Limnology and Oceanography最新文献_第9页

Eddy dipole differentially influences particle-associated and water column protistan community composition 涡旋偶极子对颗粒相关原生生物群落组成和水柱原生生物群落组成有不同的影响

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-29 DOI: 10.1002/lno.12785

Jennifer L. Beatty, Brittany P. Stewart, Lisa Y. Mesrop, Edward F. DeLong, David M. Karl, David A. Caron

{"title":"Eddy dipole differentially influences particle-associated and water column protistan community composition","authors":"Jennifer L. Beatty, Brittany P. Stewart, Lisa Y. Mesrop, Edward F. DeLong, David M. Karl, David A. Caron","doi":"10.1002/lno.12785","DOIUrl":"10.1002/lno.12785","url":null,"abstract":"Ocean eddies are mesoscale features that can extend > 100 km and maintain cohesiveness for months, impacting planktonic community structure and water column biogeochemical cycles. Standing stocks of protists in the water column and on sinking particles were investigated using microscopy, in situ imagery, and metabarcoding across an anticyclonic to cyclonic eddy dipole in the North Pacific Subtropical Gyre during July 2017. The water column was sampled from the surface to 500 m and particle interceptor traps were deployed at 150 m. Protistan assemblage composition varied substantially between sample type and analytical approach across the eddy dipole. Alveolates represented 63% of sequences from water samples. In contrast to water samples, rhizarian protists represented 79% of trap sequences obtained by metabarcoding of sediment trap material. Microscopy of trap material supported the important contribution of Rhizaria to sinking particles and revealed increased relative abundances of ciliates in the anticyclonic eddy and diatoms in the cyclonic eddy. In situ imagery confirmed the presence of relatively large Rhizaria that were not adequately assessed from water samples but contributed significantly to particle flux. Together, these data demonstrate differing perspectives of planktonic protistan community composition and contributions to sinking particles gained from the application of different sampling and analytic approaches. Our observations and analyses indicate a specific subset of the protistan community contributed disproportionately to organic matter downward export.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 4","pages":"817-832"},"PeriodicalIF":3.8,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12785","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056407","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

Wave-driven plant reconfiguration modifies light availability in seagrass meadows 波浪驱动的植物重构改变了海草草甸的光可用性

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-28 DOI: 10.1002/lno.12800

Tracy L. Mandel, Longhuan Zhu

{"title":"Wave-driven plant reconfiguration modifies light availability in seagrass meadows","authors":"Tracy L. Mandel, Longhuan Zhu","doi":"10.1002/lno.12800","DOIUrl":"10.1002/lno.12800","url":null,"abstract":"Seagrasses are considered foundation species in marine and estuarine ecosystems by contributing biomass, providing habitat, and damping waves and currents. Globally, seagrass health and primary productivity are threatened by factors that affect light availability, such as shading by algae and epiphytes, self-shading, and increased water column turbidity. This study focuses on how plant motion and reconfiguration lead to shading of an individual plant by itself and its neighbors, and how wave conditions, plant material properties, and shoot density affect light availability along a seagrass blade. We use a simple ray-optics shading model with the plant motion model of Zhu et al. (2020; Journal of Geophysical Research: Oceans 125:e2019JC015517) for a flexible blade under wavy flow to understand how phase-resolved plant behavior affects light availability as a function of vertical location in the water column. Results show that that shading of a plant by its neighbors occurs more under wave crests and troughs, and that factors that increase blade tip excursion (large wave height or wave period, or high plant flexibility) reduce light exposure. We develop a simplified theory and parameterization for average light exposure as a function of flow and plant conditions (as captured by the Cauchy number, buoyancy parameter, and ratio of stem spacing to blade length). These results help delineate optimal conditions for maximizing light exposure to seagrass' photosynthetic tissue in restoration projects, and facilitate the inclusion of flow-vegetation interactions in biological models of seagrass production.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"749-763"},"PeriodicalIF":3.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12800","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143054919","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

