Limnology and Oceanography最新文献_第10页

Diel vertical migration and seamount stepping stones promote species connectivity from coastal to offshore insular systems in the Tropical Southwestern Atlantic 昼夜垂直迁移和海山阶石促进了热带西南大西洋沿海到近海岛屿系统的物种连通性

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-29 DOI: 10.1002/lno.12648

Everton Giachini Tosetto, Christophe Lett, Sigrid Neumann-Leitão, Ariane Koch-Larrouy, Nicolas Barrier, Alex Costa da Silva, Julie Salvetat, Arnaud Bertrand

{"title":"Diel vertical migration and seamount stepping stones promote species connectivity from coastal to offshore insular systems in the Tropical Southwestern Atlantic","authors":"Everton Giachini Tosetto, Christophe Lett, Sigrid Neumann-Leitão, Ariane Koch-Larrouy, Nicolas Barrier, Alex Costa da Silva, Julie Salvetat, Arnaud Bertrand","doi":"10.1002/lno.12648","DOIUrl":"10.1002/lno.12648","url":null,"abstract":"The recruitment of marine species in isolated oceanic island systems can be challenged by prevailing currents, as exemplified by the Tropical Southwestern Atlantic. In this region, the Fernando de Noronha ridge hosts several seamounts, the Rocas Atoll and the Fernando de Noronha Archipelago, which are home to great marine biodiversity. However, along the ridge, the central branch of the South Equatorial Current (cSEC), flowing westward, poses a challenge to the recruitment of organisms toward Fernando de Noronha. To unveil critical insights into the intricate processes shaping biodiversity in these insular ecosystems, we use a dispersal Lagrangian tool to explore the role of diel vertical migration (DVM) to depth strata influenced by the South Equatorial Undercurrent (SEUC), which flows eastward bellow the cSEC, in shaping species dispersal and metacommunity dynamics. Our results show that while not a direct journey, the DVM into SEUC-influenced strata increases the possibility that the seamounts and the Rocas Atoll act as stepping stones between the continental shelf and Fernando de Noronha. Propagules of organisms originating primarily from the continental shelf are transported to the western seamounts of the ridge. Upon reaching the western seamounts, organisms can find suitable habitats to recruit. The progeny of these communities that migrate to SEUC-influenced strata have the opportunity to reach suitable habitats at the Rocas Atoll and the Eastern seamounts, ultimately connecting to the Fernando de Noronha archipelago. These results provide scientific fundaments for the development of a functional network of marine protected areas in the Tropical Southwestern Atlantic.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 9","pages":"2071-2084"},"PeriodicalIF":3.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12648","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141857757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of aggregate-colonizing copepods on the biological carbon pump in a high-latitude fjord 聚合定殖桡足类对高纬度峡湾生物碳泵的影响

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-29 DOI: 10.1002/lno.12641

Camilla Svensen, Morten Iversen, Fredrika Norrbin, Klas Ove Möller, Ingrid Wiedmann, Jofrid Skarðhamar, Coralie Barth-Jensen, Slawomir Kwasniewski, Mateusz Ormanczyk, Anna Maria Dąbrowska, Marja Koski

{"title":"Impact of aggregate-colonizing copepods on the biological carbon pump in a high-latitude fjord","authors":"Camilla Svensen, Morten Iversen, Fredrika Norrbin, Klas Ove Möller, Ingrid Wiedmann, Jofrid Skarðhamar, Coralie Barth-Jensen, Slawomir Kwasniewski, Mateusz Ormanczyk, Anna Maria Dąbrowska, Marja Koski","doi":"10.1002/lno.12641","DOIUrl":"10.1002/lno.12641","url":null,"abstract":"Zooplankton consumption of sinking aggregates affects the quality and quantity of organic carbon exported to the deep ocean. Increasing laboratory evidence shows that small particle-associated copepods impact the flux attenuation by feeding on sinking particles, but this has not been quantified in situ. We investigated the impact of an abundant particle-colonizing copepod, Microsetella norvegica, on the attenuation of the vertical carbon flux in a sub-Arctic fjord. This study combines field measurements of vertical carbon flux, abundance, and size-distribution of marine snow and degradation rates of fecal pellets and algal aggregates. Female M. norvegica altered their feeding behavior when exposed to aggregates, and ingestion rates were 0.20 μg C ind.−1 d−1 on marine snow and 0.11 μg C ind.−1 d−1 on intact krill fecal pellets, corresponding to 48% and 26% of the females' body carbon mass. Due to high sea surface abundance of up to ~ 50 ind. L−1, the population of M. norvegica had the potential to account for almost all the carbon removal in the upper 50 m of the water column, depending on the type of the aggregate. Our observations highlight the potential importance of abundant small-sized copepods for biogeochemical cycles through their impact on export flux and its attenuation in the twilight zone.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 9","pages":"2029-2042"},"PeriodicalIF":3.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12641","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141857754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Searching for drivers of the patchy distribution of sympatric deposit-feeding sea cucumbers: A multi-scale monitoring study 寻找同域沉积取食海参斑块分布的驱动因素：多尺度监测研究

