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11. Global Patterns of Foliar Nitrogen Isotopes and Their Relationships with Climate, Mycorrhizal Fungi, Foliar Nutrient Concentrations, and Nitrogen Availability

Author

Craine, Joseph M., Elmore, Andrew J., Aidar, Marcos P. M., Bustamante, Mercedes, Dawson, Todd E., Hobbie, Erik A., Kahmen, Ansgar, Mack, Michelle C., McLauchlan, Kendra K., Michelsen, Anders, Nardoto, Gabriela B., Pardo, Linda H., Peñuelas, Josep, Reich, Peter B., Schuur, Edward A. G., Stock, William D., Templer, Pamela H., Virginia, Ross A., Welker, Jeffrey M., and Wright, Ian J.

Published
2009
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14. LT‐Brazil: A database of leaf traits across biomes and vegetation types in Brazil

Author

Mariano, Eduardo, primary, Gomes, Taciana F., additional, Lins, Silvia R. M., additional, Abdalla‐Filho, Adibe L., additional, Soltangheisi, Amin, additional, Araújo, Maria G. S., additional, Almeida, Rodrigo F., additional, Augusto, Fernanda G., additional, Canisares, Luiza P., additional, Chaves, Siglea S. F., additional, Costa, Cristiane F. G., additional, Diniz‐Reis, Thaís R., additional, Galera, Leonardo A., additional, Martinez, Melissa G., additional, Morais, Maristela C., additional, Perez, Elen B., additional, Reis, Lucas C., additional, P. Simon, Carla, additional, Mardegan, Silvia F., additional, Domingues, Tomas F., additional, Miatto, Raquel C., additional, Oliveira, Rafael S., additional, Reis, Carla R. G., additional, Nardoto, Gabriela B., additional, Kattge, Jens, additional, Martinelli, Luiz A., additional, and Hampe, Arndt, additional

Published
2021
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15. Partitioning of Environmental and Taxonomic Controls on Brazilian Foliar Content of Carbon and Nitrogen and Stable Isotopes

Author

Martinelli, Luiz A., primary, Abdalla-Filho, Adibe L., additional, Gomes, Taciana F., additional, Lins, Silvia R. M., additional, Mariano, Eduardo, additional, Soltangheisi, Amin, additional, de Camargo, Plinio B., additional, Vieira, Simone A., additional, Higuchi, Niro, additional, and Nardoto, Gabriela B., additional

Published
2021
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16. A feather hydrogen (δ2H) isoscape for Brazil.

Author

Alquezar, Renata D., Costa, Fabio J. V., Sena-Souza, João Paulo, Nardoto, Gabriela B., and Hobson, Keith A.

Subjects
FEATHERS, HYDROGEN isotopes, STABLE isotopes, SOLAR radiation, RANDOM forest algorithms, FORENSIC sciences
Abstract

Spatial patterns of stable isotopes in animal tissues or "isoscapes" can be used to investigate animal origins in a range of ecological and forensic investigations. Here, we developed a feather hydrogen isotope (δ2Hf) isoscape for Brazil based on 192 samples of feathers from the family Thraupidae from scientific collections. Raw values of δ2Hf ranged from -107.3 to +5.0‰, with higher values at the Caatinga biome (northeast Brazil) and lower values at the Amazon and Pantanal. A Random Forest (RF) method was used to model the spatial surface, using a range of environmental data as auxiliary variables. The RF model indicated a negative relationship between δ2Hf and Mean Annual Precipitation, Precipitation in the Warmest Quarter, and Annual Temperature Range and positive relationships for amount-weighted February-April precipitation δ2H (δ2Hp(Feb-April)) and Mean Annual Solar Radiation. Modelled δ2Hf values ranged from -85.7 to -13.6‰. Ours is the first δ2Hf isoscape for Brazil that can greatly assist our understanding of both ecological and biogeochemical processes controlling spatial variation in δ2H for this region. This isoscape can be used with caution, due to its poor predictive power (as found in other tropical regions) and can benefit from new sample input, new GNIP data, ecological and physiological studies, and keratin standard material better encompassing the range in feather samples from Brazil. So, we encourage new attempts to build more precise feather H isoscapes, as well as isoscapes based on other elements. [ABSTRACT FROM AUTHOR]

Published
2022
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17. Carbon and Beyond: The Biogeochemistry of Climate in a Rapidly Changing Amazon

Author

Covey, Kristofer, primary, Soper, Fiona, additional, Pangala, Sunitha, additional, Bernardino, Angelo, additional, Pagliaro, Zoe, additional, Basso, Luana, additional, Cassol, Henrique, additional, Fearnside, Philip, additional, Navarrete, Diego, additional, Novoa, Sidney, additional, Sawakuchi, Henrique, additional, Lovejoy, Thomas, additional, Marengo, Jose, additional, Peres, Carlos A., additional, Baillie, Jonathan, additional, Bernasconi, Paula, additional, Camargo, Jose, additional, Freitas, Carolina, additional, Hoffman, Bruce, additional, Nardoto, Gabriela B., additional, Nobre, Ismael, additional, Mayorga, Juan, additional, Mesquita, Rita, additional, Pavan, Silvia, additional, Pinto, Flavia, additional, Rocha, Flavia, additional, de Assis Mello, Ricardo, additional, Thuault, Alice, additional, Bahl, Alexis Anne, additional, and Elmore, Aurora, additional

Published
2021
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19. Recuperation of nitrogen cycling in Amazonian forests following agricultural abandonment

Author

Davidson, Eric A., de Carvalho, Claudio J. Reis, Figueira, Adelaine Michela, Ishida, Francoise Yoko, Ometto, Jean Pierre H. B., Nardoto, Gabriela B., Saba, Renata Tuma, Hayashi, Sanae N., Leal, Eliane C., Vieira, Ima Celia G., and Martinelli, Luiz A.

