Progress in Oceanography最新文献

{"title":"Interannual variability and depth-dependence in pathways of Iceland–Scotland Overflow Waters exiting the Iceland Basin","authors":"Ali Johnson Exley ,&nbsp;Amy Bower ,&nbsp;Xiaobiao Xu ,&nbsp;Sijia Zou ,&nbsp;Anna Pinckney ,&nbsp;Heather Furey","doi":"10.1016/j.pocean.2025.103662","DOIUrl":"10.1016/j.pocean.2025.103662","url":null,"abstract":"<div><div>Iceland–Scotland Overflow Water (ISOW), a dense water mass formed in the Nordic Seas, spills into the Iceland Basin through the Iceland-Faroe Ridge and Faroe Shetland Channel before propagating southwestward along the eastern flank of the Reykjanes Ridge as a deep boundary current, contributing to the lower limb of the Atlantic Meridional Overturning Circulation. Recent work has demonstrated that pathways of ISOW out of the Iceland Basin are complex and variability has not been explored on interannual and longer timescales. In this study, we use the basin-scale, eddy-rich (1/12°), 40-year Atlantic Hybrid Coordinate Ocean Model (HYCOM) simulation to investigate the variability in ISOW export pathways. Simulated Lagrangian particles are released within the ISOW layer (<span><math><mrow><msub><mrow><mi>σ</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>&gt;</mo></mrow></math></span> 27.80 kg m⁻³) at two locations along the eastern flank of the Reykjanes Ridge and classified according to their export pathway: over the Reykjanes Ridge, through the Charlie Gibbs Fracture Zone (CGFZ) or into the Western European Basin (WEB). We show that export over the Reykjanes Ridge exhibits variability on timescales from 2.5 years to decadal and is strongly correlated with mid-depth northward transport into the Iceland Basin forced by fluctuations in the North Atlantic Current (NAC), suggesting a link to large-scale gyre dynamics. Export through the CGFZ is characterized by variability of 2.5–5 years and is influenced by the meridional position of the eastward-flowing NAC within the CGFZ, which can block ISOW export and divert particles into the WEB. Export pathways are shown to exhibit a significant depth-dependence such that shallower layers are more strongly impacted by the surface circulation while deeper layers are more subject to topographic steering, results that are corroborated by utilizing observations from RAFOS floats deployed during the OSNAP campaign. Together, these findings illustrate the high-degree of variability in pathways of ISOW export and contributes to the growing body of evidence that challenges the notion of a single, dominant pathway out of the Iceland Basin.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103662"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894968","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":"Evaluating the validity of using sea surface temperature as an alternative to bottom temperature in American lobster habitat suitability modeling","authors":"Xiangyan Yang ,&nbsp;Robyn Linner ,&nbsp;Cameron Hodgdon ,&nbsp;Jacob P. Kritzer ,&nbsp;George Maynard ,&nbsp;Erin Pelletier ,&nbsp;Yong Chen","doi":"10.1016/j.pocean.2026.103667","DOIUrl":"10.1016/j.pocean.2026.103667","url":null,"abstract":"<div><div>Oceanographic information is critical for understanding the capacity of a given habitat to support a certain species. Habitat Suitability Index (HSI) models are widely used to describe the relative suitability of an area by defining the relationship between key environmental variables and the species’ abundance. The Gulf of Maine (GOM) region provides essential habitat for American lobster (<em>Homarus americanus</em>) and has been identified as one of the most rapidly warming ocean ecosystems in the world. Understanding how climate change may influence American lobster habitat is imperative in planning for an uncertain future and informing the lobster industry and management. However, a lack and lag of bottom temperature (BT) data availability has impeded the development and operationalization of projected lobster suitable habitat. In this study, we first examined the ability of sea surface temperature (SST) in representing the spatiotemporal variability of BT in the GOM. We then compared the suitability index (SI) curves and HSI maps generated by each temperature dataset. Finally, we assessed the correlation level of the predicted HSI values with lobster abundance. Our study demonstrated that the SST-based model effectively captures the general spatial patterns of suitable habitats predicted by the BT-based model. However, the performance of the SST-based model when compared to the BT-based model was less consistent across seasons and between eastern and western GOM regions, which may be attributed to the seasonal stratification and nearshore physical oceanographic dynamics. The SST-based HSI model had a slightly higher correlation with observed abundance data at most depth intervals and particularly in recent fall periods. Our findings suggest that in less stratified regions, SST can serve as a reasonable alternative to BT and may even provide a more responsive indicator of warming. Leveraging data-rich SST in lobster HSI models can enhance the operationalization of habitat projections and support timely management responses under these conditions. However, in stratified regions, reliance on SST alone may underestimate suitable habitat. As ocean stratification may intensify under climate change, further evaluation of the alternative validity is warranted. The methodology and analysis framework of this study can also be applied to other species and areas where limited BT observations constrain habitat modeling and stratification is short-lived, allowing for more prompt identification of and response to climate impacts.