Limnology and Oceanography最新文献

{"title":"Stable isotopes reveal that gelatinous zooplankton diets group by taxonomy and feeding traits in a coastal upwelling system","authors":"Elizabeth Wallace,&nbsp;Luke A. Bobay,&nbsp;Lucas C. R. Silva,&nbsp;Su Sponaugle,&nbsp;Robert K. Cowen,&nbsp;Kelly R. Sutherland","doi":"10.1002/lno.70478","DOIUrl":"10.1002/lno.70478","url":null,"abstract":"<p>Gelatinous zooplankton are abundant in marine ecosystems, yet their trophic roles and functional diversity in food webs have only recently gained attention. Gelatinous zooplankton taxa including hydromedusae, ctenophores, siphonophores, chaetognaths, and pelagic tunicates span multiple phyla and are often grouped taxonomically, but trait-based categorizations have emerged as an ecologically meaningful alternative. Considering their wide variety of diets and feeding modes, we examined whether gelatinous zooplankton diet diversity can be described by feeding mode or phylum categorizations. We analyzed the carbon and nitrogen stable isotope composition (δ¹³C and δ¹⁵N values) of 490 gelatinous zooplankton samples of 32 genera/species collected across seasons and shelf positions in the northern California Current ecosystem. The δ¹³C and δ¹⁵N values fell into distinct groups when taxa were categorized three ways—by phylum, feeding mode, and feeding anatomy—indicating that both taxonomic and trait-based approaches are useful for describing the trophic diversity of gelatinous zooplankton. Even when gelatinous specimens cannot be identified taxonomically, their diets likely resemble those of taxa sharing the same feeding mode or anatomy. These insights refine our knowledge of marine food webs and facilitate the incorporation of these ubiquitous members of the food web into ecosystem models.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70478","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675044","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":"Morphological and trophic coupling distinguishes coral clades along a light gradient","authors":"Taylor R. Lindsay,&nbsp;Hana-lei Evans,&nbsp;Morgan Schwartz,&nbsp;Kelton W. McMahon,&nbsp;Carlos Prada","doi":"10.1002/lno.70469","DOIUrl":"10.1002/lno.70469","url":null,"abstract":"<p>Light availability is critical to the growth and survival of most scleractinian corals due to their endosymbiotic relationship with photosynthetic dinoflagellates. Natural light gradients are expected to be associated with shifts in coral physiology, morphology, and trophic strategy. However, few studies have assessed the interplay of these biological metrics simultaneously in multiple species. We collected three coral species from each of the two scleractinian clades along a light gradient in La Parguera, Puerto Rico, and quantified corallite morphology, symbiont physiology, tissue condition, and trophic strategy. All six species experienced significant morphological change and minimal physiological change along the light gradient. Stable isotope niche analyses indicated significant decoupling between coral host and symbiont isotopic niches, consistent with a high reliance on heterotrophy in most species. This pattern was not strongly modulated by light availability in any species. However, trophic strategy differed between clades and covaried with corallite size, offering novel insights into characteristics that may differentiate clades. Our results suggest that corals change their morphologies in response to light availability to maintain physiological and trophic performance.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70469","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148633711","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":"Food availability impacts oxygen isotope composition in freshwater snail shells","authors":"Tom de Vries,&nbsp;Rashmi T. Bopitiya,&nbsp;Sophia Weise,&nbsp;H. Jeroen L. van der Lubbe,&nbsp;Brendan Oerlemans,&nbsp;Frank J. C. Peeters,&nbsp;Suzan Warmerdam-Verdegaal,&nbsp;Joris M. Koene,&nbsp;Niels J. de Winter","doi":"10.1002/lno.70454","DOIUrl":"https://doi.org/10.1002/lno.70454","url":null,"abstract":"<p>Freshwater mollusk shells serve as valuable archives for the reconstruction of past environmental conditions as they record water temperatures in their stable isotopic compositions during biomineralization. Yet, the impact of food availability on these isotopic records has never been fully explored. This study addresses that gap by investigating the effects of both temperature and food regime on the stable carbon (δ¹³C) and oxygen (δ¹⁸O) isotope compositions in the shells of the freshwater gastropod <i>Lymnaea stagnalis</i>. Under controlled laboratory conditions, snails were reared at six distinct temperatures and two food regimes (limited and unlimited). The results reveal strong but significantly different negative relationships between the δ¹⁸O fractionation factor and water temperature per food regime. The relationship for the limited food regime is expressed as: <i>T</i> (°C) = (19.99 ± 0.16) − (4.30 ± 0.16) × (δ¹⁸O_a−w) + (0.20 ± 0.09) × (δ¹⁸O_a−w)². For the unlimited food regime as follows: <i>T</i> (°C) = (21.60 ± 0.24) − (4.33 ± 0.14) × (δ¹⁸O_a−w) + (0.20 ± 0.09) × (δ¹⁸O_a−w)². This study identified a 1.63°C ± 0.03°C offset in predicted temperatures between the two food regimes likely due to metabolically induced changes to carbonate δ¹⁸O fractionation. This offset introduces a previously unrecognized source of uncertainty in paleotemperature reconstructions and underscores the need to account for food availability when interpreting δ¹⁸O data. In addition, δ¹³C values exhibit high variability and no significant correlation with temperature for both food regimes, probably because the effect of temperature is overprinted by that of metabolism.