Progress in Oceanography最新文献

{"title":"Response of zooplankton to unusual increase in temperature and sea ice melting in a changing environment (Prydz Bay), coastal Antarctica: Climate change perspective","authors":"V. Venkataramana,&nbsp;R.K. Mishra,&nbsp;Melena A. Soares,&nbsp;P. Sabu,&nbsp;Alvarinho J. Luis,&nbsp;A. Sarkar,&nbsp;T. Jabir,&nbsp;A.Srinivas Rao,&nbsp;Rahul Mohan","doi":"10.1016/j.pocean.2026.103684","DOIUrl":"10.1016/j.pocean.2026.103684","url":null,"abstract":"<div><div>Polar regions are particularly sensitive to even small increases in temperature. Eastern Antarctic coastal waters may therefore be especially vulnerable to warming, posing an increased risk to planktonic communities. Despite this vulnerability, zooplankton studies in the coastal waters of Eastern Antarctica (Indian Ocean sector) have received comparatively less scientific attention than those in West Antarctica, particularly with respect to understanding the impacts of ongoing climate change on zooplankton. To address this information gap, we investigated zooplankton biovolume, community composition, and vertical distribution in relation to hydrographic parameters in the coastal waters of Antarctica during the sea-ice melting season (January and February) of 2017. The sea surface temperature conditions observed in the neritic zone were highly unusual and, to our knowledge, had not been reported previously. In the seasonal ice zone, freshening of surface waters likely constrained the biomass of both phytoplankton and zooplankton. Conversely, the elevated zooplankton biovolume recorded in the neritic and ice free zones was likely associated with higher chlorophyll-a concentrations compared to those in the seasonal ice zone. <em>Calanus simillimus</em> and <em>Calanus australis</em> are key taxa in the oceanic domain, whereas <em>Stephos longipes</em> and <em>Paralabidocera antarctica</em> serve as indicator species of the continental shelf region, where their occurrence is closely associated with floating sea ice. We hypothesized that the combined influence regional factors including sea surface temperature, food availability, sea ice extent, ongoing sea ice decline, and surface freshening would exert the strongest control on zooplankton abundance and species diversity in the coastal waters of East Antarctica. As a result, such environmental changes are expected to substantially affect biogeochemical process in coastal Antarctic ecosystem.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103684"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146048045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrating morphology and molecular data: Two new deep-sea species of Beksitanais and Mystriocentrus from North Pacific (Crustacea, Tanaidacea)","authors":"Jakiel Aleksandra, Błażewicz Magdalena","doi":"10.1016/j.pocean.2026.103686","DOIUrl":"https://doi.org/10.1016/j.pocean.2026.103686","url":null,"abstract":"Two new deep-sea species of Pseudotanaidae are described from the North Pacific: Beksitanais seaodditys sp. nov. from the Bering Sea and Mystriocentrus bieguni sp. nov. from the Sea of Okhotsk, collected during the AleutBio and SokhoBio expeditions. Morphological examination combined with COI and 18S data reveals both congruence and conflict between datasets. The new species extend the currently known diversity of Beksitanais and Mystriocentrus and show that several characters previously regarded as diagnostic, such as the thick rod seta on the maxilliped palp and palm folds on the cheliped, are evolutionarily uninformative. Mystriocentrus bieguni lacks the thick seta on palp article-4, while B. seaodditys exhibits palm folds, indicating possible homoplasy. Phylogenetic results reveal high morphological–molecular complexity within Pseudotanaidae, providing new insights into the delimitation and evolutionary relationships of its deep-sea genera. These findings underscore the value of integrative taxonomy for advancing our understanding of tanaidacean diversity in the deep ocean.","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"178 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146048055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Opposite latitudinal biodiversity gradient in the open ocean generated by transition Zones: Insights from fish distribution in the Northwest Pacific","authors":"Yuan Lin, Zeshu Yu, Sk Istiaque Ahmed, Xueding Wang, Tomihiko Higuchi, Itsuka Yabe, Marty Kwok-Shing Wong, Sachihiko