Robinson W. Fulweiler, Megan E. Berberich, Shelby A. Rinehart, Jason M. Taylor, Michelle C. Kelly, Nicholas E. Ray, Autumn Oczkowski, Sawyer J. Balint, Alexandra H. Geisser, Catherine R. Mahoney, Mar Benavides, Matthew J. Church, Brianna Loeks, Silvia E. Newell, Malin Olofsson, Jimmy C. Oppong, Sarah S. Roley, Carmella Vizza, Samuel T. Wilson, Peter M. Groffman, J. Thad Scott, Amy M. Marcarelli
Biological nitrogen fixation is the conversion of dinitrogen (N2) gas into bioavailable nitrogen by microorganisms with consequences for primary production, ecosystem function, and global climate. Here we present a compiled dataset of 4793 nitrogen fixation (N2‐fixation) rates measured in the water column and benthos of inland and coastal systems via the acetylene reduction assay, 15N2 labeling, or N2/Ar technique. While the data are distributed across seven continents, most observations (88%) are from the northern hemisphere. 15N2 labeling accounted for 67% of water column measurements, while the acetylene reduction assay accounted for 81% of benthic N2‐fixation observations. Dataset median area‐, volume‐, and mass‐normalized N2‐fixation rates are 7.1 μmol N2‐N m−2 h−1, 2.3 × 10−4μmol N2‐N L−1 h−1, and 4.8 × 10−4μmol N2‐N g−1 h−1, respectively. This dataset will facilitate future efforts to study and scale N2‐fixation contributions across inland and coastal aquatic environments.
{"title":"A global dataset of nitrogen fixation rates across inland and coastal waters","authors":"Robinson W. Fulweiler, Megan E. Berberich, Shelby A. Rinehart, Jason M. Taylor, Michelle C. Kelly, Nicholas E. Ray, Autumn Oczkowski, Sawyer J. Balint, Alexandra H. Geisser, Catherine R. Mahoney, Mar Benavides, Matthew J. Church, Brianna Loeks, Silvia E. Newell, Malin Olofsson, Jimmy C. Oppong, Sarah S. Roley, Carmella Vizza, Samuel T. Wilson, Peter M. Groffman, J. Thad Scott, Amy M. Marcarelli","doi":"10.1002/lol2.10459","DOIUrl":"https://doi.org/10.1002/lol2.10459","url":null,"abstract":"Biological nitrogen fixation is the conversion of dinitrogen (N<jats:sub>2</jats:sub>) gas into bioavailable nitrogen by microorganisms with consequences for primary production, ecosystem function, and global climate. Here we present a compiled dataset of 4793 nitrogen fixation (N<jats:sub>2</jats:sub>‐fixation) rates measured in the water column and benthos of inland and coastal systems via the acetylene reduction assay, <jats:sup>15</jats:sup>N<jats:sub>2</jats:sub> labeling, or N<jats:sub>2</jats:sub>/Ar technique. While the data are distributed across seven continents, most observations (88%) are from the northern hemisphere. <jats:sup>15</jats:sup>N<jats:sub>2</jats:sub> labeling accounted for 67% of water column measurements, while the acetylene reduction assay accounted for 81% of benthic N<jats:sub>2</jats:sub>‐fixation observations. Dataset median area‐, volume‐, and mass‐normalized N<jats:sub>2</jats:sub>‐fixation rates are 7.1 <jats:italic>μ</jats:italic>mol N<jats:sub>2</jats:sub>‐N m<jats:sup>−2</jats:sup> h<jats:sup>−1</jats:sup>, 2.3 × 10<jats:sup>−4</jats:sup> <jats:italic>μ</jats:italic>mol N<jats:sub>2</jats:sub>‐N L<jats:sup>−1</jats:sup> h<jats:sup>−1</jats:sup>, and 4.8 × 10<jats:sup>−4</jats:sup> <jats:italic>μ</jats:italic>mol N<jats:sub>2</jats:sub>‐N g<jats:sup>−1</jats:sup> h<jats:sup>−1</jats:sup>, respectively. This dataset will facilitate future efforts to study and scale N<jats:sub>2</jats:sub>‐fixation contributions across inland and coastal aquatic environments.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"3 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031319","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}
Phosphorus, an element essential to all life, is impacted by calcium carbonate (CaCO3) co‐precipitation and dissolution dynamics across aquatic ecosystems. Changes to climate, hydrology, and eutrophication, coupled with differences in terminology related to naming CaCO3‐producing ecosystems (i.e., chalk, carbonate, karst, travertine), point to the urgency and challenges in understanding this portion of the phosphorus cycle. Forms of CaCO3 vary across inland aquatic ecosystems, from “whiting events” in open waters to massive travertine or tufa formations to cemented layers on basal resources. And, across lakes, streams, and wetlands, periphyton mats and microbialites may form in photic regions. These biogenic carbonate structures beg the question: if aerobic photosynthesis promotes CaCO3 precipitation, but CaCO3 precipitation sequesters P, is this a challenge or opportunity for organisms? This review considers that question and others to better characterize this unexpectedly dynamic and influential portion of a major biogeochemical cycle.
