Journal of Sea Research最新文献_第2页

The distribution and characteristics of suspended particulate matter in the Palau-Caroline seamount area of the western tropical Pacific Ocean

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-02-01 DOI: 10.1016/j.seares.2024.102560

Lianhua He , Yanguang Liu , Gang Yang , Sen Shan , Aimei Zhu , Jingjing Gao

Suspended particulate matter (SPM) plays an important biogeochemical role in aquatic systems, and assessing SPM spatial trends during the current climate change period is important. In the autumn of 2018, seawater samples were collected from depths of 1, 20, 50, 100and 200 m in the water column at 62 stations within the Palau-Caroline seamount area in the western tropical Pacific Ocean. The SPM concentration was measured to assess spatial variability. The particulate nitrogen (PN) concentration, particulate organic carbon (POC) concentration, and δ¹³C_POC were measured at 30 stations to assess spatial variability and the source of the suspended particulate organic matter (POM). The SPM concentration ranged from 0 to 1.18 mg/L, with an average value of 0.18 ± 0.20 mg/L, which is consistent with the results of previous studies in the ocean. Marked variation was observed in the SPM distribution. High SPM concentrations were observed around the seamount area, indicating that the seamount significantly influenced the distribution of the SPM. The POC concentrations decreased with depth, whereas the PN concentrations did not exhibit a clear distribution pattern. This difference in distribution suggested that the sources, cycling pathways and other controlling geochemical processes differed between POC and PN. The C/N ratios were notably low, ranging from 0.4 to 8.3, with an average of 2.0 ± 1.6. The δ¹³C_POC values ranged from −27.7 ‰ to −23.4 ‰, showing clear stratification with higher (less negative) values in the upper water column. The distribution characteristics of POC, PN, δ¹³C_POC, and the C/N ratio indicate that small phytoplankton may influence the POM characteristics of the upper water column. The POM collected in the study area appears to be derived mainly from in situ biological production.

{"title":"The distribution and characteristics of suspended particulate matter in the Palau-Caroline seamount area of the western tropical Pacific Ocean","authors":"Lianhua He , Yanguang Liu , Gang Yang , Sen Shan , Aimei Zhu , Jingjing Gao","doi":"10.1016/j.seares.2024.102560","DOIUrl":"10.1016/j.seares.2024.102560","url":null,"abstract":"<div><div>Suspended particulate matter (SPM) plays an important biogeochemical role in aquatic systems, and assessing SPM spatial trends during the current climate change period is important. In the autumn of 2018, seawater samples were collected from depths of 1, 20, 50, 100and 200 m in the water column at 62 stations within the Palau-Caroline seamount area in the western tropical Pacific Ocean. The SPM concentration was measured to assess spatial variability. The particulate nitrogen (PN) concentration, particulate organic carbon (POC) concentration, and δ<sup>13</sup>C<sub>POC</sub> were measured at 30 stations to assess spatial variability and the source of the suspended particulate organic matter (POM). The SPM concentration ranged from 0 to 1.18 mg/L, with an average value of 0.18 ± 0.20 mg/L, which is consistent with the results of previous studies in the ocean. Marked variation was observed in the SPM distribution. High SPM concentrations were observed around the seamount area, indicating that the seamount significantly influenced the distribution of the SPM. The POC concentrations decreased with depth, whereas the PN concentrations did not exhibit a clear distribution pattern. This difference in distribution suggested that the sources, cycling pathways and other controlling geochemical processes differed between POC and PN. The C/N ratios were notably low, ranging from 0.4 to 8.3, with an average of 2.0 ± 1.6. The δ<sup>13</sup>C<sub>POC</sub> values ranged from −27.7 ‰ to −23.4 ‰, showing clear stratification with higher (less negative) values in the upper water column. The distribution characteristics of POC, PN, δ<sup>13</sup>C<sub>POC</sub>, and the C/N ratio indicate that small phytoplankton may influence the POM characteristics of the upper water column. The POM collected in the study area appears to be derived mainly from in situ biological production.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"203 ","pages":"Article 102560"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decadal trends in macrobenthic communities in offshore wind farms: Disentangling turbine and climate effects