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103667"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940800","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":"Picophytoplankton biogeography, community structure, and carbon biomass in the Eastern Indian Ocean during the spring inter-monsoon season","authors":"Garima Chaudhari ,&nbsp;Smita Mitbavkar ,&nbsp;Pranoy Paul ,&nbsp;Jagadish S. Patil ,&nbsp;Samir Damare","doi":"10.1016/j.pocean.2026.103680","DOIUrl":"10.1016/j.pocean.2026.103680","url":null,"abstract":"<div><div>Picophytoplankton are globally ubiquitous and play essential roles in marine food webs and biogeochemical cycles, yet the Eastern Indian Ocean remains comparatively understudied. To address this gap, we investigated picophytoplankton biogeography, community structure, and carbon biomass across the Bay of Bengal (BoB), Equatorial Indian Ocean (EqIO), and South Tropical Indian Ocean (STIO), spanning the 90°E Ridge (20°N − 30°S) during the spring inter-monsoon of 2021. The EqIO exhibited the warmest waters, followed by the BoB and STIO, while salinity increased progressively from the BoB to the STIO. Flow-cytometric analyses revealed a decreasing trend in picophytoplankton abundance and carbon biomass from the BoB to the STIO. <em>Synechococcus</em> populations were highest above the subsurface chlorophyll maxima layer (SCML), whereas <em>Prochlorococcus</em> and picoeukaryotes dominated within the SCML. Depth-integrated abundances and biomass of <em>Synechococcus</em> and <em>Prochlorococcus</em> were highest in the BoB, followed by the STIO and EqIO, while picoeukaryotes, though contributing the least, aligned with <em>Synechococcus</em> in the STIO. The presence of <em>Synechococcus</em> and <em>Prochlorococcus</em> in the BoB Oxygen Minimum Zone (130 m) suggests potential heterotrophic or mixotrophic capabilities. Picophytoplankton abundance and carbon biomass were elevated in the westward-flowing, nutrient-rich, stratified South Equatorial Current (Indonesian Throughflow), and lower in the reverse-flowing, deeply-mixed waters of the Equatorial Under Current. The Generalized Additive Model revealed a non-linear predictor-response relationship across the study region. The RC_bray analyses showed that the picophytoplankton community assembly across all regions was overwhelmingly governed by stochastic processes, with the majority of samples falling within the ecological drift range. The insights gained from this study provide valuable inputs for improving predictive models of microbial responses to environmental variability and for refining biomass estimations in the Eastern Indian Ocean.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103680"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995699","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":"2026-02-01","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":"A new species of Austroniscus Vanhöffen, 1914 (Isopoda, Asellota, Nannoniscidae Hansen, 1914) from abyssal depths of the Aleutian Trench, north-eastern Pacific","authors":"Derya Akdogan ,&nbsp;Angelika Brandt ,&nbsp;Stefanie Kaiser","doi":"10.1016/j.pocean.2026.103683","DOIUrl":"10.1016/j.pocean.2026.103683","url":null,"abstract":"<div><div>Deep-sea expeditions play a crucial role in expanding our understanding of remote environments through the discovery of new species. However, to fully harness the potential of these discoveries for biodiversity and biogeographical assessments, as well as conservation efforts, it is essential to ensure that these species are properly described and named. During the recent AleutBio expedition (SO293) aboard RV Sonne to the Aleutian Trench (NE Pacific) in boreal summer 2022, a new species was found within the genus <em>Austroniscus</em> Vanhöffen, 1914. Morphological examination employing traditional light microscopy and Confocal Laser Scanning Microscopy confirmed the assignment of this species as new to science, <em>Austroniscus ewa</em> sp. nov., which is described herein. While bearing similarities to Southern Ocean species <em>A. chelus</em> Kaiser &amp; Brandt, 2007 and <em>A. obscurus</em> Kaiser &amp; Brandt, 2007, <em>A. ewa</em> sp. nov. can be readily differentiated from these species by, for instance, its pereonites 2–7 being of approximately equal width. Alongside the taxonomic description of the species, the diagnosis for the genus <em>Austroniscus</em> is amended by incorporating ratios obtained from morphometric measurements of specific body parts to enhance clarity and facilitate comparison with its morphologically closest genus <em>Nannoniscoides</em> Hansen, 1916. To ease future identification of <em>Austroniscus</em> species, a dichotomic key encompassing all species within the genus is provided. The global distribution of species of <em>Austroniscus</em> is highlighted.