Limnology and Oceanography最新文献

{"title":"Issue Information & Masthead","authors":"","doi":"10.1002/lno.70115","DOIUrl":"10.1002/lno.70115","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 6","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144503179","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 & Copyright","authors":"","doi":"10.1002/lno.70114","DOIUrl":"10.1002/lno.70114","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 6","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144503253","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 form","authors":"","doi":"10.1002/lno.70116","DOIUrl":"10.1002/lno.70116","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 6","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144503255","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":"On the fundamental additive modes of ocean color absorption","authors":"J. Xavier Prochaska,&nbsp;Patrick Gray","doi":"10.1002/lno.70098","DOIUrl":"10.1002/lno.70098","url":null,"abstract":"<p>Previous principal component analyses of ocean color absorption coefficient spectra <span></span><math>\u0000 <mrow>\u0000 <mi>a</mi>\u0000 <mfenced>\u0000 <mi>λ</mi>\u0000 </mfenced>\u0000 </mrow></math> have shown the variation in these data is captured by a few eigenfunctions. Here, we perform an unsupervised, non-negative matrix factorization (NMF) of <span></span><math>\u0000 <mrow>\u0000 <mi>a</mi>\u0000 <mfenced>\u0000 <mi>λ</mi>\u0000 </mfenced>\u0000 </mrow></math> to derive their fundamental and physically interpretable modes. When applied independently to two large datasets—one semi-empirical and one from inline measurements of the <i>Tara</i> Microbiome expedition—we find that four NMF basis functions describe <span></span><math>\u0000 <mrow>\u0000 <mo>&gt;</mo>\u0000 <mn>99.9</mn>\u0000 <mo>%</mo>\u0000 </mrow></math> of the variance in each. Furthermore, despite significant differences between the datasets in methodology and by geographic and temporal acquisition, the two sets of basis functions show very similar features at wavelengths <span></span><math>\u0000 <mrow>\u0000 <mi>λ</mi>\u0000 <mo>≈</mo>\u0000 <mn>400</mn>\u0000 <mo>−</mo>\u0000 <mn>750</mn>\u0000 </mrow></math> nm. Two of the modes capture the amplitude and spectral slope of absorption by color dissolved organic matter and/or detritus. The other two describe absorption by phytoplankton (<span></span><math>\u0000 <mrow>\u0000 <msub>\u0000 <mi>a</mi>\u0000 <mi>ph</mi>\u0000 </msub>\u0000 </mrow></math>) separated into the pigments that couple tightly to the chlorophyll <i>a</i> (Chl <i>a</i>) 675 nm feature and another that captures <span></span><math>\u0000 <mrow>\u0000 <msub>\u0000 <mi>a</mi>\u0000 <mi>ph</mi>\u0000 </msub>\u0000 </mrow></math> variability at <span></span><math>\u0000 <mrow>\u0000 <mo>≈</mo>\u0000 <mn>450</mn>\u0000 </mrow></math> nm. Together, the majority of ocean color absorption is physically described by these four fundamental modes. We present several applications of the NMF analysis including the exploration of geographic trends in particulate composition, the search for outlier absorption spectra, and the application of a new, additive decomposition of <span></span><math>\u0000 <mrow>\u0000 <msub>\u0000 <mi>a</mi>\u0000 <mi>ph</mi>\u0000 </msub>\u0000 </mrow></math>. Lastly, we detail the limitations of this technique, especially in the context of mechanistic approaches more commonly adopted in the literature.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":"2267-2283"},"PeriodicalIF":3.7,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70098","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144503617","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":"Extreme temperature events directly and indirectly mediate evolutionary adaptation of zooplankton metabolic rate","authors":"Thomas Ruiz,&nbsp;Martin J. Kainz","doi":"10.1002/lno.70121","DOIUrl":"10.1002/lno.70121","url":null,"abstract":"<p>Under global warming, understanding the evolutionary adaptation of ectotherms resting metabolic rate (RMR) is critical for predicting long-term populations' response to temperature increases. While several studies have evaluated metabolic rate evolution under different thermal context, most focused on space-for-time substitutions rather than assessment of populations' adaptation over time. Here, applying the method of resurrection ecology, we used sediment cores as an archive of populations' evolution and hatched ephippia from different sediment layers to examine the metabolic evolution of modern vs. ancient <i>Daphnia longispina</i> populations. Focusing on an oligotrophic subalpine lake, for which temperature has been monitored for almost a century, we were able to link population response to historical thermal contexts. We demonstrate that modern (2021) clonal lines exhibit a 60% higher RMR than ancient ones (1997) when measured at 20°C. The higher RMR correlated with reduced juvenile growth rates at 20°C but increased survival rates at high temperatures, with a higher thermal limit 2°C higher in modern populations. These findings reflect a trade-off favoring survival over growth under warming and likely result from increased oxygen uptake capacities, which provide an advantage at high temperatures but constrain individual energy budgets at non-stressful temperatures. Overall, this study suggests that survival at extreme weather events, such as heatwaves, may play an important role in shaping the RMR adaptation of <i>Daphnia</i> and, more generally, zooplankton populations.