Limnology and Oceanography最新文献_第2页

Issue Information & Masthead 期刊信息和刊头

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-22 DOI: 10.1002/lno.12726

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 : 2024-10-22 DOI: 10.1002/lno.12728

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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 : 2024-10-22 DOI: 10.1002/lno.12727

引用次数: 0

Issue Information & Members 发行信息和成员

IF 3.8 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-22 DOI: 10.1002/lno.12729

引用次数: 0

Grazer‐induced toxin production is energetically costly and significantly reduces growth of cylindrospermopsin‐producing cyanobacteria 啃食者诱导的毒素生产需要付出高能量成本，并会显著降低产生圆柱孢藻毒素的蓝藻的生长速度

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-19 DOI: 10.1002/lno.12721

Lamei Lei, Wei Liu, Zihan Chen, Liang Peng, Li‐Juan Xiao, Bo‐Ping Han, Brett A. Neilan

{"title":"Grazer‐induced toxin production is energetically costly and significantly reduces growth of cylindrospermopsin‐producing cyanobacteria","authors":"Lamei Lei, Wei Liu, Zihan Chen, Liang Peng, Li‐Juan Xiao, Bo‐Ping Han, Brett A. Neilan","doi":"10.1002/lno.12721","DOIUrl":"https://doi.org/10.1002/lno.12721","url":null,"abstract":"Toxins have been proposed as a defense mechanism for phytoplankton against zooplankton grazing. However, the associated costs are not understood. Here, we aim to reveal the costs in terms of both physiological and molecular responses in the cylindrospermopsin (CYN)‐producing cyanobacterium Raphidiopsis raciborskii. Exposure of R. raciborskii to Daphnia magna resulted in a significant increase in its CYN cell quota which was grazer cell density‐dependent, indicating an inducible effect on CYN production. A negative and significant relationship between cellular growth rate and CYN production suggested a growth‐defense trade‐off, highlighting the costly nature of toxin production. Despite strong transcriptional responses (121 differentially expressed genes) in R. raciborskii under grazing pressure, the CYN gene cluster remained largely unaffected, implying post‐transcriptional regulation of CYN biosynthesis. Significant variation was observed in transcripts for phosphorus metabolism and photosynthesis‐related genes, and evidenced that energy (ATP) metabolic processes were stimulated. This study is the first to demonstrate the high energy requirements for CYN production and provide insight into the molecular basis underlying the costs of toxin production.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142449650","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

What controls the onset of winter stratification in a deep, dimictic lake? 是什么控制了深水二叠纪湖泊冬季分层的开始？

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-14 DOI: 10.1002/lno.12704

Jay Austin

{"title":"What controls the onset of winter stratification in a deep, dimictic lake?","authors":"Jay Austin","doi":"10.1002/lno.12704","DOIUrl":"https://doi.org/10.1002/lno.12704","url":null,"abstract":"The transition from summer stratification to winter stratification is considered for deep, dimictic Lake Superior. The fall transition is dynamically distinct from the better‐studied spring transition; it is characterized by a wind‐driven collapse of weakening summer stratification, a surface‐cooling–driven period during which the water column is essentially isothermal, and eventual onset of inverse (cold upper layer) stratification, after which sub‐thermocline water temperatures are largely fixed for the rest of the season. Due to the small value of thermal expansivity near the temperature of maximum density, temperature gradients do not impart much stability to the water column, and it is difficult for winter stratification to form immediately upon dropping below the temperature of maximum density. Instead, the water column continues to cool until the thermal expansivity is sufficiently large in magnitude to allow temperature gradients to impart stability. This observation implies that the temperature locked into the deep water for the winter season will be a consequence of the specific meteorological forcing experienced in a given year; there may be long‐term climate change driven trends in the timing of the onset of stratification but not trends in winter deep‐water temperature. To address this hypothesis, 15 yr of moored temperature data collected in Lake Superior are examined, and a scaling argument and climatological data are applied to better understand interannual variability in the onset of winter stratification.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142431464","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

Size distribution of aggregates across different aquatic systems around Japan shows that stronger aggregates are formed under turbulence 日本各地不同水系的聚集体大小分布表明，湍流会形成更强的聚集体

