Stable Isotope Ratios and Uric Acid Preservation in Termites Belonging to Three Feeding Habits in Thailand

2000 ◽  
Vol 36 (3) ◽  
pp. 259-272 ◽  
Author(s):  
I. Tayasu ◽  
F. Hyodo ◽  
Y. Takematsu ◽  
A. Sugimoto ◽  
T. Inoue ◽  
...  
Keyword(s):  
Uric Acid ◽  
Stable Isotope ◽  
Feeding Habits ◽  
Isotope Ratios ◽  
Stable Isotope Ratios

scholarly journals Use of multielement stable isotope ratios to investigate ontogenetic movements of Micropogonias furnieri in a tropical Brazilian estuary

2018 ◽  
Vol 75 (6) ◽  
pp. 977-986 ◽  
Author(s):  
Ana Carolina Pizzochero ◽  
Loïc N. Michel ◽  
Simon R. Chenery ◽  
Ian D. McCarthy ◽  
Marcelo Vianna ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Continental Shelf ◽  
Feeding Habits ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Isotopic Niche ◽  
Guanabara Bay ◽  
Western Atlantic ◽  
Ecological Features ◽  
Micropogonias Furnieri

The whitemouth croaker, Micropogonias furnieri, is a long-lived fish of high commercial importance in the western Atlantic Ocean. Here, we used stable isotope ratios of carbon, sulfur, and nitrogen and isotopic niche metrics (SIBER) to study feeding habits and track habitat use by whitemouth croakers in Guanabara Bay, an estuary in Rio de Janeiro state, Brazil. Our results highlighted size-related habitat segregation, with small juvenile fishes (<30 cm) residing mostly inside estuaries and large adult fishes (>60 cm) feeding mainly in Continental Shelf waters. Medium adult fishes (30–60 cm) appear to feed in multiple coastal and Continental Shelf habitats. Moreover, their feeding ecology showed strong temporal differences, linked with seasonal and, to a lesser extent, interannual variation in oceanographic features of the ecosystem in which they live. Overall, these differences in ecological features suggest that (1) adult and juvenile whitemouth croakers should be treated as different components of the food web and (2) the conservation of these habitats should be prioritized to better manage and sustain the coastal fisheries in Guanabara Bay.

scholarly journals Feeding habits and population aspects of the spotted goatfish, Pseudupeneus maculatus (Perciformes: Mullidae), on the continental shelf of northeast Brazil

2020 ◽  
Vol 84 (2) ◽  
Author(s):  
Andrey Soares ◽  
Alex Souza Lira ◽  
Júlio Guazzelli Gonzalez ◽  
Leandro Nolé Eduardo ◽  
Flávia Lucena-Frédou ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Continental Shelf ◽  
Trophic Position ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Distribution Patterns ◽  
Isotope Ratios ◽  
Stomach Content Analysis ◽  
Stable Isotope Ratios ◽  
Weight Percentage

This study provides information about the feeding habits, population aspects and spatial distribution of the spot­ted goatfish, Pseudupeneus maculatus, along the coast of the tropical Brazilian continental shelf. Distribution patterns are described using length frequencies and catch rates. Stable isotope ratios of carbon (δ13C) and nitrogen (δ15N), along with stomach contents, were analysed to determine the diet of the spotted goatfish. Multivariate analysis and numerical indicators of the diet, such as numerical frequency, frequency of occurrence and weight percentage, were computed to evaluate the diet composition. The mean trophic position was defined using both stable isotope ratios and stomach content analysis. The length at first maturity for the species was determined as 13.7 cm. A slight pattern in size distribution was observed, with mean size increasing with depth along the shelf. The diet was mainly composed of crustaceans, teleosts and Polychaeta. No clear dietary difference was found between habitat types, water depth or latitude. Both trophic positions estimated by stable isotopes and stomach contents analysis ranged between levels 3 and 4. P. Maculatus was found to be feeding on many rare and infrequent prey items, classifying it as a generalist zoobenthivorous predator, probably due to its efficient search strategy.