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-02-01 DOI: 10.1016/j.seares.2024.102557

C. Jammar , A. Reynés-Cardona , J. Vanaverbeke , N. Lefaible , T. Moens , S. Degraer , U. Braeckman

We present results of a study covering 13 years of data (2008–2020), investigating for the first time the combined impacts of offshore windfarm (OWF) turbine-related and climate-related variables on soft-sediment macrobenthic communities in the Southern North Sea, focusing on two Belgian OWFs, Belwind and C-Power. We hypothesized that both turbine presence alongside climate change would affect macrobenthos in the long-term. Our analysis revealed that climate variables, particularly sea surface temperature (SST) influenced macrobenthos abundance, species richness and diversity. Species richness was additionally affected by the North Atlantic Oscillation (NAO). While most community indices increased with rising SST, diversity declined with higher temperatures. Our analysis supported that the already known short-term (max. 3 years) turbine-related impacts are consistent through time (13 years). Sediments near turbines and in deeper waters were richer in organic matter, characterized by finer sand, and supported more enriched soft-sediment communities compared to locations further away. A transition from the originally prevailing Nephtys cirrosa community towards a more diverse macrobenthic community was observed near the turbines. Our study emphasizes the need for long-term studies and the importance of distinguishing turbine presence from climate change effects when assessing the impacts of OWFs on marine ecosystems.

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引用次数: 0

Effects of western boundary currents and sea surface temperature anomalies on interannual variability of chub mackerel abundance in the Northwest Pacific

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-02-01 DOI: 10.1016/j.seares.2024.102561

Jiasheng Li , Weifeng Zhou , Yang Dai , Fenghua Tang , Yumei Wu , Heng Zhang , Xiumei Fan , Xuesen Cui

The abundance of chub mackerel (Scomber japonicus) in the Northwest Pacific has undergone significant changes in recent decades. To investigate the long-term and short-term impacts of environmental factors on the abundance of chub mackerel, Kuroshio volume transport in summer and winter, the Oyashio area, the Oyashio southern limit, and the Sea Surface Temperature Anomaly (SSTA), were selected to construct the ARDL-ECM model based on the Autoregression Distributed Lag (ARDL) method for 3 age groups with resource abundance as the response variable. The results showed that in short term effects there is a positive correlation between Kuroshio intensity and the chub mackerel abundance in winter, but a negative correlation in summer. Oyashio area can impact the fish abundance under 2 years old significantly (p < 0.001) and the change of Oyashio sourth limit only has a significant impact on the abundance of 0-age fish (p < 0.001). In the long-term relationship, Kuroshio significantly influences the abundance of fish aged 3 years and older (p < 0.001). SSTA had a significant impact on the abundance of all 3 age groups (p < 0.05), while Oyashio area may influence the fish abundance under 2 years old (p < 0.05). Furthermore, Oyashio south limit was found to affect the abundance of fish aged over 1 year (p < 0.01). SSTA can increase the abundance in both short term (p < 0.001) and long term (p < 0.001).The findings of this research may enhance our understanding of the variations in chub mackerel abundance in the Northwest Pacific.