{"title":"Calcium carbonate and phosphorus interactions in inland waters","authors":"Jessica R. Corman","doi":"10.1002/lol2.10452","DOIUrl":"https://doi.org/10.1002/lol2.10452","url":null,"abstract":"Phosphorus, an element essential to all life, is impacted by calcium carbonate (CaCO<jats:sub>3</jats:sub>) co‐precipitation and dissolution dynamics across aquatic ecosystems. Changes to climate, hydrology, and eutrophication, coupled with differences in terminology related to naming CaCO<jats:sub>3</jats:sub>‐producing ecosystems (i.e., chalk, carbonate, karst, travertine), point to the urgency and challenges in understanding this portion of the phosphorus cycle. Forms of CaCO<jats:sub>3</jats:sub> vary across inland aquatic ecosystems, from “whiting events” in open waters to massive travertine or tufa formations to cemented layers on basal resources. And, across lakes, streams, and wetlands, periphyton mats and microbialites may form in photic regions. These biogenic carbonate structures beg the question: if aerobic photosynthesis promotes CaCO<jats:sub>3</jats:sub> precipitation, but CaCO<jats:sub>3</jats:sub> precipitation sequesters P, is this a challenge or opportunity for organisms? This review considers that question and others to better characterize this unexpectedly dynamic and influential portion of a major biogeochemical cycle.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"34 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026601","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}
Catriona L. C. Jones, Kelsey J. Solomon, Emily R. Arsenault, Katlin D. Edwards, Atefah Hosseini, Hadis Miraly, Alexander W. Mott, Karla Münzner, Igor Ogashawara, Carly R. Olson, Meredith E. Seeley, John C. Tracey
{"title":"Tried and true vs. shiny and new: Method switching in long‐term aquatic datasets","authors":"Catriona L. C. Jones, Kelsey J. Solomon, Emily R. Arsenault, Katlin D. Edwards, Atefah Hosseini, Hadis Miraly, Alexander W. Mott, Karla Münzner, Igor Ogashawara, Carly R. Olson, Meredith E. Seeley, John C. Tracey","doi":"10.1002/lol2.10438","DOIUrl":"https://doi.org/10.1002/lol2.10438","url":null,"abstract":"","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"74 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142992332","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}
Maria Byrne, Alexander Waller, Matthew Clements, Aisling S. Kelly, Michael J. Kingsford, Bailu Liu, Claire E. Reymond, Ana Vila‐Concejo, Monique Webb, Kate Whitton, Shawna A. Foo
The iconic Great Barrier Reef (GBR) experienced mass coral bleaching in early 2024. In the southern GBR, heat stress triggered severe and widespread bleaching to levels not previously recorded and impacted a diverse range of coral genera at One Tree Reef (OTR). Over 161 d, we tracked the health of 462 coral colonies from heatwave peak to autumn and winter cooling. In February and April, 66% and 80% of the colonies were bleached, respectively. By May, 44% of the bleached colonies were dead and 53% in July. In July, 31% of colonies were still bleached and 16% recovered. Goniopora developed black band disease contributing to high mortality. Colony collapse occurred in Acropora (95% mortality) with accumulation of algal‐fouled fragments. In‐water tracking of individual colonies showed rapid bleaching, disease onset and mortality. The protected status and offshore location did not protect OTR from heat stress bleaching and mortality.
