Limnology and Oceanography Letters最新文献

{"title":"Aquatic macrophytes as nature-based solutions: Challenges and opportunities across inland and coastal waters","authors":"Morgan Botrel,&nbsp;Roxane Maranger,&nbsp;Lindsay L. Trottier,&nbsp;Mathieu Cusson,&nbsp;Lars L. Iversen,&nbsp;Fanny Noisette,&nbsp;Christian Nozais,&nbsp;Katrine Turgeon,&nbsp;Andrea Bertolo,&nbsp;Thibaud André-Alphonse,&nbsp;Simon Bélanger,&nbsp;Arthur de Grandpré,&nbsp;Jean-Olivier Goyette,&nbsp;Sabine Hilt,&nbsp;Ladd Johnson,&nbsp;Valérie Langlois,&nbsp;Martin Laporte,&nbsp;Félix Lauzon,&nbsp;Brigitte Légaré,&nbsp;Anne Ola,&nbsp;Marie-Pomme Presne-Poissant,&nbsp;Matthieu Prugne,&nbsp;Caroline Susini,&nbsp;Richard Zimmerman,&nbsp;Irene Gregory-Eaves","doi":"10.1002/lol2.70145","DOIUrl":"https://doi.org/10.1002/lol2.70145","url":null,"abstract":"<p>Macrophytes are foundation species whose use as nature-based solution (NbS) in aquatic ecosystems can help reduce climate change impacts while mitigating biodiversity loss. The discrepancy in research and application of macrophytes as NbS across inland and marine coastal ecosystems is an opportunity to expand the concept and learn from different approaches. We report on an initiative uniting marine and freshwater scientists that compared knowledge on macrophytes as NbS across realms, identified advances and gaps in their use, and synthesized challenges and opportunities for application. We conducted a bibliometric analysis and an expert participatory exercise around recent review papers. We reveal that most NbS papers on macrophytes are marine-focused, with distinct topics emphasized across realms, highlighting complementarity of expertise and potential extension to inland waters. We provide recommendations to encourage researchers and stakeholders to embrace the value of macrophytes across a broad range of contexts for a more sustainable future.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 4","pages":""},"PeriodicalIF":7.3,"publicationDate":"2026-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70145","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Rates and controls of methane emission from four Pacific northwest reservoirs with contrasting management regimes","authors":"David E. Ballenger,&nbsp;John A. Harrison","doi":"10.1002/lol2.70151","DOIUrl":"https://doi.org/10.1002/lol2.70151","url":null,"abstract":"<p>Although collectively reservoirs constitute a globally significant source of anthropogenic methane (CH₄), there are still few investigations of reservoir CH₄ fluxes and their controls that span multiple seasons, years, and reservoir types. Here we present results from a 2-yr study of diffusive and ebullitive CH₄ fluxes in four contrasting reservoirs in the Pacific Northwest United States. Using floating chambers outfitted with CH₄ sensors (<i>n</i> = 105), supported by gas chromatography and environmental monitoring, we identified chlorophyll <i>a</i>, water temperature, season, reservoir type (run-of-river vs. storage), and hydrostatic pressure fluctuations as significant predictors of CH₄ flux. These findings indicate that water-level fluctuations and chlorophyll <i>a</i> are associated with increased ebullitive flux in reservoir forebays, reinforce previous work demonstrating that neglecting ebullition can substantially underestimate total CH₄ emissions, and highlight that strong seasonal variability necessitates full annual sampling to accurately constrain emission estimates.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 4","pages":""},"PeriodicalIF":7.3,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70151","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Extraordinary methane levels in a small bar-built tropical estuary","authors":"William H. McDowell,&nbsp;Tatiana Barreto-Vélez,&nbsp;Ricardo Colón-Rivera,&nbsp;Jody D. Potter","doi":"10.1002/lol2.70147","DOIUrl":"https://doi.org/10.1002/lol2.70147","url":null,"abstract":"<p>Small estuaries link uplands and nearshore marine environments but are understudied in many regions. We quantified spatial and temporal variability in CH₄, CO₂, nutrients, and organic matter in a small, deep, bar-built tropical estuary in Fajardo, Puerto Rico. The estuary was typically impounded and strongly stratified at all three sampling locations. Across 5 sampling dates, the pycnocline was sharp, with salinity of 0 in the upper meter and up to 17 ppt at 3–5 m. Methane concentrations at the surface were extraordinarily high for a mangrove-fringed tropical estuary, averaging from 26 to 59 <i>μ</i>M at three stations. Surface methane flux was 17.1 mM/m²/day. Methane concentrations were high throughout the water column, declined temporarily following estuarine flushing that increased salinity, and were correlated with CO₂ (<i>r</i>² = 0.48, <i>p</i> &lt; 0.01). Small bar-built estuaries are common in Puerto Rico and other high-wave energy environments and should be included in assessments of greenhouse gas emissions.