Journal of Sea Research最新文献

{"title":"Macrozooplankton diversity and distribution off South Orkney Islands","authors":"Torborg E. Rustand ,&nbsp;Astrid F. Rasmussen ,&nbsp;Ludvig A. Krag ,&nbsp;Anne Gro Vea Salvanes ,&nbsp;Bjørn A. Krafft","doi":"10.1016/j.seares.2025.102598","DOIUrl":"10.1016/j.seares.2025.102598","url":null,"abstract":"<div><div>Zooplankton organisms are considered ecological bio-indicators used to monitor the sustainability and health of marine ecosystems. Climate monitoring shows that the western part of the Atlantic sector of the Southern Ocean is undergoing warming over the second half of the twentieth century. This study describes the macrozooplankton composition in the upper 200 m water column of the South Orkney Islands shelf, slope, and offshore areas during the austral summer of February 2016. In total, 24 taxa were identified (15 determined to species level) from 22 sampling stations. The dominating species in catch weight were <em>Euphausia superba</em> (43.4 %) and <em>Salpa thompsoni</em> (42.7 %). Lower species diversity was associated with the offshore stations while higher species diversity was found on the shelf and slope areas. Spatial distribution of biota was examined in relation to temperature, salinity, bathymetry, and surface chlorophyll <em>a</em> using a non-metric multidimensional scaling (NMDS) analysis. A hierarchical clustering revealed five distinct groups: two dominated by <em>S. thompsoni</em>, linked to offshore waters, two groups with mixed characteristics, greater diversity and located over the shelf and slope, and a group dominated by <em>E. superba</em>. This study establishes a baseline for long-term monitoring of macrozooplankton at the South Orkney Islands, aiding future assessments of species composition and distribution in response to environmental change.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"206 ","pages":"Article 102598"},"PeriodicalIF":2.1,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface swarms of the lanternfish Myctophum punctatum associated to dolphin presence","authors":"M.P. Olivar ,&nbsp;C. López-Pérez ,&nbsp;A. Sabatés ,&nbsp;A.N. Sarmiento-Lezcano","doi":"10.1016/j.seares.2025.102597","DOIUrl":"10.1016/j.seares.2025.102597","url":null,"abstract":"<div><div>The neustonic layer of the ocean are visited at night time by a large number of organisms for feeding or breeding. This study reports large aggregations of the myctophid <em>Myctophum punctatum</em> at night in the strictly sea surface layer of the water column and the co-occurrence of dolphins swimming and probably feeding on these fish. The study was based on fish captures obtained from neuston hauls and dolphins observations in the Alboran Sea (western Mediterranean), and in oceanic waters off Lisboa (temperate Atlantic). Data on the abundance, biomass, size frequency distributions and Gonadosomatic Index of <em>M. punctatum</em> were analysed, and the relevance of these high aggregations both for the biology of the species and as a source of prey for the co-occurring dolphins is discussed.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"206 ","pages":"Article 102597"},"PeriodicalIF":2.1,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144291684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Baseline zinc levels and monitoring implications in sediments of the Changhua offshore wind farm region","authors":"Pei-Hsuan Wu ,&nbsp;Yen-Kung Hsieh ,&nbsp;Wei-Shan Chou ,&nbsp;Ping Chen ,&nbsp;Jin-Li Yu ,&nbsp;Chao-Kai Kang","doi":"10.1016/j.seares.2025.102596","DOIUrl":"10.1016/j.seares.2025.102596","url":null,"abstract":"<div><div>This study integrates data on the content of zinc (Zn) in the sediment during the construction of wind farms in the Changhua coastal area, and conducted two seasons of sediment surveys surrounding the Changhua offshore wind farms (OWFs). The survey results were compared with historical data from previous monitoring efforts in the Changhua offshore wind farm region. From 6 environmental impact assessments of Changhua OWFs, sedimentary Zn contents were below the effects range-median (ERM; 410 mg/kg) of the US National Oceanic and Atmospheric Administration (NOAA) standards. Our results showed that the Zn concentration in the sediment of the two sampling stations in this study was lower than the effect range low (ERL; 150 mg/kg) threshold. Compared among the sediments of CH-1 and CH-2 sites and other OWFs, the Zn concentrations were significantly lower than those of the Zhong Neng offshore wind farm, Zhang Fang offshore wind farm, and Haixia I/II offshore wind farm. In the spatial background, the distribution of Zn concentration in the southern area along the Changhua coastal sediments was higher than that in the northern area. The Mann-Kendall trend test analysis indicated a decreasing trend in the time series. Results of Geo-accumulation index (I _geo) and potential ecological risk (PERI) demonstrated that the sediment has low ecological potential risk. This study established baseline data on Zn concentrations in the sediment of the Changhua coastal area. The proposed alert value for Zn concentration in the Changhua coastal area environment monitoring in sediment is 83.6 mg/kg.