Deep-sea Research Part Ii-topical Studies in Oceanography最新文献

{"title":"Progression of marine heat wave events over the tropical Indian Ocean and its underlying mechanisms","authors":"Diya Das ,&nbsp;Sachiko Mohanty","doi":"10.1016/j.dsr2.2024.105438","DOIUrl":"10.1016/j.dsr2.2024.105438","url":null,"abstract":"<div><div>Marine Heat Waves (MHW) are devastating extreme oceanic events that have severe and destructive effects on the marine and coastal ecosystems. In the present study, the generation and advancement of MHW events during the last four decades over the tropical Indian Ocean (IO) and its primary regulating factors are investigated. Multiple MHW events have been detected over the tropical IO in the past decade. It was found that between 2011 and 2021, the tropical Indian Ocean observed a significant increase in both the mean annual number of MHW days and the frequency of MHW occurrences. This coincided with a substantial rise in sea surface temperatures (SST) in the region during the same period. Long-running events were detected for the years 2015 over the Somali coast, 2016 over the Java-Sumatra Coast, and for 2019, and 2020 over the Seychelles Dome. Event-specific analysis revealed that a decline in wind speed was observed during the second phase of the 2015 MHW event along the Somali coast which resulted in the subsidence of upwelling, similar observations were also made around the Java-Sumatra coast. Subsequently, the role of planetary waves in the sustenance of the long-running MHW events is analysed. Positive sea level anomaly values were observed around Somali and Sumatra for 2015 and 2016, which in turn signify the presence of downwelling planetary waves. These planetary waves play an important role in oceanic surface and sub-surface warming and mixing by deepening thermocline and consequentially inhibiting the upwelling and entrainment. An analysis of the mixed layer heat budget terms over the active regions of MHW events in 2015, 2016, 2019, and 2020 shows that the primary contributor influencing these MHW events is net heat flux over the majority of the affected areas which is followed by the dominant role of vertical advection over the Somali region.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"219 ","pages":"Article 105438"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161062","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":"Biogeochemistry of the Ross Sea and its ecosystem implication","authors":"Paola Rivaro,&nbsp;Carmela Ianni","doi":"10.1016/j.dsr2.2024.105449","DOIUrl":"10.1016/j.dsr2.2024.105449","url":null,"abstract":"<div><div>The Ross Sea is one of the best-sampled Antarctic continental shelves and represents an important region for biogeochemistry with respect to the ocean circulation and the global climate regulation. It is a key site for production of Antarctic Bottom Water (AABW) and supports the largest primary productivity in the Southern Ocean. Moreover, it plays a fundamental role in the air–sea carbon dioxide (CO₂) flux, behaving as an atmospheric CO₂ sink. Some of the most important features of the main chemical variables (nutrients, iron, carbonate system variables) are summarized, considering both recent advances in our understanding and the implications of their variability for the biogeochemistry of the Ross Sea. New observations will provide an opportunity to better understand the complex interactions that regulate the biogeochemical cycles of elements in the Ross Sea and their change in the near future.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"219 ","pages":"Article 105449"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fine-scale variability in habitat selection and niche differentiation between sponges and cold-water corals on vertical walls of the Charlie-Gibbs Fracture Zone","authors":"Ana Belén Yánez-Suárez ,&nbsp;Loïc Van Audenhaege ,&nbsp;Tyler D. Eddy ,&nbsp;Katleen Robert","doi":"10.1016/j.dsr2.2024.105437","DOIUrl":"10.1016/j.dsr2.2024.105437","url":null,"abstract":"<div><div>Deep-sea vertical walls are characterized by enhanced hydrodynamics and hard substrates, making them particularly suitable habitats for suspension feeders, including vulnerable marine ecosystems (VMEs) indicator taxa, like cold-water corals (CWC) and