The role of vegetation in setting strontium stable isotope ratios in the Critical Zone

Feeding niches of riverine and coastal mink (Mustela vison) in southeast Alaska differ in prey composition and abundance and diving medium during spring and summer. In autumn, however, the upstream migration of spawning Pacific salmon (Oncorhynchus sp.) creates a pulse of food for mink. We hypothesized that diets of coastal and riverine mink, and therefore their stable isotope ratios (δ13C, δ15N), would differ significantly during periods when salmon were absent, but that salmon carcasses would constitute a large portion of the diet of both groups during the salmon spawning season. Stable isotope analyses of clotted blood cells from 24 live-captured mink and muscle tissue from 25 mink carcasses were used to indicate the composition of diets of individual mink in 1992 and 1993. These isotope values were then compared with stable isotope ratios of prey, using a multiple-source mixing model. Our results indicate that riverine mink depended on salmon (carcasses and fry), with little seasonal or individual variation, whereas coastal mink relied on intertidal organisms in spring and summer, with measurable (<25%) consumption of salmon carcasses when they became available in autumn. Coastal and riverine mink in southeast Alaska differ strongly in their diets in spring and summer, with both groups relying on the abundant salmon carcasses during autumn.

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Long term observations on stable isotope ratios in rainwater samples from twin stations over Southern India; identifying the role of amount effect, moisture source and rainout during the dual monsoons

Climate Dynamics ◽

10.1007/s00382-018-4552-1 ◽

2018 ◽

Vol 52 (11) ◽

pp. 6893-6907 ◽

Cited By ~ 4

Author(s):

P. Rahul ◽

Prosenjit Ghosh

Keyword(s):

Stable Isotope ◽

Isotope Ratios ◽

Southern India ◽

Stable Isotope Ratios ◽

Moisture Source ◽

Amount Effect

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

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.31519/conferencearticle_5b1b93b4af8c32.73166623 ◽

2017 ◽

Author(s):

Sosuke Otani ◽

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.

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

ACS Omega ◽

10.1021/acsomega.1c00274 ◽

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

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Are stable isotope ratios suitable for describing niche partitioning and individual specialization?

Ecological Applications ◽

10.1002/eap.2392 ◽

2021 ◽

Author(s):

Philip Matich ◽

Joseph J. Bizzarro ◽

Oliver N. Shipley

Keyword(s):

Stable Isotope ◽

Niche Partitioning ◽

Isotope Ratios ◽

Stable Isotope Ratios ◽

Individual Specialization

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Elemental and Isotopic Characterization of Tobacco from Umbria

Metabolites ◽

10.3390/metabo11030186 ◽

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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