Aquatic Microbial Ecology最新文献_第9页

Increase in phytoplankton production and consumption in response to a typhoon passing through the southern East China Sea 台风经过中国东海南部后浮游植物产量和消耗量的增加

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-04-30 DOI: 10.3354/ame01932

A. Tsai, G. Gong, Kuo-Ping Chiang

{"title":"Increase in phytoplankton production and consumption in response to a typhoon passing through the southern East China Sea","authors":"A. Tsai, G. Gong, Kuo-Ping Chiang","doi":"10.3354/ame01932","DOIUrl":"https://doi.org/10.3354/ame01932","url":null,"abstract":"The northwestern Pacific Ocean and East China Sea (ECS) are frequently affected by typhoons during the summer period. To identify changes in production and consumption rates of phytoplankton (<20 and 20~200 µm) affected by Typhoon Maria (9-10 July 2018), 2 sampling periods were compared: a pre-typhoon cruise (4-9 July 2018) and a post-typhoon cruise (13-17 July 2018). Results showed that <20 and 20~200 µm phytoplankton production was 14- and 1.8-fold higher, respectively, in the post-typhoon period compared to the pre-typhoon. Accompanying this post-typhoon shift from pico- and nanophytoplankton to microphytoplankton, the consumption rate of microzooplankton on <20 µm phytoplankton was 11.6 mgC m-3 d-1 in the pre-typhoon period, and increased to 203.3 mgC m-3 d-1 after the typhoon. Furthermore, the ingestion fluxes were 4.9 and 8.0 mgC m-3 d-1 through mesozooplankton grazing on microzooplankton (ciliates and dinoflagellates) pre- and post-typhoon, respectively. Our findings show that organisms from the microbial food web (i.e. ciliates and dinoflagellates) may control the phytoplankton assemblage during the post-typhoon period of increased productivity, and thus represent an important trophic link between the classical and microbial food webs in the southern ECS.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"6 1","pages":"121-126"},"PeriodicalIF":1.4,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75087357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Multivariate control of heterotrophic bacterial abundance and zooplankton grazing in Labrador fjords (northeastern Canada) 加拿大拉布拉多峡湾异养细菌丰度与浮游动物放牧的多元控制

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-04-16 DOI: 10.3354/ame01929

AG Simo-Matchim, Michel Gosselin, C. Belzile

{"title":"Multivariate control of heterotrophic bacterial abundance and zooplankton grazing in Labrador fjords (northeastern Canada)","authors":"AG Simo-Matchim, Michel Gosselin, C. Belzile","doi":"10.3354/ame01929","DOIUrl":"https://doi.org/10.3354/ame01929","url":null,"abstract":"This study was conducted in 4 Labrador fjords (Nachvak, Saglek, Okak, and Anaktalak) during the summers of 2007 and 2013, early fall 2010, and late fall 2009. Our results show that water temperature combined with the availability of nutrients and organic substrates are the main abiotic factors controlling the abundance of heterotrophic bacteria in Labrador fjords. Bacterivory also played a crucial role, with heterotrophic bacteria exerting a significant bottom-up control on the abundance of heterotrophic nanoflagellates (r = 0.35, p < 0.05) and ciliates (r = 0.70, p < 0.01). During summer 2013, the intrinsic phytoplankton growth rate varied between <0 and 0.64 d-1, with a mean value of 0.36 d-1. The herbivory rate was highly variable, ranging from 0.01 to 0.86 d-1, with a mean value of 0.31 d-1. Grazing mortality was 6-fold higher than phytoplankton growth rate. Mean phytoplankton growth and herbivory rates in Labrador fjords were comparable to the Barents and Bering seas. The intrinsic growth rate of total heterotrophic bacteria ranged between <0 and 0.68 d-1, with a mean value of 0.30 d-1. Bacterivory varied from 0.01 to 0.95 d-1, with a mean of 0.30 d-1. Mortality due to grazing was up to 2.3 times higher than total bacterial growth rate. This study improves our understanding of the factors influencing the dynamics of heterotrophic bacteria and indicates that herbivory and bacterivory exert substantial control on microbial communities in Labrador fjords.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"10 1","pages":"105-120"},"PeriodicalIF":1.4,"publicationDate":"2020-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73337127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Biogeographic variations of picophytoplankton in three contrasting seas: the Bay of Bengal, South China Sea and Western Pacific Ocean 孟加拉湾、南海和西太平洋三个对比海域浮游植物的生物地理变异

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-04-09 DOI: 10.3354/ame01928

