scholarly journals Mercury concentrations and stable isotope ratios (δ13C and δ15N) in pelagic nekton assemblages of the south-western Indian Ocean

2022 ◽  
Vol 174 ◽  
pp. 113151
Author(s):  
Pavanee Annasawmy ◽  
David Point ◽  
Evgeny V. Romanov ◽  
Nathalie Bodin
Keyword(s):  
Stable Isotope ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
The South ◽  
Δ13c And Δ15n ◽  
Pelagic Nekton

scholarly journals Seasonal Variation in Stable Isotope Ratios of Cow Milk in Vilnius Region, Lithuania

Animals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 69 ◽  
Author(s):  
Andrius Garbaras ◽  
Raminta Skipitytė ◽  
Justina Šapolaitė ◽  
Žilvinas Ežerinskis ◽  
Vidmantas Remeikis
Keyword(s):  
Stable Isotope ◽  
Dairy Products ◽  
Geographic Origin ◽  
Isotope Ratios ◽  
Food Sources ◽  
Cow Milk ◽  
Ratio Method ◽  
Stable Isotope Ratios ◽  
Δ13c And Δ15n ◽  
Artesian Water

Various studies have shown that stable isotope analysis has the potential to verify the geographic origin of foods and drinks. However, stable isotope composition is not always constant in the environment and can even change in the same area. Dairy products are of particular interest as a group of foods that play an important role in feeding the population. The composition of milk is fundamentally dependent on the feeding of the cows, and thereby on a particular environment. To better understand the amount of variation in δ18O, δ13C, and δ15N values in the milk from the same area, we measured stable isotope ratios in cow milk water, artesian water, and precipitation (δ18O) as well as in bulk milk samples (δ13C and δ15N) collected in 2014–2016. Different water and food sources were available during the winter (artesian water only and dry grass) and summer (artesian water and fresh grass), and spring and autumn seasons reflected transitional periods. Oxygen stable isotope ratios in milk water were relatively lower in winter and transitional seasons and higher in summer, showing the dependence on the main water source. δ13C values reflected particular food sources. This study shows the applicability of the stable isotope ratio method in linking cow milk to specific environments and reveals the amount of variation in stable isotope ratios in the same area. These results could be valuable for other studies on geographical origin determination of dairy products.

Pet or pest? Stable isotope methods for the early detection of invasive alien species

2019 ◽  
Author(s):  
Katherine G W Hill ◽  
Kristine Nielson ◽  
Jonathan J Tyler ◽  
Francesca A McInerney ◽  
Zoe A Doubleday ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Alien Species ◽  
Best Practice ◽  
Invasive Alien Species ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Δ13c And Δ15n ◽  
Isotope Technique ◽  
Practice Methods ◽  
Stable Isotope Technique

The illegal pet trade facilitates the global dispersal of invasive alien species (IAS), providing opportunities for new pests to establish in novel recipient environments. Despite the increasing threat of IAS to the environment and economy, biosecurity efforts often lack suitable, scientifically-based methods to make effective management decisions; such as identifying an established IAS population from a single incursion event. We present a new application of a stable isotope technique to identify wild and captive histories of an invasive pet species. Twelve red-eared slider turtles (Trachemys scripta elegans) from Australian incursions with putative wild and captive origins were analyzed to: (1) present best-practice methods for sampling T.s.elegans incursions; (2) effectively discriminate between wild and captive groups using stable isotope ratios; and (3) present a framework to expand the methodology for use on other IAS species. A sampling method was developed to obtain carbon (δ13C‰) and nitrogen (δ15N‰) stable isotope ratios from the keratin layer of the carapace (shells), which identify differences in dietary plant material and trophic level respectively. Both δ13C‰ and δ15N‰ exhibited the potential to distinguish between the wild and captive origins of the samples. Power simulations demonstrated that isotope ratios were consistent across the carapace, and a minimum of 8 individuals were required to effectively discriminate wild and captive groups, reducing overall sampling costs. Statistical classification effectively separated captive and wild groups by δ15N‰ (captive: δ15N‰ ≥ 9.7‰, minimum of 96% accuracy), which suggested that captive individuals consumed greater proportions of terrestrial meat than wild individuals. This study outlines a practical and accessible method for detecting IAS incursions, providing biosecurity staff and decision makers with the tools to quickly identify and manage future IAS incursions.

scholarly journals Reflection of stable isotopes and selected elements with the inundation gradient at the Matang Mangrove Forest Reserve (MMFR), Malaysia