sponges. These species enhance the complexity of the abiotic background and the retention of trophic resources increasing habitat availability for other organisms. While some areas of vertical walls present a high density of VMEs, others are mostly bare rock. However, the habitat characteristics that favor the presence of CWC and sponges within vertical walls at a fine-scale (under 1 m) are still poorly understood despite their ecological importance. Owing to technological limitations, fine-scale terrain variables (e.g., orientation, curvature, verticality, roughness, slope) have seldom been quantified in deep-sea habitats. These terrain variables can represent proxies of community structuring factors (e.g., hydrodynamics conveying food, sedimentation rates) important to understand habitat selection of VME indicator species. In this study, we investigate the fine-scale habitat selection and niche differentiation of CWC and sponges on vertical walls of the Charlie-Gibbs Fracture Zone. Structure-from-motion photogrammetry was employed to create high-resolution 3D models of three vertical walls based on remotely operated vehicle (ROV) videos (at 1060-1901 m depth). The 3D models were used to derive terrain variables at fine-scale and geotag corals and sponges. Using ecological niche factor analysis, we reveal that corals and sponges selected habitat features that significantly differ from the average habitat available. The corals and sponges studied showed large or complete niche partitioning. <em>Solenosmilia</em> sp. had total niche separation with <em>Geodia</em> spp. and globular sponges and partial separation with <em>Hertwigia</em> spp., while Scleralcyonacea showed partial niche separation with <em>Geodia</em> spp. and globular sponges. Conversely, the niches of closely related sponges were more similar. This research advances our understanding of the processes enabling species co-existence among these organisms and the factors influencing habitat preferences of VME indicator species on steep underwater landscapes.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"219 ","pages":"Article 105437"},"PeriodicalIF":2.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Contrasting trends of the ocean CO2 sink and pH in the agulhas current system and the Mozambique basin, south-western Indian ocean (1963–2023)","authors":"Nicolas Metzl ,&nbsp;Claire Lo Monaco ,&nbsp;Guillaume Barut ,&nbsp;Jean-François Ternon","doi":"10.1016/j.dsr2.2025.105459","DOIUrl":"10.1016/j.dsr2.2025.105459","url":null,"abstract":"<div><div>We describe new observations of the oceanic carbonate system in the South-Western Indian Ocean obtained in January 2021 (OISO-31 cruise) and May 2022 (RESILIENCE cruise). To evaluate the decadal trends and drivers of fugacity of CO₂ (fCO₂), air-sea CO₂ fluxes, dissolved inorganic carbon (C_T) and pH, we used available data in this region over 1963–2023 and compared the results in the Mozambique Basin and in the Agulhas region near the African coast. Over 1995–2023, we found a faster fCO₂ increase in the Mozambique basin (2.03 ± 0.07 μatm.yr⁻¹) compared to the coastal zone (1.37 ± 0.07 μatm.yr⁻¹). The temporal change of anthropogenic CO₂ concentrations estimated in subsurface enables to reconstruct the carbonate system properties since the 1960s. In the Mozambique Basin the CO₂ sink increased slightly over 1960–2022 with a maximum observed in May 2022 (−2.4 mmolC.m⁻².d⁻¹). In the coastal zone, the ocean CO₂ sink increased from near equilibrium in the 1960s to a maximum observed in May 2022 (−4.2 mmolC.m⁻².d⁻¹). In both regions, we found a decrease of pH, most pronounced in the open ocean zone (−0.020 ± 0.001.decade⁻¹ over 1995–2023). The lowest pH of 8.04 was observed in January 2021, 0.11 lower than in the 1960s. The increase of the CO₂ sink and the decrease of pH were mainly driven by anthropogenic CO₂ uptake, with about 10% due to the ocean warming.