Itoh, Eisuke Tsutsumi, Hiroaki Saito, Kosei Komatsu, Atsushi Tsuda, Yusuke Kawaguchi, Eitarou Oka, Hajime Obata, Yuki Minegishi, Hideki Fukuda, Jun Inoue, Susumu Hyodo, Shin-ichi Ito","doi":"10.1016/j.pocean.2026.103685","DOIUrl":"https://doi.org/10.1016/j.pocean.2026.103685","url":null,"abstract":"","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"88 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrative taxonomy of Mesosignidae Schultz, 1969 (Crustacea, Malacostraca) from North Pacific trenches: new species description and biogeographic insights from morphology, mtDNA, and proteomics","authors":"Andreas Kelch ,&nbsp;Laura Spies ,&nbsp;Davide Di Franco ,&nbsp;Maria A. Nilsson ,&nbsp;Sven Rossel ,&nbsp;Pedro Martinez Arbizu ,&nbsp;Anja Rauh ,&nbsp;Heiko Stuckas ,&nbsp;Stefanie Kaiser ,&nbsp;Angelika Brandt","doi":"10.1016/j.pocean.2026.103682","DOIUrl":"10.1016/j.pocean.2026.103682","url":null,"abstract":"<div><div>Submarine deep-sea topography − comprising trenches, ridges, and abyssal plains − functions as a semi-permeable barrier to dispersal. Brooding isopods represent an ideal model for investigating how such features shape species divergence. Here, we applied an integrative framework − combining detailed morphological analyses, a mitochondrial marker (COI), and proteomic fingerprinting using MALDI-TOF MS − to delimit species and elucidate phylogeographic patterns in the deep-sea isopod family Mesosignidae Schulz, 1969 across the Aleutian Trench (AT) and the Kuril-Kamchatka Trench (KKT). Initial attempts to amplify COI with universal primers consistently failed; in response, we designed and validated <em>Kurilosignum</em>-specific primers, achieving ∼ 81 % sequencing success and markedly expanding our genetic dataset. Proteomic profiles corroborated the molecular species clusters, validating this first application of proteomic fingerprinting in Mesosignidae. Molecular analyses revealed four cryptic species within the material morphologically identified as <em>Kurilosignum</em> sp., three confined to the AT and one to the KKT. Patterns of haplotype sharing of one <em>Kurilosignum</em> lineage across abyssal sites north and south of the AT indicate recent gene flow, while abyssal and hadal populations suggest limited vertical connectivity with a divergence of 4.5 %. The AT seems to act as a semi-permeable barrier: <em>Kurilosignum</em> species traverse abyssal plains, whereas species of <em>Japanosignum</em> remains restricted to the southern slope of the AT; however, the small sample size requires additional collections for confirmation. In addition, we formally describe <em>Kurilosignum cardui</em> Kelch &amp; Spies sp. nov. − the second species to be described from the genus − from abyssal depths of the AT. The discovery highlights hidden diversity within a small, low-abundance taxon and demonstrates the power of an integrative framework for resolving taxonomy and biogeography in elusive deep-sea lineages.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"243 ","pages":"Article 103682"},"PeriodicalIF":3.6,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146001427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chlorophyll response and High Productivity Zone contraction in northern Perú during the 2017 Coastal El Niño","authors":"Rodrigo Mogollón ,&nbsp;Dante Espinoza-Morriberón ,&nbsp;Oswaldo Velasquez ,&nbsp;Guisela Yabar ,&nbsp;Manuel Villena ,&nbsp;Jorge Tam","doi":"10.1016/j.pocean.2026.103679","DOIUrl":"10.1016/j.pocean.2026.103679","url":null,"abstract":"<div><div>The 2017 Marine Heatwave event was characterized by significant positive sea surface temperature anomalies driven by weakened and reversed wind patterns, from mid-January to mid-April. The wind reversal during the Coastal El Niño favored downwelling processes, limiting the upward transport of nutrient-rich waters and causing a rapid collapse in surface phytoplankton biomass. Additionally, reduced latent heat flux and increased shortwave radiation further exacerbated surface warming. From February to March 2017, chlorophyll-a concentrations showed strong negative anomalies (more than −3 mg m⁻³), with the High Productive Zone (HPZ) contracting significantly, from 300 km offshore in January to nearly 25 km from the coast during this two-months period, while the total HPZ area decreased by up to 130,000 km² in March, demonstrating a sharp decline in surface chlorophyll-a concentration. However, as physical drivers tend to return to typical seasonal values by April, upwelling resumed, positive chlorophyll-a anomalies emerged indicating a relatively rapid recovery of phytoplankton biomass, and the HPZ re-expanded toward climatological levels. These findings emphasize the sensitivity of the northern Peruvian marine ecosystem to short-term climate variability. Given the increasing frequency of these climatic events, understanding the physical drivers of ecosystem changes is critical for predicting future impacts and informing adaptive management strategies.