Deep-Sea Research Part I-Oceanographic Research Papers最新文献

{"title":"Mesoscale ocean eddies determine dispersal and connectivity of corals at the RMS Titanic wreck site","authors":"Tobias Schulzki ,&nbsp;Lea-Anne Henry ,&nbsp;J. Murray Roberts ,&nbsp;Maria Rakka ,&nbsp;Steve W. Ross ,&nbsp;Arne Biastoch","doi":"10.1016/j.dsr.2024.104404","DOIUrl":"10.1016/j.dsr.2024.104404","url":null,"abstract":"<div><div>The sinking of the RMS <em>Titanic</em> on 15 April 1912 remains one of most iconic maritime disasters in history. Today, the wreck site lies in waters 3800 m deep approximately 690 km south southeast of Newfoundland, Atlantic Canada. The wreck and debris field have been colonized by many marine organisms including the octocoral <em>Chrysogorgia agassizii</em>. Because of the rapid deterioration of the <em>Titanic</em> and the vulnerability of natural deep-sea coral populations to environmental changes, it is vital to understand the role the <em>Titanic</em> as well as other such structures could play in connecting ecosystems along the North American slope. Based on Lagrangian experiments with more than one million virtual particles and different scenarios for larval behavior, given the uncertainties around the biology of <em>chrysogorgiids</em>, the dispersal of larvae spawned at the <em>Titanic</em> wreck is studied in a high-resolution numerical ocean model. While the large-scale bathymetry shields the <em>Titanic</em> from a strong mean flow, mesoscale ocean eddies can considerably affect the deep circulation and cause a significant speed up, or also a reversal, of the circulation. As a consequence, the position of upper and mid-ocean eddies in the model largely controls the direction and distance of larval dispersal, with the impact of eddies outweighing the importance of active larval swimming in our experiments. Although dependent on larval buoyancy and longevity, we find that the <em>Titanic</em> could be reached by larvae spawned on the upper slope east of the Grand Banks. Therefore, the <em>Titanic</em> could act as a stepping stone connecting the upper to the deep continental slope off Newfoundland. From the <em>Titanic</em>, larvae then spread into deep Canadian waters and areas beyond national jurisdiction.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"213 ","pages":"Article 104404"},"PeriodicalIF":2.3,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142416529","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":"Photophysiological status of phytoplankton communities in different types of eddies during winter in the western Pacific Ocean","authors":"Jiang Gui ,&nbsp;Yingjie Mao ,&nbsp;Jun Sun ,&nbsp;Mao Lin","doi":"10.1016/j.dsr.2024.104402","DOIUrl":"10.1016/j.dsr.2024.104402","url":null,"abstract":"<div><div>The Western Pacific Ocean (WPO) is one of the most active eddy regions in the world, where a variety of ocean processes are frequently observed, but little research has been conducted on the phytoplankton communities and their photosynthetic physiological status within the eddies in this region. The bio-optical parameters of phytoplankton communities and their physiological status within the warm core and cold core eddies of the WPO during the winter of 2021 were investigated based on fast repetition rate fluorometry (FRRF). In this paper, environmental factors, phytoplankton community parameters, chlorophyll <em>a</em> (Chl <em>a</em>), and various bio-optical parameters were investigated for two opposite types of eddies at the WPO. The results show the maximum [Fv/Fm, 0.18 to 0.26 (warm eddy), 0.14 to 0.28 (cold eddy)] and effective photosynthetic efficiency [Fq'/Fm', 0.11 to 0.23 (warm eddy), 0.10 to 0.27 (cold eddy)] of the DCM for both warm and cold eddies, the electron transport rates ETR_RCII [0.002–6.18 mol e⁻ mol RCII⁻¹ s⁻¹ (warm eddy), 0.002–4.94 mol e⁻ mol RCII⁻¹ s⁻¹ (cold eddy)] and the primary production potential <em>PP</em>_max [0.68–118.19 mg C (mg Chl <em>a</em>)⁻¹ day⁻¹ (warm eddy), 2.47–243.49 mg C (mg Chl <em>a</em>)⁻¹ day⁻¹ (cold eddy)] for different types eddies. In warm eddy, temperature and Chl <em>a</em> concentrations had significant effects on Fv/Fm and Fq'/Fm', while in cold eddy the correlation of Fv/Fm and Fq'/Fm' with temperature was not significant, and Fv/Fm was significantly negatively correlated with DIP only. Light was the main variable affecting the electron transport capacity and primary production potential of the phytoplankton community in the eddies, while larger cyanobacteria and dinoflagellates contributed significantly to the primary production potential of the cold eddy. In addition, both eddies centers had higher primary production potentials, with the cold eddy had a higher primary production potential than the warm eddy, based on microscopic analysis this phenomenon may be due to differences in electron transfer rates between phytoplankton communities.