Yuqiu Wei, Danyue Huang, Guicheng Zhang, Yuying Zhao, Jun Sun

{"title":"Biogeographic variations of picophytoplankton in three contrasting seas: the Bay of Bengal, South China Sea and Western Pacific Ocean","authors":"Yuqiu Wei, Danyue Huang, Guicheng Zhang, Yuying Zhao, Jun Sun","doi":"10.3354/ame01928","DOIUrl":"https://doi.org/10.3354/ame01928","url":null,"abstract":"Marine picophytoplankton are abundant in many oligotrophic oceans, but the known geographical patterns of picophytoplankton are primarily based on small-scale cruises or timeseries observations. Here, we conducted a wider survey (5 cruises) in the Bay of Bengal (BOB), South China Sea (SCS) and Western Pacific Ocean (WPO) to better understand the biogeographic variations of picophytoplankton. Prochlorococcus (Pro) were the most abundant picophytoplankton (averaging [1.9−3.6] × 104 cells ml−1) across the 3 seas, while average abundances of Synechococcus (Syn) and picoeukaryotes (PEuks) were generally 1−2 orders of magnitude lower than Pro. Average abundances of total picophytoplankton were similar between the BOB and SCS (4.7 × 104 cells ml−1), but were close to 2-fold less abundant in the WPO (2.5 × 104 cells ml−1). Pro and Syn accounted for a substantial fraction of total picophytoplankton biomass (70−83%) in the 3 contrasting seas, indicating the ecological importance of Pro and Syn as primary producers. Pro were generally abundant in oligotrophic open waters; however, the exceptional presence of Pro near the SCS coast was potentially associated with the Kuroshio intrusion. Syn and PEuk abundances were higher near freshwater-dominated areas, which was likely due to dilution waters. Water temperature and cold eddies were also major drivers responsible for the biogeographic distributions of picophytoplankton. Although Pro, Syn and PEuks showed negative correlations with nutrient concentrations, their maximal abundances in vertical distribution showed positive correlations with the nutricline depth, indicating that nutrient availability plays a 2-faceted role in regulating the biogeographic variation in picophytoplankton.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"89 1","pages":"91-103"},"PeriodicalIF":1.4,"publicationDate":"2020-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80376788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Biochemical fingerprints of marine fungi: implications for trophic and biogeochemical studies 海洋真菌的生化指纹图谱:对营养和生物地球化学研究的意义

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-03-26 DOI: 10.3354/ame01927

M. Gutiérrez, J. Vera, B. Srain, R. Quiñones, L. Wörmer, K. Hinrichs, S. Pantoja-Gutiérrez

{"title":"Biochemical fingerprints of marine fungi: implications for trophic and biogeochemical studies","authors":"M. Gutiérrez, J. Vera, B. Srain, R. Quiñones, L. Wörmer, K. Hinrichs, S. Pantoja-Gutiérrez","doi":"10.3354/ame01927","DOIUrl":"https://doi.org/10.3354/ame01927","url":null,"abstract":"Fungi are ubiquitous in the marine en vironment, but their role in carbon and nitrogen cycling in the ocean, and in particular the quantitative significance of fungal biomass to ocean biogeochemistry, has not yet been assessed. Determination of the biochemical and stable isotope composition of marine fungi can provide a basis for identifying fungal patterns in relation to other microbes and detritus, and thus allow evaluation of their contribution to the transformation of marine organic matter. We characterized the biochemical composition of 13 fungal strains isolated from distinct marine environments in the eastern South Pacific Ocean off Chile. Proteins accounted for 3 to 21% of mycelial dry weight, with notably high levels of the essential amino acids histidine, threonine, valine, lysine and leucine, as well as polyunsaturated fatty acids, ergo sterol, and phosphatidylcholine. Elemental composition and energetic content of these marine-derived fungi were within the range reported for bacteria, phytoplankton, zooplankton and other metazoans from aquatic environments, but a distinct pattern of lipids and proteins was identified in marine planktonic fungi. These biochemical signatures, and an elemental composition indicative of a marine planktonic source, have potential applications for the assessment of fungal contribution to marine microbial biomass and organic matter reservoirs, and the cycling of carbon and nutrients.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"45 1","pages":"75-90"},"PeriodicalIF":1.4,"publicationDate":"2020-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86335581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

High light stress reduces dinoflagellate predation on phytoplankton through both direct and indirect responses 强光胁迫通过直接和间接的反应减少鞭毛藻对浮游植物的捕食

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-02-13 DOI: 10.3354/ame01924