{"title":"Catastrophic bleaching in protected reefs of the Southern Great Barrier Reef","authors":"Maria Byrne, Alexander Waller, Matthew Clements, Aisling S. Kelly, Michael J. Kingsford, Bailu Liu, Claire E. Reymond, Ana Vila‐Concejo, Monique Webb, Kate Whitton, Shawna A. Foo","doi":"10.1002/lol2.10456","DOIUrl":"https://doi.org/10.1002/lol2.10456","url":null,"abstract":"The iconic Great Barrier Reef (GBR) experienced mass coral bleaching in early 2024. In the southern GBR, heat stress triggered severe and widespread bleaching to levels not previously recorded and impacted a diverse range of coral genera at One Tree Reef (OTR). Over 161 d, we tracked the health of 462 coral colonies from heatwave peak to autumn and winter cooling. In February and April, 66% and 80% of the colonies were bleached, respectively. By May, 44% of the bleached colonies were dead and 53% in July. In July, 31% of colonies were still bleached and 16% recovered. <jats:italic>Goniopora</jats:italic> developed black band disease contributing to high mortality. Colony collapse occurred in <jats:italic>Acropora</jats:italic> (95% mortality) with accumulation of algal‐fouled fragments. In‐water tracking of individual colonies showed rapid bleaching, disease onset and mortality. The protected status and offshore location did not protect OTR from heat stress bleaching and mortality.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"17 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142988032","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}
The cycling of calcium carbonate (CaCO3) plays a significant role in deep‐water carbon sequestration and affects the buffer capacity of the upper ocean for absorbing atmospheric CO2. This study investigates the role of dissolved calcium (Ca) and potential alkalinity (PA) as tracers for CaCO3 cycling in the Southern Ocean. The correlation between PA and Ca concentrations in subantarctic and polar waters supports their use as effective tracers of the process of CaCO3 dissolution and precipitation. Estimates of particulate inorganic carbon export flux based on Ca concentration reveals substantial contributions in the Southern Ocean, with higher values in the subantarctic waters. These findings highlight the value of Ca and PA as tracers for understanding CaCO3 cycling and its role in carbon sequestration and buffering atmospheric CO2.
{"title":"Calcium carbonate cycling in the Southern Ocean: insights from dissolved calcium and potential alkalinity tracers","authors":"Yaojia Sun, Michael J. Ellwood","doi":"10.1002/lol2.10457","DOIUrl":"https://doi.org/10.1002/lol2.10457","url":null,"abstract":"The cycling of calcium carbonate (CaCO<jats:sub>3</jats:sub>) plays a significant role in deep‐water carbon sequestration and affects the buffer capacity of the upper ocean for absorbing atmospheric CO<jats:sub>2</jats:sub>. This study investigates the role of dissolved calcium (Ca) and potential alkalinity (PA) as tracers for CaCO<jats:sub>3</jats:sub> cycling in the Southern Ocean. The correlation between PA and Ca concentrations in subantarctic and polar waters supports their use as effective tracers of the process of CaCO<jats:sub>3</jats:sub> dissolution and precipitation. Estimates of particulate inorganic carbon export flux based on Ca concentration reveals substantial contributions in the Southern Ocean, with higher values in the subantarctic waters. These findings highlight the value of Ca and PA as tracers for understanding CaCO<jats:sub>3</jats:sub> cycling and its role in carbon sequestration and buffering atmospheric CO<jats:sub>2</jats:sub>.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"17 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142961527","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}
Beatriz Arellano‐Nava, Chris A. Boulton, David J. Reynolds, Paul G. Butler, James Scourse, Timothy M. Lenton, Paul R. Halloran
Amidst the ongoing climate crisis, the need for observation‐based prediction of environmental tipping points becomes increasingly urgent. Detecting loss of resilience within a system can provide early warnings for tipping points. This requires long, regularly spaced time‐series, characteristics that are rare among marine observational and proxy records. Due to their remarkable length and temporal resolution, records from bivalve shells offer a unique opportunity for assessing resilience in the marine environment. Here, we investigate the suitability of bivalve records for measuring changes in two resilience indicators, autocorrelation and variance. We find that increment‐width records typically considered robust can provide reliable resilience assessments. However, while autocorrelation is a generally robust indicator for increment‐width series, variance may exhibit biases mainly associated with age‐related effects. This work provides guidelines for obtaining reliable resilience assessments from bivalve records, unlocking their potential to provide early warnings for tipping points.
