Maren A. Staniek, Christian Pansch, Lisa N. S. Shama, Knut Mehler, Anna Steinmann, Jack J. Middelburg, Lukas Meysick
Marine heatwaves are increasing globally in intensity and duration. To investigate the potential consequences for coastal ecosystems, the effects of short‐term heat stress must be better understood. This study examined eco‐physiological responses in two common intertidal bivalves, Cerastoderma edule and Macoma balthica, to different heatwave intensities in a mesocosm experiment under near‐natural environmental conditions. Single‐species assemblages were exposed to a 15‐d heatwave of either +2.8°C (mild heatwave) or +4.4°C (strong heatwave) above ambient temperatures. Survival and condition were monitored, and filtration rates were measured before and during heatwave exposure to investigate feeding behavior. Bivalve respiration rates were measured before, during, and after heatwave exposure as a proxy for metabolic responses. For C. edule, we found significantly elevated filtration rates during the mild but not the strong heatwave. For M. balthica, survival was similar across treatments, but marine heatwaves had a significant effect on the condition index (tissue/shell mass ratio). During heatwave exposure, respiration rates were similar across treatments for both species. However, following the heatwaves, bivalves previously exposed to a strong heatwave showed lower respiration rates compared to those exposed to an ambient or a mild heatwave. This study revealed that short‐term heatwaves can have persisting negative effects on bivalve metabolism and that the two species responded differently to the heatwave intensities. Further research is needed on the potential long‐term effects of marine heatwaves on intertidal fauna and their capacity to continue providing crucial ecosystem services.
{"title":"Heatwave intensity drives eco‐physiological responses in infaunal bivalves: A mesocosm experiment","authors":"Maren A. Staniek, Christian Pansch, Lisa N. S. Shama, Knut Mehler, Anna Steinmann, Jack J. Middelburg, Lukas Meysick","doi":"10.1002/lno.70012","DOIUrl":"https://doi.org/10.1002/lno.70012","url":null,"abstract":"Marine heatwaves are increasing globally in intensity and duration. To investigate the potential consequences for coastal ecosystems, the effects of short‐term heat stress must be better understood. This study examined eco‐physiological responses in two common intertidal bivalves, <jats:italic>Cerastoderma edule</jats:italic> and <jats:italic>Macoma balthica</jats:italic>, to different heatwave intensities in a mesocosm experiment under near‐natural environmental conditions. Single‐species assemblages were exposed to a 15‐d heatwave of either +2.8°C (mild heatwave) or +4.4°C (strong heatwave) above ambient temperatures. Survival and condition were monitored, and filtration rates were measured before and during heatwave exposure to investigate feeding behavior. Bivalve respiration rates were measured before, during, and after heatwave exposure as a proxy for metabolic responses. For <jats:italic>C. edule</jats:italic>, we found significantly elevated filtration rates during the mild but not the strong heatwave. For <jats:italic>M. balthica</jats:italic>, survival was similar across treatments, but marine heatwaves had a significant effect on the condition index (tissue/shell mass ratio). During heatwave exposure, respiration rates were similar across treatments for both species. However, following the heatwaves, bivalves previously exposed to a strong heatwave showed lower respiration rates compared to those exposed to an ambient or a mild heatwave. This study revealed that short‐term heatwaves can have persisting negative effects on bivalve metabolism and that the two species responded differently to the heatwave intensities. Further research is needed on the potential long‐term effects of marine heatwaves on intertidal fauna and their capacity to continue providing crucial ecosystem services.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"84 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143532715","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}
Marine Escura, Apostolos‐Manuel Koussoroplis, Christian Desvilettes
In temperate low‐order streams and rivers, the macroinvertebrate community has a key role in the flow of matter and energy. Despite its relative scarcity, in‐stream primary producers have a high functional importance for the macroinvertebrates as the main source of Long‐Chained PolyUnsaturated Fatty Acids (LC‐PUFAs), essential biochemical compounds for macroinvertebrates fitness. Among these primary producers, the trophic role of microalgae in periphytic biofilms has been largely studied over the last decades, while macroalgae (Rhodophyta, Ochrophyta) have been neglected or even ignored. We call for future studies quantifying macroalgal species and production in streams, their biochemical composition, as well as their nutritional value for stream invertebrates to assess their potential trophic role in stream food webs. Our literature review indicates that macroalgae can be seasonally and locally abundant in freshwater streams and that they are frequently found in the guts of numerous macroinvertebrate taxa. From a biochemical perspective, the macroalgal species studied are rich in LC‐PUFAs, particularly in Arachidonic Acid (ARA), an omega‐6 fatty acid, contrasting with periphytic biofilms, which are rich in the omega‐3 series, especially Eicosapentaenoic Acid (EPA). Consuming Rhodophyta and Ochrophyta macroalgae as a complementary resource could enable stream invertebrates to optimize their dietary EPA : ARA ratio.
