New record of Munidopsis taiwanica (Decapoda, Anomura) from a mud volcano field in the Mariana Trench, with in-situ observations on habitat

Crustaceana ◽  
2018 ◽  
Vol 91 (3) ◽  
pp. 363-373 ◽  
Author(s):  
Dong Dong ◽  
Xinzheng Li
Keyword(s):  
New Record ◽  
Mud Volcano ◽  
In Situ Observation ◽  
Mariana Trench ◽  
Squat Lobster ◽  
The World ◽  
In Situ Observations ◽  
Seafloor Sediments ◽  
Squat Lobsters

Squat lobsters are prevalent in chemosynthetic environments but have been insufficiently studied in mud volcano habitats. An abyssal species,Munidopsis taiwanicaOsawa, Lin & Chan, 2008 was recently collected in a mud volcano field in the Mariana Trench at a depth greater than 5000 m, which represents a new distributional record. Its diagnostic characters are presented in this study. In-situ observation suggested thatM. taiwanicawas closely associated with this chemosynthetic environment and probably exhibited camouflage behaviour by attaching seafloor sediments onto its body.Munidopsis taiwanicais the first confirmed species of squat lobster found in the mud volcano environment, and currently represents the deepest record (5491 m) of squat lobsters in the world.

scholarly journals Pelagic deep-sea fauna observed on video transects in the southern Norwegian Sea

Polar Biology ◽  
2021 ◽  
Author(s):  
Philipp Neitzel ◽  
Aino Hosia ◽  
Uwe Piatkowski ◽  
Henk-Jan Hoving
Keyword(s):  
First Record ◽  
Observation System ◽  
In Situ Observation ◽  
Norwegian Sea ◽  
Video Recordings ◽  
In Situ Observations ◽  
Abundance And Distribution ◽  
Oceanic Food Webs ◽  
Deep Sea Fauna

AbstractObservations of the diversity, distribution and abundance of pelagic fauna are absent for many ocean regions in the Atlantic, but baseline data are required to detect changes in communities as a result of climate change. Gelatinous fauna are increasingly recognized as vital players in oceanic food webs, but sampling these delicate organisms in nets is challenging. Underwater (in situ) observations have provided unprecedented insights into mesopelagic communities in particular for abundance and distribution of gelatinous fauna. In September 2018, we performed horizontal video transects (50–1200 m) using the pelagic in situ observation system during a research cruise in the southern Norwegian Sea. Annotation of the video recordings resulted in 12 abundant and 7 rare taxa. Chaetognaths, the trachymedusaAglantha digitaleand appendicularians were the three most abundant taxa. The high numbers of fishes and crustaceans in the upper 100 m was likely the result of vertical migration. Gelatinous zooplankton included ctenophores (lobate ctenophores,Beroespp.,Euplokamissp., and an undescribed cydippid) as well as calycophoran and physonect siphonophores. We discuss the distributions of these fauna, some of which represent the first record for the Norwegian Sea.

Long-term in situ observations at the Athina mud volcano, Eastern Mediterranean: Taking the pulse of mud volcanism

2017 ◽  
Vol 721 ◽  
pp. 12-27 ◽  
Author(s):  
Walter Menapace ◽  
David Völker ◽  
Heiko Sahling ◽  
Christian Zoellner ◽  
Christian dos Santos Ferreira ◽  
...  
Keyword(s):  
Eastern Mediterranean ◽  
Mud Volcano ◽  
Mud Volcanism ◽  
In Situ Observations

scholarly journals On the Feasibility of In-Venue Observations of Electronic Gaming Machine Gamblers and Game Characteristics

2017 ◽  
Author(s):  
Jason Landon ◽  
Katie Palmer Du Preez ◽  
Maria Bellringer ◽  
Max Abbott ◽  
Amanda Roberts
Keyword(s):  
New Zealand ◽  
Observational Studies ◽  
In Situ Observation ◽  
Harm Minimization ◽  
Observable Effect ◽  
In Situ Observations ◽  
Gaming Machine ◽  
Gaming Machines ◽  
Valid Information