{"title":"From historians to forecasters: The potential of bivalve records to assess resilience and provide early warnings for marine tipping points","authors":"Beatriz Arellano‐Nava, Chris A. Boulton, David J. Reynolds, Paul G. Butler, James Scourse, Timothy M. Lenton, Paul R. Halloran","doi":"10.1002/lol2.10455","DOIUrl":"https://doi.org/10.1002/lol2.10455","url":null,"abstract":"Amidst the ongoing climate crisis, the need for observation‐based prediction of environmental tipping points becomes increasingly urgent. Detecting loss of resilience within a system can provide early warnings for tipping points. This requires long, regularly spaced time‐series, characteristics that are rare among marine observational and proxy records. Due to their remarkable length and temporal resolution, records from bivalve shells offer a unique opportunity for assessing resilience in the marine environment. Here, we investigate the suitability of bivalve records for measuring changes in two resilience indicators, autocorrelation and variance. We find that increment‐width records typically considered robust can provide reliable resilience assessments. However, while autocorrelation is a generally robust indicator for increment‐width series, variance may exhibit biases mainly associated with age‐related effects. This work provides guidelines for obtaining reliable resilience assessments from bivalve records, unlocking their potential to provide early warnings for tipping points.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"22 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142940186","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}
Vanessa Weber de Melo, Marc J.‐F. Suter, Anita Narwani
In aquatic ecosystems facing climate change, higher temperatures often co‐occur with alterations in resource availability. The metabolic theory of ecology uses activation energy to assess the sensitivity of biological processes to temperature, but neglects how resource availability might modify temperature sensitivities. To understand the impacts of resource limitation on temperature sensitivities, we performed experiments manipulating temperature and three key resources (nitrogen, phosphorus, and light) in six species of freshwater phytoplankton. We measured activation energies of population growth rates and how they were modulated by resource limitation. We find that the interaction of temperature and resource limitation is dependent on the resource type. Phosphorus limitation did not modify the temperature sensitivity of growth rates, light limitation reduced the sensitivity of growth rates to temperature in all species, and nitrogen limitation had species‐dependent effects. We explore how stoichiometry and cell physiology may explain the complex responses of phytoplankton to multiple environmental changes.
{"title":"Light and nutrients modulate the temperature‐sensitivity of growth in phytoplankton","authors":"Vanessa Weber de Melo, Marc J.‐F. Suter, Anita Narwani","doi":"10.1002/lol2.10453","DOIUrl":"https://doi.org/10.1002/lol2.10453","url":null,"abstract":"In aquatic ecosystems facing climate change, higher temperatures often co‐occur with alterations in resource availability. The metabolic theory of ecology uses activation energy to assess the sensitivity of biological processes to temperature, but neglects how resource availability might modify temperature sensitivities. To understand the impacts of resource limitation on temperature sensitivities, we performed experiments manipulating temperature and three key resources (nitrogen, phosphorus, and light) in six species of freshwater phytoplankton. We measured activation energies of population growth rates and how they were modulated by resource limitation. We find that the interaction of temperature and resource limitation is dependent on the resource type. Phosphorus limitation did not modify the temperature sensitivity of growth rates, light limitation reduced the sensitivity of growth rates to temperature in all species, and nitrogen limitation had species‐dependent effects. We explore how stoichiometry and cell physiology may explain the complex responses of phytoplankton to multiple environmental changes.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"6 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142937544","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}
Kai Ziervogel, Julia A. Sweet, Yixuan Song, Laura Bretherton, Matthew J. Rau, Antonietta Quigg, Uta Passow
Fragmentation of marine snow affects the downward flux of organic matter, and other aggregate‐associated compounds such as oil. Using phytoplankton aggregates, we demonstrate that marine snow with oil, termed marine oil snow, had a higher resistance to fragmentation compared to marine snow without oil when exposed to turbulence ex situ. At moderate shear levels, typical of the ocean mixed layer, 17% of marine snow without oil broke, whereas 63% of marine snow fragmented at intermediate shear. In contrast, only 17% and 33% of marine oil snow fragmented at the intermediate and highest shear levels, respectively. Our results suggest that oil increases the cohesion and stability of aggregates making them less susceptible to breaking. This work contributes toward explaining the exceptional oil sedimentation event following the 2010 spill in Gulf of Mexico. It also enhances our understanding of the factors that determine the probability of sinking aggregates to fragment.
{"title":"Sink or break: Oil increases resistance of phytoplankton aggregates to fragmentation","authors":"Kai Ziervogel, Julia A. Sweet, Yixuan Song, Laura Bretherton, Matthew J. Rau, Antonietta Quigg, Uta Passow","doi":"10.1002/lol2.10454","DOIUrl":"https://doi.org/10.1002/lol2.10454","url":null,"abstract":"Fragmentation of marine snow affects the downward flux of organic matter, and other aggregate‐associated compounds such as oil. Using phytoplankton aggregates, we demonstrate that marine snow with oil, termed marine oil snow, had a higher resistance to fragmentation compared to marine snow without oil when exposed to turbulence ex situ. At moderate shear levels, typical of the ocean mixed layer, 17% of marine snow without oil broke, whereas 63% of marine snow fragmented at intermediate shear. In contrast, only 17% and 33% of marine oil snow fragmented at the intermediate and highest shear levels, respectively. Our results suggest that oil increases the cohesion and stability of aggregates making them less susceptible to breaking. This work contributes toward explaining the exceptional oil sedimentation event following the 2010 spill in Gulf of Mexico. It also enhances our understanding of the factors that determine the probability of sinking aggregates to fragment.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"86 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142884253","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}
Arctic phytoplankton spring blooms have increased in magnitude and extent over the past two decades, particularly in waters near the sea ice edge. We develop an idealized model of phytoplankton dynamics that takes into account the role of sea ice meltwater flux and its impact on surface mixed layer depth. Satellite observations feature a characteristic peak in phytoplankton concentration at around 100 km from the ice edge. Model dynamics capture this peak and overall structure of the phytoplankton distribution. In the model, the characteristic spatial scale emerges from a balance of exponential growth near the ice edge, horizontal advection, and increased decay with distance from the ice as the mixed layer deepens. Observations and data further agree in that meltwater impacts phytoplankton concentrations up to 1000 km from the ice edge. Results suggest that reduced meltwater input under future sea ice retreat may suppress spring phytoplankton blooms in the region.