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70454","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148617174","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":"Strong spatial partitioning of mesozooplankton in a dynamic frontal zone shapes trophic transfer efficiency","authors":"Pieter D. L. Hovenkamp,&nbsp;Myron A. Peck,&nbsp;A. Frank van der Stappen,&nbsp;Dick van Oevelen","doi":"10.1002/lno.70453","DOIUrl":"https://doi.org/10.1002/lno.70453","url":null,"abstract":"<p>Frontal zones are often areas of increased biological productivity and have hydrographic gradients on short spatial scales. The small scale of gradients poses a challenge in identifying differences in zooplankton community structure and trophic transfer efficiency through the pelagic food web. In this study, a towed in situ imaging system targeting meso- and macrozooplankton was deployed in a tidal mixing front in the North Sea along transects (with lengths of 5–34 km) covering the transition from the shallow Dogger Bank to deeper shelf waters. Environmental data, such as temperature and chlorophyll <i>a</i> (Chl <i>a</i>), were used to distinguish the dominant hydrographic regimes, and trophic transfer efficiency was calculated for each regime from planktonic size spectra. Zooplankton showed strong and significant partitioning among the hydrographic regimes. The warm oligotrophic surface layer was dominated by appendicularia and benthic meroplankton (mainly echinoderm larvae) that occurred in dense aggregations. Within regimes of high Chl <i>a</i>, we found significant differences in food web composition and efficiency. The subsurface chlorophyll maxima were narrow zones 5–10 m below the thermocline that supported the highest zooplankton biovolume and trophic transfer efficiency with high copepod abundance (3.1 <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>ind</mi>\u0000 <mo>.</mo>\u0000 <mspace></mspace>\u0000 <msup>\u0000 <mi>L</mi>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>1</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$$ mathrm{ind}.{mathrm{L}}^{-1} $$</annotation>\u0000 </semantics></math>). By contrast, enhanced Chl <i>a</i> regions above the bottom at the edge of the bank were dominated by centimeter-long diatom chains, and had low zooplankton abundances and reduced trophic transfer efficiency. The strong spatial partitioning of zooplankton communities and differences in trophic transfer efficiency among small-scale hydrographic regimes underscores the importance of high resolution, meter-scale sampling.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70453","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616897","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":"Spatial variability of hydrodynamics in oyster reefs: Investigating the impact of canopy density on mean and turbulent flows","authors":"Manisha Thenuwara,&nbsp;Jyotismita Taye,&nbsp;Peter Vien,&nbsp;Kelly M. Kibler","doi":"10.1002/lno.70474","DOIUrl":"https://doi.org/10.1002/lno.70474","url":null,"abstract":"&lt;p&gt;This field study investigated how oyster canopy density modulates hydrodynamics of natural intertidal oyster reef. High-resolution velocity measurements were taken simultaneously within and above oyster canopies of variable density (solid volume fractions, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;Ø&lt;/mo&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ mathrm{O}= $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; 0.04–0.21). Flows responded monotonically to increasing canopy density up to a threshold (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;Ø&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ mathrm{O} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; ≈ 0.2), beyond which nonlinear transitions in flow–reef interaction were observed. For instance, flow attenuation and drag coefficients (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mi&gt;d&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {C}_{mathrm{d}} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) above the canopy increased with density until &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;Ø&lt;/mo&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;0.18&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ mathrm{O}=0.18 $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; (mean attenuation 48–65%, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mi&gt;d&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {C}_{mathrm{d}} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; 0.02–0.08). Beyond this threshold density, mean flows accelerated by 60%, and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;C&lt;/mi&gt;\u0000 &lt;mi&gt;d&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {C}_{mathrm{d}} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; decreased to ~ 0.01. Similarly, turbulent production and dissipation (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;~&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;10&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;5&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mn&gt;10&lt;/mn&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;7&lt;/mn&gt;\u0000 ","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70474","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616364","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":"Native Phragmites australis promotes greater carbon sequestration and stocks than Spartina alterniflora with future warming","authors":"Liujuan Xie,&nbsp;Siyuan Ye,&nbsp;Ken W. Krauss,&nbsp;Lixin Pei,&nbsp;Pan Zhou,&nbsp;Xigui Ding,&nbsp;Hans Brix","doi":"10.1002/lno.70467","DOIUrl":"https://doi.org/10.1002/lno.70467","url":null,"abstract":"<p>Climate model projections suggest a significant increase in global mean temperature by the end of the 21^st century. Elevated temperature affects plant physiology within coastal wetlands, thereby affecting carbon sequestration processes. There is, however, limited knowledge about how native and invasive coastal wetland plants differ in their physiological responses to climate warming; warming may further promote invasive plant expansion at the expense of carbon sequestration. Here, we simulated future projected temperature increases using in-situ open top chambers (OTCs) to understand photosynthetic and growth responses of a C₃ native grass, <i>Phragmites australis</i>, and a C₄ non-native grass, <i>Spartina alterniflora</i>, in Yancheng, China. Warming slightly reduced the leaf net photosynthetic rate (<i>P</i>_n), specific leaf area, and chlorophyll content of <i>P. australis</i>, potentially due to an earlier termination of its growing season within the OTCs. In contrast, warming significantly enhanced <i>P</i>_n and chlorophyll content in <i>S. alterniflora</i>. For both species, shoot height increased, whereas shoot density decreased. Warming decreased the overall aboveground biomass of <i>S. alterniflora</i> by 24.5%, but only slightly reduced that of <i>P. australis</i> (by 5.9%). The <i>P. australis</i> wetland maintained a greater carbon stock and sequestration rate than <i>S. alterniflora</i> under elevated temperatures (~ 1.5°C), despite an apparent enhancement of leaf-level ecophysiological function in <i>S. alterniflora</i>. As <i>S. alterniflora</i> invades Chinese marshes to the detriment of native plants, this implies potentially reduced carbon sequestration and biomass storage under future warming.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616401","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}

{"title":"Increasing artificial light at night enhances salmonid predator foraging efficiency in an urbanized lake","authors":"Jennifer A. Schulien,&nbsp;Tessa Code","doi":"10.1002/lno.70471","DOIUrl":"https://doi.org/10.1002/lno.70471","url":null,"abstract":"<p>Artificial light at night (ALAN) poses a threat to ecosystems globally. It includes both direct and indirect light, or skyglow, which occurs when ALAN scatters in the atmosphere, extending beyond its original source. We analyzed ALAN trends in Lake Washington, WA, from 2014 to 2023 using Visible Infrared Imaging Radiometer Suite (VIIRS) nighttime light measurements, evaluated the relationship between in situ and satellite measurements, and modeled predator search volumes for a juvenile salmon predator, cutthroat trout (<i>Oncorhynchus clarki</i>), as a function of ambient light and turbidity conditions. Open water regions experienced significant increases in ALAN, while nearshore areas primarily showed no or negative trends, revealing the role of skyglow in shaping open water light environments. Using a visual foraging model for cutthroat trout, we found that juvenile salmon at the shallow southern pelagic site experienced light 28 times brighter, resulting in a 168% greater predation vulnerability than those at the northern site. In the Ship Canal, a narrow corridor for outmigrating salmon, predator search volumes were 249% higher than at the southern site. These contrasts in predation vulnerability demonstrate how local conditions influence predator–prey dynamics and provide critical insight for targeting mitigation of both nearshore and distant light sources.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70471","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616366","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":"Centennial-scale phosphorus accumulation drives regeneration and internal loading in a boreal lake","authors":"Siqi Zhao,&nbsp;Xiaole Sun,&nbsp;Juha Niemistö,&nbsp;Timo Saarinen,&nbsp;Daniel J. Conley,&nbsp;Tom Jilbert","doi":"10.1002/lno.70476","DOIUrl":"https://doi.org/10.1002/lno.70476","url":null,"abstract":"<p>Legacy anthropogenic phosphorus (P) accumulated in sediments drives internal P loading in eutrophic lakes. However, predicting the temporal response of internal P loading to the external loading reduction is difficult due to the complexity of sedimentary P cycling. In this study, we use geochemical profiles obtained from a 180-cm sediment core to constrain a reaction-transport model and investigate the centennial-scale response of internal P loading to the catchment development in Lake Hiidenvesi, a eutrophic boreal lake. This includes the transitions into and out of the Little Ice Age (LIA) when land use in the region changed considerably. A set of linear regressions between particulate depositional fluxes and diffusion rates indicates that internal P loading is primarily controlled by the deposition of organic-P and iron (Fe) bound-P, which may be directly linked with external loading from the catchment. We also show the relatively lower external inputs and consequently lower internal P loading during the LIA. The closed connection between external and internal P loading suggests that lake mitigation would be achieved if the reductions of external loading and sedimentary deposition were maintained. Additionally, the burial of sedimentary humic-bound P (or total P dominated by humic-bound P) is sufficient to reflect the historical anthropogenic impacts in boreal lakes.