S. Strom, Olivia Barberi, Clayton Mazur, Kelley J. Bright, K. Fredrickson

引用次数: 3

Bacteria known to induce settlement of larvae of Hydroides elegans are rare in natural inductive biofilm 已知能诱导秀丽隐杆线虫幼虫沉降的细菌在自然诱导生物膜中是罕见的

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-01-30 DOI: 10.3354/ame01925

N. Vijayan, M. Hadfield

引用次数: 5

Freshwater Actinobacteria from sediments of the deep and ancient Lake Baikal (Russia) and their genetic potential as producers of secondary metabolites 俄罗斯贝加尔湖深古沉积物中的淡水放线菌及其作为次生代谢物生产者的遗传潜力

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-01-16 DOI: 10.3354/ame01923

E. Protasov, D. Axenov-Gribanov, Z. Shatilina, M. Timofeyev, A. Lane

{"title":"Freshwater Actinobacteria from sediments of the deep and ancient Lake Baikal (Russia) and their genetic potential as producers of secondary metabolites","authors":"E. Protasov, D. Axenov-Gribanov, Z. Shatilina, M. Timofeyev, A. Lane","doi":"10.3354/ame01923","DOIUrl":"https://doi.org/10.3354/ame01923","url":null,"abstract":"Actinobacteria from terrestrial and marine environments produce a variety of natural products that mediate interand intraspecies interactions. In contrast, the potential of freshwater Actinobacteria for secondary metabolite production remains underexplored. Large lakes with a long evolutionary history might contain microflora subjected to unique environmental conditions that favor the evolution of unique metabolic capabilities. One such lake is Lake Baikal (Russia), the deepest lake on earth as well as one of the oldest. In this study, we investigated the genetically encoded secondary metabolic potential of 24 Actinobacteria strains isolated from Lake Baikal sediments. PCR-based screening for genes encoding type I and type II polyketide synthases (PKSs), nonribosomal peptide synthetases (NRPSs), and halogenases confirmed that all strains possessed at least 1 of these biosynthetic genes. Both PKSs and NRPSs were widely distributed, while halogenase-encoding genes were not detected. Phylogenetic comparison of type I PKS ketosynthase (KS) domain sequences between freshwater isolates and marine and terrestrial strains supported overlap between KSs from these 3 groups. Evaluation of antibiotic activity for chemical extracts from all isolates revealed that 75% produced metabolites inhibitory toward model bacteria and/or fungi. To our knowledge, this study is among the first evaluations of the genetically encoded secondary metabolic capabilities of freshwater sediment Actinobacteria. Our findings highlight the similarities and differences between freshwater and marine Actinobacteria secondary metabolism, suggesting the potential of freshwater Actinobacteria for the production of natural products that may play roles as mediators of interactions between organisms in freshwater habitats.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"22 1","pages":"1-14"},"PeriodicalIF":1.4,"publicationDate":"2020-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73450392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Winter river plumes shape community composition and activity of heterotrophic microorganisms on the Oregon Coast 冬季河流羽流形成俄勒冈海岸异养微生物的群落组成和活动

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-01-16 DOI: 10.3354/ame01922

Brandon Kieft, B. Crump, Angelicque E. White, M. Goñi, Ryan S. Mueller

{"title":"Winter river plumes shape community composition and activity of heterotrophic microorganisms on the Oregon Coast","authors":"Brandon Kieft, B. Crump, Angelicque E. White, M. Goñi, Ryan S. Mueller","doi":"10.3354/ame01922","DOIUrl":"https://doi.org/10.3354/ame01922","url":null,"abstract":"Rivers and estuaries along the central Oregon margin transport large amounts of fluvialand terrestrial-derived materials into the coastal ocean during the winter season, which can become trapped in a nearshore coastal current by local density gradients and wind forcing. The influence of these substantial and persistent allochthonous inputs on wintertime biological activity in the Oregon coastal region is not well understood. We compared prokaryotic communities inside and outside of 2 buoyant coastal river plumes off the central Oregon coast in order to understand the relationship between plume conditions and the distributions of prokaryotic populations that form the base of the wintertime coastal food web by transforming carbon and nitrogen compounds. Both free-living and particle-associated communities inside nearshore plume zones were significantly different from communities outside the plume influence. Particulate organic matter concentrations correlated with the distribution of several Bacteroidetes populations with established roles in complex organic matter degradation in coastal ecosystems. Plume conditions also correlated with marine Gammaproteobacteria that are known to degrade terrestrially derived material. Peak heterotrophic respiration rates across sampling stations occurred at a local plume particle maximum, suggesting that particulate resources transported to coastal ocean waters by river plumes may be used or transformed by co-localized heterotrophic microorganisms. Taken together, the associations between river plume resources and prokaryotic populations implicated in organic matter turnover suggest that microbes in Oregon coastal ecosystems use allochthonous resources that are transported into the coastal ocean during winter, and that these resources help shape the coastal food web during the winter season.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"24 1","pages":"15-29"},"PeriodicalIF":1.4,"publicationDate":"2020-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82205411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Nitrogen cycling in coastal sediment microbial communities with seasonally variable benthic nutrient fluxes 随季节变化底栖生物养分通量的海岸沉积物微生物群落氮循环