{"title":"A model of near‐sea ice phytoplankton blooms","authors":"C. W. Lester, T. J. W. Wagner, Dylan E. McNamara","doi":"10.1002/lol2.10449","DOIUrl":"https://doi.org/10.1002/lol2.10449","url":null,"abstract":"Arctic phytoplankton spring blooms have increased in magnitude and extent over the past two decades, particularly in waters near the sea ice edge. We develop an idealized model of phytoplankton dynamics that takes into account the role of sea ice meltwater flux and its impact on surface mixed layer depth. Satellite observations feature a characteristic peak in phytoplankton concentration at around 100 km from the ice edge. Model dynamics capture this peak and overall structure of the phytoplankton distribution. In the model, the characteristic spatial scale emerges from a balance of exponential growth near the ice edge, horizontal advection, and increased decay with distance from the ice as the mixed layer deepens. Observations and data further agree in that meltwater impacts phytoplankton concentrations up to 1000 km from the ice edge. Results suggest that reduced meltwater input under future sea ice retreat may suppress spring phytoplankton blooms in the region.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"31 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142867413","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}
Gabriel A. Juma, Cédric L. Meunier, Emily M. Herstoff, Anna M. Irrgang, Michael Fritz, Caroline Weber, Hugues Lantuit, Inga V. Kirstein, Maarten Boersma
Arctic regimes. Currently, warming accelerates the erosion of permafrost coasts and the associated discharge of sediment, carbon, and nutrients into the Arctic Ocean. However, the impacts of coastal erosion on planktonic food webs remain understudied. We aimed to (1) understand how coastal erosion impacts nearshore carbon, nutrient, and light regimes; (2) investigate the effects on primary production and energy transfer; and (3) predict how increased erosion will impact the productivity of consumers, and the overall food web interactions. We found that sediment discharge increases turbidity (darkening). This darkening is expected to hamper phytoplankton productivity, while additional carbon input will provide bacteria with direct energy sources, and shift the balance between basal autotrophic and heterotrophic production. Since the heterotrophic pathway has a lower efficiency, its dominance might negatively affect mesozooplankton. Increased Arctic coastal erosion might therefore influence planktonic food webs by changing mechanisms of energy mobilization and transfer to higher trophic levels.
{"title":"Future Arctic: how will increasing coastal erosion shape nearshore planktonic food webs?","authors":"Gabriel A. Juma, Cédric L. Meunier, Emily M. Herstoff, Anna M. Irrgang, Michael Fritz, Caroline Weber, Hugues Lantuit, Inga V. Kirstein, Maarten Boersma","doi":"10.1002/lol2.10446","DOIUrl":"https://doi.org/10.1002/lol2.10446","url":null,"abstract":"Arctic regimes. Currently, warming accelerates the erosion of permafrost coasts and the associated discharge of sediment, carbon, and nutrients into the Arctic Ocean. However, the impacts of coastal erosion on planktonic food webs remain understudied. We aimed to (1) understand how coastal erosion impacts nearshore carbon, nutrient, and light regimes; (2) investigate the effects on primary production and energy transfer; and (3) predict how increased erosion will impact the productivity of consumers, and the overall food web interactions. We found that sediment discharge increases turbidity (darkening). This darkening is expected to hamper phytoplankton productivity, while additional carbon input will provide bacteria with direct energy sources, and shift the balance between basal autotrophic and heterotrophic production. Since the heterotrophic pathway has a lower efficiency, its dominance might negatively affect mesozooplankton. Increased Arctic coastal erosion might therefore influence planktonic food webs by changing mechanisms of energy mobilization and transfer to higher trophic levels.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"242 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823092","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}
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