{"title":"Effects of western boundary currents and sea surface temperature anomalies on interannual variability of chub mackerel abundance in the Northwest Pacific","authors":"Jiasheng Li , Weifeng Zhou , Yang Dai , Fenghua Tang , Yumei Wu , Heng Zhang , Xiumei Fan , Xuesen Cui","doi":"10.1016/j.seares.2024.102561","DOIUrl":"10.1016/j.seares.2024.102561","url":null,"abstract":"<div><div>The abundance of chub mackerel (<em>Scomber japonicus</em>) in the Northwest Pacific has undergone significant changes in recent decades. To investigate the long-term and short-term impacts of environmental factors on the abundance of chub mackerel, Kuroshio volume transport in summer and winter, the Oyashio area, the Oyashio southern limit, and the Sea Surface Temperature Anomaly (SSTA), were selected to construct the ARDL-ECM model based on the Autoregression Distributed Lag (ARDL) method for 3 age groups with resource abundance as the response variable. The results showed that in short term effects there is a positive correlation between Kuroshio intensity and the chub mackerel abundance in winter, but a negative correlation in summer. Oyashio area can impact the fish abundance under 2 years old significantly (<em>p</em> < 0.001) and the change of Oyashio sourth limit only has a significant impact on the abundance of 0-age fish (p < 0.001). In the long-term relationship, Kuroshio significantly influences the abundance of fish aged 3 years and older (<em>p</em> < 0.001). SSTA had a significant impact on the abundance of all 3 age groups (<em>p</em> < 0.05), while Oyashio area may influence the fish abundance under 2 years old (p < 0.05). Furthermore, Oyashio south limit was found to affect the abundance of fish aged over 1 year (<em>p</em> < 0.01). SSTA can increase the abundance in both short term (<em>p</em> < 0.001) and long term (p < 0.001).The findings of this research may enhance our understanding of the variations in chub mackerel abundance in the Northwest Pacific.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"203 ","pages":"Article 102561"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Social-ecological system approach relevant for modelling the ecological niche of a mangrove gastropod at small regional scale

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-02-01 DOI: 10.1016/j.seares.2025.102567

Rémi Brosse , Claire Golléty , Esméralda Longépée , Lucie Dupont , François-Xavier Lamure Tardieu , Yann Mercky , Gauthier Schaal

The gastropod Terebralia palustris is found in mangroves from the Indo-Pacific, where it plays important ecological roles and is fished by humans. As such, it reflects interactions occurring within the socio-ecosystem, although information regarding its regional distribution and ecological niche is uneven. The present study aimed at defining the relative importance of factors of the mangrove socio-ecological system (MSES) on the realized niche of T. palustris at the regional scale. We studied its distribution at the scale of Mayotte Island (France, Indian Ocean), including local ecological knowledge and environmental memory held by population. To this end, a survey campaign of the 29 mangroves of Mayotte allowed mapping its occurrence and correlating the spatial pattern to factors of the MSES related to three dimensions of the niche (accessibility, abiotic, and biotic) pertaining to both societal and ecological components. Questionnaire interviews revealed both past presence and current presence undetected by the survey campaign. At the scale of Mayotte, the gastropod is found on large and deep mangroves, distant from the sea by a deep central and external mangrove, where Avicennia marina is not the only mangrove tree species and the canopy is relatively opened, at the bottom of watersheds holding large urban areas. Our study showed that dealing with both ecosystemic and societal subsystems and their involvement in each dimension of the niche concept is a promising way of understanding the drivers of species distribution in anthropized systems.

