Identifying the sources and transformations of riverine nitrate plays a critical role in mitigating nitrogen enrichment river networks. Several previous studies have used δ18O-NO3− to quantitatively assess contributed by atmospheric terrestrial sources, but their results great uncertainty due wide range values isotopic fractionation during nitrogen-cycling processes environment. The 17O anomaly...

The nitrogen isotopes (δ15N) in the organic fraction of accretionary hard part structures, such as fish otoliths, may provide life histories dietary change. We performed controlled experiments to validate dynamics isotopic signal incorporation into biominerals following shifts and also compared whole-otolith serial sampling approaches for diet reconstruction. Laboratory-reared Atlantic croaker ...

Intensive livestock management impacts forest and trees in different ways. Pig manure is a major source of nitrogen (N) pollution surface ground waters some European regions such as north-eastern Spain, but it understudied how application agroforestry systems. How pig affects tree radial growth the N cycle was assessed by measuring concentrations soil, leaves wood δ15N tree-ring two species wid...

δ13C and δ15N were analyzed in the leaves of Pinus sylvestris L. Betula spp. under conditions severe heavy metal (Zn, Cu, Cd, Pb) contamination. Twenty-seven plots located near Karabash copper smelter (Russia) studied. No reliable correlation 13C tree with level pollution was observed. δ15N, both spp., increased similarly polluted areas. by 2.3‰ needles 1.6‰ compared to background ones. The pro...

The last decade has seen important developments in the use of carotenoid pigments to authenticate pasture-feeding in ruminants. However, dehydrated alfalfa is sometimes incorporated in grain-based concentrates fed to stall-raised lambs, which may affect the reliability of the pasture-feeding authentication methods based on carotenoids in plasma and fat, due to significant residual carotenoid le...

The size of the bioavailable (i.e., “fixed”) nitrogen inventory in the ocean influences global marine productivity and the biological carbon pump. Despite its importance, the pre-industrial rates for the major source and sink terms of the oceanic fixed nitrogen budget, N2 fixation and denitrification, respectively, are not well known. These processes leave distinguishable imprints on the ratio ...

Similar to vehicles on roadways, trains frequently kill wildlife via collisions along railways. Despite the prevalence of this mortality worldwide, little is known about the relative importance of wildlife attractants associated with railways, including spilled agricultural products, enhanced vegetation, invertebrates, and carcasses of rail-killed ungulates. We assessed the relative importance ...

Context Primary production on coral reefs varies under changing conditions such as light and nutrient availability. This variation causes changes in basal stable isotopes photosynthetic pathways change.Aims study provides a preliminary baseline of nitrogen (δ15N) carbon (δ13C) isotope profiles Symbiodinium macroalgae at spatial scale along depth gradient around an island.Methods Coral fragments...