephen M. Bollens, Julie Zimmerman
ABSTRACT: Understanding the influence of biotic and abiotic factors on riverine phytoplankton dynamics is challenging, particularly as anthropogenic stressors such as eutrophication, invasive species, and climate change alter these relationships. We examined a 14 yr (January 2005 to December 2018) dataset of phytoplankton and water quality variables, along with zooplankton and nutrient concentrations
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Temporal variation in community structure of zoosporic fungi in Lake Biwa, Japan Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-06-17 Peixue Song, Rong Yi, Shoko Tanabe, Naoshige Goto, Kensuke Seto, Maiko Kagami, Syuhei Ban
ABSTRACT: Zoosporic fungi play an important role in aquatic environments, but their diversity, especially that of parasitic fungi of phytoplankton, has still not been fully revealed. We conducted monthly analyses of the community structure of zoosporic fungi at a pelagic site in Lake Biwa, Japan, from May to December 2016. Metabarcoding analysis, targeted to a large subunit region of ribosomal DNA
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Non-random patterns of chytrid infections on phytoplankton host cells: mathematical and chemical ecology approaches Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-06-03 Kinuyo Yoneya, Takeshi Miki, Silke Van den Wyngaert, Hans-Peter Grossart, Maiko Kagami
ABSTRACT: Host-parasite interactions between phytoplankton and fungi (chytrids) are key processes in aquatic ecosystems. However, individual-level heterogeneity in these interactions remains unexplored, although its importance in predicting the spread of diseases has been demonstrated in epidemiology. In this study, we experimentally tested whether individual-level heterogeneity could be a good indicator
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Fungal communities of submerged fine detritus from temperate peatland and stream habitats Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-05-27 Daniel B. Raudabaugh, Elizabeth M. Bach, Julie M. Allen, Andrew N. Miller
ABSTRACT: Fungi are essential in aquatic ecosystems, transforming organic matter into energy sources that support higher trophic levels. However, researchers do not yet know the extent of fungal diversity and species distribution within these important ecosystems. Therefore, we examined the detrital fungal communities from contrasting aquatic habitats (temperate peatlands and streams) to provide an
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Diversity of picoeukaryotes in the eastern equatorial Indian Ocean revealed by metabarcoding Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-05-27 Chao Yuan, Yan Li, Xuelei Zhang, Meiling Ge, Ming Xin, Lin Liu, Zongling Wang
ABSTRACT: We used 18S rRNA gene metabarcoding to investigate picoeukaryotic diversity and distribution at the surface and deep chlorophyll maximum (DCM) of 4 stations in the eastern equatorial Indian Ocean (EEIO). The results showed that picoeukaryotic communities were dominated by 5 phyla: Dinoflagellata, Radiolaria, Chlorophyta, Ochrophyta and Ciliophora. The picoeukaryotic communities were classified
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Swimming behavior of cryptophyte prey affects prey preference of the ambush-feeding ciliate Mesodinium rubrum Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-05-06 Houshuo Jiang, Matthew D. Johnson
ABSTRACT: The mixotrophic ciliate Mesodinium rubrum is an ambush feeder relying on cryptophyte prey motility for prey encounter and perception; therefore, cryptophyte species-specific swimming behaviors affect M. rubrum’s prey preference. Here, a high-speed microscale imaging system was used to quantify the swimming behaviors of 3 cryptophyte species (Teleaulax amphioxeia, Storeatula major, and Guillardia
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Bacterial community dynamics during a harmful algal bloom of Heterosigma akashiwo Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-05-06 Gwynneth Matcher, Daniel A. Lemley, Janine B. Adams
ABSTRACT: Phytoplankton bloom events result in distinct changes in the composition and availability of nutrients as well as physical conditions within aquatic ecosystems, resulting in significant effects on bacterial communities. Using a metabarcoding approach, this study investigated the effect of a harmful algal bloom (HAB) of Heterosigma akashiwo in the Sundays Estuary, South Africa, on bacterial
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Prokaryotic community composition and structure during Phaeocystis globosa blooms in the Beibu Gulf, China Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-05-06 Cheng He, Sha Xu, Zhenjun Kang, Shuqun Song, Caiwen Li
ABSTRACT: Phaeocystis globosa blooms have become one of the major ecological issues in the Beibu Gulf, China, in recent years, resulting in a series of negative impacts on local fisheries and industry. While prokaryotes play key roles in nutrient cycling and energy flow during algal blooms, information regarding the response of the prokaryotic community during Phaeocystis blooms remains scarce. Thus
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Microbial ecology of coral-dominated reefs in the Federated States of Micronesia Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-04-22 Amy Apprill, Henry Holm, Alyson E. Santoro, Cynthia Becker, Matthew Neave, Konrad Hughen, Angela Richards Donà, Greta Aeby, Thierry Work, Laura Weber, Sean McNally
ABSTRACT: Microorganisms are central to the functioning of coral reef ecosystems, but their dynamics are unstudied on most reefs. We examined the microbial ecology of shallow reefs within the Federated States of Micronesia. We surveyed 20 reefs surrounding 7 islands and atolls (Yap, Woleai, Olimarao, Kosrae, Kapingamarangi, Nukuoro, and Pohnpei), spanning 875053 km2. On the reefs, we found consistently