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 4","pages":""},"PeriodicalIF":7.3,"publicationDate":"2026-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70147","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148282575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Methane emissions from canals draining tropical peatlands: Constraining temporal variability and emissions pathways","authors":"Clarice R. Perryman,&nbsp;Jennifer C. Bowen,&nbsp;Desi Silviani Putri Aulian Barry,&nbsp;Erin Dayanti,&nbsp;Yulita Andriyani,&nbsp;Ruby L. Gates,&nbsp;Nisa Novita,&nbsp;Gusti Z. Anshari,&nbsp;Alison M. Hoyt","doi":"10.1002/lol2.70150","DOIUrl":"https://doi.org/10.1002/lol2.70150","url":null,"abstract":"<p>Drainage canals are potential hotspots of methane (CH₄) emissions from degraded peatlands in Southeast Asia. Estimates of CH₄ emissions from these canals remain scarce, and both the temporal variability and pathways of CH₄ emissions are uncertain. Here, we present a year-round study of CH₄ emissions from canals draining peatlands in Southeast Asia. We quantified diffusive and ebullitive fluxes and tracked canal CH₄ dynamics by measuring δ¹³C-CH₄. Diffusion was the primary pathway of CH₄ fluxes throughout the year, accounting for &gt; 80% of net CH₄ emissions. Periods of low rainfall limited CH₄ oxidation and enhanced diffusive CH₄ emissions, particularly in canals blocked to rewet the adjacent peat soils. By synthesizing data from past studies, we find an apparent decrease in canal CH₄ emissions with time following peatland drainage. Our results highlight the importance of considering seasonal to decadal variation in efforts to include drainage canals in the global CH₄ budget.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 4","pages":""},"PeriodicalIF":7.3,"publicationDate":"2026-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148282596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Where land meets water: The overlooked role of groundwater seepage in lake ecosystems","authors":"M. Sol Lisboa,&nbsp;Rebecca L. Schneider","doi":"10.1002/lol2.70146","DOIUrl":"https://doi.org/10.1002/lol2.70146","url":null,"abstract":"&lt;p&gt;Excess loading of nutrients remains one of the greatest threats to lake water quality and ecosystems (Domagalski et al. &lt;span&gt;2021&lt;/span&gt;; Essaid et al. &lt;span&gt;2021&lt;/span&gt;), despite big efforts to reduce nutrient input into lakes from the surrounding landscapes. Traditionally, phosphorus (P) has been considered the limiting nutrient in freshwater systems and has been identified as one of the main drivers of cultural eutrophication and nuisance algal growths (Carpenter et al. &lt;span&gt;1998&lt;/span&gt;; Schindler et al. &lt;span&gt;2016&lt;/span&gt;), while nitrogen (N) has been historically recognized as the primary limiting nutrient in marine settings (Howarth and Marino &lt;span&gt;2006&lt;/span&gt;). P concentrations have been correlated with chlorophyll-a concentrations in pelagic waters of many lakes worldwide (Vollenweider &lt;span&gt;1968&lt;/span&gt;). Schindler's landmark whole-lake experiment at Lake 226 (Schindler &lt;span&gt;1977&lt;/span&gt;) was pivotal in establishing P as the primary driver of eutrophication, directly influencing key regulatory actions such as P bans on detergents and national monitoring programs. However, P control has not always been effective at managing algal growth, and discussion about co-limitation, or even N limitation in lakes, and P limitation in coastal systems, has developed (Moss et al. &lt;span&gt;2012&lt;/span&gt;; Paerl and Xu &lt;span&gt;2023&lt;/span&gt;).