Limnology and Oceanography最新文献

{"title":"Photoperiods and light differentially influence growth and potential niches of phycocyanin- and phycoerythrin-rich picocyanobacteria","authors":"Sylwia Śliwińska-Wilczewska,&nbsp;Marta Konik,&nbsp;Mireille Savoie,&nbsp;Anabella Aguilera,&nbsp;Naaman M. Omar,&nbsp;Douglas A. Campbell","doi":"10.1002/lno.12750","DOIUrl":"10.1002/lno.12750","url":null,"abstract":"<p>Strains from the picocyanobacteria genus <i>Synechococcus</i> are currently found across a wide range of photoperiods and photosynthetically active radiation. Future scenarios now forecast range expansions of marine <i>Synechococcus</i> into new photic regimes. We found that strains of temperate, coastal phycocyanin-rich and phycoerythrin-rich <i>Synechococcus</i> grew fastest under moderate photosynthetically active radiation, and a 24-h photoperiod, despite a cumulative diel photon dose equivalent to conditions where growth was slower, under higher light and shorter photoperiods. Under optimal conditions, a phycoerythrin-rich <i>Synechococcus</i> strain achieved a highest recorded cyanobacterial chlorophyll-specific exponential growth rate (<i>μ</i>) of 4.5 d⁻¹. Two phycoerythrin-rich strains demonstrated wider ability to modulate light capture capacity, whereas two phycocyanin-rich strains showed less change in light capture across increasing cumulative diel photon dose. All four coastal strains showed a decrease of effective absorption cross-section for photosystem II photochemistry, vs. increasing cumulative diel photosynthetically active radiation doses. Within each strain, <i>μ</i> showed consistent, saturating responses to increasing cumulative diel photosystem II electron flux, with more variations in responses of <i>μ</i> to cumulative photosynthetically usable radiation. As photoperiod opportunists, coastal picocyanobacteria show potential to expand into longer photic regimes as higher latitudes warm.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":"146-161"},"PeriodicalIF":3.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12750","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763503","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}

{"title":"Consistent cell-specific carbon fixation rates by small eukaryotic phytoplankton in contrasting nutrient-limited conditions","authors":"Denise Rui Ying Ong,&nbsp;Andrés Gutiérrez-Rodríguez,&nbsp;Karl A. Safi,&nbsp;Dominique Marie,&nbsp;Karen E. Selph,&nbsp;Michael R. Stukel,&nbsp;Moira Décima,&nbsp;Adriana Lopes dos Santos","doi":"10.1002/lno.12751","DOIUrl":"10.1002/lno.12751","url":null,"abstract":"<p>Small phytoplankton, consisting of pico and nano size fractions, are diverse in size and taxonomy. Yet, the differences in their productivity and taxonomic diversity are poorly described. Here, we measured the cell-specific carbon fixation rates of picocyanobacteria <i>Synechococcus</i>, picoeukaryote, and nanoeukaryote populations, while unveiling their taxonomic composition in oligotrophic subtropical and high-nutrient low-chlorophyll subantarctic waters. We coupled 24 h in situ radiolabeled ¹⁴C incubations to flow cytometry sorting and DNA metabarcoding from the same incubated samples, offering a direct account of the community associated with the carbon fixation rates measured. In both water masses, nanoeukaryotes had the highest cell-specific carbon fixation rate, followed by picoeukaryotes and <i>Synechococcus</i> (2.24 ± 29.99, 2.18 ± 2.08, and 0.78 ± 0.55 fgC cell⁻¹ h⁻¹, respectively). The cell-specific carbon fixation rates and growth rates of <i>Synechococcus</i> were threefold higher in subtropical compared to subantarctic waters, while the rates of picoeukaryotes and nanoeukaryotes had no significant difference between the biogeochemically-contrasting water masses. Sorted picoeukaryote populations were dominated by Mamiellophyceae, Pelagophyceae, Prymnesiophyceae, and Chrysophyceae, while nanoeukaryote populations were dominated by Dinophyceae and Prymnesiophyceae. Despite significant differences in their taxonomic composition, the sorted picoeukaryote populations in subantarctic waters and nanoeukaryote populations in subtropical and subantarctic waters were dominated by taxa reported in the literature as able to engage in phago-mixotrophic strategies (Prymnesiophyceae, Chrysophyceae, and Dinophyceae), suggesting that such trophic strategy might be applied by discrete small photosynthetic eukaryote populations to alleviate macronutrient and iron stress.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":"162-177"},"PeriodicalIF":3.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12751","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763597","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}