{"title":"Social-ecological system approach relevant for modelling the ecological niche of a mangrove gastropod at small regional scale","authors":"Rémi Brosse , Claire Golléty , Esméralda Longépée , Lucie Dupont , François-Xavier Lamure Tardieu , Yann Mercky , Gauthier Schaal","doi":"10.1016/j.seares.2025.102567","DOIUrl":"10.1016/j.seares.2025.102567","url":null,"abstract":"<div><div>The gastropod <em>Terebralia palustris</em> is found in mangroves from the Indo-Pacific, where it plays important ecological roles and is fished by humans. As such, it reflects interactions occurring within the socio-ecosystem, although information regarding its regional distribution and ecological niche is uneven. The present study aimed at defining the relative importance of factors of the mangrove socio-ecological system (MSES) on the realized niche of <em>T. palustris</em> at the regional scale. We studied its distribution at the scale of Mayotte Island (France, Indian Ocean), including local ecological knowledge and environmental memory held by population. To this end, a survey campaign of the 29 mangroves of Mayotte allowed mapping its occurrence and correlating the spatial pattern to factors of the MSES related to three dimensions of the niche (accessibility, abiotic, and biotic) pertaining to both societal and ecological components. Questionnaire interviews revealed both past presence and current presence undetected by the survey campaign. At the scale of Mayotte, the gastropod is found on large and deep mangroves, distant from the sea by a deep central and external mangrove, where <em>Avicennia marina</em> is not the only mangrove tree species and the canopy is relatively opened, at the bottom of watersheds holding large urban areas. Our study showed that dealing with both ecosystemic and societal subsystems and their involvement in each dimension of the niche concept is a promising way of understanding the drivers of species distribution in anthropized systems.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102567"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143235054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Traits without boundaries: The environmental influence on biological traits across an intertidal region

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-02-01 DOI: 10.1016/j.seares.2024.102559

Natanah M.C. Gusha , Christopher D. McQuaid

Trait-based methods can present better alternatives to species-centric methods when the objective is to understand the drivers of species distribution patterns across macro-spatial scales. We employed a trait-based approach to understand benthic macroinvertebrate species distributions along the coastline of South Africa, hypothesising that the operation of selection on species' traits would produce different distributional results from the already known patterns based on taxonomic identity. We selected eight lifestyle and reproduction trait categories for 150 intertidal macroinvertebrates from 52 sites spanning three main bioregions (East, South, and West) and two transition zones (South-west and South-east) across c. 3025 km of the South African coast. We used satellite derived near-shore sea surface temperature (SST), chlorophyll-a data estimates and site location to characterise environmental conditions that may influence intertidal species and traits distribution. An RLQ analysis indicated that intertidal species trait distribution did not conform to the biogeographic patterns identified using a taxonomic approach. Further, a combined fourth corner analysis further revealed strong significant interactions of four of the eight traits (reproductive type, body form and feeding type) with environment parameters (longitude, SST and chl-a), plus weakly significant effects of latitude. Two major currents dominate nearshore waters, the cool, eutrophic Benguela on the west and the warm, oligotrophic Agulhas on the east and south, yet trait distribution grouped cool (west coast) and warm (south coast) temperate sites separately from subtropical eastern sites rather than aligning with the three main bioregions defined by species taxonomic identity. These results support the habitat templet theory, suggesting that environmental influences on species distributions operates through their effects on species traits, with chl-a/nutrient availability a key determinant of trait distributions. This results in a transition in species' traits from warm, oligotrophic to cool eutrophic conditions. This coarse transition between two oceanic regimes is further refined by species with varying trait combinations colonising from either the Indian and Atlantic oceans, resulting in the bioregions defined by species identity.

