Results 251 to 260 of about 3,969,104 (330)

Tree-ring stable isotopes and growth trajectories reveal early warning signals of drought-induced Scots pine mortality. [PDF]

Tree Physiol
Urban O, Hartl C, Zang C, Pernicová N, Čáslavský J, Treydte K, Schneider L, Trnka M, Esper J, Büntgen U.   +9 more
europepmc   +1 more source

δ¹³C as a Continuum: Tissue-Based, Ontogenetic, and Interspecific Variation in Carbon Sourcing of a Photosymbiotic Bivalve (Subfamily Fraginae). [PDF]

Ecol Evol
Schmidt A, Tan ADY, Li J, Kirkendale L, Li R.   +4 more
europepmc   +1 more source

Reconstruction of paleoenvironments using carbon stable isotopes of specific compounds

Anais da Academia Brasileira de Ciências, 2000
Santos Neto Eugenio V.
doaj  

Sulfur Isotopes Reveal Spatial Variation in Waterbird Trace Element Contamination from Tropical Estuaries to the Open Ocean. [PDF]

Environ Sci Technol
Linhares BA, Bustamante P, Nunes GT, Costa PG, Bugoni L, Zebral YD, Orselli IBM, Martins CMG, Bianchini A.   +8 more
europepmc   +1 more source

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Carbon stable isotopes as indicators of coastal eutrophication.

Ecological Applications, 2014
Coastal ecologists and managers have frequently used nitrogen stable isotopes (δ15N) to trace and monitor sources of anthropogenic nitrogen (N) in coastal ecosystems. However, the interpretation of δ15N data can often be challenging, as the isotope values fractionate substantially due to preferential retention and uptake by biota.
A. Oczkowski, E. Markham, A. Hanson, C. Wigand   +3 more
semanticscholar   +3 more sources

THE GEOCHEMISTRY OF THE STABLE CARBON ISOTOPES

Geochimica et Cosmochimica Acta, 1953
Abstract Several hundred samples of carbon from various geologic sources have been analyzed in a new survey of the variation of the ratio C13/C12 in nature. Mass spectrometric determinations were made on the instruments developed by H. C. Urey and his co-workers utilizing two complete feed systems with magnetic switching to determine small ...
H. Craig
semanticscholar   +2 more sources

Food webs in forest and pasture streams in the Waikato region, New Zealand: A study based on analyses of stable isotopes of carbon and nitrogen, and fish gut contents [PDF]

New Zealand Journal of Marine and Freshwater Research, 1997
Stable isotopes of carbon (C) and nitrogen (N) were studied in 11 stream communities in the Waikato region of New Zealand. From comparisons of mean d13C and d15N values, food webs in the shaded, forest streams were clearly based on allochthonous material
Brendan J. Hicks
exaly   +2 more sources

Forest cover controls the nitrogen and carbon stable isotopes of rivers.

Science of the Total Environment, 2022
Deforestation affects the ecological integrity of rivers and streams, threatening biodiversity and ecosystem services worldwide. However, few studies have strictly analyzed the effect of the functional responses of tropical streams to changes in forest ...
Fausto Machado-Silva, Vinicius Neres‐Lima, Andréa Franco de Oliveira, T. Moulton   +3 more
semanticscholar   +1 more source

Stable carbon isotopes in human tissues

Nature, 1978
ON studying the distribution of 14C from nuclear weapon tests in a wide range of human tissues, it was observed that significant modification of 14C/12C isotopic ratio had occurred, largely as a function of variable carbon renewal rates1,2. As a parallel exercise, 13C/12C isotope ratios have been assayed, 13C and 12C being the nonradioactive isotopes ...
T D, Lyon, M S, Baxter
openaire   +2 more sources

Oxygen and carbon stable isotopes of Mytilus galloprovincialis Lamarck, 1819 shells as environmental and provenance proxies

The Holocene, 2019
Mollusc shell stable isotopes are commonly used to reconstruct past environmental conditions. However, despite being abundant components of natural and anthropogenic fossil accumulations, the geochemical composition of mussel shells (Mytilus spp.) has ...
Stefania Milano, B. Schöne, Igor Gutiérrez-Zugasti   +2 more
semanticscholar   +1 more source