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"213 ","pages":"Article 104402"},"PeriodicalIF":2.3,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358322","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 review of deep-seawater samplers: Principles, applications, performance, and trends","authors":"Shijun Wu ,&nbsp;Zhiheng Chen ,&nbsp;Shuo Wang ,&nbsp;Jian Zhang ,&nbsp;Canjun Yang","doi":"10.1016/j.dsr.2024.104401","DOIUrl":"10.1016/j.dsr.2024.104401","url":null,"abstract":"<div><p>Research on deep seawater is of great importance to marine chemistry, biology, and climate science studies. Sample analysis is the fundamental and most effective method for deep-seawater research, and it is essential to collect high-quality water samples for the scientific community. Over nearly a century, various deep-seawater samplers have been developed to meet different research needs. This study provides a comprehensive review of deep-seawater sampling technology and instruments to highlight the associated research background and importance, summarize sampling principles, and categorize typical samplers. This review focuses on the key technologies that deep-seawater samplers perform, including sealing, pressure maintenance, and temperature maintenance. Finally, prospects are presented in terms of three aspects: high fidelity, long-term series sampling, and precise sampling using autonomous underwater vehicles. This review can serve as a reference to achieve the precise sampling of deep seawater with high fidelity and spatiotemporal resolution in the future.</p></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"213 ","pages":"Article 104401"},"PeriodicalIF":2.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241715","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":"Cold-water octocoral interactions with microplastics under laboratory conditions","authors":"João M. Pereira ,&nbsp;Marina Carreiro-Silva ,&nbsp;Anaïs Sire de Vilar ,&nbsp;António Godinho ,&nbsp;Ceri Lewis ,&nbsp;Christopher K. Pham","doi":"10.1016/j.dsr.2024.104400","DOIUrl":"10.1016/j.dsr.2024.104400","url":null,"abstract":"<div><p>Microplastic pollution is ubiquitous in the oceans, threatening the health of marine ecosystems. The deep sea is recognized as a sink for microplastics, but there is a paucity of information on how deep-sea organisms are being affected by this stressor. Considering their vulnerability to disturbance, this information is crucial to fully understand the need for conservation actions. Here, we develop a novel methodology to provide a detailed characterisation of the behavioural responses of the cold-water octocoral <em>Viminella flagellum</em> to microplastic exposure under laboratory conditions. Coral fragments were individually exposed to a concentration of 1500 items/L of fluorescent green polyethylene microspheres biofouled for three weeks, for a period of 24 h, and carefully monitored for the entire exposure period using high resolution time-lapse video. After exposure, each fragment was transferred to another tank, free of microplastics, and monitored for further 24 h. The coral fragments were dissected at the end of the experimental period to assess the number of microplastics that remained in the digestive tract of each polyp. Our results showed that during this short-term exposure period, <em>V. flagellum</em> was ingesting microspheres, but most importantly it demonstrated the capacity of egesting all particles within 24 h. These results are especially important when quantifying microplastic contamination in cold-water corals in their natural habitat, as only recently ingested microplastics may be detected, leading to potential underestimations of their exposure. Additionally, our results indicated that microplastics adhered to the coral tissue surface could be discarded through periodic shedding of the mucus. These observations suggest that cold-water octocorals can handle microplastics as they do with other foreign particles, although the cleaning mechanisms may require significant energy expenditures.</p></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"213 ","pages":"Article 104400"},"PeriodicalIF":2.