[Patterns of maternal transfer of trace elements in the pelagic thresher shark () of the Eastern Pacific Ocean].

Pelagic sharks are vulnerable to overfishing due to slow growth rates, late-at-maturity and low fecundity, 90% of which are Near Threatened with an elevated risk of extinction according to IUCN Red List Criteria. Trace elements can be accumulated by marine predators and may have detrimental effects on population dynamics. In this study, we analyzed the concentrations of 11 trace elements (Zn, Cu, Cr, Ni, Mn, Se, Co, Hg, Cd, Pb, and As) in muscle and liver tissues of 10 pregnant pelagic thresher sharks () and their 18 embryos.

[Three-dimensional finite element analysis of the influence of different implant-abutment joint design on abutment and abutment screw stress].

Purpose: This experiment studied the influence of different connection designs of the tapered retention and platform transfer implant on the stress of the abutments and abutment screws.

Methods: Implant models (Platform-switching: 0.2, 0.

[Trophic niche partitioning of four pelagic shark species in the tropical Atlantic based on multi-tissue stable isotopes ratios].

Stable carbon and nitrogen isotope ratios (δC and δN, respectively) of multiple tissues with different turnover rates can provide trophic information at different timescales, and thus play an important role in tracing the changes of feeding, habitat utilization and trophic niche of consumers. The δC and δN contents of muscle, liver and blood of blue sharks (), longfin mako sharks (), crocodile sharks () and shortfin mako sharks () from tropical Atlantic were measured, and the trophic niche was evalua-ted. The results showed that , , and had similar δN values, higher than that of .

Trophic niche and gut microbiota of Dosidicus gigas in the eastern equatorial Pacific Ocean.

Understanding the adaptation of important marine species to environmental changes is critical for evaluating the effects of fisheries and climate change on marine services. The jumbo squid, , is a keystone species in the eastern Pacific, which plays an intermediate role in the marine food web. Better understanding of their responses to climate change would be a big step to understand their population dynamics.

[Study on the friction and wear properties of fluorapatite glass ceramics, feldspathic porcelain and natural tooth].

Purpose: The purpose of this study was to observe the friction and wear characteristics of dental fluorapatite glass ceramics, feldspathic porcelain and natural tooth in dry friction and saliva lubrication.

Methods: Two kinds of veneering porcelain (IPS-emaxcream and Vita vm9) coated zirconia-decorative porcelain double-layer material sample were prepared (size 20 mm × 20 mm × 4.5 mm), each group had 20 specimens.

[Assessment of heavy metal bioaccumulation in food web of the coastal waters of Jiangsu Province, China, based on stable isotope values (δC and δN)].

The coastal waters in Jiangsu Province have always been an important fishery base since ancient time. In recent years, with the development of the industry in coastal cities, heavy metal pollution is becoming serious in Jiangsu Province. However, the bioaccumulation of heavy metals in the coastal food web is still unclear.

[Selection of isotopic baselines in marine ecosystems].

Stable isotope analysis has been widely used in marine food web studies. An appropriate isotopic baseline is essential for calculating diet or trophic position of marine organisms when using stable isotopic data. This paper provided an overview of the selection of isotopic baselines for four ty-pical marine ecosystems, i.

[Food web foundation and seasonal variation of trophic structure based on the stable isotopic technique in the marine ranching of Haizhou Bay, China].

Stable isotope technique was applied to investigate the small and medium-size consumers including not only fish, shrimps, crabs, cephalopods, snails and bivalves, but also the specimens of their potential carbon sources, which were collected in the marine ranching area of Haizhou Bay during the spring of 2015. IsoSource model was adopted to calculate the contribution of potential carbon sources to the consumers. Biospeciemens collected in the summer of 2014 were compared with those in the spring of 2015, aiming to analyze the seasonal variation in the trophic structure of food web.

[Trophic niche partitioning of pelagic sharks in Central Eastern Pacific inferred from stable isotope analysis.].

As the apex predators of the open ocean ecosystems, pelagic sharks play important roles in stabilizing the marine food web through top-down control. Stable isotope analysis is a powerful tool to investigate the feeding ecology. The carbon and nitrogen isotope ratios can be used to trace food source and evaluate the trophic position of marine organisms.

[A study on feeding ecology and migration patterns of Dosidicus gigas off Peru using stable isotope analysis].

As a pelagic cephalopod and one of the main target species of Chinese distant water fishery, jumbo squids (Dosidicus gigas) play a major role in the marine ecosystems of the eastern Pacific. Understanding the feeding ecology and migration patterns of jumbo squids is of importance for better utilizing the resources. The isotopic signatures of gladius, have been proved to be a powerful tool to reveal high resolution and ontogenic variations in individual foraging strategies of squids; which is an archival tissue with no elemental turnover after formation.

[Effects of lipid extraction on stable carbon and nitrogen isotope analyses of Ommastrephes bartramii muscle].

Stable isotope analysis (SIA) has become an important tool to investigate diet shift, habitat use and trophic structure of animal population. Muscle is considered to be the most common tissue for SIA, however, lipid content in muscle causes a considerable bias to the interpretation of isotopic ratios of animals. Neon flying squid (Ommastrephes bartramii) is an important economic cephalopod of Chinese distant water fishery, and plays a major role in marine ecosystems.

[Review on the feeding ecology and migration patterns of sharks using stable isotopes].

With the rapidly increasing use of stable isotope analysis (SIA) in ecology, it becomes a powerful tool and complement to traditional methods for investigating the trophic ecology of animals. Sharks play a keystone role in marine food webs as the apex predators and are recently becoming the frontier topic of food web studies and marine conservation because of their unique characteristics of evolution. Recently, SIA has recently been applied to trophic ecology studies of shark species.

[Analysis on the ecosystem structure and function of Lake Taihu based on ecopath model].

Based on the data of lake survey conducted during 2008-2009 and the published data of the trophic ecology of key species, the exploited freshwater ecosystem of Lake Taihu was described using Ecopath with Ecosim 6.1 with the aim of characterizing its functioning and structure. The model comprised 20 functional groups including primary producers, the main species of fishes, nonfish vertebrates, and detritus.

[Applications of stable isotope analysis in the trophic ecology studies of cephalopods].

Cephalopods play an important role in marine food webs, however, knowledge about their complex life history, especially their feeding ecology, remains limited. With the rapidly increasing use of stable isotope analysis (SIA) in ecology, it becomes a powerful tool and complement of traditional methods for investigating the trophic ecology and migration patterns of invertebrates. Here, after summarizing the current methods for trophic ecology investigation of cephalopods, applications of SIA in studying the trophic ecology of cephalopods were reviewed, including the key issues such as standardization of available tissues for SIA analyzing, diet shift and migration patterns of cephalopods, with the aim of advancing its application in the biology of cephalopods in the future.

[Effects of canal-lining project on groundwater and ecological environment in Hetao Irrigation District of Inner Mongolia].

The canal-lining project in Hetao Irrigation District (HID) for water-saving irrigation has been implemented for many years. By using statistical method, ordinary Kriging, and software ArcGIS 9.0, this paper analyzed the spatiotemporal variation of groundwater table depth and salinity in HID in September, 2001 and 2009.