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":"2256-2266"},"PeriodicalIF":3.7,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70121","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144488716","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":"Coral calcification mechanisms across a natural environmental mosaic in Hawai'i","authors":"Verena Schoepf,&nbsp;Andréa G. Grottoli,&nbsp;Rowan H. McLachlan,&nbsp;James T. Price,&nbsp;Christopher P. Jury,&nbsp;Robert J. Toonen,&nbsp;Eric H. De Carlo,&nbsp;Malcolm T. McCulloch","doi":"10.1002/lno.70118","DOIUrl":"10.1002/lno.70118","url":null,"abstract":"<p>Coral calcification is key to coral reef growth and function but may be compromised under increasing global and local stressors. Corals modify the carbonate chemistry of their calcifying fluid to facilitate calcification, but little is known about how these mechanisms vary across the substantial differences in reef seawater conditions that can occur over as little as a few kilometers. Here, we used boron-based geochemical proxies (δ¹¹B, B/Ca) to investigate how three common Hawaiian coral species (<i>Montipora capitata</i>, <i>Porites compressa</i>, <i>Porites lobata</i>) regulate the carbonate chemistry of the calcifying fluid along a natural environmental mosaic of seawater carbonate chemistry and significant wave height. We found that calcification mechanisms were governed by complex species and site interactions: while all species generally differed from each other in their calcifying fluid chemistry, they also responded differently to site-specific environmental conditions. These results highlight that there are varying degrees of calcification mechanism plasticity in response to changing environmental conditions. Furthermore, species-specific patterns of pH upregulation inside the calcifying fluid were good predictors of calcification responses to ocean acidification and warming in at least two of the three species, with <i>M. capitata</i> being a clear winner under future ocean conditions. Our findings provide important insights into how corals calcify across a natural environmental mosaic and highlight the differential potential for an adaptive capacity in calcification mechanisms in the face of intensifying climate change.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":"2223-2238"},"PeriodicalIF":3.7,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370469","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":"Microbial colonization and function of biofilms developing on plastics and bioplastics in a pristine mountain stream ecosystem","authors":"Mar Oliva-Albert,&nbsp;Alba Bellostas-Carreras,&nbsp;José Luis Guijosa-Ortega,&nbsp;Anna Doménech-Pascual,&nbsp;Judit Boadella,&nbsp;Joan Pere Casas-Ruiz,&nbsp;David Pineda-Morante,&nbsp;Yoann Menard,&nbsp;Laura Ayuso,&nbsp;Anna Lupon,&nbsp;Eugènia Martí,&nbsp;Helena Guasch,&nbsp;Joan Artigas,&nbsp;Anna M. Romaní","doi":"10.1002/lno.70107","DOIUrl":"10.1002/lno.70107","url":null,"abstract":"<p>Streams naturally receive allochthonous particulate organic materials, but human activity may contribute additional plastic litter inputs, which can affect ecosystem functioning. Our objective was to assess the effect of plastic and bioplastic inputs on microbial biomass and function in a pristine mountain stream. To do that, fragments of plastics (polyethylene—PE, polypropylene—PP), bioplastics (polyhydroxyalkanoate—PHA, polylactic acid—PLA), and wood (as a natural material) were immersed in the stream and collected after 120, 202, 316, and 383 d. Fungal, prokaryotic, and algal biomass, and autotrophic and heterotrophic functions (net primary production, extracellular enzyme activities, and nutrient uptake) were analyzed together with organic matter weight changes over time. Wood showed high fungal and prokaryotic biomass, phosphatase and β-glucosidase activities, and a significant weight loss, as related to the degradation process. In contrast, plastics and bioplastics did not lose weight and were mainly colonized by algae, suggesting that they serve as an inert surface and over-enhance primary production. However, phenol oxidase (ligninolytic enzyme) activity in plastics and bioplastics was similar to that in wood and increased with time together with heterotrophic biomass. This indicates that plastispheres can contribute to the degradation of plastics and bioplastics, which may become a carbon source in the long term. Overall, the observed dynamics of microbial biomass and metabolism in the plastispheres point to their potential effect on stream nutrient and carbon cycles. The study highlights the need for careful human activities in pristine mountain watersheds to avoid altering their ecosystem functioning.