2017 ◽  
Vol 19 (3) ◽  
pp. 1-10
Author(s):  
W. R. Khan ◽  
M. Nazre ◽  
S. Z. Zulkifli ◽  
K. A. Kudus ◽  
M. Zimmer ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Mangrove Forest ◽  
Isotope Ratio Mass Spectrometry ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Mangrove Species ◽  
Forest Reserve ◽  
Δ13c And Δ15n ◽  
Elemental Concentrations ◽  
Rhizophora Apiculata

Multi-elemental and isotopic fingerprints could help to track changes in mangrove forest productivity and development. This study aims to identify elemental concentrations and stable isotope ratios in inter- and intra-mangrove species along the inundation gradient of the Matang mangrove forest. Matured sun leaves of different mangrove species, namely, Avicennia alba, Rhizophora apiculata, Bruguiera parviflora, and Sonneratia ovata, were collected from the Matang Mangrove Forest Reserve (MMFR). After samples preparation, determination of elemental concentrations and stable isotope ratios were carried out using an Atomic Absorption Spectrometer (AAS) and Isotope Ratio Mass Spectrometry (IRMS) respectively. Trace elements (Mn, Fe, Cu, Zn), cations (Na, K, Ca, Mg) and stable isotope (δ13C and δ15N) ratios were found to follow different patterns along the inundation gradient in the leaves of the sampled plant species. Elemental concentrations of Na, K, Fe, Cu, Zn and Mn along with stable istopic ratio differed significantly within similar and different mangrove species. The results of Rhizophora apiculata elemental concentrations and stable isotope ratios can potentially serve as a baseline to further the research in the MMFR compartments.

scholarly journals Stable isotope patterns of mesopelagic communities over two shallow seamounts of the south-western Indian Ocean

2020 ◽  
Vol 176 ◽  
pp. 104804 ◽  
Author(s):  
Pavanee Annasawmy ◽  
Yves Cherel ◽  
Evgeny V. Romanov ◽  
François Le Loc'h ◽  
Frédéric Ménard ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Indian Ocean ◽  
Western Indian Ocean ◽  
The South

Trace elements and stable isotope ratios (δ13C and δ15N) in fish from deep-waters of the Sulu Sea and the Celebes Sea

2010 ◽  
Vol 60 (9) ◽  
pp. 1560-1570 ◽  
Author(s):  
Kwadwo Ansong Asante ◽  
Tetsuro Agusa ◽  
Reiji Kubota ◽  
Hiroko Mochizuki ◽  
Karri Ramu ◽  
...  
Keyword(s):  
Trace Elements ◽  
Stable Isotope ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Δ13c And Δ15n ◽  
Sulu Sea ◽  
Deep Waters

scholarly journals Carbon and nitrogen dynamics in the coastal Japan Sea inferred from 15 years of measurements of stable isotope ratios of Calanus sinicus

2021 ◽  
Author(s):  
Ken-ichi Nakamura ◽  
Atsushi Nishimoto ◽  
Saori Yasui-Tamura ◽  
Yoichi Kogure ◽  
Misato Nakae ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Japan Sea ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Interannual Variations ◽  
Calanus Sinicus ◽  
Δ13c And Δ15n ◽  
Δ13c Values ◽  
Carbon And Nitrogen ◽  
The Japan Sea

Abstract. Human activities have caused sometimes dramatic changes to the marine environment globally and locally during the last half century. We hypothesized that the carbon and nitrogen stable isotope ratios (δ13C and δ15N) of the copepod Calanus sinicus, one of the dominant secondary producers of North Pacific coastal waters, would record anthropogenic impacts on the coastal environment of the Japan Sea. We monitored these isotope ratios during the spring at four stations in the Japan Sea from 2006 to 2020. The δ13C values ranged from −24.7 ‰ to −15.0 ‰ and decreased from the spring bloom (February/March) to the post-bloom (June/July). This monthly variation was attributed to changes in both the physiology of C. sinicus and phytoplankton δ13C. The negative correlation between the δ13C values of C. sinicus and their carbon:nitrogen ratios reflected lipid accumulation by the copepods; high δ13C values were associated with high sea surface chlorophyll a concentrations. The δ15N values ranged from 2.8 ‰ to 8.8 ‰. The tendency of the δ15N values to increase from the bloom to post-bloom was attributable to an increase of the δ15N of the phytoplankton associated with nitrate depletion and Rayleigh fractionation. These monthly changes were synchronized among the four stations, but δ13C and δ15N differed significantly between stations. Interannual variations were statistically significant, but there were no significant monotonic trends. Interannual variations differed between δ13C and δ15N as well as among stations. These results suggest that local conditions rather than global-scale trends were the primary determinants of elemental cycles in this coastal ecosystem.

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