{"title":"Traits without boundaries: The environmental influence on biological traits across an intertidal region","authors":"Natanah M.C. Gusha , Christopher D. McQuaid","doi":"10.1016/j.seares.2024.102559","DOIUrl":"10.1016/j.seares.2024.102559","url":null,"abstract":"<div><div>Trait-based methods can present better alternatives to species-centric methods when the objective is to understand the drivers of species distribution patterns across macro-spatial scales. We employed a trait-based approach to understand benthic macroinvertebrate species distributions along the coastline of South Africa, hypothesising that the operation of selection on species' traits would produce different distributional results from the already known patterns based on taxonomic identity. We selected eight lifestyle and reproduction trait categories for 150 intertidal macroinvertebrates from 52 sites spanning three main bioregions (East, South, and West) and two transition zones (South-west and South-east) across c. 3025 km of the South African coast. We used satellite derived near-shore sea surface temperature (SST), chlorophyll-<em>a</em> data estimates and site location to characterise environmental conditions that may influence intertidal species and traits distribution<em>.</em> An RLQ analysis indicated that intertidal species trait distribution did not conform to the biogeographic patterns identified using a taxonomic approach. Further, a combined fourth corner analysis further revealed strong significant interactions of four of the eight traits (reproductive type, body form and feeding type) with environment parameters (longitude, SST and chl-<em>a</em>), plus weakly significant effects of latitude. Two major currents dominate nearshore waters, the cool, eutrophic Benguela on the west and the warm, oligotrophic Agulhas on the east and south, yet trait distribution grouped cool (west coast) and warm (south coast) temperate sites separately from subtropical eastern sites rather than aligning with the three main bioregions defined by species taxonomic identity. These results support the habitat templet theory, suggesting that environmental influences on species distributions operates through their effects on species traits, with chl-<em>a</em>/nutrient availability a key determinant of trait distributions. This results in a transition in species' traits from warm, oligotrophic to cool eutrophic conditions. This coarse transition between two oceanic regimes is further refined by species with varying trait combinations colonising from either the Indian and Atlantic oceans, resulting in the bioregions defined by species identity.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"203 ","pages":"Article 102559"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Epibenthic communities' structure in St. Pierre Bank revealed by underwater video

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-02-01 DOI: 10.1016/j.seares.2025.102562

Pauline Boët, Sonia Méhault, Julien Simon, Marie Morfin, Dorothée Kopp

Given the significant ecosystem services provided by benthic communities, monitoring their biodiversity enable to better understand how global changes would affect their structure in a context of biodiversity loss. Using underwater video transect, we characterize alpha and beta diversity of epibenthic communities, their structure and forcing factors in St. Pierre Bank; an area where marine benthos is still poorly documented. Video monitoring enables the detection of 74 different taxa belonging to eight phyla. Results highlighted three spatial entities of benthic assemblages distributed along a bathymetric gradient and primarily influenced by sedimentary types. In the southern and western area, rhodoliths beds substrate shelters the majority of echinoderms. The southern region was dominated by sea cucumber Cucumaria frondosa, whereas in the western area, brittle stars, and the green sea urchin Strongylocentrotus droebachiensis were dominant. Fishing activity was concentrated in the south, due to the presence of exploited sea cucumber. In contrast, the northern region featured patchy fine and soft substrates with a preponderance of giant scallop Placopecten magellanicus and sand dollar Echinarachnius parma. In addition to the contribution of environmental factors to the distribution of communities, this study highlights the complexity of several biotic interactions at the origin of these assemblages.

{"title":"Epibenthic communities' structure in St. Pierre Bank revealed by underwater video","authors":"Pauline Boët, Sonia Méhault, Julien Simon, Marie Morfin, Dorothée Kopp","doi":"10.1016/j.seares.2025.102562","DOIUrl":"10.1016/j.seares.2025.102562","url":null,"abstract":"<div><div>Given the significant ecosystem services provided by benthic communities, monitoring their biodiversity enable to better understand how global changes would affect their structure in a context of biodiversity loss. Using underwater video transect, we characterize alpha and beta diversity of epibenthic communities, their structure and forcing factors in St. Pierre Bank; an area where marine benthos is still poorly documented. Video monitoring enables the detection of 74 different taxa belonging to eight phyla. Results highlighted three spatial entities of benthic assemblages distributed along a bathymetric gradient and primarily influenced by sedimentary types. In the southern and western area, rhodoliths beds substrate shelters the majority of echinoderms. The southern region was dominated by sea cucumber <em>Cucumaria frondosa</em>, whereas in the western area, brittle stars, and the green sea urchin <em>Strongylocentrotus droebachiensis</em> were dominant. Fishing activity was concentrated in the south, due to the presence of exploited sea cucumber. In contrast, the northern region featured patchy fine and soft substrates with a preponderance of giant scallop <em>Placopecten magellanicus</em> and sand dollar <em>Echinarachnius parma</em>. In addition to the contribution of environmental factors to the distribution of communities, this study highlights the complexity of several biotic interactions at the origin of these assemblages.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"203 ","pages":"Article 102562"},"PeriodicalIF":2.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