在温带低阶溪流和河流中，大型无脊椎动物群落在物质和能量流动中起着关键作用。尽管相对稀少，但溪流中的初级生产者作为长链多不饱和脂肪酸（LC-PUFAs）的主要来源，对大型无脊椎动物具有高度的功能重要性，而长链多不饱和脂肪酸是大型无脊椎动物健康所必需的生化化合物。在这些初级生产者中，微藻在附生生物膜中的营养作用在过去几十年中得到了广泛研究，而大型藻类（红藻纲、赭藻纲）则被忽视甚至被忽略。我们呼吁今后对溪流中大型藻类的种类和产量、生化组成以及它们对溪流无脊椎动物的营养价值进行量化研究，以评估它们在溪流食物网中的潜在营养作用。我们的文献综述表明，淡水溪流中的大型藻类在季节性和局部地区都很丰富，它们经常出现在许多大型无脊椎动物类群的内脏中。从生化角度来看，所研究的大型藻类物种富含 LC-PUFA，尤其是花生四烯酸（ARA）（一种欧米伽-6 脂肪酸），与之形成鲜明对比的是，附生生物膜富含欧米伽-3 系列，尤其是二十碳五烯酸（EPA）。将红藻纲和赭藻纲大型藻类作为一种互补资源食用，可使溪流无脊椎动物优化膳食中 EPA 与 ARA 的比例。
{"title":"Red and brown macroalgae in temperate stream food webs: Are we missing an important trophic link?","authors":"Marine Escura, Apostolos‐Manuel Koussoroplis, Christian Desvilettes","doi":"10.1002/lno.70007","DOIUrl":"https://doi.org/10.1002/lno.70007","url":null,"abstract":"In temperate low‐order streams and rivers, the macroinvertebrate community has a key role in the flow of matter and energy. Despite its relative scarcity, in‐stream primary producers have a high functional importance for the macroinvertebrates as the main source of Long‐Chained PolyUnsaturated Fatty Acids (LC‐PUFAs), essential biochemical compounds for macroinvertebrates fitness. Among these primary producers, the trophic role of microalgae in periphytic biofilms has been largely studied over the last decades, while macroalgae (Rhodophyta, Ochrophyta) have been neglected or even ignored. We call for future studies quantifying macroalgal species and production in streams, their biochemical composition, as well as their nutritional value for stream invertebrates to assess their potential trophic role in stream food webs. Our literature review indicates that macroalgae can be seasonally and locally abundant in freshwater streams and that they are frequently found in the guts of numerous macroinvertebrate taxa. From a biochemical perspective, the macroalgal species studied are rich in LC‐PUFAs, particularly in Arachidonic Acid (ARA), an omega‐6 fatty acid, contrasting with periphytic biofilms, which are rich in the omega‐3 series, especially Eicosapentaenoic Acid (EPA). Consuming Rhodophyta and Ochrophyta macroalgae as a complementary resource could enable stream invertebrates to optimize their dietary EPA : ARA ratio.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"1 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143526198","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":"Issue Information & Members","authors":"","doi":"10.1002/lno.70011","DOIUrl":"https://doi.org/10.1002/lno.70011","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 2","pages":"iv"},"PeriodicalIF":3.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431389","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.12802","DOIUrl":"https://doi.org/10.1002/lno.12802","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 2","pages":"i"},"PeriodicalIF":3.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.12802","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431246","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.70010","DOIUrl":"https://doi.org/10.1002/lno.70010","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 2","pages":"iii"},"PeriodicalIF":3.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431388","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.70009","DOIUrl":"https://doi.org/10.1002/lno.70009","url":null,"abstract":"","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"70 2","pages":"ii"},"PeriodicalIF":3.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431387","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}
Understanding the ocean's capacity potential to store dissolved organic carbon (DOC) is essential for predicting its role in long‐term carbon sequestration and climate regulation. This capacity hinges on the behavior of DOC at elevated concentrations, a critical yet unresolved question that has produced mixed results due to narrow concentration ranges tested previously and limited molecular insights. This study addresses these gaps by investigating microbial degradation of DOC across a broad concentration range (2‐ to 55‐fold) in year‐long bioassay experiments using solid‐phase extracted DOC (SPE‐DOC) from 2000‐m‐deep waters. Specific SPE‐DOC compounds (combined amino acids) were analyzed to provide a molecular‐level understanding of DOC reactivity at varying concentrations. Our results show that microbial communities rapidly proliferated and became more uniform following SPE‐DOC amendments, with Nitrosococcales, Flavobacteriales, and Alteromonadales dominating. Despite these shifts, microbial utilization of SPE‐DOC was constrained, exhibiting a nonlinear relationship with concentration, from < 3% in the control to a maximum of 9% in DOC‐enriched groups. Degradation was predominantly confined to the initial 28 d, with negligible additional removal (0–2%) thereafter. Compound‐specific analysis showed only moderate utilization (7–11%) of amino acid compounds within the first 3 d, indicating restricted microbial access even when these individual compounds were concentrated. These results indicate that a fraction of deep‐sea DOC molecules can persist for long at elevated concentrations. Our study demonstrates the ocean's substantial potential for DOC storage and suggests that modern ocean is capable of accommodating a larger DOC reservoir than is currently present.
