The Experts below are selected from a list of 2463 Experts worldwide ranked by ideXlab platform
H. M. Moore - One of the best experts on this subject based on the ideXlab platform.
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Tentacular diversity in Deep-Sea Deposit-feeding holothurians: implications for biodiversity in the Deep Sea
Biodiversity & Conservation, 1997Co-Authors: D. Roberts, H. M. MooreAbstract:The tentacles of Deep-Sea holothurians show a wide range of morphological diversity. The present paper examines gross tentacle morphology in surface Deposit feeding holothurians from a range of bathymetric depths. Species studied included the elasipods: Oneirophanta mutabilis, Psychropotes longicauda and Benthogone roSea and the aspidochirotids: Paroriza prouhoi, Pseudostichopus sp., Bathyplotes natans and Paroriza pallens. The sympatric abyssal species Oneirophanta mutabilis, Psychropotes longicauda and Pseudostichopus sp. show subtle differences in diet and the structure and filling patterns of the gut that suggest differences in feeding strategies which may represent one mechanism to overcome competition for food resources in an environment where nutrient resources are considered to be, at least periodically, limiting. Interspecific differences in tentacle functional morphology and digestive strategies, which reflects taxonomic diversity could be explained in terms of Sanders'; Stability–Time Hypothesis. Since different tentacle types will turn over sediments to different extents, their impact on sedimentary communities will be enormous so that high diversity in meiofaunal communities may be explained most simply by Dayton and Hessler's Biological Disturbance Hypothesis.
D. Roberts - One of the best experts on this subject based on the ideXlab platform.
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Tentacular diversity in Deep-Sea Deposit-feeding holothurians: implications for biodiversity in the Deep Sea
Biodiversity & Conservation, 1997Co-Authors: D. Roberts, H. M. MooreAbstract:The tentacles of Deep-Sea holothurians show a wide range of morphological diversity. The present paper examines gross tentacle morphology in surface Deposit feeding holothurians from a range of bathymetric depths. Species studied included the elasipods: Oneirophanta mutabilis, Psychropotes longicauda and Benthogone roSea and the aspidochirotids: Paroriza prouhoi, Pseudostichopus sp., Bathyplotes natans and Paroriza pallens. The sympatric abyssal species Oneirophanta mutabilis, Psychropotes longicauda and Pseudostichopus sp. show subtle differences in diet and the structure and filling patterns of the gut that suggest differences in feeding strategies which may represent one mechanism to overcome competition for food resources in an environment where nutrient resources are considered to be, at least periodically, limiting. Interspecific differences in tentacle functional morphology and digestive strategies, which reflects taxonomic diversity could be explained in terms of Sanders'; Stability–Time Hypothesis. Since different tentacle types will turn over sediments to different extents, their impact on sedimentary communities will be enormous so that high diversity in meiofaunal communities may be explained most simply by Dayton and Hessler's Biological Disturbance Hypothesis.
Shi Xuefa - One of the best experts on this subject based on the ideXlab platform.
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the geochemical characteristics of rare earth elements rich Deep Sea Deposit of core gc11 in central indian ocean basin
Haiyang Xuebao 2019 Vol. 12 Pages 51-61, 2018Co-Authors: Zhang Xiaoyu, Shi Xuefa, Huang DasongAbstract:Measurement of major elements, trace elements and rare earth elements (REY) for sediment Core GC11 collected in the central Indian Ocean Basin were performed. Based on the analysis of interelemental correlation, REY enrichment and post-Archean Australian Shale (PAAS) normalization style, the factors impacting the REY enrichment are discussed. The study suggests that: the total amount of REY varies from 400.64×10-6 to 742.74×10-6, with an average of 658.41×10-6, which is slightly lower than that of Core GC02, however, is equivalent to that of the zeolite-bearing rich Deep-Sea Deposit in the Core DSDP213. The sediment exhibits distinct negative abnormal δCe and lower (La/Yb)N为0.42, with obvious positive correlation between REY and P2O5. The average value of CaO/P2O5 ratio is 2.3, demonstrating that the bio-apatite may be the main host mineral of REY. Although there is positive correlation between REY and Fe and Mn, hydroxyl hydrate of Fe and Mn have low impact to the enrichment of REY for the distinct negative abnormal δCe. The mixture with the terregeneous materials maybe the main cause inducing the differences of REY enrichment degree, δCe and PAAS normalization style.