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"220 ","pages":"Article 105459"},"PeriodicalIF":2.3,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding future changes of Chlorophyll-a in the Indian Ocean using CMIP6 Earth System Model simulations","authors":"Athira K. ,&nbsp;Prasanna Kanti Ghoshal ,&nbsp;A.P. Joshi ,&nbsp;Linta Rose ,&nbsp;Kunal Chakraborty","doi":"10.1016/j.dsr2.2025.105458","DOIUrl":"10.1016/j.dsr2.2025.105458","url":null,"abstract":"<div><div>This study uses the Coupled Model Intercomparison Project phase 6 (CMIP6) Earth System Model simulated outputs and satellite-based chlorophyll-a (Chl-a) observations to understand the changes in Chl-a concentration in the recent past and its future changes in the Indian Ocean. Based on the availability of common models across the three future scenarios (SSP5-8.5, SSP2-4.5, and SSP1-2.6), we chose 11 CMIP6 models for this study. The climatology of these model-simulated historical outputs is assessed against a satellite-based Ocean Colour Climate Change Initiative-Version 5 (OC-CCI-V5) data product. The Indian Ocean (IO) is divided into four regions (Arabian Sea (AS), Bay of Bengal (BoB), Central Indian Ocean (CIO), and Southern Indian Ocean (SIO)), and the performance of each of these CMIP6 models are evaluated in each of these regions of IO. Based on the statistical analysis, GFDL-ESM4 is found to be the best-performing model across all four IO regions. However, the GFDL-ESM4 underestimates Chl-a concentration in the AS and CIO regions (<span><math><mo>&gt;</mo></math></span> 0.07 mg/m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>), whereas it overestimates Chl-a concentration in the BoB region (<span><math><mo>&lt;</mo></math></span> −0.07 mg/m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>). The GFDL-ESM4 performs relatively better in the SIO region with a less biased Chl-a concentration. Under the SSP5-8.5 scenario, the future changes of Chl-a indicate a large decrease in the Chl-a concentrations (<span><math><mo>&lt;</mo></math></span> −0.04 mg/m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span>) in the western coast of the AS, the western coast of BoB, and the southern Java coast. This large decrease in Chl-a concentration is limited to nearly 0.01 mg/m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> under the SSP1-2.6 scenario. Therefore, the implementation of extreme mitigation measures can control the reduction of surface Chl-a concentration in the IO. The analysis to understand future changes in Chl-a concentration in the mixed layer of six upwelling zones in the IO indicates a decrease in Chl-a concentration in the mixed layer by −0.06 to −0.09 mg/m<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> in all future scenarios.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"220 ","pages":"Article 105458"},"PeriodicalIF":2.3,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104382","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":"Late Holocene and recent cold-water coral calcium carbonate production in Guilvinec Canyon, Bay of Biscay, France","authors":"Evan Edinger ,&nbsp;Jean-François Bourillet ,&nbsp;Lenaïck Menot ,&nbsp;Franck Lartaud ,&nbsp;Mathilde Chemel ,&nbsp;Stephan Jorry","doi":"10.1016/j.dsr2.2024.105451","DOIUrl":"10.1016/j.dsr2.2024.105451","url":null,"abstract":"<div><div>Cold-water coral reefs and communities can be locally important calcium carbonate factories in continental shelf and slope environments, including submarine canyons. Here we present short-term and long-term estimates of coral carbonate production by colonial scleractinian coral communities in the 750–850 m depth range in Guilvinec Canyon, northern Bay of Biscay. Short-term (annual-decadal) estimates were calculated using local coral skeletal biomass, estimated as a product of coral size and abundance from ROV video surveys, a locally generated species-specific regression between coral colony size and wet weight, and published daily or annual percent growth rates for <em>Lophelia pertusa</em> and <em>Madrepora oculata</em>. A long-term (century-millennial) estimate of carbonate accretion for the same reef was derived from a piston core through the same coral community.</div><div>Average live colonial scleractinian skeletal biomass in the Guilvinec Canyon coral mounds was 153.9 ± 39.4 g CaCO₃ m⁻². Applying published growth rates, the average annual gross carbonate production was 6.85 ± 1.79 g CaCO₃ m⁻² y⁻¹, range 0–30.2 g CaCO₃ m⁻² y⁻¹. This carbonate production rate was about one order of magnitude lower than previous estimates from the Norwegian shelf.