No evidence that the Atlantic jackknife clam Ensis leei benefits from shrimp fisheries

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-02-01 DOI: 10.1016/j.seares.2024.102558

Jaap van der Meer , Johan Craeymeersch , Sander Glorius , Ingrid Tulp

Few experimental studies have been performed on the impact of shrimp fisheries on benthic life. One recent study observed an increase in densities of the Atlantic jackknife clam in hydraulic dredge samples at heavily fished plots and hypothesized that individuals may have been attracted by and immigrated into the disturbed areas (Tulp et al., 2020). We analysed additional box core data taken in the same experiment, and the results could not support this hypothesis. An alternative hypothesis that high densities of clams were coincidentally present in the heavily fished areas already before fishing, but were then too small to be included in the dredge, could neither be confirmed. Additional experiments are required to shed more light on the possible impact of shrimp fisheries on clam abundance and distribution.

引用次数: 0

Acoustic characteristics of Jesogammarus annandalei in Lake Biwa

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-01-25 DOI: 10.1016/j.seares.2025.102566

Naizheng Yan , Tohru Mukai , Kouichi Sawada , Kohei Hashimoto , Kanako Ishikawa

Mass mortality of Jesogammarus annandalei, an amphipod species endemic in Lake Biwa, has been recently observed. J. annandalei is useful in fisheries; therefore, analyzing its occurrence is important for conserving the species and maintaining biodiversity. The acoustic method can be used in monitoring the distribution and abundance of J. annandalei. Therefore, along with measuring total body length (TL), we measured the acoustic factor target strength (TS), density contrast g, and sound speed contrast h necessary for the application of the theoretical model (distorted-wave Born approximation model) of J. annandalei. The results indicated g = 1.0725 and h = 1.003, and the measured TS values agreed well with the estimated ones. The relationships between the average TS and TL at 38, 120, and 200 kHz were TS = 60.4logTL − 165.6; TS = 53.4logTL − 141.4; and TS = 46.5logTL − 129.0, respectively. Overall, this study advances our understanding of the acoustic properties of J. annandalei, potentially aiding in future acoustic monitoring, particularly for identifying the cause of similar mass mortality events.

{"title":"Acoustic characteristics of Jesogammarus annandalei in Lake Biwa","authors":"Naizheng Yan , Tohru Mukai , Kouichi Sawada , Kohei Hashimoto , Kanako Ishikawa","doi":"10.1016/j.seares.2025.102566","DOIUrl":"10.1016/j.seares.2025.102566","url":null,"abstract":"<div><div>Mass mortality of <em>Jesogammarus annandalei</em>, an amphipod species endemic in Lake Biwa, has been recently observed. <em>J. annandalei</em> is useful in fisheries; therefore, analyzing its occurrence is important for conserving the species and maintaining biodiversity. The acoustic method can be used in monitoring the distribution and abundance of <em>J. annandalei</em>. Therefore, along with measuring total body length (TL), we measured the acoustic factor target strength (TS), density contrast <em>g</em>, and sound speed contrast <em>h</em> necessary for the application of the theoretical model (distorted-wave Born approximation model) of <em>J. annandalei</em>. The results indicated <em>g</em> = 1.0725 and <em>h</em> = 1.003, and the measured TS values agreed well with the estimated ones. The relationships between the average TS and TL at 38, 120, and 200 kHz were <em>TS</em> = 60.4log<em>TL</em> − 165.6; <em>TS</em> = 53.4log<em>TL</em> − 141.4; and <em>TS</em> = 46.5log<em>TL</em> − 129.0, respectively. Overall, this study advances our understanding of the acoustic properties of <em>J. annandalei</em>, potentially aiding in future acoustic monitoring, particularly for identifying the cause of similar mass mortality events.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"204 ","pages":"Article 102566"},"PeriodicalIF":2.1,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143173531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling the diffusion of 226Ra in the calm marine environment of Gorgan Bay and validating it using experimental results