&lt;/p&gt;&lt;p&gt;Point sources of P, particularly those originating from sewage discharges, have been extensively addressed and significantly reduced over time, due to effective regulatory measures and wastewater treatment practices (Orderud and Vogt &lt;span&gt;2013&lt;/span&gt;). Consequently, considerable research and management efforts have shifted to a focus on identification and control of diffuse, non-point sources (NPS) of pollution. The main pathways for NPS nutrients into lakes include precipitation, tributary discharge, overland stormwater runoff, and lacustrine groundwater discharge. Various land uses have been evaluated for their impact on water quality in rivers and lakes. Agricultural activities, specifically chronic fertilizer and manure applications, interact with exposed and eroded soils to make crop and livestock production both a primary source and critical pathway of nutrient transport into water bodies (Burt et al. &lt;span&gt;2008&lt;/span&gt;). Furthermore, increases in the frequency and magnitude of storm events and the associated runoff have elevated stream P loads due to the export of sediment-bound P during extreme climatic events. Despite improved awareness of the importance of watershed controls, water quality issues related to excess P loading persist (Kleinman et al. &lt;span&gt;2015&lt;/span&gt;). In addition, the frequency of harmful algal blooms (HABs) has increased in lakes worldwide, highlighting the continuing challenges of nutrient fluxes management into aquatic systems (Feng et al. &lt;span&gt;2024&lt;/span&gt;). However, while attention has shifted toward diffuse P sources, the importance of groundwater seepage and internal loading from la","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 4","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Parameterizing air–sea CO2 transfer in a macroalgal habitat and assessing its role in marine carbon dioxide removal accounting","authors":"Bryce Van Dam","doi":"10.1002/lol2.70139","DOIUrl":"https://doi.org/10.1002/lol2.70139","url":null,"abstract":"<p>Accurately quantifying air–sea CO₂ exchange remains a central challenge for the measurement, reporting, and verification (MRV) of marine carbon dioxide removal. I apply direct eddy covariance measurements of CO₂ fluxes at a macroalgae-dominated coast to compile the first gas transfer velocity (<i>k</i>₆₆₀) parameterization for such a habitat. <i>k</i>₆₆₀ exhibited a quadratic dependence on wind speed of the form: <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>k</mi>\u0000 <mn>660</mn>\u0000 </msub>\u0000 <mo>=</mo>\u0000 <mn>0.183</mn>\u0000 <mo>×</mo>\u0000 <msup>\u0000 <msub>\u0000 <mi>U</mi>\u0000 <mn>10</mn>\u0000 </msub>\u0000 <mn>2</mn>\u0000 </msup>\u0000 <mo>+</mo>\u0000 <mn>2.17</mn>\u0000 </mrow>\u0000 <annotation>$$ {k}_{660}=0.183times {U_{10}}^2+2.17 $$</annotation>\u0000 </semantics></math>. Random forest analysis showed that wind speed and wind-wave interaction control <i>k</i>₆₆₀ at high wind speed, and a suite of drivers enhance <i>k</i>₆₆₀ under calm conditions, generating a non-zero intercept with significant impacts for CO₂ flux modelling. A simulated macroalgal marine carbon dioxide removal intervention demonstrated the sensitivity of removals to <i>k</i>₆₆₀ uncertainty, via its effect on CO₂ equilibration timescale, with variation across <i>k</i>₆₆₀ models causing shifts comparable to those by operational emissions. Finally, a new framework embedding site-specific equilibration dynamics into marine carbon dioxide removal accounting is presented, offering an understandable and defensible tool for measurement, reporting, and verification.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 4","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Primary productivity coupled to oxic methane production in coastal waters of southern China","authors":"Yuming Rao,&nbsp;Guang Gao,&nbsp;Mina Bizic,&nbsp;Ilana Berman-Frank,&nbsp;Kunshan Gao","doi":"10.1002/lol2.70135","DOIUrl":"https://doi.org/10.1002/lol2.70135","url":null,"abstract":"<p>Oxic methane (CH₄) production (OMP) occurs in diverse oxygenated surface waters worldwide. However, phytoplankton-driven OMP in natural marine environments remains poorly documented. During a research cruise in the highly productive southern East China Sea, we measured OMP by incubating phytoplankton-rich surface waters and found that CH₄ production was positively correlated with chlorophyll <i>a</i> concentration and primary production, and that natural phytoplankton communities predominated by diatoms led to higher CH₄ production. Oxic methane production ranged between 0.9 and 2.1 mg CH₄ g Chl <i>a</i>⁻¹ h⁻¹, indicating that 0.02–0.06% of the photosynthetically fixed CO₂ could be released as CH₄. Measurements of the phytoplankton-free filtrate demonstrated a negligible contribution to OMP by heterotrophs, substantiating that phytoplankton are contributing to the CH₄ oversaturation in the coastal oxic layer of this region. Moreover, high OMP in the photic zone partially counterbalances photosynthetic CO₂ sequestration by phytoplankton and should be accounted for in assessing fluxes of greenhouse gases.