Detailed observational studies of undisturbed gambler behaviour in venues are rare, especially when the focus is on continuous gambling such as electronic gaming machines (EGMs). EGMs are the main source of harmful gambling in New Zealand and all EGMs in New Zealand now include a mandatory pop-up message feature. The present study reports on 48 hours of in situ observations of EGM gamblers in casino and non-casino (pub) venues in New Zealand. We sought to establish whether relatively detailed observations of EGM features and gambler behaviour in venues were possible. The EGM feature that we focused on were pop-up messages, given their harm-minimization potential and the relative ease with which they can be observed. However, other EGM features were also documented, along with descriptive accounts of associated gambler behaviour. The results establish that relatively detailed (quantitative or qualitative) observational data can be collected in venues by using smart phones. The data showed that pop-up messages were generally attended to, but had little observable effect on gambler behaviour in venues. Direct in situ observation of gamblers can provide ecologically valid information to complement more common experimental and survey-based approaches. Suggestions are made for developing the procedure.Les études d’observation détaillée in situ sur le comportement non perturbé de joueurs sont rares, surtout si on met l’accent sur le jeu continu, comme avec les appareils de jeux électroniques. En Nouvelle-Zélande, ces appareils sont la principale source de jeux compulsifs, et tous les appareils dans ce pays incluent dorénavant une fonctionnalité obligatoire de message contextuel. La présente étude fait état de 48 heures d’observation in situ de joueurs sur appareils dans des casinos ou d’autres lieux (bars) en Nouvelle-Zélande, et on a cherché à déterminer s’il était possible de faire des observations relativement détaillées des caractéristiques et du comportement de joueurs dans ces lieux. On a mis l’accent sur la fonctionnalité des messages contextuels pour analyser leur potentiel de diminuer des méfaits et leur relative facilité à les observer. On a aussi consigné d’autres fonctionnalités d’appareils de jeu, ainsi que des comptes-rendus descriptifs du comportement des joueurs associés. Les résultats montrent que l’on peut recueillir des données d’observation in situ relativement détaillées (quantitatives ou qualitatives) à l’aide de téléphones intelligents. Les données montrent que les messages contextuels ont généralement été pris en compte, mais qu’ils ont eu peu d’effet observable sur le comportement des joueurs. L’observation directe de joueurs peut fournir des informations écologiquement valables pour appuyer les approches expérimentales communes par sondage. On y fait aussi quelques suggestions pour mettre en œuvre une procédure.

scholarly journals In situ observation of cracking and self-healing of solid electrolyte interphases during lithium deposition

2020 ◽  
Author(s):  
Tingting Yang ◽  
Hui Li ◽  
Yongfu Tang ◽  
Jingzhao Chen ◽  
Hongjun Ye ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Solid Electrolyte Interphase ◽  
Dendrite Growth ◽  
In Situ Observation ◽  
Self Healing ◽  
Directional Growth ◽  
Transmission Electron ◽  
In Situ Observations ◽  
Li Batteries

Abstract The growth of lithium (Li) whiskers is detrimental to Li batteries. However, it remains a challenge to directly track Li whisker growth. Here we report in situ observations of electrochemically induced Li deposition under a CO2 atmosphere inside an environmental transmission electron microscope. We find that the morphology of individual Li deposits is strongly influenced by the competing processes of cracking and self-healing of the solid electrolyte interphase (SEI). When cracking overwhelms self-healing, the directional growth of Li whiskers predominates. In contrast, when self-healing dominates over cracking, the isotropic growth of round Li particles prevails. The Li deposition rate and SEI constituent can be tuned to control the Li morphologies. We reveal a new “weak-spot” mode of Li dendrite growth, which is attributed to the operation of the Bardeen-Herring growth mechanism in the whisker’s cross section. This work has implications for the control of Li dendrite growth in Li batteries.