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-12 DOI: 10.1002/lno.12686

Marika Takeuchi, Sarah L. C. Giering, Hidekatsu Yamazaki

{"title":"Size distribution of aggregates across different aquatic systems around Japan shows that stronger aggregates are formed under turbulence","authors":"Marika Takeuchi, Sarah L. C. Giering, Hidekatsu Yamazaki","doi":"10.1002/lno.12686","DOIUrl":"https://doi.org/10.1002/lno.12686","url":null,"abstract":"Marine aggregates, composed of various particles, play a crucial role in ocean carbon storage. The overall size distribution of the aggregates (number size spectra) is controlled by the balance between aggregation and disaggregation processes. Turbulence has been proposed to facilitate both aggregation and disaggregation by increasing the collision rate of aggregates or sometimes directly tearing them apart. Predominant processes driven by turbulence typically depend on the level of turbulence—relatively weak turbulence is associated with aggregation while stronger turbulence promotes disaggregation. Aggregate strength also plays a key role, as strongly bonded aggregates can withstand turbulence better, leading to lower disaggregation rates. While the relationship between turbulence and aggregate strength has been studied numerically and experimentally, field measurements remain limited. Here, we compare our number size spectra to turbulence intensity from the field measurements across different environmental settings around Japan to determine the effect of turbulence on aggregate strength. We combined measurements from 10 sites with different environmental settings and observed the flatter slopes (higher net aggregation rate) and shifts in the intersection lengths with an increase of turbulence, while strong turbulence is typically linked with disaggregation. Our findings suggested that stronger aggregates are formed under stronger turbulence and the overall population of strong aggregates also increases with an increase of turbulence intensity. We also compared our number size spectra with three other confounding factors (fluorescence, salinity, and aggregate compositions) to confirm the effects of turbulence are dominant in our aggregate dynamics.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142430418","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

Nutrient enrichment—but not warming—increases nitrous oxide emissions from shallow lake mesocosms 养分富集--而非变暖--增加了浅湖中观模型的氧化亚氮排放量

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-12 DOI: 10.1002/lno.12709

Joachim Audet, Eti E. Levi, Erik Jeppesen, Thomas A. Davidson

{"title":"Nutrient enrichment—but not warming—increases nitrous oxide emissions from shallow lake mesocosms","authors":"Joachim Audet, Eti E. Levi, Erik Jeppesen, Thomas A. Davidson","doi":"10.1002/lno.12709","DOIUrl":"https://doi.org/10.1002/lno.12709","url":null,"abstract":"Shallow lakes and ponds play a crucial role in the processing of carbon and other nutrients. However, many lakes and ponds worldwide are affected by climate change and nutrient pollution. How these pressures affect the emission of the greenhouse gas nitrous oxide (N2O) is unclear. Warming and eutrophication are expected to increase the production and emission of N2O in lakes and ponds, but changes in ecological structure and function may complicate these seemingly straightforward relationships. In this study, we used the world's longest running, mesocosm‐based, freshwater climate change experiment to disentangle the effect of nutrient enrichment and warming on N2O emissions. We gathered a large dataset on N2O concentrations and ancillary variables, comprising three sampling campaigns between 2011 and 2020 and a total of 687 individual mesocosm measurements. Our results demonstrated that nutrient enrichment increased N2O emissions, while warming (+2.5–4.0°C and +3.75–6.0°C) had no discernable effect. Our study indicates that curtailing nitrogen influxes into lakes and ponds is the most effective strategy to minimize N2O emissions, and while warming may influence N2O emissions, it does not appear to be a direct driver. These findings underscore the importance of prioritizing nitrogen mitigation efforts to curb N2O emissions from shallow lakes and ponds.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142430422","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

DNA metabarcoding reveals distinct bacterial and phytoplankton assemblages in the Agulhas Current and the adjacent coastal shelf DNA 代谢编码揭示了阿古哈斯洋流和邻近沿岸陆架中不同的细菌和浮游植物群落

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-10 DOI: 10.1002/lno.12703

Ross‐Lynne A. Gibb, Danielle K. L. Botha, Siddarthan Venkatachalam, Mfundo Bizani, Thomas G. Bornman, Rosemary A. Dorrington