TRANSFER EFFICIENCY FROM PRIMARY PRODUCERS TO RUDITAPES PHILIPPINARUM ON AN INTERTIDAL FLAT IN HIROSHIMA BAY, JAPAN

2017 ◽  
Author(s):  
Sosuke Otani ◽  
Sosuke Otani ◽  
Akira Umehara ◽  
Akira Umehara ◽  
Haruka Miyagawa ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Secondary Production ◽  
Isotope Ratios ◽  
Ruditapes Philippinarum ◽  
Transfer Efficiency ◽  
Food Sources ◽  
Stable Isotope Ratios ◽  
Primary Producers ◽  
Nitrogen Stable Isotope ◽  
Carbon And Nitrogen

Fish yields of Ruditapes philippinarum have been decreased and the resources have not yet recovered. It needs to clarify food sources of R. philippinarum, and relationship between primary and secondary production of it. The purpose on this study is to reveal transfer efficiency from primary producers to R. philippinarum and food sources of R. philippinarum. The field investigation was carried out to quantify biomass of R. philippinarum and primary producers on intertidal sand flat at Zigozen beach in Hiroshima Bay, Japan. In particular, photosynthetic rates of primary producers such as Zostera marina, Ulva sp. and microphytobenthos were determined in laboratory experiments. The carbon and nitrogen stable isotope ratios for R. philippinarum and 8 potential food sources (microphytobenthos, MPOM etc) growing in the tidal flat were also measured. In summer 2015, the primary productions of Z. marina, Ulva sp. and microphytobenthos were estimated to be 70.4 kgC/day, 43.4 kgC/day and 2.2 kgC/day, respectively. Secondary production of R. philippinarum was 0.4 kgC/day. Contribution of microphytobenthos to R. philippinarum as food source was 56-76% on the basis of those carbon and nitrogen stable isotope ratios. Transfer efficiency from microphytobenthos to R. philippinarum was estimated to be 10-14%. It was suggested that microphytobenthos might sustain the high secondary production of R. philippinarum, though the primary production of microphytobenthos was about 1/10 compared to other algae.

scholarly journals Stable Isotope Ratios of Herbs and Spices Commonly Used as Herbal Infusions in the Italian Market

ACS Omega ◽  
2021 ◽  
Author(s):  
Purna K. Khatri ◽  
Roberto Larcher ◽  
Federica Camin ◽  
Luca Ziller ◽  
Agostino Tonon ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Italian Market ◽  
Herbal Infusions ◽  
Herbs And Spices

scholarly journals Elemental and Isotopic Characterization of Tobacco from Umbria

Metabolites ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 186
Author(s):  
Luana Bontempo ◽  
Daniela Bertoldi ◽  
Pietro Franceschi ◽  
Fabio Rossi ◽  
Roberto Larcher
Keyword(s):  
Stable Isotope ◽  
Economic Value ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Umbria Region ◽  
Geographical Regions ◽  
Isotopic Characterization ◽  
First Time ◽  
Micro Elements

Umbrian tobacco of the Virginia Bright variety is one of the most appreciated tobaccos in Europe, and one characterized by an excellent yield. In recent years, the Umbria region and local producers have invested in introducing novel practices (for production and processing) focused on environmental, social, and economic sustainability. Due to this, tobacco from Umbria is a leading commodity in the global tobacco industry, and it claims a high economic value. The aim of this study is then to assess if elemental and isotopic compositions can be used to protect the quality and geographical traceability of this particular tobacco. For the first time the characteristic value ranges of the stable isotope ratios of the bio-elements as a whole (δ2H, δ13C, δ15N, δ18O, and δ34S) and of the concentration of 56 macro- and micro-elements are now available, determined in Virginia Bright tobacco produced in two different areas of Italy (Umbria and Veneto), and from other worldwide geographical regions. The ranges of variability of elements and stable isotope ratios had slightly different results, according to the three geographical origins considered. In particular, Umbria samples presented significantly lower content of metals potentially dangerous for human health. The results of this first exploratory work highlight the possibility of characterizing tobacco from Umbria, and suggest widening the scope of the survey throughout Italy and foreign regions, in order to be used to describe the geographical origin of tobacco in general and verify the origin of the products on the market.

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