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"206 ","pages":"Article 102596"},"PeriodicalIF":2.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From behind bars to freedom: understanding the size selection of fish sorting grids","authors":"Nadine Jacques ,&nbsp;Bent Herrmann ,&nbsp;Manu Sistiaga ,&nbsp;Jesse Brinkhof","doi":"10.1016/j.seares.2025.102595","DOIUrl":"10.1016/j.seares.2025.102595","url":null,"abstract":"<div><div>Rigid sorting grids are used in demersal trawl fisheries globally. However, in some fisheries, such as the Barents Sea demersal trawl fishery, they have been found to release large quantities of target-sized catch while simultaneously retaining too many undersized fish. Several studies have documented this issue but an in-depth understanding regarding the exact reasons for these results is still lacking. Thus, the present study investigated whether so-called fall-through experiments conducted in the laboratory for cod (<em>Gadus morhua</em>), haddock (<em>Melanogrammus aeglefinus</em>) and redfish (<em>Sebastes</em> spp.) could shed light on this matter. Predictive models based on these results, enabled a more detailed understanding of the size selection pattern from fishing trials for these species. The models revealed that the unintended release of target-sized cod and haddock occurs because a significant fraction of the fish entering the trawl squeezes themselves between the sorting grid bars to escape. For redfish, approximately 85 % of the contribution on the selectivity curve could be attributed to redfish squeezing themselves through the grid bar spacings to escape compared to when we considered that they do not squeeze (approximately 15 %). The unintended retention of undersized cod and haddock could be explained by the fact that many fish made contact with the grid with a suboptimal body orientation. The method applied enabled us to gain detailed insight into the interaction between fish and sorting grids and could potentially be applied to gain an understanding of the performance of other selectivity devices used in trawl fisheries.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102595"},"PeriodicalIF":2.1,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accelerated land loss and nuisance flooding potential in the Barataria Basin: The impacts of land subsidence, sea-level rise, and tidal dynamics","authors":"Byungho Kang ,&nbsp;Surui Xie","doi":"10.1016/j.seares.2025.102594","DOIUrl":"10.1016/j.seares.2025.102594","url":null,"abstract":"<div><div>The Barataria Basin, an ecologically and economically important microtidal interdistributary basin in Louisiana, is experiencing rapid land subsidence and increased coastal inundation.</div><div>This study quantifies the combined effects of land subsidence, sea-level rise (SLR), and evolving tidal dynamics within this vulnerable basin. Our analysis reveals a significantly amplifed tides throughout the region, further exacerbating the impacts of subsidence and SLR.</div><div>By 2045, the land area predicted to remain above Mean Higher High Water (MHHW) may decrease to approximately 65 % of the area remaining above Mean Sea Level (MSL), indicating that these low-lying regions will likely experience more frequent high-tide inundation events. This escalating flood risk poses a major threat to the Basin's sustainability, emphasizing the importance of integrating tidal dynamics into the adaptive management plans for restoration projects such as the Mid-Barataria Sediment Diversion (MBSD). The research establishes a benchmark for evaluating the relative contributions of different drivers to coastal change and highlights the growing influence of tidal inundation. These findings offer essential insights to guide management strategies in similarly vulnerable coastal regions worldwide.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102594"},"PeriodicalIF":2.1,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional thermohaline reconstruction of mesoscale eddies under remote sensing observation: From the perspective of deep learning of layer depth sequences with fusion of physical mechanisms","authors":"Lei Zhang ,&nbsp;Xiaodong Ma ,&nbsp;Xiang Wan ,&nbsp;Weishuai Xu ,&nbsp;Xiaoqing Sun ,&nbsp;Maolin Li","doi":"10.1016/j.seares.2025.102593","DOIUrl":"10.1016/j.seares.2025.102593","url":null,"abstract":"<div><div>Mesoscale eddies significantly impact the thermohaline structure of the ocean on a global scale. However, current three-dimensional reconstruction techniques for mesoscale eddies, based on multi-source data fusion, tend to focus on the profile while neglecting the depiction of mesoscale eddies in higher dimensions through three-dimensional structures. To address this issue, we first propose a hybrid recognition algorithm for mesoscale eddies. We then extract the dataset based on the recognition results