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-29 DOI: 10.1002/lno.12649

Joséphine Pierrat, Léa Urbistondoy, Alexandre Modi, Betsy Viramoutou, Patrick Frouin

{"title":"Searching for drivers of the patchy distribution of sympatric deposit-feeding sea cucumbers: A multi-scale monitoring study","authors":"Joséphine Pierrat, Léa Urbistondoy, Alexandre Modi, Betsy Viramoutou, Patrick Frouin","doi":"10.1002/lno.12649","DOIUrl":"10.1002/lno.12649","url":null,"abstract":"Three sea cucumber species, Holothuria atra, Holothuria leucospilota, and Stichopus chloronotus, are patchily distributed within the coral reefs of Reunion Island, exhibiting locally high densities (> 1 ind m−2). Previous studies stated that these sympatric species have thrived for almost four decades; however, factors involved in their distribution and spatiotemporal dynamics are not well understood yet. The aims of this study are to analyze the fine-scale spatiotemporal dynamics of these sympatric species and identify the key sedimentary factors (substrate composition and cover) involved in their distribution. Sea cucumber populations and sedimentary factors were monitored along back-reef and shore-to-ocean gradients during four consecutive seasons. Meanwhile, feeding behavior was assessed by measuring motility and excretion rates. Each species presents its own dynamic between the beginning and the end of the monitoring: increase of density for H. leucospilota, stability for H. atra, and decrease for S. chloronotus. Distribution of H. atra was closely related to substrate organic features (high organic matter, chlorophyll a, and ∂13C), H. leucospilota with the occurrence of seagrass and S. chloronotus with none. Results on feeding behavior showed that S. chloronotus emerges as a specialist while the two others appear to be generalists. Conspecific attraction or recruitment pattern may drive the high-density patchy distribution of both Holothuria species, while the drastic decrease of S. chloronotus could be linked to unstudied factors related to predation or climate change. Water flow regime could also have a significant effect on the patchy distribution of these species, therefore, further studies should pay particular attention to this factor.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 9","pages":"2057-2070"},"PeriodicalIF":3.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141857755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of a dense inflow on the stratification of a steep-sided lake 密集流入水流对陡坡湖分层的影响

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-29 DOI: 10.1002/lno.12610

Roger Pieters, Gregory A. Lawrence, Albert Leung, John Crusius, Thomas Pedersen

{"title":"Effect of a dense inflow on the stratification of a steep-sided lake","authors":"Roger Pieters, Gregory A. Lawrence, Albert Leung, John Crusius, Thomas Pedersen","doi":"10.1002/lno.12610","DOIUrl":"10.1002/lno.12610","url":null,"abstract":"We detail the effect of a small stream of dense inflow that significantly altered the stratification and water quality in a constructed water body in northern British Columbia, Canada. As the dense inflow passed through the epilimnion of the steep-sided lake, it entrained relatively large quantities of water. The resulting mixture of dense inflow and entrained epilimnetic water sank to the bottom of the lake. The removal of water from the epilimnion due to entrainment reduced the epilimnetic thickness. This opposes the normal process of epilimnetic deepening due to wind and convective cooling. The flux of fluid entrained into the dense inflow was calculated to be between 4 and 14 times the inflow, depending primarily on the thickness of the epilimnion. The entrainment had four major effects: (1) it reduced the residence time of the epilimnion from half a year to less than a month; (2) it removed the freshwater cap that resulted from spring ice melt; (3) it enabled fall turnover, which further enhanced deep oxygen content and helped to prevent meromixis from developing in the lake; and (4) it produced a rapid decline in contaminant (i.e., zinc) concentrations in the epilimnion, which received dissolved metals inputs from oxidized sulfide minerals exposed in the subaerial walls of the lake. Given the wide variety of inflows to inland water bodies, some of which are at least seasonally dense, an understanding of the mechanisms detailed here can inform lake management in general, and more specifically, management of water quality in mine-impacted water bodies.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 9","pages":"1905-1917"},"PeriodicalIF":3.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12610","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141857758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Winter entrainment drives the mixed layer supply of manganese in the Southern Ocean 冬季夹带驱动南大洋混合层的锰供应