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-01-12 DOI: 10.1016/j.seares.2025.102564

Reza Pourimani, Seyed Mohsen Mortazavi Shahroudi

The awareness of emission pattern of radionuclides is necessary for the assessment of their impact on people's health. In this paper, the distribution of ²²⁶Ra in the Gorgan Bay water body was investigated. This experience could help scientists predict the distribution of ²²⁶Ra in the aquatic environment. Two models predicted the distribution of ²²⁶Ra in the sediments at various points along the Gaz River estuary to Gorgan Bay. These predictions were then compared with actual measurements of ²²⁶Ra activity taken at the same locations. Model 1 is based on the framework proposed by the International Atomic Energy Agency, while Model 2 is a concentric model developed by the authors. Model2 can be used for the wastewater pools of nuclear centers and can predict well how radium spreads in a quiet environment without interference. The average specific activity of ²²⁶Ra in sediments for experimental data, Model1 and Model2 was 14.75, 14.99 and 15.24 Bq/kg, respectively. The mean value of relative error for Model1 and Model2 was %7.18 and %3.29, respectively. The ²²⁶Ra diffusion patterns using models 1 and 2 at the study area are very near to the obtained results. According to these models and measurement results, the concentration of ²²⁶Ra is highest in deposits near the Gaz River's mouth, and its amount decreases with distance from its mouth. The good prediction of ²²⁶Ra concentration in sediments by these models shows that it can be used in other non-turbulent environments.

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引用次数: 0

Connectivity and larval drift across marine protected areas in the German bight, North Sea: Necessity of stepping stones

IF 2.1 4区地球科学 Q2 MARINE & FRESHWATER BIOLOGY

Journal of Sea Research

Pub Date : 2025-01-08 DOI: 10.1016/j.seares.2025.102563

Vera Sidorenko , Sara Rubinetti , Anna Akimova , Bernadette Pogoda , Alexey Androsov , Kingsly C. Beng , Anne F. Sell , Santiago E.A. Pineda-Metz , K. Mathias Wegner , Sarah C. Brand , Lisa N.S. Shama , Jochen Wollschläger , Kerstin Klemm , Amin Rahdarian , Christian Winter , Thomas Badewien , Ivan Kuznetsov , Gerald Herrling , Silke Laakmann , Karen H. Wiltshire

This study investigated the transport of European flat oyster (Ostrea edulis) larvae between two Marine Protected Areas in the North Sea: Borkum Reef Ground (BRG), where oysters were recently reintroduced, and Sylt Outer Reef (SOR). Additionally, we determined the source of oyster genetic material collected during cruises in 2022 between BRG and SOR. To achieve these goals, numerical simulations focusing on surface and depth-averaged water mass transport were conducted using the FESOM-C coastal ocean model with a forward/backward Lagrangian module. Surface drifter data were also analysed to examine surface transport and validate the model output. Our results indicate that typical summer wind conditions, along with tidal residual currents, support the transport of water masses and passive tracers from BRG to SOR. Surface water masses from BRG generally approach SOR from the south and west. However, BRG and SOR are usually connected over periods exceeding two weeks, even considering the fastest surface currents. Strong and persistent south-westerly winds, which are uncommon in summer, can accelerate this connection to under two weeks. Conversely, strong and persistent easterly or south-easterly winds, also rare in summer, can prevent some passive tracers originating from BRG from ever reaching SOR or the eastern North Sea. In the case of depth-averaged transport, significantly more time is required, with a minimum duration of eleven weeks to connect the domains. This connection could be facilitated by an intermediary habitat - as a stepping stone in the transition zone, if that provides suitable habitat for settlement and subsequent larval production.

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引用次数: 0