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":"2239-2255"},"PeriodicalIF":3.7,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370482","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":"Nuisance alga reduces lake partial pressure of carbon dioxide and carbon flux to the atmosphere in boreal lakes","authors":"Karla Münzner,&nbsp;Eva S. Lindström,&nbsp;Thomas Rohrlack","doi":"10.1002/lno.70081","DOIUrl":"10.1002/lno.70081","url":null,"abstract":"<p>Boreal lakes are generally seen as sources of carbon dioxide (CO₂) to the atmosphere, even though a part of them are periodically undersaturated with CO₂ and have the potential to be net-autotrophic. This undersaturation is the result of photosynthetic activity by phytoplankton, especially flagellated species like <i>Gonyostomum semen</i>, which form high-biomass blooms in brown water lakes. We hypothesized that CO₂ reduction by <i>G. semen</i> is common across boreal lakes, and that those reductions vary with dissolved organic carbon (DOC) concentrations across lakes. In our field study, we explored how <i>G. semen</i> abundance affected the partial pressure of CO₂ (<i>p</i>CO₂) in the water column and the estimated carbon flux to the atmosphere in four lakes in Sweden and Norway in summer 2021. We found that lake <i>p</i>CO₂ and carbon flux to the atmosphere decreased with increasing <i>G. semen</i> abundances, though all lakes still emitted CO₂ to the atmosphere. High DOC concentrations acted as a limiting factor for <i>G. semen</i> growth, indicating that <i>G. semen</i>'s potential to reduce <i>p</i>CO₂ and carbon flux to the atmosphere weakens with increasing DOC concentrations. Still, <i>G. semen</i>'s impact on <i>p</i>CO₂ and carbon flux to the atmosphere is relevant in a wider spatial context, because <i>G. semen</i> and other motile flagellated species are expected to increase in range and bloom frequency in boreal lakes. Thus, we propose that CO₂ fixation via photosynthesis is an underestimated factor in controlling CO₂ dynamics in boreal lakes, and that it should be included in large-scale CO₂ budget calculations.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":"2192-2207"},"PeriodicalIF":3.7,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70081","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341152","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":"Seasonally migrating zooplankton strongly enhance Southern Ocean carbon sequestration","authors":"Guang Yang,&nbsp;Angus Atkinson,&nbsp;Evgeny A. Pakhomov,&nbsp;Katrin Schmidt,&nbsp;Weilei Wang,&nbsp;Jennifer J. Freer,&nbsp;Geraint A. Tarling","doi":"10.1002/lno.70120","DOIUrl":"10.1002/lno.70120","url":null,"abstract":"<p>High-latitude zooplankton can sequester millions of tons of carbon due to their seasonal migration from the surface ocean to depth, and their respiration and mortality during overwintering. This seasonal vertical migration pump (SVMP) efficiently removes carbon but not limiting nutrients such as iron from the surface layers. However, this process is not included in Earth System Models and whole Southern Ocean estimates are still lacking. Here, we compile large datasets of Southern Ocean zooplankton biomass and physiology to estimate that the SVMP transports 65 Mt carbon annually to sequestration-achieving depths of &gt; 500 m. Mesozooplankton are the main agents (80%), followed by krill (14%), and salps (6%), with respiration and mortality at depth contributing a similar share. This SVMP adds greatly to existing modeled or measured estimates of Southern Ocean carbon sequestration, equating to 38–56% of particulate organic carbon flux at 500 m and 78–103% of the flux at 1000 m. Given their large biomass but projected change under polar warming, understanding how zooplankton transport carbon and nutrients will underpin improved model projections of ocean carbon storage in a warmer world.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":"2208-2222"},"PeriodicalIF":3.7,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370470","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":"Carbon dioxide fluxes of Arctic coastal ecosystems controlled by seasonal patterns of land-to-ocean connectivity","authors":"Alina C. Spera,&nbsp;Vanessa L. Lougheed","doi":"10.1002/lno.70101","DOIUrl":"10.1002/lno.70101","url":null,"abstract":"<p>The strength of coastal Arctic Ocean CO₂ uptake is vulnerable to landscape-scale changes such as hydrological intensification, changing climate, and alterations to terrestrial and aquatic biogeochemistry. Across a period of 4 yr (2019–2023) and three distinct sampling periods, we visited five coastal ecosystems of the Beaufort Sea with varying barrier island coverage to understand drivers of Arctic coastal CO₂ flux. The ice cover sampling period was characterized by the highest pCO₂ saturation and dissolved O₂ undersaturation. We observed a &gt; 100 <i>μ</i>atm difference in pCO₂ over shallow depths (up to 2 m) at 73% of ice-cover site visits. Notably, the geomorphology of barrier islands and channels controlled the flushing of colder Beaufort Sea waters across the systems and influenced the strength and appearance of both vertical thermohaline and pCO₂ stratification. The ice breakup period reflected spring freshet and was a net CO₂ sink during sampling, likely related to freshwater riverine dilution, CaCO₃ dissolution from sea ice melt, and water column algal activity. During the open water sampling period, the interaction of marine and terrestrial contributions predicted the strength of the CO₂ efflux, with freshwater inputs introducing higher temperatures and organic material, which increased remineralization. The capacity of these systems to act as CO₂ sources or sinks varies throughout the year and is largely driven by geomorphic conditions. Any spatially integrative studies of CO₂ flux or coastal productivity should consider the physical and biogeochemical heterogeneity of Arctic coastal ecosystems.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 8","pages":"2175-2191"},"PeriodicalIF":3.7,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144334964","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}