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103679"},"PeriodicalIF":3.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Resource partitioning among small pelagic fish remains stable regardless of food availability in a seasonally pulsed upwelling system","authors":"Fany Sardenne ,&nbsp;Carl D. van der Lingen ,&nbsp;Marie Vagner ,&nbsp;Yonela Geja ,&nbsp;Eleonora Puccinelli ,&nbsp;Margaux Mathieu-Resuge ,&nbsp;Fabienne Le Grand ,&nbsp;Jean-Marie Munaron ,&nbsp;Manon Buscaglia ,&nbsp;Sandrine Serre ,&nbsp;Philippe Soudant ,&nbsp;Laure Pecquerie","doi":"10.1016/j.pocean.2026.103678","DOIUrl":"10.1016/j.pocean.2026.103678","url":null,"abstract":"<div><div>Small pelagic fishes (SPF) in eastern boundary upwelling systems share space and must adapt to strong seasonal and inter-annual variations in their environment. This raises questions about how these species share food resources in a changing environment and whether they compete with each other when their food resources are reduced. We approach these questions on three SPF species (sardine <em>Sardinops sagax</em>, anchovy <em>Engraulis encrasicolus</em> and round herring <em>Etrumeus whiteheadi</em>) living on the west and south coasts of South Africa. We combined fish muscle fatty acid profiles as a proxy for prey taxa diversity, stable isotope compositions as a proxy for habitat and trophic position, and satellite-derived chlorophyll-a and zooplankton concentrations as proxies for food availability. We found that the total fatty acid content (energy reserve) of the three species increased with chlorophyll-a concentration, suggesting that chlorophyll-a is a good proxy for food quantity. For the three SPF species, the niche width increased with the amount of chlorophyll-a. However, the niche overlap (i.e. the potential for competition) remained relatively unchanged as chlorophyll-a concentrations increased, though it varied considerably depending on local conditions (from 0 to 100 %), higher on the west coast (influenced by the Benguela upwelling) than in the south coast. The relative trophic level of the species (round herring &gt; anchovy &gt; sardine) was confirmed in both regions and the round herring remained on average 25 % fattier than the other two species. These results suggest that on a relatively short time scale (month) SPF species are more selective when food levels decrease but that competition for resources may or may not operate depending on local conditions. However, integrated over a larger time scale, the three species do feed on different resources (resulting in different trophic levels) and cannot be considered an ecological substitute. The recent changes in their respective biomasses could impact the amount of fat (energy) available to higher trophic levels.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103678"},"PeriodicalIF":3.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Salinity variability in the mixed layer off Chilean Patagonia: potential influence of Patagonian ice fields","authors":"Natalia Cisternas ,&nbsp;José Garcés-Vargas ,&nbsp;Manuel I. Castillo ,&nbsp;Carmen Barrios-Guzmán ,&nbsp;Fernanda Barilari ,&nbsp;Mauricio F. Landaeta ,&nbsp;Maritza Sepúlveda ,&nbsp;Andrea Piñones","doi":"10.1016/j.pocean.2025.103653","DOIUrl":"10.1016/j.pocean.2025.103653","url":null,"abstract":"<div><div>The Chilean Patagonia, between 40°S and 56°S, hosts one of the world’s largest and most productive estuarine systems, where oceanic waters mix with freshwater from rivers, runoff, glaciers, and snowmelt, creating a complex and dynamic estuarine environment. Understanding the factors influencing salinity fluctuations in this region is key to elucidating its ecosystem complexity. This study evaluates the forcings driving salinity variability in the mixed layer of West Patagonia’s coastal zone. A salinity balance was done using GLORYS reanalysis and atmospheric variables from ERA5. Spatiotemporal variability