</div><div>A 2011 piston core through the mound was analyzed by CT-scan and subsampled for coral abundance. An age model from previous ¹⁴C and U/Th ages of coral fragments in the core yielded a long-term average coral carbonate accretion rate of 78 g CaCO₃ m⁻² y⁻¹ over the past ∼2150 y, range 40.8 (core-bottom) to 148.5 g CaCO₃ m⁻² y⁻¹ in the upper half, about 1–2 orders of magnitude lower than previous estimates from other regions.</div><div>Low carbonate accretion rates observed in the Guilvinec Canyon mounds could be attributable to recent declines in live coral cover, indicated by low abundance of live corals in ROV surveys from this site, compared to other regions of the Northeast Atlantic.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"220 ","pages":"Article 105451"},"PeriodicalIF":2.3,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unveiling marine heatwave dynamics in the Persian /Arabian Gulf and the Gulf of Oman: A spatio-temporal analysis and future projections","authors":"Mohamed Shaltout ,&nbsp;Ahmed Eladawy","doi":"10.1016/j.dsr2.2024.105435","DOIUrl":"10.1016/j.dsr2.2024.105435","url":null,"abstract":"<div><div>Amid escalating global marine heat waves, the Arabian Gulf is critical due to its shallow depths, high temperatures, and vulnerability to climate change impacts. This study provides a detailed spatio-temporal analysis of marine heatwave events from 1982 to 2022 across the Arabian Gulf and the adjacent Gulf of Oman. The study delineates regions of heightened vulnerability within these water bodies by comprehensively analyzing seasonal and annual variabilities and trend assessments. Moreover, an exploration of prevailing surface circulation patterns, underpinned by an extensive study of global circulation model outputs, elucidates the oceanographic mechanisms contributing to temperature dynamics. Identifying 25 significant heat wave events, with a focused examination of the six most protracted episodes, is noteworthy among the findings. Strikingly, the analysis reveals that the Gulf of Oman surpasses the Arabian Gulf in heatwave intensity. Looking forward, the investigation extends to future surface water temperature projections up to the close of the current century. The collective results underscore the region's acute susceptibility to the climate change perturbations of climate change, emphasizing the urgency of targeted interventions to mitigate these effects and address concurrent local stressors.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"218 ","pages":"Article 105435"},"PeriodicalIF":2.3,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657495","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":"Ecophenotypic variation in a cosmopolitan reef-building coral suggests reduced deep-sea reef growth under ocean change","authors":"Giovanni Sanna ,&nbsp;André Freiwald","doi":"10.1016/j.dsr2.2024.105434","DOIUrl":"10.1016/j.dsr2.2024.105434","url":null,"abstract":"<div><div>Sensitivity of reef-building corals to environmental factors has far-reaching ecosystem implications, especially in the limited number of cold-water coral (CWC) species that form reefs in the deep sea. Understanding CWC responses to large-scale oceanographic variation in their natural habitat can elucidate their sensitivity to global anthropogenic stressors. Here, we use skeletal samples to analyse fine-scale phenotypic variation in the widespread reef-building CWC <em>Desmophyllum pertusum</em> (<em>Lophelia pertusa</em>) in relation to broad physicochemical gradients in different sites across the Atlantic Ocean and Mediterranean Sea. We find evidence, amidst local and regional differentiation, of species-wide growth responses to physicochemical factors, mainly affecting corallite length, width and their ratio (slenderness). Our results suggest that higher temperature and lower oxygen levels negatively affect skeletal linear extension and budding rate of polyps. As also hinted by the reduced corallite length and slenderness in less developed reefs, these widespread responses may lead to a general decline in CWC reef growth rates as a long-term consequence of ocean warming and deoxygenation. Given this relevance, such responses can be used to model reef growth in a changing ocean.