{"title":"Limited microbial degradation of elevated concentrations of dissolved organic carbon in the deep ocean","authors":"Tao Liu, Yixian Li, Yuan Shen","doi":"10.1002/lno.70000","DOIUrl":"https://doi.org/10.1002/lno.70000","url":null,"abstract":"Understanding the ocean's capacity potential to store dissolved organic carbon (DOC) is essential for predicting its role in long‐term carbon sequestration and climate regulation. This capacity hinges on the behavior of DOC at elevated concentrations, a critical yet unresolved question that has produced mixed results due to narrow concentration ranges tested previously and limited molecular insights. This study addresses these gaps by investigating microbial degradation of DOC across a broad concentration range (2‐ to 55‐fold) in year‐long bioassay experiments using solid‐phase extracted DOC (SPE‐DOC) from 2000‐m‐deep waters. Specific SPE‐DOC compounds (combined amino acids) were analyzed to provide a molecular‐level understanding of DOC reactivity at varying concentrations. Our results show that microbial communities rapidly proliferated and became more uniform following SPE‐DOC amendments, with <jats:italic>Nitrosococcales</jats:italic>, <jats:italic>Flavobacteriales</jats:italic>, and <jats:italic>Alteromonadales</jats:italic> dominating. Despite these shifts, microbial utilization of SPE‐DOC was constrained, exhibiting a nonlinear relationship with concentration, from < 3% in the control to a maximum of 9% in DOC‐enriched groups. Degradation was predominantly confined to the initial 28 d, with negligible additional removal (0–2%) thereafter. Compound‐specific analysis showed only moderate utilization (7–11%) of amino acid compounds within the first 3 d, indicating restricted microbial access even when these individual compounds were concentrated. These results indicate that a fraction of deep‐sea DOC molecules can persist for long at elevated concentrations. Our study demonstrates the ocean's substantial potential for DOC storage and suggests that modern ocean is capable of accommodating a larger DOC reservoir than is currently present.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"30 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427160","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}
Zhiyuan Zhao, Jaco C. de Smit, Jacob J. Capelle, Tim Grandjean, Mingxuan Wu, Theo Gerkema, Johan van de Koppel, Tjeerd J. Bouma
Escalating high‐energy hydrodynamic events, like storms, represent a significant manifestation of global climate change, causing detrimental impacts on various ecosystems and potentially triggering thresholds that result in abrupt shifts in ecosystem states. Despite the potential of such thresholds, few studies have explicitly addressed them. This gap is particularly notable for subtidal ecosystems due to technological challenges in detecting responses of organisms enduring constant submersion. This study focused on subtidal soft‐bottom mussel beds through the development of Biophys loggers for in situ monitoring of the fine‐scale behavior of mussel clusters under hydrodynamic disturbances and a statistical model based on an 11‐yr dataset to perform regional‐scale assessments of mussel bed stability. Multisite monitoring in the Dutch Wadden Sea revealed spatial heterogeneity in mussel bed mobility threshold (i.e., near‐bed orbital velocity inducing mussel movement), with predictable patterns along elevation gradients. Stability assessment in this region demonstrated that mussel beds in shallower areas (i.e., at higher bed elevations) exhibited higher stability than those in deeper areas, a difference that was attributed to the longer return interval of the mobility thresholds in shallow regions. These findings suggest that conditions such as bed elevation can modulate the stress tolerance of mussels and thereby influence the stability of subtidal soft‐bottom mussel beds. This study provides an approach for assessing mussel bed stability, which can also be extended to other comparable ecosystems, such as oyster reefs, to address their stability under climate change, thereby informing strategic management.