{"title":"Low-frequency noise affects development and movement patterns of a calanoid copepod","authors":"Nelly Tremblay,&nbsp;Gabriel A. Juma,&nbsp;Emily M. Herstoff,&nbsp;Cédric L. Meunier,&nbsp;Maarten Boersma","doi":"10.1002/lno.12743","DOIUrl":"10.1002/lno.12743","url":null,"abstract":"<p>Anthropogenic stressors are omnipresent in marine environments and interfere with organisms of all sizes, from large whales to small organisms. We investigated potential interactive multistressor effects of increased temperature with chronic low-frequency sound on the development and movement patterns of the calanoid copepod <i>Acartia tonsa</i>, a model species for small marine zooplankton. Copepods were reared while exposed to chronic low-frequency sound around 15 and 22 dB re 1 <i>μ</i>Pa² Hz⁻¹ above control sound pressure levels at frequencies between 110 and 120 Hz, at 21°C (increased temperature) and 18°C (control temperature). For each sound and temperature scenario, we assessed after-incubation development rate, stage distribution, and movement patterns. We found that fewer copepods reached the developmental stages copepodites IV to VI in low-frequency sound conditions, even though warmer conditions increased developmental rate. By using high-speed videography in both control and low-frequency sound conditions, we observed that copepods showed more escape behaviors (drops) and fewer feeding-associated behaviors (helical swimming) when exposed to low-frequency sound (~ 42 dB higher than normal at 142 Hz). Copepods reared with added low-frequency sound showed fewer feeding-associated behaviors and did not reverse these trends despite the absence of added sound in their feeding environment. These significant behavioral changes suggest detrimental negative, life-long, consequences for copepods exposed to low-frequency sound.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":"100-112"},"PeriodicalIF":3.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12743","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763504","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}

{"title":"Differences in factors determining taxon-based and trait-based community structures: a field test using zooplankton","authors":"Hiromichi Suzuki,&nbsp;Hidetaka Ichiyanagi,&nbsp;Jamie M. Kass,&nbsp;Jotaro Urabe","doi":"10.1002/lno.12744","DOIUrl":"10.1002/lno.12744","url":null,"abstract":"<p>Ecological community structure, which has traditionally been described in terms of taxonomic units, is driven by dispersal and environmental filters. Traits have recently been recognized as alternative units for quantifying community parameters, but they may have important differences with taxonomic units. For example, as taxon-based community structure is determined by the local species pool, it may be more dispersal-limited, whereas trait-based community structure may be more regulated by environmental conditions because traits are less tied to specific habitat locations. This implies that the relative importance of these two filters may vary depending on the units describing community structure, but no study has yet quantified how the contributions of these filters can differ. In this study, we examined zooplankton assemblages in 87 artificial reservoirs throughout the Japanese archipelago to quantify the relative importance of two filters by examining the effects of spatial configuration (reflecting dispersal filters) and biotic and abiotic variables (reflecting environmental filters) for taxon- and trait-based community structure. Variation in the taxon-based community structure was explained equally well by the spatial and the environmental variables, while variation in the trait-based community structure was explained more by environmental variables. These results support the idea that environmental filters play a more central role in determining trait-based community structures, and show that the relative importance of spatial and environmental filters changes with the way we define community structure.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":"113-127"},"PeriodicalIF":3.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12744","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763599","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}

{"title":"Spatiotemporal controls on organic matter sourcing to minerogenic salt marshes","authors":"Erin K. Peck,&nbsp;Miguel Goñi,&nbsp;Robert A. Wheatcroft","doi":"10.1002/lno.12739","DOIUrl":"10.1002/lno.12739","url":null,"abstract":"<p>Salt marshes are important carbon sinks; however, identification of the drivers of carbon burial rates is challenging because estuaries sit at terrestrial and marine interfaces. Here, we address the questions: what are the sources of organic matter sequestered in minerogenic salt marshes, and how do sources change through time? We characterized down-core sediment biogeochemistry (C : N, δ¹³C, δ¹⁵N) for the last century in seven Oregon USA high marshes and used a mixing model to elucidate differences in organic matter sources across estuaries and through time. Autochthonous biomass production consistently accounted for only half of overall organic matter accumulation, and the remainder was allochthonous, originating from a combination of estuarine and terrestrial sources. Salt marshes with high sediment loads buried more terrestrial organic matter, whereas those with low loads and substantial subtidal habitat buried more estuarine-derived organic matter. When assessed through depth/time, stable isotope trends indicated that decomposition is not the primary control. Instead, organic matter became increasingly more terrestrial in recent decades, especially in salt marshes with low fluvial loads. We hypothesize that salt marshes with lower loads took longer to regain lost elevation following coseismic subsidence of the 1700 <span>ce</span> Cascadia earthquake. This result magnifies the role of river floods in sediment and carbon accumulation on the marsh surface. Ultimately, the highest carbon burial rates coincided with highest fractions of terrestrially sourced organic matter, though spatiotemporal complexities obscured any potentially significant trends. While the term “blue” typically excludes terrestrial carbon, minerogenic salt marshes still perform the important ecosystem function of burying organic matter.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":"84-99"},"PeriodicalIF":3.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12739","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763498","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}