Ontogenetic shifts by juvenile fishes highlight the need for habitat heterogeneity and connectivity in river restoration 幼鱼的个体发生变化强调了河流恢复过程中栖息地异质性和连通性的必要性

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-28 DOI: 10.1002/lno.12797

Twan Stoffers, Anthonie D. Buijse, Jan Jaap Poos, Johan A. J. Verreth, Leopold A. J. Nagelkerke

{"title":"Ontogenetic shifts by juvenile fishes highlight the need for habitat heterogeneity and connectivity in river restoration","authors":"Twan Stoffers, Anthonie D. Buijse, Jan Jaap Poos, Johan A. J. Verreth, Leopold A. J. Nagelkerke","doi":"10.1002/lno.12797","DOIUrl":"10.1002/lno.12797","url":null,"abstract":"Large-scale anthropogenic river modifications have caused the loss of critical floodplain nursery habitats for riverine fish, leading to population declines. Restoration efforts have been implemented to recover these habitats, but with varying success. Understanding how larval and juvenile fish use habitats in dynamic river environments is essential for improving restoration strategies. We assessed ontogenetic shifts in habitat use by young-of-the-year fishes in the lower Rhine, analyzing 2167 samples across 18 restored floodplains over three growing seasons (2018–2020). Five distinct nursery habitats were identified: (1) exposed, fast-flowing habitats with coarse substrate; (2) turbid, nonflowing areas with high turbidity and chlorophyll; (3) shallow, vegetated habitats with macrophytes and shoreline vegetation; (4) deeper, sheltered habitats with structural complexity; and (5) shallow, slow-flowing areas. Habitat use shifted significantly with ontogeny across species. Larvae generally preferred shallow habitats (< 50-cm depth), either in slow-flowing areas (e.g., asp, ide, monkey goby, nase, and whitefin gudgeon) or vegetated zones with macrophytes (e.g., bleak, bitterling, bream, round goby, and zander). Juveniles increasingly used deeper habitats (> 50-cm depth), favoring fast-flowing areas (e.g., asp, barbel, ide), or deeper, nonflowing habitats (e.g., bream, zander). Our findings thus highlight the critical importance of habitat heterogeneity and connectivity for riverine fish biodiversity. Restoration strategies should prioritize the creation of a mosaic of shallow, low-velocity habitats for larvae, alongside deeper, fast-flowing, or sheltered areas for juveniles. Additionally, the movement of rheophilic species from floodplain habitats to the main river channel emphasizes the need for maintaining continuous connectivity between floodplains and the river.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"732-748"},"PeriodicalIF":3.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12797","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143054920","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

Epiphyton phenology determines the persistence of submerged macrophytes: Exemplified in temperate shallow lakes 附生植物物候决定了水下大型植物的持久性：以温带浅湖为例

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-28 DOI: 10.1002/lno.12808

Alena S. Gsell, Sven Teurlincx, Marta M. Alirangues Nuñez, Sabine Hilt

{"title":"Epiphyton phenology determines the persistence of submerged macrophytes: Exemplified in temperate shallow lakes","authors":"Alena S. Gsell, Sven Teurlincx, Marta M. Alirangues Nuñez, Sabine Hilt","doi":"10.1002/lno.12808","DOIUrl":"10.1002/lno.12808","url":null,"abstract":"Submerged macrophytes are key components in many freshwater and marine ecosystems, contributing to ecosystem functions and services. In temperate shallow lakes, spring epiphyton shading can be decisive for submerged macrophyte development, potentially leading to macrophyte collapse and a shift to undesired, turbid conditions. Global change can alter epiphyton phenology; however, the consequences for submerged macrophytes and their stabilizing effects on clear-water conditions remain to be elucidated. Based on field data, we propose a general epiphyton shading phenology for submerged macrophytes in temperate shallow lake ecosystems. We express the temporal dynamics of epiphyton shading in terms of onset and relative increase (slope) of epiphyton development as well as epiphyton grazing impacts (onset, duration) using a Boltzmann function. This function is added to the ecosystem model PCLake+ as a customizable, macrophyte-specific shading factor. We then assess how changes in the epiphyton phenology and the presence of grazing on epiphyton affects submerged macrophyte biomass in a generic temperate shallow model lake under control and warm winter scenarios. The results from the model provide a proof-of-concept that epiphyton shading can provoke macrophyte loss and shifts between alternative equilibria. Threshold values for critical shifts depend on epiphyton shading phenology. Earlier onset and longer duration of grazing can maintain macrophytes in nutrient or climate conditions under which they would otherwise collapse. Our results show the pivotal importance of epiphyton phenology in determining lake ecosystem-wide responses stressing the need for better incorporation of epiphyton into both models and monitoring.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"764-774"},"PeriodicalIF":3.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12808","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143054918","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