In situ observations of predatory feeding behaviour of the galatheid squat lobster Munida sarsi using a remotely operated vehicle

2003 ◽  
Vol 83 (3) ◽  
pp. 463-464 ◽  
Author(s):  
Ian R. Hudson ◽  
Benjamin D. Wigham
Keyword(s):  
Feeding Strategy ◽  
Remotely Operated Vehicle ◽  
The West ◽  
Squat Lobster ◽  
Video Footage ◽  
Benthic Crustacean ◽  
In Situ Observations ◽  
The Individual ◽  
The Uk

During remotely operated vehicle operations on the UK continental shelf to the west of Shetland (60°6′N 4°4′W) at a depth of 400 m, Munida sarsi, a common benthic crustacean was observed actively preying on the northern krill Meganyctiphanes norvegica. Video footage shows the individual using its chelipeds to catch prey items as they swarm around its burrow. These initial observations indicate that predation forms a new feeding strategy for a species previously believed to be an active scavenger.

scholarly journals Comparative study on long term climate data sources over South Korea

2018 ◽  
Vol 10 (3) ◽  
pp. 504-523 ◽  
Author(s):  
Dong-Ik Kim ◽  
Dawei Han
Keyword(s):  
South Korea ◽  
Climate Impact ◽  
Climate Data ◽  
The World ◽  
In Situ Observations ◽  
The Mean ◽  
Global Datasets ◽  
Different Parts

Abstract Long term climate data are vitally important in reliably assessing water resources and water related hazards, but in-situ observations are generally sparse in space and limited in time. Although there are several global datasets available as substitutes, there is a lack of comparative studies about their suitability in different parts of the world. In this study, to find out the reliable century-long climate dataset in South Korea, we first evaluate multi-decadal reanalyses (ERA-20 cm, ERA-20c, ERA-40 and NOAA 20th century reanalysis (20CR)) and gridded observations (CRUv3.23 and GPCCv7) for monthly mean precipitation and temperature. In the temporal and statistical comparisons, CRUv3.23 and GPCCv7 for precipitation and ERA-40 for temperature perform the best, and ERA-20c and 20CR also indicate meaningful agreements. For ERA-20 cm, it has only a statistical agreement, but the mean has the difficulty in representing its ensemble. This paper also shows that the applicability of each dataset may vary by region and all products should be locally adjusted before being applied in climate impact assessments. These findings not only help to fill in the knowledge gaps about these datasets in South Korea but also provide a useful guideline for the applicability of the global datasets in different parts of the world.

Low Temperature Synthesis of Carbon Nanotube on Si substrate Using Alcohol Gas Source in High Vacuum

2007 ◽  
Vol 1057 ◽  
Author(s):  
Takahiro Maruyama ◽  
Kenji Tanioku ◽  
Shigeya Naritsuka
Keyword(s):  
Low Temperature ◽  
Growth Temperature ◽  
Intensity Ratio ◽  
High Vacuum ◽  
In Situ Observation ◽  
Si Substrate ◽  
Growth Pressure ◽  
Gas Source ◽  
In Situ Observations

ABSTRACTConventional alcohol catalytic chemical vapor deposition (ACCVD) growth of carbon nanotubes (CNTs) have been carried out under ambient gases from 103 to105 Pa. These ambient gas pressures have prevented in situ observations using an electron beam during CNT growth, such as scanning electron microscopy (SEM), scanning tunneling microscopy (STM). Therefore, in order to realize the in situ observations and to clarify the growth mechanism of nanotube, CNT growth in a high vacuum is essential. In addition, the effects of residual gases also may be avoided in the growth under high vacuum. In this study, we carried out CNT growth under high vacuum using an alcohol gas source in an ultrahigh vacuum (UHV) chamber and we achieved CNT growth below 400°C without any excitation processes of carbon source. After deposition of Co catalyst of 1 nm in thickness on SiO2/Si substrate, ethanol gas was supplied to the substrate surface through a stainless steel nozzle in the UHV chamber. The growth temperature was monitored by a pyrometer during the growth, and set between 350 and 900°C. The supply of ethanol gas was controlled by monitoring an ambient pressure, which was varied from 1 ∼10-1 to 1 ∼10-4 Pa. The grown CNTs were characterized by SEM and Raman spectroscopy. The G/Si intensity ratio reached its maximum at 700°C, when the pressure was 1 ∼10-1 Pa. The maximum point of the G/Si peak intensity shifted to a lower temperature as the growth pressure decreased. When the pressure was 1 ∼10-4 Pa, the G/Si intensity ratio reached its maximum at 400°C, at which clear RBM peaks were observed in the Raman spectrum. From the RBM peaks, the CNT diameters were estimated to be between 0.9 to 1.7 nm, and CNTs of 1.2-1.4 nm in diameter were dominant at 1 ∼10-1 Pa, whereas thinner CNTs (diameter is below 1.0 nm) were increased with the reduction of the pressure. Our largest G/D ratio was about 40 for the sample grown at 1 ∼10-1 Pa, which is considerably larger than the reported value for the CNTs grown under low pressure. From these results, we conclude that the reduction of the growth pressure lowers the growth temperature. This technique can be applied to in situ observation, and may also be useful for low temperature growth of CNTs, which opens new possibilities for the fabrication of CNT based nanodevices.