of the salt balance terms was investigated using Hovmöller diagrams focusing on three key sites. Results showed significant seasonal and interannual variability in the mixed layer. Advective terms, particularly the zonal component, were crucial in modulating salinity. A clear annual cycle emerged in the northern sector (40–48°S). Empirical Orthogonal Function analysis identified significant interannual fluctuations, with positive atypical periods in 1997–2005 and 2010–2015, and negative periods in 2006–2008 and 2018–2020. These fluctuations were primarily linked to the dynamics of San Quintín Glacier (∼47°S), which induced anomalous salinity conditions along the coastal domain. Notably, these variations did not exhibit a direct relationship with large-scale climate modes. These findings underscore the intricate nature of salinity variability in West Patagonia’s coastal waters, driven by a complex interplay of local hydrological processes and glacial dynamics. Understanding these mechanisms is essential for anticipating future changes in this fragile and ecologically significant region.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103653"},"PeriodicalIF":3.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability of marine particulate organic matter under microbial mediation and its role in carbon sequestration","authors":"Yao Lu ,&nbsp;Huamao Yuan ,&nbsp;Jinming Song ,&nbsp;Xuegang Li ,&nbsp;Liqin Duan ,&nbsp;Qidong Wang ,&nbsp;Fengmin Pan","doi":"10.1016/j.pocean.2026.103668","DOIUrl":"10.1016/j.pocean.2026.103668","url":null,"abstract":"<div><div>The ocean annually absorbs approximately 2.9 GtC (gigatons of carbon), accounting for 26% of global CO₂ emissions, making it a critical carbon sink. In this process, bacteria attached to particulate organic carbon (POC) play a pivotal role: they transform labile phytoplankton-derived carbon into more biochemically stable bacterial carbon, ultimately forming long-term storable refractory dissolved organic carbon (RDOC) and refractory particulate organic carbon (RPOC). Thus, the “refractory transformation” of marine organic carbon is a key mechanism in forming the biological carbon pump. Currently, the inventory, proportion, and microbial roles of RDOC have been preliminarily elucidated. However, the stock, sources, microbial transformation processes, underlying mechanisms of RPOC, and its contribution to long-term carbon sequestration remain unclear. Amino acids, as essential components of POC, have emerged as novel indicators—through their content, composition, and isotopic signatures—to effectively quantify microbial degradation and transformation of POC and decipher its stability mechanisms. This review systematically synthesizes research advances on the distribution and stability of POC across size classes under microbial mediation. It highlights the potential of amino acid-based techniques and compound-specific isotope analysis (CSIA) to unravel microbial contributions to RPOC formation and long-term carbon storage. Furthermore, a preliminary framework for quantifying the role of different POC size classes in marine carbon sequestration is proposed. This work provides a scientific basis for understanding the ocean’s role in achieving the “carbon neutrality” goal and establishes a theoretical foundation for advancing knowledge of “microbe–size class–carbon sequestration” coupled mechanisms and developing ocean-based carbon sequestration technologies.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103668"},"PeriodicalIF":3.6,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dissolved organic matter (DOC, CDOM, FDOM) in the western Tropical South Pacific: Depth- and subregion-resolved variability, and hydrothermal influence","authors":"Marc Tedetti ,&nbsp;Catherine Guigue ,&nbsp;Léo Mahieu ,&nbsp;Pauline L. Martinot ,&nbsp;Mar Benavides ,&nbsp;Cécile Dupouy ,&nbsp;Sandra Nunige ,&nbsp;Elvira Pulido-Villena ,&nbsp;Céline Dimier ,&nbsp;Chloé Tilliette ,&nbsp;Sophie Bonnet ,&nbsp;Cécile Guieu ,&nbsp;Dominique Lefèvre","doi":"10.1016/j.pocean.2025.103664","DOIUrl":"10.1016/j.pocean.2025.103664","url":null,"abstract":"<div><div>The Western Tropical South Pacific has recently been identified as a global hotspot for microbial dinitrogen fixation and shallow hydrothermal activity, yet the dynamics of dissolved organic matter (DOM) in this ecosystem remains understudied. During the TONGA cruise (2019), we investigated the distribution of dissolved organic