Hypoxia threatens coral and sea anemone early life stages 缺氧威胁着珊瑚和海葵的早期生命阶段

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-21 DOI: 10.1002/lno.12798

Benjamin H. Glass, Katie L. Barott

{"title":"Hypoxia threatens coral and sea anemone early life stages","authors":"Benjamin H. Glass, Katie L. Barott","doi":"10.1002/lno.12798","DOIUrl":"10.1002/lno.12798","url":null,"abstract":"Seawater hypoxia is increasing globally and can drive declines in organismal performance across a wide range of marine taxa. However, the effects of hypoxia on early life stages (e.g., larvae and juveniles) are largely unknown, and it is unclear how evolutionary and life histories may influence these outcomes. Here, we addressed this question by comparing hypoxia responses across early life stages of three cnidarian species representing a range of life histories: the reef-building coral Galaxea fascicularis, a broadcast spawner with horizontal transmission of endosymbiotic algae (family Symbiodiniaceae); the reef-building coral Porites astreoides, a brooder with vertical endosymbiont transmission; and the estuarine sea anemone Nematostella vectensis, a non-symbiotic broadcast spawner. Transient exposure of larvae to hypoxia (dissolved oxygen < 2 mg L−1 for 6 h) led to decreased larval swimming and growth for all three species, which resulted in impaired settlement for the corals. Coral-specific responses also included larval swelling, depressed respiration rates, and decreases in symbiont densities and function. These results indicate both immediate and latent negative effects of hypoxia on cnidarian physiology and coral–algal mutualisms specifically. In addition, G. fascicularis and P. astreoides were sensitized to heat stress following hypoxia exposure, suggesting that the combinatorial nature of climate stressors will lead to declining performance for corals. However, sensitization to heat stress was not observed in N. vectensis exposed to hypoxia, suggesting that this species may be more resilient to combined stressors. Overall, these results emphasize the importance of reducing anthropogenic carbon emissions to limit further ocean deoxygenation and warming.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"684-699"},"PeriodicalIF":3.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12798","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992333","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

How ecological regimes and emergent macrophytes determine sediment microbial communities: A new insight into typical eutrophic shallow lakes 生态制度和新兴大型植物如何决定沉积物微生物群落：对典型富营养化浅湖的新见解