{"title":"DNA metabarcoding reveals distinct bacterial and phytoplankton assemblages in the Agulhas Current and the adjacent coastal shelf","authors":"Ross‐Lynne A. Gibb, Danielle K. L. Botha, Siddarthan Venkatachalam, Mfundo Bizani, Thomas G. Bornman, Rosemary A. Dorrington","doi":"10.1002/lno.12703","DOIUrl":"https://doi.org/10.1002/lno.12703","url":null,"abstract":"The Agulhas Current is a globally important western boundary current that influences numerous processes (e.g., upwelling, biogeochemical fluxes and distribution of marine taxa) in the southwestern Indian Ocean. The oceanographic processes of the Agulhas Current are well understood, but precisely how they influence coastal ecosystem productivity remains to be elucidated. In the present foundational study, we characterized the bacterial (16S rRNA gene) and phytoplankton (chloroplast 16S rRNA, rbcL, and eukaryotic 18S rRNA genes) community structures of the Agulhas Current system using a metabarcoding approach. All four markers provided consistent data on the bacterial and phytoplankton communities in the Agulhas Current and coastal sites. The study revealed distinct, conserved communities and similar patterns of dominance by taxa adapted to oligotrophic conditions within the Agulhas Current, sampled 2 yr apart. By contrast, there was significant variability in taxonomic diversity and abundance of phytoplankton communities in the adjacent coastal waters that could be linked to localized upwelling. While the Agulhas Current bacterial and phytoplankton communities were diverse and represented many functional groups, the coastal sites were more diatom‐dominated and included genera typically associated with upwelling, for example, Thalassiosira spp. Based on their relative abundance profiles, phytoplankton communities were more responsive to environmental variability than bacteria and may therefore prove more useful in linking ecosystem dynamics to environmental variability in marine systems.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142405313","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

Adaptation of a keystone aquatic crustacean to cold temperatures on the Qinghai–Tibetan Plateau 青藏高原关键性水生甲壳动物对低温的适应性

IF 4.5 1区地球科学

Limnology and Oceanography Pub Date : 2024-10-10 DOI: 10.1002/lno.12693

Xiuping Zhang, Lugege Wang, Zhixiong Deng, David Blair, Wei Hu, Mingbo Yin

{"title":"Adaptation of a keystone aquatic crustacean to cold temperatures on the Qinghai–Tibetan Plateau","authors":"Xiuping Zhang, Lugege Wang, Zhixiong Deng, David Blair, Wei Hu, Mingbo Yin","doi":"10.1002/lno.12693","DOIUrl":"https://doi.org/10.1002/lno.12693","url":null,"abstract":"Understanding the genomic architecture of temperature adaptation is critical for characterizing and predicting the effects of temperature changes on natural populations. However, our understanding of these mechanisms is still limited, especially concerning adaptation to a cold climate. Here, we looked for adaptive phenotypic features that may help high‐elevation waterflea (Daphnia sinensis) clones to cope with the low temperatures of the Qinghai–Tibetan Plateau (QTP) and explored possible genomic signatures of adaptation to cold. We used an experimental approach to compare transcriptional responses, in high‐elevation and lowland D. sinensis ecotypes from China to different experimental temperatures (16°C vs. 20°C). We ran life table experiments and found that high‐elevation clones (from the QTP) produced more offspring in their 1st clutch (or over the 1st two clutches) than lowland clones when grown at a lower temperature. This temperature‐dependent life history difference was associated with strong genomic signatures of temperature adaptation: the gene SLC4A11 (encoding a transmembrane protein transporting Na+ and H+), together with its encompassing genomic island, might contribute to the adaptive evolution to the cold temperature experienced by high‐elevation clones. We noted that a set of candidate genes specific to the high‐elevation clones was associated with lipid metabolism, cuticle production, and cellular proliferation, possibly involved in the mechanism of temperature adaptation of these clones to the climate on the QTP. Our findings advance the understanding of how organisms have evolved to cope with cold environments.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":null,"pages":null},"PeriodicalIF":4.5,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142405514","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