Abstract Ontogenetic shifts in food preference reduces intraspecific competition as immature individuals eat different types than adults. This diet plasticity could facilitate species’ ability to successfully invade and establish itself a new environment, even when co-occurring with phylogenetically close species. Here, ontogenetic of non-native piranha species (Serrasalmus marginatus) was test...

Multi-tissue trace elements (TEs), C, N concentrations and stable isotopes (δ13C, δ15N) of chick carcasses eggs Adélie Emperor penguins were studied to i) provide reference data before the recent institution Ross Sea Marine Protected Area (Antarctica), ii) conversion factors that allow estimating N, δ13C δ15N in edible tissues from non-edible ones, thus improving use contamination trophic trans...

Terrestrial agricultural activities strongly influence riverine nitrogen (N) dynamics, which is reflected in the δ(15)N of riverine consumer tissues. However, processes within aquatic ecosystems also influence consumer tissue δ(15)N. As aquatic processes become more important terrestrial inputs may become a weaker predictor of consumer tissue δ(15)N. In a previous study, this terrestrial-consum...

Bioindicators are useful for determining nutrient regimes in marine environments, but their ability to evaluate corals reefs different ecological states is poorly understood. The precision, availability and congruency of eight potential bioindicators (brown macroalgae, green turf algae, cyanobacteria, soft corals, zoanthids, sponges, sediment) stable isotopic elemental signatures (δ15N, δ13C, %...

Abstract. The isotopic composition of nitrogen and oxygen in dioxide (NO2) potentially carries a wealth information about the dynamics oxides (NOx = nitric oxide (NO) + NO2) chemistry atmosphere. While isotopes NO2 are subtle indicators NOx emissions chemistry, believed to reflect only O3 / VOC chemical regime different atmospheric environments. In order access this potential tracer tropospheri...

Abstract. Atmospheric nitrate originates from the oxidation of nitrogen oxides (NOx=NO+NO2) and impacts both tropospheric chemistry climate. NOx sources, cycling to formation pathways are poorly constrained in remote marine regions, especially Southern Ocean, where pristine conditions serve as a useful proxy for pre-industrial atmosphere. Here, we measured isotopic composition (δ15N δ18O) atmos...

Abstract. Nitrogen oxides (NOx= nitric oxide (NO) + nitrogen dioxide (NO2)) are important trace gases that affect atmospheric chemistry, air quality, and climate. Contemporary development of NOx emissions inventories is limited by the understanding roles vegetation (net source or net sink), vehicle from gasoline- diesel-powered vehicles, application emission control technologies, accurate verif...

Vegetation cover affects soil organic matter and activity of microorganisms. We investigated the intercropping effect forage cactus with tree legumes on microbial biomass in semi-arid tropic, state Pernambuco, Brazil. assessed following cropping systems: (i) Gliricidia sepium intercropped cv. IPA-Sertânia; (ii) Leucaena leucocephala (iii) Cactus IPA-Sertânia monoculture. Samples were collected ...