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-21 DOI: 10.1002/lno.12799

Rujia He, Dayong Zhao, Qi Zhou, Qinglong L. Wu, Jin Zeng

{"title":"How ecological regimes and emergent macrophytes determine sediment microbial communities: A new insight into typical eutrophic shallow lakes","authors":"Rujia He, Dayong Zhao, Qi Zhou, Qinglong L. Wu, Jin Zeng","doi":"10.1002/lno.12799","DOIUrl":"10.1002/lno.12799","url":null,"abstract":"Understanding the response of microbial communities to different ecological regimes in eutrophic lakes and the underlying assembly mechanisms is of great significance for revealing the biodiversity maintenance mechanisms of lake ecosystems under alternative stable states. However, our current understanding of the response of sediment microbial communities under emergent macrophytes to regime shifts remains limited. Here, we demonstrated, for the first time, the asynchronous variations of littoral sediment bacterial and fungal communities, regarding the microbial diversities, assembly mechanisms, and inter-kingdom interactions across three lake regional regimes: macrophyte-dominated, transitional, and phytoplankton-dominated. We found the alpha diversities of the bacterial and fungal communities showed opposite trends, as the transitional regime had the highest bacterial but lowest fungal diversities. Stochastic processes, dominated by dispersal limitation, determined fungal community assembly, whereas deterministic processes, especially variable selection, shaped the bacterial community. The highest number of species–environment interactions and proportion of intra-kingdom interactions were observed in the co-occurrence network of the transitional regime; however, this network had the lowest proportion of inter-kingdom (bacteria–fungi) interactions among the three lake regional regimes. Furthermore, the macrophyte-dominated regime was observed to have the most complex network structure and maintain the highest microbial community stability. The rhizosphere of Phragmites australis enhanced the inter-kingdom interactions of bacterial and fungal communities. These findings provide a preliminary ecological perspective for understanding the hysteresis of regimes in response to environmental stress at the microbial community level and emphasize the importance of distinguishing ecologically distinct microbial taxa in future studies focused on alternative stable states.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"700-717"},"PeriodicalIF":3.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992337","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

Benthic bacterial communities are shaped by browning in boreal headwater streams 底栖细菌群落是由北方水源溪流的褐变形成的

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-21 DOI: 10.1002/lno.12801

Joanna Brüsecke, Timo Muotka, Kaisa-Leena Huttunen, Kaisa Lehosmaa, Jussi Jyväsjärvi

{"title":"Benthic bacterial communities are shaped by browning in boreal headwater streams","authors":"Joanna Brüsecke, Timo Muotka, Kaisa-Leena Huttunen, Kaisa Lehosmaa, Jussi Jyväsjärvi","doi":"10.1002/lno.12801","DOIUrl":"10.1002/lno.12801","url":null,"abstract":"Owing to the rapid progress of high-throughput sequencing technologies, microbial assemblages have gained growing interest in environmental impact assessment. However, research on microbial community responses, particularly those of benthic biofilm, to browning (increased concentrations of dissolved organic carbon [DOC]), is scarce. We used data from 55 boreal streams to examine if biofilm bacterial communities exhibit changes in diversity and community composition along a gradient of browning (3.6–27 mg DOC L−1). Species richness increased slightly with increasing DOC, whereas community composition changed markedly across the gradient, especially in the active community. Pseudomonadota and Bacteroidota were overall dominant bacterial phyla. In the active community, Bacteroidota became relatively less abundant and Pseudomonadota more abundant with increasing DOC. Nitrate-N (NO3-N) and DOC were the most important predictors of bacterial community turnover. The greatest change in community composition occurred between 75 and 100 μg NO3-N L−1. For DOC, the first change point was at the low-end of the gradient, followed by a major change in strongly brownified waters (> 20 mg L−1). Bacterial communities became phylogenetically more similar than expected by chance as DOC increased. Concordance between bacterial and benthic invertebrate communities was very high, indicating that browning exerts a strong control over both taxonomic groups. Our results suggest that microbial communities, particularly the active portion of the community, may provide a sensitive and reliable tool for stream bioassessment. We defined a threshold-type response in bacterial assemblages to water browning but more research is needed on microbial responses to multiple simultaneous stressors related to global warming and land-use intensification.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 3","pages":"718-731"},"PeriodicalIF":3.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992334","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

Issue Information & TOC 发行信息和目录

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-20 DOI: 10.1002/lno.12806

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Issue Information & Copyright 发行信息和版权

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-20 DOI: 10.1002/lno.12805

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Issue Information & Masthead 发行信息和报头

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2025-01-20 DOI: 10.1002/lno.12804

引用次数: 0