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"218 ","pages":"Article 105434"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Siliceous microfossil assemblages in the southern Emperor Seamount Chain sediments and their biogeographical and paleoceanographical implications","authors":"Lidiya N. Vasilenko ,&nbsp;Ira B. Tsoy ,&nbsp;Tatyana N. Dautova","doi":"10.1016/j.dsr2.2024.105433","DOIUrl":"10.1016/j.dsr2.2024.105433","url":null,"abstract":"<div><div>The taxonomic composition and abundance of siliceous microfossils in sediments is a valuable source of information about environmental changes at the sea surface today and in the geological past. This paper presents the results of a study of siliceous microplankton (radiolaria, diatoms, and silicoflagellates) in the surface calcareous sediments (silty foraminiferal oozes and sands) of the Nintoku, Jingu, Ojin, Koko, and Yuryaku guyots at the southern end of the Emperor Seamount Chain (ESC). Bottom sediments were collected using an underwater remote-operated vehicle (ROV) Comanche-18. The study revealed the taxonomic diversity and relatively high abundance of siliceous microplankton. Radiolarians are represented by 237 taxa (104 taxa from 68 genera of Spumellaria, 120 taxa from 61 genera of Nassellaria, and 13 taxa from 7 genera of Collodaria). Diatoms are represented by 60 species from 29 genera, and silicoflagellates by 5 species from 3 genera. Differences in siliceous microplankton reflect the northern boundary of warm water in the ESC, passing at approximately 38°N, between the Jingu and Ojin guyots, which coincides with the boundary of the Kuroshio Bifurcation Current, confirmed by the corals and the bathyal fauna of brittle stars (<em>Ophiura</em>). The absence of remains of siliceous microplankton in some sediments is probably due to dissolution, and the presence of extinct taxa from older sedimentary rocks and neritic species is due to process of reworking caused by active hydrodynamics on ESC guyots and transport by currents.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"218 ","pages":"Article 105433"},"PeriodicalIF":2.3,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593800","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":"The first Mud Dragons (Kinorhyncha) from the Emperor Seamount Chain (Northwestern Pacific) with notes on their biogeography and distribution patterns in the Pacific Deep-Sea","authors":"Andrey V. Adrianov ,&nbsp;Anastassya S. Maiorova","doi":"10.1016/j.dsr2.2024.105430","DOIUrl":"10.1016/j.dsr2.2024.105430","url":null,"abstract":"<div><div>Seamounts and oceanic currents play crucial roles in shaping the genetic diversity of species by either acting as barriers or pathways for species dispersal. In the meiofaunal samples collected using ROV facilities at the slope of the Koko Guyot (2172 m) in the southernmost part of the Emperor Seamount Chain in the Northwestern Pacific, we found representatives of three kinorhynch genera, <em>Echinoderes</em> cf. <em>lupherorum</em> Sørensen et al. 2018, <em>Campyloderes</em> cf. <em>vanhoeffeni</em> Zelinka, 1913 and <em>Sphenoderes</em> sp. 1., previously known from other locations in the Pacific. Kinorhynchs were studied and illustrated using light (LM) and scanning electron (SEM) microscopy to prove the species identity and to compare morphological variations with representatives of these species collected from other, very distant localities in the Pacific. We illustrate the pan-oceanic distribution of the collected species with a system of abyssal currents in the Pacific. The probable distribution pattern corresponds with the northward pathway of Antarctic Bottom Water out of the Southern Ocean in the Pacific through the deep-sea area off New Zealand. <em>Echinoderes lupherorum</em> appears to be the first representative of the Echinoderidae with the pan-Pacific distribution. Discussions on the biogeography of <em>Campyloderes</em> cf. <em>vanhoeffeni</em> Zelinka, 1913 and <em>Sphenoderes</em> in the Pacific are also provided.</div></div>","PeriodicalId":11120,"journal":{"name":"Deep-sea Research Part Ii-topical Studies in Oceanography","volume":"218 ","pages":"Article 105430"},"PeriodicalIF":2.3,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534936","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}