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-26 DOI: 10.1002/lno.12634

Thapelo Ramalepe, Saumik Samanta, Ryan Cloete, Thomas J. Ryan-Keogh, Alakendra N. Roychoudhury

{"title":"Winter entrainment drives the mixed layer supply of manganese in the Southern Ocean","authors":"Thapelo Ramalepe, Saumik Samanta, Ryan Cloete, Thomas J. Ryan-Keogh, Alakendra N. Roychoudhury","doi":"10.1002/lno.12634","DOIUrl":"10.1002/lno.12634","url":null,"abstract":"Despite the subnanomolar dissolved manganese concentrations that can co-limit Southern Ocean primary production, their physical supply mechanisms during winter, for biological consumption in spring and summer have not yet been explored. During austral winter and spring 2019, two cruises were conducted in the Atlantic sector of the Southern Ocean, to determine the distribution and surface water supply mechanisms of dissolved manganese in the upper water column. The supply mechanisms were used to calculate the total flux of dissolved manganese to productive surface waters and were compared to biological consumption estimates. Mean dissolved manganese concentrations in the upper water column (< 500 m) during winter and spring were comparably low (≤ 0.34 nmol kg−1; p > 0.05), with seasonal mixed layer reservoir sizes averaging 65.21 ± 12.93 and 21.64 ± 19.32 μmol m−2, respectively. Winter entrainment contributed 89.33–99.99% (average 97.26% ± 5.28%) of the total dissolved manganese flux, while diapycnal diffusion contributed 0.52–10.58% (average 4.92% ± 5.14%), was identified as the dominant mechanisms for transporting dissolved manganese into the mixed layer in the subantarctic zone, polar frontal zone, and antarctic zone. Here, the winter physical supply rates were higher than the estimated consumption rates during spring, meeting phytoplankton biological demands. Whereas in the subtropical zone, the supply rates were lower than the consumption rates, indicating the presence of additional supply mechanisms such as coastal upwelling, which may help to meet the biological demands in this region.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 9","pages":"1929-1940"},"PeriodicalIF":3.8,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12634","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141769080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fine-grained sediment production by endolithic sponges on Caribbean coral reefs 加勒比珊瑚礁上内生海绵产生的细粒沉积物

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-24 DOI: 10.1002/lno.12640

Didier M. de Bakker, Chris T. Perry, Eden Magaña-Gallegos, Esmeralda Pérez-Cervantes, Lorenzo Alvarez-Filip

{"title":"Fine-grained sediment production by endolithic sponges on Caribbean coral reefs","authors":"Didier M. de Bakker, Chris T. Perry, Eden Magaña-Gallegos, Esmeralda Pérez-Cervantes, Lorenzo Alvarez-Filip","doi":"10.1002/lno.12640","DOIUrl":"10.1002/lno.12640","url":null,"abstract":"Endolithic sponges are key players in carbonate cycling on coral reef systems. While their bioerosion of reef framework is relatively well studied, their role in biogenic sediment generation is poorly understood. In this study, the sedimentary attributes and production rates of eight Caribbean endolithic sponge species were characterized. The findings revealed notable species-specific variations in sediment production rates (range: 1.0–6.3 kg CaCO3 m−2 yr−1), alongside consistency in sediment characteristics (modal sizes ranging from 39 to 48 μm). The species-specific rates were used to explore reef-scale variations in sponge-derived sediment generation across 50 reef sites in the Mexican Caribbean. Significant between-site variability was observed, with estimated annual sediment production ranging from < 0.01 to 0.84 kg m−2 of reef. Production was primarily driven by sponge abundance, with discernible spatial variations in the contributions of different species, which could be related to variability in local environmental conditions. The rapidity at which these sediment producers can utilize dead coral substrates, coupled with their positive response to the changing marine environment, highlights the growing importance of these sponges in modern degraded Caribbean reef systems.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 9","pages":"2015-2028"},"PeriodicalIF":3.8,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12640","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141764255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Resolving abrupt frontal gradients in zooplankton community composition and marine snow fields with an autonomous Zooglider 利用自主式 Zooglider 解决浮游动物群落组成和海洋雪场的突变锋面梯度问题