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Key drivers of microbial abundance, activity, and diversity in karst spring waters across an altitudinal gradient in Slovenia Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-04-22 Maja Opalički Slabe, Tjaa Danevčič, Katrin Hug, Lucas Fillinger, Ines Mandić-Mulec, Christian Griebler, Anton Brancelj
ABSTRACT: In aquatic ecosystems, the biomass, activity and composition of microorganisms are determined to a large extent by local and regional environmental conditions. While karst aquifers are an important source for drinking water, the ecology of microbial communities in karst waters has hardly been studied. This study examined the regional variations and seasonal dynamics of microbial communities
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Composition and temporal dynamics of sand-dwelling dinoflagellate communities from three Mediterranean beaches Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-04-08 Albert Reñé, Mona Hoppenrath, Guillaume Reboul, David Moreira, Purificación López-García
ABSTRACT: Compared to plankton, benthic communities are thought to be heterogeneous among sites and more stable through time; however, benthic protists in general, and sand-dwelling dinoflagellates in particular, have been scarcely studied, and their diversity remains mostly unknown. To test those claims, we studied the diversity, structure and temporal dynamics of benthic dinoflagellate communities
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Insights into the planktonic to sessile transition in a marine biofilm-forming Pseudoalteromonas isolate using comparative proteomic analysis Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-04-08 Zhiwen Wu, Yuyuan Wu, Yanqiu Huang, Jian He, Pei Su, Danqing Feng
ABSTRACT: Bacterial biofilms play an important role in marine biofouling. The formation of a biofilm starts when marine bacterial cells transition from a planktonic to an attached state. However, the molecular mechanisms involved in this transition are poorly understood. Here, 51 strains of marine bacteria were isolated from natural biofilms growing on submerged artificial surfaces (glass slides, epoxy
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Changes in microbial communities during seawater pre-treatment within a desalination plant Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-03-11 Sergio Balzano, Tamar Jamieson, Sophie Leterme
ABSTRACT: We analysed prokaryotic and eukaryotic communities across the seawater pre-treatment system of Penneshaw (Kangaroo Island, South Australia) desalination plant, using 16S and 18S rRNA gene sequencing. The richness of operational taxonomic units increased downstream of the pre-treatment system (reverse osmosis feedwater) compared to raw seawater for Archaea, while it decreased for bacteria
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The role of nutrients in promoting a bloom of the nuisance raphidophyte species Gonyostomum semen in a subtropical reservoir Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-03-11 Michele A. Burford, Stephen J. Faggotter, Baden Gibbes, Amanda D. Neilen, Michael Bartkow
ABSTRACT: The nuisance raphidophyte Gonyostomum semen (Ehrenberg) Diesing blooms in lakes and is known to produce a mucilage which can cause human skin irritation. Parameters such as water temperature, iron and high dissolved organic matter loads are shown to be important drivers in temperate regions. However, the causes of blooms in warmer latitudes are less well understood. Over a 6 mo study period
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A phosphate starvation response gene (psr1-like) is present and expressed in Micromonas pusilla and other marine algae Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-02-25 Cara L. Fiore, Harriet Alexander, Melissa C. Kido Soule, Elizabeth B. Kujawinski
ABSTRACT: Phosphorus (P) limits primary production in regions of the surface ocean, and many plankton species exhibit specific physiological responses to P deficiency. The metabolic response of Micromonas pusilla, an ecologically relevant marine photoautotroph, to P deficiency was investigated using metabolomics and comparative genomics. The concentrations of some intracellular metabolites were elevated
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Effects of seawater viscosity and temperature on the movement of the marine dinoflagellate Prorocentrum minimum Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-02-11 Abigail S. Tyrell, Houshuo Jiang, Nicholas S. Fisher
ABSTRACT: It is important to understand how planktonic dinoflagellate movements may be affected by environmental conditions, including those potentially influenced by climate change. Because of their small size, dinoflagellates can be expected to be highly sensitive to changes in viscosity; however, there is currently little understanding of how these organisms and other algae may be regulated by seawater
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Nitrogen cycling in coastal sediment microbial communities with seasonally variable benthic nutrient fluxes Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2021-01-28 Alexis J. Marshall, Andrew Longmore, Lori Phillips, Caixian Tang, Helen L. Hayden, Karla B. Heidelberg, Pauline Mele
ABSTRACT: Benthic microbial communities contribute to nitrogen (N) cycling in coastal ecosystems through taxon-specific processes such as anammox, nitrification and N-fixation and community attributed pathways such as denitrification. By measuring the total (DNA-based) and active (RNA-based) surface sediment microbial community composition and the abundance and activity profiles of key N-cycling genes