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-01-01 DOI: 10.3354/ame01954

A. Marshall, A. Longmore, L. Phillips, C. Tang, H. Hayden, K. Heidelberg, P. Mele

{"title":"Nitrogen cycling in coastal sediment microbial communities with seasonally variable benthic nutrient fluxes","authors":"A. Marshall, A. Longmore, L. Phillips, C. Tang, H. Hayden, K. Heidelberg, P. Mele","doi":"10.3354/ame01954","DOIUrl":"https://doi.org/10.3354/ame01954","url":null,"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 (RNAbased) surface sediment microbial community composition and the abundance and activity profiles of key N-cycling genes in a semi-enclosed embayment — Port Phillip Bay (PPB), Australia — we show that although the total relative abundance of N-cycling taxa is comparatively lower close to estuary inputs (Hobsons Bay [HB]), the capacity for this community to perform diverse N-cycling processes is comparatively higher than in sediments isolated from inputs (Central PPB [CPPB]). In HB, seasonal structuring of the sediment microbial community occurred between spring and summer, co-occurring with decreases in the activity profiles of anammox bacteria and organic carbon content. No changes were detected in the activity profiles of nitrifiers or the community-based pathway denitrification. Although no seasonal structuring of the sediment microbial community occurred in CPPB, the activity profiles of key N-cycling genes displayed comparatively higher within-site variability. These results show that despite N-cycling taxa representing a smaller fraction of the total community composition in estuary impacted sediments (HB) these microbial communities consistently engage in N-cycling processes and that seasonal instability in the composition of this community is not reflective of changes in its capacity to cycle N through coupled nitrification−denitrification but potentially via changes within the anammox community.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"58 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77878416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

The role of nutrients in promoting a bloom of the nuisance raphidophyte species Gonyostomum semen in a subtropical reservoir 营养物质在亚热带水库中促进有害raphidophyte物种Gonyostomum semen开花中的作用

IF 1.4 4区环境科学与生态学

Aquatic Microbial Ecology Pub Date : 2020-01-01 DOI: 10.3354/ame01953

Martha O. Burford, SJ Faggotter, B. Gibbes, AD Neilen, M. Bartkow

{"title":"The role of nutrients in promoting a bloom of the nuisance raphidophyte species Gonyostomum semen in a subtropical reservoir","authors":"Martha O. Burford, SJ Faggotter, B. Gibbes, AD Neilen, M. Bartkow","doi":"10.3354/ame01953","DOIUrl":"https://doi.org/10.3354/ame01953","url":null,"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, we used field monitoring and a nutrient addition experiment within a water reservoir to examine the role of nutrients in promoting G. semen growth. Early in the study, an inflow event delivered nutrients which increased dissolved inorganic nitrogen (DIN) concentrations 2-fold and filterable reactive phosphorus (FRP = phosphate) 4-fold. This event shifted the phytoplankton community from a mixed community to one dominated by G. semen. Two months after the inflow event, the effect of nutrients in promoting G. semen was confirmed with a nutrient addition experiment. Total biovolumes of this species across the study were strongly predicted by FRP and nitrate + nitrite concentrations. G. semen biovolumes also decreased as ratios of total nitrogen (TN):total phosphorus (TP) and DIN:FRP increased, highlighting the importance of P inputs. The stable isotope tracer 15N-nitrate was also used to trace N through the G. semen-dominated phytoplankton community. The tracer rapidly cycled through the G. semen-dominated phytoplankton community in 1-2 d, settled and remineralized, providing an ongoing source of DIN for maintaining blooms. Overall, the results highlight the importance of FRP, and to a lesser extent nitrate, in promoting blooms of this nuisance species.","PeriodicalId":8112,"journal":{"name":"Aquatic Microbial Ecology","volume":"27 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85939287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2