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-24 DOI: 10.1002/lno.12642

Sven Gastauer, Mark D. Ohman

{"title":"Resolving abrupt frontal gradients in zooplankton community composition and marine snow fields with an autonomous Zooglider","authors":"Sven Gastauer, Mark D. Ohman","doi":"10.1002/lno.12642","DOIUrl":"https://doi.org/10.1002/lno.12642","url":null,"abstract":"An autonomous Zooglider navigated across the California Current Front into low salinity, minty waters characteristic of the California Current proper in both summers of 2019 and 2021. Diving to 400 m depth, Zooglider transited another near‐surface frontal gradient somewhat inshore. These frontal gradients were generally associated with changes in intensity, size composition, and Diel Vertical Migration responses of acoustic backscatterers. They were also associated with pronounced changes in zooplankton community composition, as assessed by a shadowgraph imaging Zoocam. Zoocam detected a decline in concentrations of copepods, appendicularians, and marine snow in the offshore direction, and an overall shift in community structure to a higher proportion of carnivorous taxa (and, in 2019, of planktonic rhizaria). No taxon was consistently elevated at all the peak frontal gradients, but appendicularians, copepods, and rhizarians sometimes showed front‐related increases in concentration. Such frontal gradient regions represent relatively abrupt transitions to different communities of planktonic organisms and suspended marine snow particles, with consequences for predator–prey relationships and the dominant vectors of particle export into subsurface waters.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"7 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141755264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hidden seafloor hypoxia in coastal waters 沿海水域隐藏的海底缺氧现象

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-23 DOI: 10.1002/lno.12607

Jonas Patrik Fredriksson, Karl Attard, Christian Stranne, Inga Monika Koszalka, Ronnie N. Glud, Thorbjørn Joest Andersen, Christoph Humborg, Volker Brüchert

{"title":"Hidden seafloor hypoxia in coastal waters","authors":"Jonas Patrik Fredriksson, Karl Attard, Christian Stranne, Inga Monika Koszalka, Ronnie N. Glud, Thorbjørn Joest Andersen, Christoph Humborg, Volker Brüchert","doi":"10.1002/lno.12607","DOIUrl":"https://doi.org/10.1002/lno.12607","url":null,"abstract":"The expansion of transient and permanent coastal benthic anoxia is one of the most severe problems for the coastal ocean globally. We report frequent, hidden hypoxia in the bottom 5 cm of the water column of a coastal site in the central Baltic Sea by continuous high‐resolution profiling of oxygen (O2) directly above the sediment surface. This hypoxia stood in stark contrast to 30‐yr O2 monitoring records at this site that suggest apparent continuous well‐oxygenated conditions. In situ measurements showed highly dynamic conditions in the bottom 30 cm recording frequent gradual and abrupt changes between normoxic (> 63 μmol L−1) and hypoxic (< 63 μmol L−1) conditions that would remain undetectable by conventional bottom water O2 monitoring. The temporal variability of these “hidden” hypoxia is tied to the dynamic current field and to changes in O2 consumption following resuspension events. Our observations suggest that transient benthic hypoxia is much more common than routine monitoring data indicate.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"31 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141755265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Colony-forming and single-cell picocyanobacteria nitrogen acquisition strategies and carbon fixation in the brackish Baltic Sea 波罗的海咸水中菌落形成和单细胞微囊藻的氮获取策略和碳固定作用

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-22 DOI: 10.1002/lno.12636

Christien P. Laber, Javier Alegria Zufia, Catherine Legrand, Elin Lindehoff, Hanna Farnelid