{"title":"Differences in bed elevation shape subtidal mussel bed stability under high‐energy hydrodynamic events","authors":"Zhiyuan Zhao, Jaco C. de Smit, Jacob J. Capelle, Tim Grandjean, Mingxuan Wu, Theo Gerkema, Johan van de Koppel, Tjeerd J. Bouma","doi":"10.1002/lno.70005","DOIUrl":"https://doi.org/10.1002/lno.70005","url":null,"abstract":"Escalating high‐energy hydrodynamic events, like storms, represent a significant manifestation of global climate change, causing detrimental impacts on various ecosystems and potentially triggering thresholds that result in abrupt shifts in ecosystem states. Despite the potential of such thresholds, few studies have explicitly addressed them. This gap is particularly notable for subtidal ecosystems due to technological challenges in detecting responses of organisms enduring constant submersion. This study focused on subtidal soft‐bottom mussel beds through the development of Biophys loggers for in situ monitoring of the fine‐scale behavior of mussel clusters under hydrodynamic disturbances and a statistical model based on an 11‐yr dataset to perform regional‐scale assessments of mussel bed stability. Multisite monitoring in the Dutch Wadden Sea revealed spatial heterogeneity in mussel bed mobility threshold (i.e., near‐bed orbital velocity inducing mussel movement), with predictable patterns along elevation gradients. Stability assessment in this region demonstrated that mussel beds in shallower areas (i.e., at higher bed elevations) exhibited higher stability than those in deeper areas, a difference that was attributed to the longer return interval of the mobility thresholds in shallow regions. These findings suggest that conditions such as bed elevation can modulate the stress tolerance of mussels and thereby influence the stability of subtidal soft‐bottom mussel beds. This study provides an approach for assessing mussel bed stability, which can also be extended to other comparable ecosystems, such as oyster reefs, to address their stability under climate change, thereby informing strategic management.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"68 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417972","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}
Oceanic emission is a primary source of brominated very short‐lived substances (BrVSLs) to the atmosphere, which have important effects on stratospheric ozone chemistry. Marine biogeochemical processes regulating BrVSLs are often sensitive to ocean acidification. Yet, the response of BrVSLs production to acidification remains poorly understood. Herein, the effects of acidification on the production of two main BrVSLs, dibromomethane (CH2Br2) and tribromomethane (CHBr3), were studied by ship‐based incubation experiments at three stations in the South Atlantic and Indian Oceans. The average CH2Br2 and CHBr3 concentrations increased by 17.2–58.7% and 14.3–80.3% due to acidification under the in situ nutrient conditions with nutrient and/or iron limitation at the three stations, but the mechanisms driving these increases varied among different regions. The increased bromoperoxidase (BrPO) activity caused by acidification facilitated BrVSLs release in the Eastern Tropical Indian Ocean, where diatoms were dominant. CHBr3 increased due to acidification as a result of enhanced reactivity of dissolved organic matter (DOM) in the Eastern Tropical Atlantic, where dinoflagellates were dominant. Brominated very short‐lived substances increased due to acidification as a result of a combined effect of the above two mechanisms in the Benguela Current Coastal with high phytoplankton abundance. Under the nutrient and/or iron addition conditions with nutrient and iron sufficiency, however, acidification did not promote BrVSLs production due to its only minor effect on the BrPO activity and reactivity of DOM, partly because the effect of increased oxidative stress was offset by that of changed phytoplankton composition. Our study provided a basis for future modeling on the impact of acidification on global BrVSLs emissions.