carbon (DOC), chromophoric DOM (CDOM) and fluorescent DOM (FDOM) from Melanesian waters to the South Pacific Gyre, including the Lau Basin/Tonga-Kermadec Volcanic Arc. DOC concentration, CDOM absorption [a_CDOM(254)], the CDOM spectral slope (S_275-295) and tyrosine-like fluorescence decreased from surface to deep waters across subregions. In contrast, apparent oxygen utilization (AOU), nutrients, a_CDOM(350), specific UV absorbance (SUVA₂₅₄), humic-like fluorescence, humification (HIX) and combustion (COX) indices increased with depth. These distributions reveal 1) the production of labile, low molecular weight DOM by phytoplankton, and photobleaching in the photic layer, and 2) the production of higher molecular weight, bio-refractory DOM from the remineralization of sinking particulate organic carbon and DOC in deeper waters. Also, the tryptophan-like fluorescence peaks at depth could be associated with the presence of sinking <em>Trichodesmium</em> spp. Regional variations in DOM characteristics were less pronounced than water-mass-related differences but revealed subtle trends along the west-east gradient, with overall higher DOC, CDOM and FDOM levels in the Melanesian and Lau Basin/Arc subregions compared to the South Pacific Gyre. At 200-m depth near the Arc, the release of hydrothermal fluids altered the DOM composition close to the vent, with significant increases in a_CDOM(254) and tyrosine-like material, and significant decreases in HIX and COX indices. We further show an indirect, large-scale impact of shallow hydrothermal vents on the DOM stock in the 0–50-m surface layer, driven by the iron fertilization-induced stimulation of planktonic activity in the photic zone. The increased DOM stocks were observed mostly in the Lau Basin/Arc subregion but extending to Melanesian waters and the western edge of South Pacific Gyre. Collectively, these processes shape the optical properties and biogeochemical behavior of DOM, highlighting the importance of hydrothermal systems in the oceanic carbon cycle.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103664"},"PeriodicalIF":3.6,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145979188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential impact of seamount on the mild oxygen minimum zone (OMZ) in the Western Pacific","authors":"Jun Ma ,&nbsp;Lilian Wen ,&nbsp;Xuegang Li ,&nbsp;Kuidong Xu ,&nbsp;Jiajia Dai ,&nbsp;Yi Sun ,&nbsp;Guorong Zhong ,&nbsp;Detong Tian ,&nbsp;Huamao Yuan ,&nbsp;Liqin Duan ,&nbsp;Jinming Song","doi":"10.1016/j.pocean.2025.103666","DOIUrl":"10.1016/j.pocean.2025.103666","url":null,"abstract":"<div><div>Seamount and the oxygen minimum zone (OMZ) are often two typical habitats coexisting in the deep sea, and studying the relationship between the “seamount effect” and OMZ is of great significance to improve the cognitive level of the two typical deep-sea habitats. Based on the investigation of the two cruises in the M4 seamount of the Western Pacific, this study revealed the “seamount effect”, explored the impact of seamount and environmental parameters on OMZ. The results showed that the uplifts of the isohaline, isotherm and isopycnal occurred near the summit in the two cruises, and the isolines of NO₃-N, PO₄-P and NO₂-N were also elevated near the summit. Meanwhile, the ratio of the average concentration of POC near the summit for cruise 1 to cruise 2 can reach up to about 2 times. This may indicate that there was a “seamount effect” in both cruises, and it was stronger in cruise 1. The range and intensity of OMZ in both cruises were similar, with the range of 550–1100 m and (330–380, 850–1100) m, respectively. The impact of seamount on OMZ may be reflected in two aspects. One possible mechanism was that the hydrological phenomena such as upwelling near the summit may raise the isolines of low concentration DO in 200–300 m, increasing the range of the upper boundary of OMZ; Another possibility was that the biological activities of seamount sediments continuously may consume DO, such as in 1000 m at station A7 of cruise 1, increasing the intensity of OMZ. In addition, the temperature below 1000 m directly controlled the upper boundary of OMZ, while the decomposition of organic matter in 75–300 m above the OMZ consumed DO, which also had an important impact on the range and intensity of the OMZ.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103666"},"PeriodicalIF":3.6,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}