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103683"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033593","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":"2026-02-01","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":"2026-02-01","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":"No discovery without exploration: Deep-sea sampling across the Pacific reveals three new genera of Typhlotanaidae (Crustacea: Tanaidacea)","authors":"Marta Gellert ,&nbsp;Magdalena Błażewicz ,&nbsp;Chee Kong Chim ,&nbsp;Graham J. Bird","doi":"10.1016/j.pocean.2025.103644","DOIUrl":"10.1016/j.pocean.2025.103644","url":null,"abstract":"<div><div>This study examines the “slender-bodied” representatives of the family Typhlotanaidae (Crustacea: Tanaidacea), characterized by straight pereonite margins and scale-like ornamentation on the chelipeds, collected from multiple deep-sea Pacific localities, including the Aleutian Trench, the Sea of Okhotsk, the Clarion-Clipperton Fracture Zone, and eastern Australia.</div><div>Integrative analyses combining detailed morphology and molecular data (histone H3 marker) were used to reassess the systematics of these taxa. Morphological comparisons of the family’s type species <em>Typhlotanais aequiremis</em> and related slender-bodied forms (<em>Typhlotanais plebejus</em>, species of <em>Starkus</em>, <em>Baratheonus</em>, and the “spinicauda” group) revealed a pattern of extensive homoplasy, particularly in cheliped ornamentation and pereonite morphology. These convergent traits have historically obscured true phylogenetic relationships within the group.</div><div>Genetic results, although available for a limited number of specimens, provided strong support for deep genetic divergence among several morphologically similar lineages. The molecular phylogeny recovered a well-supported monophyletic group, with new species forming a distinct, independent clade consistent with genus-level differentiation.</div><div>By integrating both data sources, this study establishes three new genera and four new deep-sea species. These taxa collectively highlight the cryptic diversity and complex evolutionary history of Typhlotanaidae. The discovery of closely related yet geographically distant species indicates possible trans-Pacific connections among deep-sea populations. An updated identification key and a review of the morphological diversity of slender-bodied Typhlotanaidae are also provided, contributing to the ongoing redefinition of generic boundaries within this morphologically challenging family.</div><div>LSIDurn:lsid:zoobank.org:pub:037D9EC3-1945–4082-971B-EB4FBB5ABE21.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103644"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732110","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":"Hidden diversity in the deep North Pacific and Atlantic: New taxa and a revised subfamilial framework of Akanthophoreidae (Crustacea: Tanaidacea)","authors":"Głuchowska Kamila ,&nbsp;Błażewicz Magdalena","doi":"10.1016/j.pocean.2025.103591","DOIUrl":"10.1016/j.pocean.2025.103591","url":null,"abstract":"<div><div>Tanaidaceans of the family Akanthophoreidae are a morphologically diverse group of peracarid crustaceans inhabiting deep-sea environments. However, their true diversity and evolutionary relationships remain poorly resolved. In this study, we examine material collected from the North Pacific and Atlantic to investigate the phylogenetic structure of Akanthophoreidae using morphological data and 18S rRNA gene sequences. Our results confirm the monophyly of the family and support its subdivision into three morphologically and genetically distinct subfamilies: Akanthophoreinae <span><span>Sieg, 1986</span></span>, Chauliopleoninae subfam. nov., and Stenotanainae subfam. nov. We provide formal diagnoses for each subfamily and revise the genus <em>Stenotanais</em>, describing two new species from the North Pacific. In addition, we establish a new genus to accommodate four new species. Species of Stenotanainae were collected from depths ranging from 805 to 5740 m across the Clarion-Clipperton Zone, Kuril-Kamchatka and Aleutian Trenches, and the northwest Atlantic margin. The discovery of Stenotanainae in both the Pacific and Atlantic extends the known distribution of this group and suggests greater inter-basin connectivity than previously assumed. In total, the number of recognised species in Akanthophoreidae increases from 56 to 62, and the number of genera from ten to eleven. This study highlights the utility of integrative taxonomy in uncovering hidden deep-sea biodiversity and provides a revised phylogenetic framework for future research on the evolutionary history of Tanaidacea.</div></div>","PeriodicalId":20620,"journal":{"name":"Progress in Oceanography","volume":"242 ","pages":"Article 103591"},"PeriodicalIF":3.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145895942","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":"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}