{"title":"Edge effects impact blue carbon dynamics across coastal ecotones in a tropical seascape","authors":"Erik S. Yando,&nbsp;Jahson B. Alemu I,&nbsp;Kiah Eng Lim,&nbsp;Taylor M. Sloey,&nbsp;Michiel van Breugel,&nbsp;Natasha Bhatia,&nbsp;Daniel A. Friess","doi":"10.1002/lno.12734","DOIUrl":"10.1002/lno.12734","url":null,"abstract":"<p>Coastal wetlands are important for their ability to regulate global climate through the sequestration and long-term storage of carbon. Accurate quantification of ecosystem-specific carbon dynamics (including sequestration, storage, and fluxes) is needed to develop accurate carbon budgets that inform climate change mitigation. Most work to quantify carbon dynamics either use subsampling in core habitats or benefit transfers to upscale values. While these approaches are valuable, our understanding of carbon dynamics across ecosystem transitions and overall heterogeneity remains a critical gap in coastal ecosystems as boundaries are not always clear. In this study, we established transects across both mangrove and seagrass ecotones into adjacent tidal flats in Singapore to quantifying vegetation cover, soil carbon storage, and CO₂ fluxes. Vegetation cover in all transitions and soil carbon storage in most transitions followed a decreasing sigmoidal pattern from vegetated to unvegetated portions, but differed in rate and width. CO₂ fluxes followed a peak distribution in mangrove–tidal flat transitions with maximum values occurring within the mangroves and were correlated with pneumatophore density, while seagrasses saw a linear increase in CO₂ fluxes from the seagrass to tidal flat. Seascape analysis of soil carbon showed site-specific impacts that resulted in differences in carbon stocks (0%–8%) as well as the width of these transitions. This study highlights the importance of understanding ecotones to better account for edge effects, which can lead to the over or under estimation of carbon, and provides a needed step in increasing the accuracy of blue carbon assessments in these critical ecosystems.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":"54-67"},"PeriodicalIF":3.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12734","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763499","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}

{"title":"Shifting phenology as a key driver of shelf zooplankton population variability","authors":"Isabel A. Honda,&nbsp;Rubao Ji,&nbsp;Gregory L. Britten,&nbsp;Cameron Thompson,&nbsp;Andrew R. Solow,&nbsp;Zhengchen Zang,&nbsp;Jeffrey A. Runge","doi":"10.1002/lno.12752","DOIUrl":"10.1002/lno.12752","url":null,"abstract":"<p>The timing of biological events, known as phenology, plays a key role in shaping ecosystem dynamics, and climate change can significantly alter these timings. The Gulf of Maine on the Northeast U.S. Shelf is vulnerable to warming temperatures and other climate impacts, which could affect the distribution and production of plankton species sensitive to phenological shifts. In this study, we apply a novel data-driven modeling approach to long-term datasets to understand the population variability of <i>Calanus finmarchicus</i>, a lipid-rich copepod that is fundamental to the Gulf of Maine food web. Our results reveal how phenology impacts the complex intermingling of top-down and bottom-up controls. We find that early initiation of the annual phytoplankton bloom prompts an early start to the reproductive season for populations of <i>C. finmarchicus</i> in the inner Gulf of Maine, resulting in high spring abundance. This spring condition appears to be conducive to enhanced predation pressure later in the season, consequently resulting in overall low <i>C. finmarchicus</i> abundance in the fall. These biologically controlled dynamics are less pronounced in the outer Gulf of Maine, where water exchanges near the boundary have a greater influence. Our analysis augments existing hypotheses in fisheries oceanography and classical ecological theory by considering unique plankton life-history characteristics and shelf sea dynamics, offering new insights into the biological factors driving <i>C. finmarchicus</i> variability.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 1","pages":"178-188"},"PeriodicalIF":3.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12752","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142763596","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}

{"title":"Issue Information & Masthead","authors":"","doi":"10.1002/lno.12753","DOIUrl":"https://doi.org/10.1002/lno.12753","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 11","pages":"i"},"PeriodicalIF":3.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12753","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748933","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}

{"title":"Issue Information & TOC","authors":"","doi":"10.1002/lno.12755","DOIUrl":"https://doi.org/10.1002/lno.12755","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 11","pages":"iii"},"PeriodicalIF":3.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12755","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748935","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}

{"title":"Issue Information & Members","authors":"","doi":"10.1002/lno.12756","DOIUrl":"https://doi.org/10.1002/lno.12756","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"69 11","pages":"iv"},"PeriodicalIF":3.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12756","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748958","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}