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Phosphate diester utilization by marine diazotrophs Trichodesmium erythraeum and Crocosphaera watsonii Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-12-17 Tamaha Yamaguchi, Mitsuhide Sato, Natsuki Gonda, Kazutaka Takahashi, Ken Furuya
ABSTRACT: In the phosphate-depleted oligotrophic ocean, microbes utilize various dissolved organic phosphorus (P) compounds as alternative P sources, using enzymes such as alkaline phosphatases. However, knowledge of such P acquisition mechanisms is limited, especially in association with the physiology of nitrogen-fixing organisms, which play a substantial role in marine biogeochemical cycling. We
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Natural chemical control of marine associated microbial communities by sessile Antarctic invertebrates Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-12-03 Carlos Angulo-Preckler, Eva García-Lopez, Blanca Figuerola, Conxita Avila, Cristina Cid
ABSTRACT: Organisms living in the sea are exposed to fouling by other organisms. Many benthic marine invertebrates, including sponges and bryozoans, contain natural products with antimicrobial properties, since microbes usually constitute the first stages of fouling. Extracts from 4 Antarctic sponges (Myxilla (Myxilla) mollis, Mycale tylotornota, Rossella nuda, and Anoxycalyx (Scolymastra) joubini)
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Assessment of viral assemblages in different types of wetland water in northeast China using RAPD-PCR Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-12-03 Yan Sun, Junjie Liu, Qin Yao, Jian Jin, Xiaobing Liu, Guanghua Wang
ABSTRACT: Viruses are the most abundant and ubiquitous biological entities in various ecosystems, yet few investigations of viral communities in wetlands have been performed. To address this data gap, water samples from 6 wetlands were randomly collected across northeast China; viruses in the water were concentrated by sequential tangential flow filtration, and viral communities were assessed through
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Diel oscillations in the feeding activity of heterotrophic and mixotrophic nanoplankton in the North Pacific Subtropical Gyre Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-12-03 PE Connell, F Ribalet, EV Armbrust, A White, DA Caron
Daily oscillations in photosynthetically active radiation strongly influence the timing of metabolic processes in picocyanobacteria, but it is less clear how the light−dark cycle affects the activities of their consumers. We investigated the relationship between marine picocyanobacteria and nanoplanktonic consumers throughout the diel cycle to determine whether heterotrophic and mixotrophic protists
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Growth and phosphatase activities of Ostreopsis cf. ovata biofilms supplied with diverse dissolved organic phosphorus (DOP) compounds Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-11-05 Neil Thomas William Ellwood, Marisa Margherita Pasella, Cecilia Totti, Stefano Accoroni
ABSTRACT: It is becoming increasingly evident that the use of organic nutrients is widespread among many aquatic phototrophic organisms. Simultaneously, incidents of eutrophication of coastal waters are becoming more common due to rises in organic nutrient loads deriving from anthropogenic activities and natural terrestrial processes. In the northern Adriatic Sea, blooms of the toxic dinoflagellate
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Uncovering cryptochrome/photolyase gene diversity in aquatic microbiomes exposed to diverse UV-B regimes Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-10-22 Daniel G. Alonso-Reyes, Maria Eugenia Farias, Virginia Helena Albarracín
ABSTRACT: During evolution, microorganisms exposed to high amounts of UV-B irradiation developed fine-tuned photo-enzymes called ‘photolyases’ to cope with DNA damage caused by UV-B. These photoreceptors, belonging to the cryptochrome/photolyase family (CPF), have been well characterized at the genomic and proteomic level in bacteria isolated from a wide range of environments. In this work, we go further
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Contribution of large bacteria to bacterial biomass in a deep freshwater lake (Lake Biwa, Japan) Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-10-22 Shang Shen, Yoshihisa Shimizu
ABSTRACT: Despite the importance of bacterial cell volume in microbial ecology in aquatic environments, literature regarding the effects of seasonal and spatial variations on bacterial cell volume remains scarce. We used transmission electron microscopy to examine seasonal and spatial variations in bacterial cell size for 18 mo in 2 layers (epilimnion 0.5 m and hypolimnion 60 m) of Lake Biwa, Japan
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Novel method for measuring aquatic bacterial productivity using D10-leucine based on protein synthesis rate Aquat. Microb. Ecol. (IF 1.4) Pub Date : 2020-10-22 Kenji Tsuchiya, Tomoharu Sano, Noriko Tomioka, Komatsu Kazuhiro, Akio Imai, Kazuhide Hayakawa, Takamaru Nagata, Takahiro Okamoto, Victor S. Kuwahara, Ayato Kohzu
ABSTRACT: The most widely used method for measuring bacterial production is tritium-labeled leucine (3H-Leu). Although this method provides methodological simplicity and high sensitivity, the employment of radioactive isotopes is often restricted by regulations, particularly in field settings. In this study, we developed a non-radioactive method for measuring bacterial productivity based on the protein