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 4","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70135","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148128169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Amplifying effects of multiyear La Niña on phytoplankton biomass in the tropical Pacific","authors":"Lei Lin,&nbsp;Kun Xu,&nbsp;Wei Tan,&nbsp;Jinliang Liu,&nbsp;Bingzhang Chen,&nbsp;Dongyan Liu","doi":"10.1002/lol2.70143","DOIUrl":"https://doi.org/10.1002/lol2.70143","url":null,"abstract":"<p>Traditional views suggest that overall phytoplankton biomass in the tropical Pacific should be proportional to La Niña intensity because of enhanced nutrient supplies from equatorial upwelling associated with La Niña intensity. Here, composite analysis of satellite-derived chlorophyll <i>a</i> (Chl <i>a</i>, a proxy for biomass) data across five multiyear La Niña (M-LN) events (1997–2023) showed a double increase in the tropical Pacific average Chl <i>a</i> in the 2^nd/3^rd years [La Niña(2)] of M-LN compared to the 1^st year [La Niña(1)], despite declining La Niña intensities. This unexpected rise is attributed to a ∼ 1-yr lagged response of the off-equatorial phytoplankton to La Niña/El Niño. The lagged response of off-equatorial Chl <i>a</i> to La Niña(1) superimposed with the immediate response of equatorial Chl <i>a</i> to La Niña(2) amplifies overall Chl <i>a</i> levels during La Niña(2). Simulations from Earth System Models support this mechanism. Our findings imply that increased M-LN events may mitigate warming-induced biomass decline in the tropical Pacific.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70143","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148049158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148049186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ponds are neither dimictic nor polymictic: A variable transition season between stratified summers and mixed autumns","authors":"David C. Richardson,&nbsp;Meredith A. Holgerson,&nbsp;Lauren E. Bortolotti,&nbsp;Pascal Bodmer,&nbsp;Julia Daly,&nbsp;Dominique X. Edwards,&nbsp;Kian A. Gallagher,&nbsp;Kathryn A. Gannon,&nbsp;Amanda L. Gavin,&nbsp;Rachel Hovel,&nbsp;Jacques C. Finlay,&nbsp;Kerri Finlay,&nbsp;Daniel J. Hornbach,&nbsp;Benjamin D. Janke,&nbsp;Alexia S. Leone,&nbsp;Jorrit P. Mesman","doi":"10.1002/lol2.70134","DOIUrl":"https://doi.org/10.1002/lol2.70134","url":null,"abstract":"<p>Autumn is an important transition time for seasonally stratified lakes where summertime stratification shifts to cooler, mixed periods. While ponds can also experience prolonged summertime stratification, their relatively low water volume accelerates mixing, suggesting they could have distinctly different autumn mixing dynamics compared to lakes. This study examined the mixing dynamics of mostly temperate, small, shallow, and summertime stratified waterbodies. We show that, in contrast to most lakes, ponds have long and distinctive stratified to mixing transition seasons, characterized by repeated mixing and restratification, which can occur for days to months, before sustained isothermal conditions. Transition season mixing starts earlier in shallower and low-nutrient ponds, with most ponds having at least one continuous week of restratification in autumn. Ultimately, describing pond transition seasons provides an important update to established turnover paradigms for lakes and indicates that these periods have the potential for high biogeochemical and ecological activity.</p>","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"11 3","pages":""},"PeriodicalIF":5.0,"publicationDate":"2026-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lol2.70134","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148049159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}