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0967063724001705/pdfft?md5=bb0147cfce56209a8b56d24798333514&pid=1-s2.0-S0967063724001705-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229379","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":"Present and future distribution of the deep-sea habitat-forming sponge - Pheronema carpenteri (Thomson, 1869) in a changing ocean","authors":"Inês Gregório ,&nbsp;Joana R. Xavier ,&nbsp;Andrew J. Davies","doi":"10.1016/j.dsr.2024.104390","DOIUrl":"10.1016/j.dsr.2024.104390","url":null,"abstract":"<div><p>Sponges play vital roles in the ecosystem function of the deep sea. Some species, such as the birds' nest sponge <em>Pheronema carpenteri</em>, can form highly structured and dense habitats (i.e., aggregations), which contribute to the increase of nearby biodiversity. Climate change is expected to have a pronounced impact on the deep sea, particularly on Vulnerable Marine Ecosystems such as those formed by the glass sponge <em>Pheronema carpenteri</em>. These ecosystems are especially vulnerable to climate change and other anthropogenic activities since they are formed by sensitive species with slow growth rates and limited dispersal capability, which can hinder their adaptive capability and recovery after disturbance. The impact that climate change will have on <em>Pheronema carpenteri</em> remains unclear, although it is expected to influence the species' available suitable habitat and distribution range. The aim of this study was to predict the distribution of the glass sponge <em>Pheronema carpenteri</em> both for present day and under several future climate scenarios in the North Atlantic. An ensemble modelling approach was employed, combining Maximum Entropy, Generalized Additive Models and Random Forest techniques. Changes in available suitable habitat were projected to present day and to three future climatic scenarios (RCP 2.6, RCP 4.5 and RCP 8.5). Depth, temperature and dissolved oxygen were identified as the key predictor variables of habitat suitability, which patterns suggest a strong influence of the Mediterranean Outflow Water in shaping the present day distribution of the species, particularly in the eastern North Atlantic. Our results indicate a potential expansion of available suitable habitat in the northernmost region of the study area, with a contraction at lower latitudes, more prominent in the Portuguese archipelago of the Azores. Under the worst-case scenario (RCP 8.5), the area of suitable habitat will likely double compared to present, occupying approximately 6% of the total study area. The management and conservation of areas where <em>Pheronema</em> aggregations can occur should be articulated between different countries, particularly in the Northeast Atlantic since, cumulatively, most of <em>Pheronema's</em> climate refugia occurs within their EEZs. Nonetheless, a significant proportion of the species' climate refugia is located in areas within the High Seas (i.e., Rockall plateau).</p></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"213 ","pages":"Article 104390"},"PeriodicalIF":2.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0967063724001602/pdfft?md5=b0b4d16d8739cbe5e4ce320dd7bbdb24&pid=1-s2.0-S0967063724001602-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142161902","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":"Advancing the frontier of fish geolocation into the ocean’s midwaters","authors":"M.C. Arostegui ,&nbsp;P. Afonso ,&nbsp;L. Fauconnet ,&nbsp;J. Fontes ,&nbsp;B.C.L. Macena ,&nbsp;C. Meyer ,&nbsp;T. Morato ,&nbsp;C.D. Braun","doi":"10.1016/j.dsr.2024.104386","DOIUrl":"10.1016/j.dsr.2024.104386","url":null,"abstract":"<div><p>Tracking large-scale movements of fishes in the ocean’s midwaters, below the euphotic zone and above the seafloor, is extremely challenging. Archival satellite telemetry devices rely on light, sea surface temperature, or bottom depth data to estimate location. Consequently, geolocation of fishes inhabiting the twilight (mesopelagic: 200–1000 m) and midnight (bathypelagic: 1000–4000 m) zones has been restricted to hypothesized movement routes, thereby precluding a baseline ecological understanding against which to assess potential anthropogenic impacts. We assessed the viability of comparing depth-temperature profiles measured by animal-borne satellite tags against those from 3D ocean-resolving models and incorporated known locations from acoustic telemetry to enable a quantitative framework for deep-sea geolocation. Testing of alternative, data-driven likelihood scenarios on a deep-water shark species assemblage with marked variation in modal depth distributions confirmed that the methodological frontier of geolocation can be advanced into the twilight and midnight zones. We identify key limitations in deep-water geolocation, and ways to overcome them, identifying a viable path for robust location estimates that can help address the knowledge gap on fish movement ecology in the deep sea. Our findings suggest that leveraging state-of-the-art geolocation approaches, in combination with novel technologies, raises new opportunities for studying enigmatic deep-ocean ecosystems.