and ocean reanalysis, transforming the mesoscale eddies reconstruction problem into a prediction problem of layer depth sequences, and implement the model construction using deep learning technology. Simultaneously, we incorporate the globally uniform vertical and horizontal structure of mesoscale eddies into the model input module as a binding physical mechanism and add an attention mechanism to enhance the model's output. Experiments demonstrate that the model developed in this paper performs comparably to the base model in deep learning metrics, exhibits specific advantages in measuring the three-dimensional structure of mesoscale eddies from multiple perspectives, and shows robust generalization across different oceanic regions and data sources. Inspired by the work of many researchers, this paper achieves promising results in the three-dimensional reconstruction of mesoscale eddies, offering valuable insights for deep learning research in marine data-related fields.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102593"},"PeriodicalIF":2.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The spatiotemporal dynamics of reef benthic communities in local marine protected areas: A case study of Vamizi Island","authors":"Bibiana Américo Fernando Nassongole ,&nbsp;Lene Buhl-Mortensen ,&nbsp;Ana Hilário ,&nbsp;Victor Quintino ,&nbsp;Isabel Marques da Silva","doi":"10.1016/j.seares.2025.102591","DOIUrl":"10.1016/j.seares.2025.102591","url":null,"abstract":"<div><div>Research on coral reef ecosystems highlights ongoing degradation driven by local and global factors, leading to biodiversity loss and a shift from hard coral to macroalgae communities. However, other reef components, such as soft corals, receive less attention. This study examines the temporal dynamics of benthic communities and the impact of fisheries closures on sessile reef organisms after a protected area was established. We aimed to assess benthic community changes, particularly a potential shift toward soft corals, before and after protection. Photo-quadrat transects were conducted at four sites, two inside and two outside the protected area, with surveys in 2006, 2012, 2014, and 2022 by SCUBA divers. Results showed no statistically significant differences between protected and unprotected areas but revealed site-specific fluctuations over time. Protection did not significantly alter the overall benthic composition, likely due to initial site heterogeneity and the limited timeframe for detecting changes. The lack of a shift from hard to soft corals outside of the protected area suggests nutrient availability may influence coral dynamics more than overfishing. Alternatively, unprotected sites may have avoided degradation due to increased public awareness and local conservation efforts. These findings emphasize the need for long-term monitoring to evaluate the effectiveness of implementing protected areas and inform conservation strategies for reef ecosystems.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102591"},"PeriodicalIF":2.1,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution mechanism of Ocypodoidea in intertidal zone of north shore of Hangzhou Bay (Crustacea: Decapoda: Brachyura)","authors":"Chongfeng Liu ,&nbsp;Lin Yuan ,&nbsp;Jianliang Yao ,&nbsp;Huixian Wu ,&nbsp;Junzeng Xue","doi":"10.1016/j.seares.2025.102592","DOIUrl":"10.1016/j.seares.2025.102592","url":null,"abstract":"<div><div>The protection of estuarine intertidal zones is a global hotspot issue. Ocypodoidea crabs are key components of intertidal ecosystems. Understanding the driving mechanisms behind the distribution of Ocypodoidea crabs is of great significance for intertidal conservation. The study, which combined an intertidal zone survey with laboratory salinity selection experiments, investigated the distribution of Ocypodoidea and the environmental factors driving their distribution along the north shore of Hangzhou Bay. The results indicate that we collected a total of 6 Ocypodoidea species, among which <em>Uca arcuata</em>, <em>Macrophthalmus abbreviatus</em>, <em>Macrophthalmus banzai</em>, and <em>Ilyoplax deschampsi</em> were dominant. Under natural conditions, from the bay head to the bay mouth, the four Ocypodoidea crab species transition from freshwater-adapted species (<em>I. deschampsi</em>) to saltwater-adapted species (<em>U. arcuata</em>, <em>M. abbreviatus</em>, <em>M. banzai</em>) along the increasing salinity gradient. Laboratory experiments demonstrated that salinity had an indirect influence on the distribution of <em>I. deschampsi</em> possibly mediated by biological competition. These crabs prefer distinct substrate types (divided into vegetated salt marsh, bare muddy flats and bare sandy flats). <em>Macrophthalmus banzai and M. abbreviatus</em> inhabit bare muddy and sandy flats. <em>Ilyoplax deschampsi</em> adapts to both. <em>Uca arcuata</em> inhabits vegetated salt marsh together with those two flats. Differences in crab substrate preferences and the presence or absence of these substrate types across different sections further drive compositional differences in the Ocypodoidea community. Human activities have altered the distribution patterns of salinity and the aforementioned substrate types along the north shore of Hangzhou Bay, likely driving shifts in the spatial distribution of Ocypodoidea crabs.