{"title":"Colony-forming and single-cell picocyanobacteria nitrogen acquisition strategies and carbon fixation in the brackish Baltic Sea","authors":"Christien P. Laber, Javier Alegria Zufia, Catherine Legrand, Elin Lindehoff, Hanna Farnelid","doi":"10.1002/lno.12636","DOIUrl":"10.1002/lno.12636","url":null,"abstract":"Picocyanobacteria are widespread and globally significant primary producers. In brackish waters, picocyanobacterial populations are composed of diverse species with both single-cell and colony-forming lifestyles. Compared to their marine counterparts, brackish picocyanobacteria are less well characterized and the focus of research has been weighted toward single-cell picocyanobacteria. Here, we investigate the uptake dynamics of single and colony-forming picocyanobacteria using incubations with dual carbon-13 and inorganic (ammonium and nitrate) or organic (urea and amino acids) nitrogen-15 sources during August and September 2020 in the central Baltic Sea. Phytoplankton community and group-specific uptake rates were obtained using an elemental analyzer isotope ratio mass spectrometer (EA-IRMS) and nano secondary-ion mass spectrometry (NanoSIMS). Picocyanobacteria contributed greater than one third of the ammonium, urea, amino acids, and inorganic carbon community uptake/fixation in September but < 10% in August when phytoplankton biomass was higher. Overall, single-cell ammonium and urea uptake rates were significantly higher for single-celled compared to colonial picocyanobacteria. In a 6-yr offshore central Baltic Sea time series (2015–2020), summer abundances of colonial picocyanobacteria reached up to 105 cells mL−1 and represented > 5% of the average phytoplankton biomass, suggesting that they are periodically important for the ecosystem. Colonial strain identification was not distinguishable using 16S rRNA gene amplicon data, highlighting a need for refined tools for identification of colonial forms. This study shows the significance of single-celled brackish picocyanobacteria to nutrient cycling and the importance of considering uptake and lifestyle strategies when assessing the role of picocyanobacteria in aquatic ecosystems.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 9","pages":"1955-1969"},"PeriodicalIF":3.8,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12636","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141755267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Migrating ripples create streambed heterogeneity altering microbial diversity and metabolic activity 移动涟漪造成河床异质性，改变微生物多样性和代谢活动

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-07-21 DOI: 10.1002/lno.12631

Anna Oprei, José Schreckinger, Norbert Kamjunke, Anja Worrich, Michael Mutz, Ute Risse-Buhl

{"title":"Migrating ripples create streambed heterogeneity altering microbial diversity and metabolic activity","authors":"Anna Oprei, José Schreckinger, Norbert Kamjunke, Anja Worrich, Michael Mutz, Ute Risse-Buhl","doi":"10.1002/lno.12631","DOIUrl":"10.1002/lno.12631","url":null,"abstract":"Sandy sediments of lowland streams are typically transported at low flow in the form of migrating ripples. In these bedforms, microbial communities spanning all trophic guilds (heterotrophic bacteria, fungi, photoautotrophic and phagotrophic protists) are exposed to highly frequent moving–resting cycles of sediment grains. Up to date, it is unknown to what extent ripple migration impacts community metabolism and composition as well as the vertical zonation of sediment-associated multitrophic microbial communities compared to stationary sediments. We hypothesize that, as a result of mechanical abrasion and limited light supply, migrating ripple sediments have lower microbial abundance, diversity, metabolism and resource acquisition and no vertical zonation compared to stationary sediments. We collected samples from five lowland streams in north-eastern Germany between May and June 2020. The coarser and better sorted sediments of migrating ripples had a higher oxygen concentration and less organic matter than stationary sediments. Photosynthetic pigments, potential extracellular enzyme activities, bacterial cell counts, and fungal gene copies were lower in migrating ripples than in stationary sediments. In contrast, cell-specific bacterial production was higher in migrating ripples. Metabarcoding revealed that bedform migration was important in shaping the community structure of bacteria, fungi, and phagotrophic protists. Dry mass-related net community production, respiration, and bacterial production were higher in superficial compared to underlying layers irrespective of sediment transport. By modulating the abundance, diversity, and structure of different trophic guilds of microbial communities and their resource acquisition, migrating bedforms create streambed heterogeneity, shaping regional biodiversity and the flow of matter through the benthic food web.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 8","pages":"1882-1899"},"PeriodicalIF":3.8,"publicationDate":"2024-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12631","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141755268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0