</p></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"212 ","pages":"Article 104386"},"PeriodicalIF":2.3,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142094647","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":"What do glass sponges do when no one is looking? Vazella pourtalesii: Responses to sediment deposition, passive locomotion, and contracting behavior","authors":"Jordi Grinyó ,&nbsp;Jacopo Aguzzi ,&nbsp;Luciano Ortenzi ,&nbsp;Ellen Kenchington ,&nbsp;Simona Violino ,&nbsp;Ulrike Hanz ,&nbsp;Andreu Santín ,&nbsp;Tim W. Nattkemper ,&nbsp;Furu Mienis","doi":"10.1016/j.dsr.2024.104388","DOIUrl":"10.1016/j.dsr.2024.104388","url":null,"abstract":"<div><div>Behavioral response of deep-sea sponges can provide crucial insights into the mechanisms shaping energy fluxes and ecosystem functioning. Although some advances have been made, the behavior of deep-sea Hexactinellid still remain widely unknown. In the present study we address the glass sponge <em>Vazella pourtalesii</em> behavior. High-temporal resolution imaging and environmental data were acquired with an autonomous lander deployed in the Sambro Bank Sponge Conservation Area (Scotian Shelf) at a depth of 150 m, representing the upper limit of this deep-sea species' distribution and what is commonly regarded as the deep sea.</div><div>For 94 days, a <em>V. pourtalesii</em> individual was monitored, providing quantitative information on its response to sediment deposition triggered by a storm, as well as on its passive locomotion and contractive behavior. Sediment was cleared from its surface within 72 h, which is highly relevant for its filtering capacity, indicating that this sponge species can cope with high suspended sediment concentrations. This enables it to occur on sedimentary environments like the Scotian Shelf. As observed in other deep-sea hexactinellids, the monitored individual engaged in rhythmic contractions, which appear to be driven by physiological process/es rather than environmental factors. During the study period, strong bottom currents (&gt;37 cm/s) toppled and displaced the monitored individual several times. Despite changes in position and orientation that can negatively impact the filtering capacity of sponges, no signs of deterioration were observed. <em>V. pourtalesii</em>'s vase-like body morphology and attachment to cobbles, as a gravitational center, may allow it to have a more homogeneous interaction with currents which may permit them to better cope with positional changes. Overall, this study highlights that deep-sea Porifera display a wide array of phenological changes in response to both biotic and abiotic factors.</div></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"213 ","pages":"Article 104388"},"PeriodicalIF":2.3,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313032","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":"Submesoscale ocean dynamic process contributions to diurnal subsurface chlorophyll variation along Lagrangian recirculation inside mesoscale eddies: A case study in the Southern Ocean","authors":"F. Liu ,&nbsp;S. Tang","doi":"10.1016/j.dsr.2024.104389","DOIUrl":"10.1016/j.dsr.2024.104389","url":null,"abstract":"<div><p>Studies regarding oceanic mesoscale and submesoscale processes and their impact on chlorophyll are mainly confined to weeks to decadal time scales. Based on biogeochemical-Argo float observations and altimeter data in the Southern Ocean in summer of 2016, we show the day-night chlorophyll difference inside a cyclonic eddy (ΔChl_TCE) and an anticyclonic eddy (ΔChl_TACE) associated with submesoscale processes. A diurnal cycle of chlorophyll is observed in the upper 50 m, with ΔChl_TCE (1.5 mg m⁻³) as much as ten times that of ΔChl_TACE (0.15 mg m⁻³). However, there are similar ratios of day-night chlorophyll difference to the maximum chlorophyll concentration in a day for the cyclonic and anticyclonic eddies (∼67%). Submesoscale processes present different impacts on the subsurface chlorophyll between the cyclonic and anticyclonic eddies on the diurnal scale. More significant submesoscale processes in the cyclonic eddy dominate the subsurface negative ΔChl_TCE. It causes the phytoplankton to penetrate the bottom of the mixed layer and extend ∼50 m below the mixed layer. In contrast, submesoscale processes and their associated with vertical buoyancy flux only generate weak negative subsurface ΔChl_TACE. The strong vertical gradient of ΔChl_TACE is mainly dominated by the vertical displacement of the deep chlorophyll maximum.