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new type of sampler for Deep Sea Deposit grabwith tv and its usage
Coastal Engineering, 2011Co-Authors: Shi XuefaAbstract:Geologists pay much attention to in-situ survey and data acquisition,which can be available only by means of geological survey instrament.Traditional surface-Deposit samplers are grab sampler,box sampler,multitubular corer,etc.Now a new type of sampler for Deep-Sea Deposit—grab with TV is introduced here.At present,it takes an important part in Deep-Sea survey,resources surrey in mid-oceanic ridge area,especially in surveys for Deep-Sea floor massive sulphides survey,polymetallic nodules,manganese crust.Therefore it becomes a key point for a successful survey to master the performance and usage of the grab with TV.
William L. Fornes - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of excess 234 Th activity in sediments as an indicator of food quality for Deep-Sea Deposit feeders
Journal of Marine Research, 2003Co-Authors: Amanda W. J. Demopoulos, Craig R. Smith, David J. Demaster, William L. FornesAbstract:Deep-Sea Deposit feeders selectively ingest large volumes of sediment. Knowledge of the nature of this selectivity will help to elucidate the limiting nutritional requirements and geochemical impacts of these abundant animals. Shallow-water and theoretical studies suggest that Deep-Sea Deposit feeders should select particles rich in protein, bacterial biomass, and/or chloropigment concentrations. Recent studies indicate that Deep-Sea megafaunal Deposit feeders exhibit strong gut enrichment of excess (xs) 234 Th activity, even though 234 Thxs lacks nutritional value. To explore the significance of selective ingestion of 234 Thxs activity, we evaluated the correlations between 234 Thxs activity and three potential tracers of Deposit feeder food quality: chlorophyll a (chl a), enzymatically hydrolyzable amino acids (EHAA), and adenosine triphosphate (ATP). Surface sediments from three quiescent bathyal basins off Southern California (San Nicolas, Santa Catalina, and San Clemente) were collected by a multiple corer and analyzed for 234 Thxs activity, chl a, EHAA, ATP, and total organic carbon and nitrogen. 234 Thxs activity was positively correlated with chl a and phaeopigment concentrations and negatively correlated with EHAA concentrations. Excess 234 Th was not linearly correlated with concentrations of ATP, organic carbon, or total nitrogen. The results suggest that Deep-Sea Deposit feeders select sediments with high 234 Thxs activity because it is associated with recently settled phytodetrital material. There is no evidence that this 234 Thxs-rich material has particularly high concentrations of labile amino acids or microbial biomass. Phytodetrital material may be an important source of some other limiting nutrient to Deep-Sea Deposit feeders, e.g., polyunsaturated fatty acids, labile organic carbon and/or vitamins.
Amanda W. J. Demopoulos - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of excess 234 Th activity in sediments as an indicator of food quality for Deep-Sea Deposit feeders
Journal of Marine Research, 2003Co-Authors: Amanda W. J. Demopoulos, Craig R. Smith, David J. Demaster, William L. FornesAbstract:Deep-Sea Deposit feeders selectively ingest large volumes of sediment. Knowledge of the nature of this selectivity will help to elucidate the limiting nutritional requirements and geochemical impacts of these abundant animals. Shallow-water and theoretical studies suggest that Deep-Sea Deposit feeders should select particles rich in protein, bacterial biomass, and/or chloropigment concentrations. Recent studies indicate that Deep-Sea megafaunal Deposit feeders exhibit strong gut enrichment of excess (xs) 234 Th activity, even though 234 Thxs lacks nutritional value. To explore the significance of selective ingestion of 234 Thxs activity, we evaluated the correlations between 234 Thxs activity and three potential tracers of Deposit feeder food quality: chlorophyll a (chl a), enzymatically hydrolyzable amino acids (EHAA), and adenosine triphosphate (ATP). Surface sediments from three quiescent bathyal basins off Southern California (San Nicolas, Santa Catalina, and San Clemente) were collected by a multiple corer and analyzed for 234 Thxs activity, chl a, EHAA, ATP, and total organic carbon and nitrogen. 234 Thxs activity was positively correlated with chl a and phaeopigment concentrations and negatively correlated with EHAA concentrations. Excess 234 Th was not linearly correlated with concentrations of ATP, organic carbon, or total nitrogen. The results suggest that Deep-Sea Deposit feeders select sediments with high 234 Thxs activity because it is associated with recently settled phytodetrital material. There is no evidence that this 234 Thxs-rich material has particularly high concentrations of labile amino acids or microbial biomass. Phytodetrital material may be an important source of some other limiting nutrient to Deep-Sea Deposit feeders, e.g., polyunsaturated fatty acids, labile organic carbon and/or vitamins.