Chronological Development of Terrestrial Mean Precipitation

2017 ◽  
Vol 98 (11) ◽  
pp. 2411-2428 ◽  
Author(s):  
Kylie J. Park ◽  
Kei Yoshimura ◽  
Hyungjun Kim ◽  
Taikan Oki
Keyword(s):  
Data Exchange ◽  
Research Unit ◽  
Global Scale ◽  
Climatic Research Unit ◽  
Telecommunication System ◽  
Spatial Coverage ◽  
Global Telecommunication System ◽  
The World ◽  
In Situ Observations

Abstract Over 150 years of investigations into global terrestrial precipitation are revisited to reveal how researchers estimated annual means from in situ observations before the age of digitization. After introducing early regional efforts to measure precipitation, the pioneering estimates of terrestrial mean precipitation from the late nineteenth and early twentieth centuries are compared to successive estimates, including those using the latest gridded precipitation datasets available. The investigation reveals that the range of the early estimates is comparable to the interannual variation in terrestrial mean precipitation derived from the latest Climatic Research Unit (CRU) dataset. In-depth revisions of the estimates were infrequent up to the 1970s, due in part to difficulty obtaining and maintaining up-to-date datasets with global coverage. This point is illustrated in a “family tree” that identifies the key publications that subsequent authors referenced, sometimes decades after the original publication. Significant efforts to collate global observations facilitated new investigations and improved data exchange, for example, in the International Hydrological Decade (1965–74) and following the establishment of the Global Telecommunication System under the World Weather Watch Programme of the World Meteorological Organization. Also in the 1970s were the first attempts to adjust in situ observations on a global scale to account for gauge undercatch, and this had a noticeable impact on mean annual estimates. There remains no single satisfactory approach to gauge bias adjustment. Echoing the repeated message of past researchers, today’s authors cite poor spatial coverage, temporal inhomogeneity, and inadequate sharing of in situ observations as the key obstacles to obtaining more accurate estimates of terrestrial mean precipitation.

In situ observations of Stygiomedusa gigantea in the Gulf of Mexico with a review of its global distribution and habitat

2010 ◽  
Vol 90 (6) ◽  
pp. 1079-1093 ◽  
Author(s):  
Mark C. Benfield ◽  
William M. Graham
Keyword(s):  
Gulf Of Mexico ◽  
The Arctic ◽  
Depth Range ◽  
Light Levels ◽  
Low Latitudes ◽  
The World ◽  
In Situ Observations ◽  
Scyphozoan Jellyfish ◽  
Available Information

Four individuals of the large scyphozoan jellyfish Stygiomedusa gigantea were observed in the northern Gulf of Mexico over 2005–2009 by industrial remotely operated vehicles as part of the SERPENT Project. One of these observations included the symbiotic bythitid fish Thalassobathia pelagica. Prior to these observations, neither S. gigantea nor T. pelagica had been observed in, or collected from the Gulf of Mexico. In order to summarize the available information on S. gigantea, we located 110 observations obtained over 110 years (1899–2009) representing 118 individual specimens of this species from around the world. The resulting dataset confirms that this species is cosmopolitan occurring with records from all oceans except the Arctic. While the depth-range of the four Gulf of Mexico specimens was bathypelagic, there appears to be a pattern of S. gigantea occurring in mesopelagic and epipelagic depth-zones at high latitudes, particularly in the Southern Ocean and mesopelagic and bathypelagic depths at mid- and low-latitudes. This pattern may be related to the meridional vertical distribution of temperature or perhaps avoidance of light levels that could degrade porphyrin pigments. There was no evidence that this species migrates vertically. Two of the individuals in the Gulf of Mexico appeared to be actively clinging to subsea structures and we speculate that this is a consequence of its normal mode of feeding, which may entail using its large oral lobes to hold on to, and trap prey.

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