</p></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"212 ","pages":"Article 104389"},"PeriodicalIF":2.3,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142089211","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":"Oceanic response to tropical cyclone in the northern South China Sea observed by underwater gliders during 2018 and 2020","authors":"Yanfeng Zhang ,&nbsp;Han Zhang ,&nbsp;Xiaodong Tang ,&nbsp;Shaoqiong Yang ,&nbsp;Yanhui Wang ,&nbsp;Xiayan Lin ,&nbsp;Di Tian ,&nbsp;Dake Chen","doi":"10.1016/j.dsr.2024.104387","DOIUrl":"10.1016/j.dsr.2024.104387","url":null,"abstract":"<div><p>In this study, we mainly used in-situ observations from underwater gliders to analyze the ocean response in the northern South China Sea affected by Son-tinh (2018), Mandal et al. (2018) Mangkhut (2018)and Noul (2020). The results showed that these TCs caused 0.6 °C, 1.1 °C and 1.7 °C maximum sea surface temperature cooling respectively, which were weaker than general conditions because of long distance, weak intensity and fast movement speed. Net solar radiation, precipitation, 10-m wind and sea surface heat flux also made contribution in changes of SST. The mixed layer depth (MLD) became shallower after Son-Tinh and Noul passed through, while during Mangkhut it did not change significantly. After TCs passed through, the stratification around MLD became more obvious, with a banded distribution and stronger high-value areas of buoyancy frequency. Within 1 week after the shortest distance, the temperature and salinity responses in the upper ocean were stronger than those at the sea surface, and the gradients of temperature and salinity and their anomalies were more evident in the subsurface layer. The results of this study show that underwater glider observations are important for understanding oceanic responses to tropical cyclones and are useful for studying tropical cyclone activities.</p></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"213 ","pages":"Article 104387"},"PeriodicalIF":2.3,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150783","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":"First telemetry insights into the movements and vertical habitat use of megamouth shark (Megachasma pelagios) in the northwest Pacific","authors":"P.J. Clerkin ,&nbsp;M.C. Arostegui ,&nbsp;W.C. Chiang ,&nbsp;S.J. Lin ,&nbsp;C.D. Miller ,&nbsp;C.D. Braun","doi":"10.1016/j.dsr.2024.104385","DOIUrl":"10.1016/j.dsr.2024.104385","url":null,"abstract":"<div><p>The megamouth shark (<em>Megachasma pelagios</em>) is one of the ocean's largest and most enigmatic elasmobranchs, with only a few hundred individuals ever recorded. Most of what is known about the species comes from rare fishery bycatch, stranding, or sighting events, precluding an in-depth understanding of its movement ecology. Here, we report the results from three megamouth sharks outfitted with pop-up satellite archival transmitting tags to assess the species' horizontal and vertical movement patterns. Deployments of 12, 58, and 244 d in duration provided the first direct evidence of multi-month fidelity to the waters east of Taiwan and seasonal movement out of the region. Depth and temperature data revealed a pattern of normal diel vertical migration, with the majority of the day spent in the mesopelagic zone and night in the epipelagic. Vertical habitat use suggests potential behavioral thermoregulation and was consistent with tracking of migrating mesopelagic prey across diel periods. We discuss the specialized analytical methods needed to reconstruct the spatial habitat use of deep-diving megamouth shark from tag sensor measurements of the magnetic field, as well as avenues for future research on this understudied megaplanktivore.</p></div>","PeriodicalId":51009,"journal":{"name":"Deep-Sea Research Part I-Oceanographic Research Papers","volume":"212 ","pages":"Article 104385"},"PeriodicalIF":2.3,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142077325","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}