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70476","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616363","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":"Contrasting fates of detritus in mangrove sediments: Microbial trade-offs between carbon storage and greenhouse gas emissions","authors":"Yuxing Hu,&nbsp;Qi Chen,&nbsp;Xiaomeng Wang,&nbsp;Yihua Cai,&nbsp;Guangyi Su,&nbsp;Yunxuan Li,&nbsp;Chen He,&nbsp;Quan Shi,&nbsp;Zekun Zhang,&nbsp;Ding He,&nbsp;Christian Lønborg,&nbsp;Nianzhi Jiao,&nbsp;Qiang Zheng","doi":"10.1002/lno.70468","DOIUrl":"https://doi.org/10.1002/lno.70468","url":null,"abstract":"<p>Mangroves are known as important carbon storage hotspots, yet their net climate benefit can be offset by large greenhouse gas emissions. In this study, we conducted a 1-yr in situ incubation coupled with high-resolution molecular and microbial analyses to elucidate the fate of two major types of mangrove detritus, including leaves (<i>Kandelia obovata</i> and <i>Sonneratia apetala</i>) and macroalgae (<i>Ulva prolifera</i>), via microbial metabolism. Approximately 50% of the added organic carbon from both sources was mineralized to CO₂, while 7.5% (leaves) and 9.7% (macroalgae) were emitted as methane (CH₄). Around 33.8% of the leaf-derived and 2.1% of the macroalgae-derived organic carbon contributed to longer-term carbon storage. CH₄ emissions from leaf litter offset approximately 11.1% of the net ecosystem productivity and were positively correlated with molecular formulas assigned to the aliphatic-like group and with sulfur- and phosphorus-containing molecular formulas. CH₄ production was initially dominated by methylotrophic methanogenesis (mostly <i>Methanolobus</i>), followed by more diverse pathways associated with <i>Methanosarcina</i>. Our results demonstrate that different types of mangrove detritus have distinct effects on sediment biogeochemistry and greenhouse gas emissions and highlight the need to account for both CO₂ and CH₄ emissions when assessing the climate benefits of mangrove ecosystems.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616365","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}

{"title":"Salinity, turbidity, and chlorophyll drive zooplankton succession in a temperate estuary under anthropogenic pressure","authors":"Johanna Biederbick,&nbsp;Christian Möllmann,&nbsp;Vanessa Russnak,&nbsp;Rolf Koppelmann","doi":"10.1002/lno.70470","DOIUrl":"https://doi.org/10.1002/lno.70470","url":null,"abstract":"<p>Estuarine zooplankton are vital primary consumers and essential for estuarine ecosystem functioning and productivity, but they face strong physico-biochemical gradients and often anthropogenically altered habitats that impact their succession. Detailed zooplankton community studies are scarce and outdated for the turbid and dredged Elbe estuary in northern Germany. We provide a comprehensive overview of micro-, meso- and macrozooplankton dynamics in the tidal Elbe River by examining their spatio-temporal succession relative to environmental factors. Using redundancy analyses, we analyzed zooplankton assemblages and abiotic conditions at six stations along a salinity gradient during seasonal sampling in 2021 and 2022. Salinity and chlorophyll <i>a</i> emerged as key factors structuring community patterns, with turbidity further affecting the spatial distribution. An autotrophic zone with high chlorophyll <i>a</i> levels and low turbidity was confined to a shallow freshwater zone upstream of the dredged Hamburg Harbor region, supporting a community dominated by freshwater micro- and mesozooplankton, such as rotifers and cladocerans, peaking in spring and summer. <i>Eurytemora affinis</i> was the most abundant copepod year-round throughout the estuary, exhibiting a marked tolerance to high turbidity. Coastal meso- and macrozooplankton taxa such as <i>Acartia</i> spp., <i>Paracalanus parvus</i>, and <i>Mesopodopsis slabberi</i> colonized only the lower estuarine zone due to their affinity for high salinities. Compared to earlier studies, overall zooplankton abundance has declined, potentially in response to climatic changes and environmental alterations from recent hydrological interventions. This study enhances our understanding of the environmental drivers shaping estuarine zooplankton dynamics, which is essential for their conservation in the face of global change.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 8","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70470","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148616367","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}