{"title":"Carbon dioxide–induced acidification enhances short‐lived brominated hydrocarbons production in oligotrophic oceans","authors":"Ya‐Wen Zou, Cheng‐Xuan Li, Qin‐Sheng Wei, Qian‐Yao Ma, Hui Ding, Xiao Meng Duan, Xing Zhai, Bao‐Dong Wang","doi":"10.1002/lno.70004","DOIUrl":"https://doi.org/10.1002/lno.70004","url":null,"abstract":"Oceanic emission is a primary source of brominated very short‐lived substances (BrVSLs) to the atmosphere, which have important effects on stratospheric ozone chemistry. Marine biogeochemical processes regulating BrVSLs are often sensitive to ocean acidification. Yet, the response of BrVSLs production to acidification remains poorly understood. Herein, the effects of acidification on the production of two main BrVSLs, dibromomethane (CH<jats:sub>2</jats:sub>Br<jats:sub>2</jats:sub>) and tribromomethane (CHBr<jats:sub>3</jats:sub>), were studied by ship‐based incubation experiments at three stations in the South Atlantic and Indian Oceans. The average CH<jats:sub>2</jats:sub>Br<jats:sub>2</jats:sub> and CHBr<jats:sub>3</jats:sub> concentrations increased by 17.2–58.7% and 14.3–80.3% due to acidification under the in situ nutrient conditions with nutrient and/or iron limitation at the three stations, but the mechanisms driving these increases varied among different regions. The increased bromoperoxidase (BrPO) activity caused by acidification facilitated BrVSLs release in the Eastern Tropical Indian Ocean, where diatoms were dominant. CHBr<jats:sub>3</jats:sub> increased due to acidification as a result of enhanced reactivity of dissolved organic matter (DOM) in the Eastern Tropical Atlantic, where dinoflagellates were dominant. Brominated very short‐lived substances increased due to acidification as a result of a combined effect of the above two mechanisms in the Benguela Current Coastal with high phytoplankton abundance. Under the nutrient and/or iron addition conditions with nutrient and iron sufficiency, however, acidification did not promote BrVSLs production due to its only minor effect on the BrPO activity and reactivity of DOM, partly because the effect of increased oxidative stress was offset by that of changed phytoplankton composition. Our study provided a basis for future modeling on the impact of acidification on global BrVSLs emissions.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"16 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143401277","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}
Zhicheng Yang, Andrea D'Alpaos, Marco Marani, Tegan Blount, Merryl Alber, Brad Murray, Sonia Silvestri
Salt marshes are vital but vulnerable ecosystems. However, our understanding of disturbance‐induced dieback and recovery processes in multi‐specific marshes remains limited. This study utilized remote sensing data (2001–2021) to analyze a dieback event and subsequent recovery in the multi‐specific San Felice marsh within the Venice lagoon, Italy. A significant dieback of Spartina maritima (Spartina) was identified in 2003, likely triggered by a drought event and heat stress. This resulted in a conversion of 4.6 ha of marsh predominantly colonized by Spartina (fractional cover of Spartina > 50%) in 2001 to bare soil in 2003. These bare areas were then gradually encroached by vegetation, indicating the occurrence of the recovery. Despite gradually gaining ground, Spartina only dominated 6.4 ha marshes in 2021, significantly lower than its pre‐dieback area (21.3 ha). However, other species also encroached on the dieback area, such that the aboveground biomass returned to pre‐dieback levels, indicating that the shift in marsh species composition that occurred as a consequence of the event compensated for this ecosystem service. Vegetation recovery, spanning from 1 yr to more than 18 yr, was found to be slowest in areas of lowest elevation. This study provides evidence that dieback and recovery can modify the species composition of multi‐specific marshes over decades. These insights contribute to a better understanding of marsh resilience to drought and elevated temperature, both of which are likely to increase in the future.
{"title":"Recovery from drought‐induced dieback may lead to modified salt marsh vegetation composition","authors":"Zhicheng Yang, Andrea D'Alpaos, Marco Marani, Tegan Blount, Merryl Alber, Brad Murray, Sonia Silvestri","doi":"10.1002/lno.12795","DOIUrl":"https://doi.org/10.1002/lno.12795","url":null,"abstract":"Salt marshes are vital but vulnerable ecosystems. However, our understanding of disturbance‐induced dieback and recovery processes in multi‐specific marshes remains limited. This study utilized remote sensing data (2001–2021) to analyze a dieback event and subsequent recovery in the multi‐specific San Felice marsh within the Venice lagoon, Italy. A significant dieback of <jats:italic>Spartina maritima</jats:italic> (<jats:italic>Spartina</jats:italic>) was identified in 2003, likely triggered by a drought event and heat stress. This resulted in a conversion of 4.6 ha of marsh predominantly colonized by <jats:italic>Spartina</jats:italic> (fractional cover of <jats:italic>Spartina</jats:italic> > 50%) in 2001 to bare soil in 2003. These bare areas were then gradually encroached by vegetation, indicating the occurrence of the recovery. Despite gradually gaining ground, <jats:italic>Spartina</jats:italic> only dominated 6.4 ha marshes in 2021, significantly lower than its pre‐dieback area (21.3 ha). However, other species also encroached on the dieback area, such that the aboveground biomass returned to pre‐dieback levels, indicating that the shift in marsh species composition that occurred as a consequence of the event compensated for this ecosystem service. Vegetation recovery, spanning from 1 yr to more than 18 yr, was found to be slowest in areas of lowest elevation. This study provides evidence that dieback and recovery can modify the species composition of multi‐specific marshes over decades. These insights contribute to a better understanding of marsh resilience to drought and elevated temperature, both of which are likely to increase in the future.","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"160 1","pages":""},"PeriodicalIF":4.5,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143393043","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}
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