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102592"},"PeriodicalIF":2.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generating ecologically relevant oxygen fluctuations using marine primary producers under laboratory conditions","authors":"Aníbal Sánchez ,&nbsp;Paula Celis-Plá ,&nbsp;Marco Fusi ,&nbsp;Lucas Bravo-Guzmán ,&nbsp;Simone Baldanzi","doi":"10.1016/j.seares.2025.102590","DOIUrl":"10.1016/j.seares.2025.102590","url":null,"abstract":"<div><div>Incorporating near-natural variation of marine environmental variables into experimental designs is becoming imperative to make ecologically relevant inferences about ecophysiological responses to climate global change. Dissolved Oxygen (DO) is among the most important environmental variable in marine ecosystems and fluctuates strongly in coastal habitats, due to physical and biological phenomena. However, many technical challenges are still imposing high-cost equipment to ensure a complete mimicry of DO fluctuations in manipulative experiments. Here, we propose a simple and cost-effective methodology to simulate the oxygen fluctuations in the laboratory through to marine primary producers as source of natural fluctuations. We tested the physiological status (Yield II and <em>F</em>_<em>v</em><em>/fm</em>) as a proxy of oxygen evolution, and photoprotective responses (phenolic production), as metabolic stress indicator in five different biomasses (200–400–600-800-1000 g; that correspond to 6–12–18-24-30 g l⁻¹, respectively) of the macroalgae <em>Lessonia spicata</em> exposed to 7 days of artificial light (photoperiod of 12:12 h day: night) within replicated aquaria. We showed that each biomass exhibited a unique fully functional oxygen fluctuating profile with different average DO saturations, harmonic oscillations and rates of DO production/consumption. Biomasses &lt;600 g showed no significant changes in the physiological status of macroalgae (Yield II and <em>F</em>_<em>v</em><em>/fm</em>) and photoprotective responses (phenolic production) during the 7 days experiment, while effects of the environmental stress were found at greater biomasses (800 and 1000 g). We successfully tested a method that can produce daily cycles of DO fluctuations in seawater trough to marine primary producers under controlled environment conditions. Our quantitative method provides cost-effective control the DO fluctuations in experimental set-ups with the use of a primary producers that can be replicated at low cost in virtually any laboratory worldwide using other species of marine algae, representing a highly effective method to control experimental settings that involve testing of fluctuating and ecologically relevant levels of dissolved oxygen.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102590"},"PeriodicalIF":2.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accelerated Ocean thermal expansion and its contribution to Global Sea-level rise","authors":"Ting-Yu Liang ,&nbsp;Shih-Chun Hsiao ,&nbsp;Han-Lun Wu ,&nbsp;Hongey Chen ,&nbsp;Wei-Bo Chen","doi":"10.1016/j.seares.2025.102589","DOIUrl":"10.1016/j.seares.2025.102589","url":null,"abstract":"<div><div>Global ocean heat content (GOHC) changes are crucial to understanding climate change, as oceans store about 91 % of the excess heat in the climate system. The thermal expansion of oceans significantly contributed to sea level rise in the twentieth century and will likely remain a major factor in the twenty-first century. This study analyzed decades of data from global ocean reanalysis and satellites, revealing that from 2014 to 2023, the annual rates of increase in GOHC and global mean sea level (GMSL) were 45.2 ± 1.78 MJ/m² and 4.7 ± 0.23 mm, respectively. These rates are 1.7 and 1.8 times higher than those of the previous four decades. Thermal expansion alone accounts for 56 % of the total GMSL rise. A 1 °C increase in global ocean temperature would result in a 0.89-m rise in GMSL due solely to thermal expansion. GOHC variations align with GMSL changes monthly, though a three-month delay is observed in regions such as Southwest China, the Indochinese Peninsula, and the coastal Middle East. Significant increases in both GOHC and GMSL are most evident in the 20°N–40°N and 20°S–40°S regions. Since the late 1980s, greenhouse gas emissions have overtaken solar radiation as the primary driver of ocean temperature increases. Since the 1990s, the Earth's energy imbalance (EEI) has remained positive, with an annual increase of 0.03 ± 0.016 W/m², indicating excess heat accumulation.</div></div>","PeriodicalId":50056,"journal":{"name":"Journal of Sea Research","volume":"205 ","pages":"Article 102589"},"PeriodicalIF":2.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}