Subjects
Nitrogen cycle -- Research, Forest ecology -- Research, Nitrification -- Research, Phosphorus in the body -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation, Research
Abstract

Author(s): Eric A. Davidson (corresponding author) [1]; Cláudio J. Reis de Carvalho [2]; Adelaine Michela Figueira [3]; Françoise Yoko Ishida [3]; Jean Pierre H. B. Ometto [3]; Gabriela B. Nardoto [...]

Published
2007
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20. Geographical patterns of human diet derived from stable-isotope analysis of fingernails

Author

Nardoto, Gabriela B., Silva, Steven, Kendall, Carol, Ehleringer, James R., Chesson, Lesley A., Ferraz, Epaminondas S.B., Moreira, Marcelo Z., Ometto, Jean P.H.B., and Martinelli, Luiz A.

Subjects
Diet -- Analysis, Diet -- Demographic aspects, Fingernails -- Analysis, Anthropology/archeology/folklore
Abstract

Carbon and nitrogen isotope ratios of human fingernails were measured in 490 individuals in the western US and 273 individuals in southeastern Brazil living in urban areas, and 53 individuals living in a moderately isolated area in the central Amazon region of Brazil and consuming mostly locally grown foods. In addition, we measured the carbon and nitrogen isotope ratios of common food items to assess the extent to which these isotopic signatures remain distinct for people eating both omnivorous and vegetarian diets and living in different parts of the world, and the extent to which dietary information can be interpreted from these analyses. Fingernail [[delta].sup.13]C values (mean [+ or -] standard deviation) were -15.4 [+ or -] 1.0 and -18.8 [+ or -] 0.8[per thousand] and [[delta].sup.15]N values were 10.4 [+ or -] 0.7 and 9.4 [+ or -] 0.6[per thousand] for southeastern Brazil and western US populations, respectively. Despite opportunities for a 'global supermarket' effect to swamp out carbon and nitrogen isotope ratios in these two urbanized regions of the world, differences in the fingernail isotope ratios between southeastern Brazil and western US populations persisted, and appeared to be more associated with regional agricultural and animal production practices. Omnivores and vegetarians from Brazil and the US were isotopically distinct, both within and between regions. In a comparison of fingernails of individuals from an urban city and isolated communities in the Amazonian region, the urban region was similar to southeastern Brazil, whereas individuals from isolated nonurban communities showed distinctive isotopic values consistent with their diets and with the isotopic values of local foods. Although there is a tendency for a 'global supermarket' diet, carbon and nitrogen isotopes of human fingernails hold dietary information directly related to both food sources and dietary practices in a region. KEY WORDS carbon; food; human nail; isotope ratios; nitrogen

Published
2006

22. Nitrogen flows and fate in urban landscapes

Author

Svirejeva-Hopkins, Anastasia, primary, Reis, Stefan, additional, Magid, Jakob, additional, Nardoto, Gabriela B., additional, Barles, Sabine, additional, Bouwman, Alexander F., additional, Erzi, Ipek, additional, Kousoulidou, Marina, additional, Howard, Clare M., additional, and Sutton, Mark A., additional

Published
2011
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23. Mapping carbon and nitrogen isotopic composition of fingernails to demonstrate a rural–urban nutrition transition in the Center‐West , Northeast, and Amazon regions of Brazil

Author

Nardoto, Gabriela B., primary, da Silva, Rodrigo J., additional, Schor, Tatiana, additional, Garavello, Maria Elisa P. E., additional, Silva, Marcia Regina F., additional, Rodrigues, Lívia P. F., additional, Murrieta, Rui Sergio S., additional, Camilo, Ellen A., additional, Reinaldo, Emanoella D. F., additional, Aquino, Fernanda C., additional, Silva, Estéfano A., additional, Camargo, Plinio B., additional, Moreira, Marcelo Z., additional, Mazzi, Edmar A., additional, Duarte‐Neto, Paulo José, additional, and Martinelli, Luiz Antonio, additional

Published
2020
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25. Carbon and Nitrogen Isotope Ratios of Food and Beverage in Brazil

Author

Martinelli, Luiz A., primary, Nardoto, Gabriela B., additional, Perez, Maria A. Z., additional, Junior, Geraldo Arruda, additional, Fracassi, Fabiana C., additional, Oliveira, Juliana G. G., additional, Ottani, Isadora S., additional, Lima, Sarah H., additional, Mazzi, Edmar A., additional, Gomes, Taciana F., additional, Soltangheisi, Amin, additional, Filho, Adibe L. Abdalla, additional, Mariano, Eduardo, additional, Costa, Fabio J. V., additional, Duarte-Neto, Paulo J., additional, Moreira, Marcelo Z., additional, and Camargo, Plinio B., additional

Published
2020
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29. Consequences of removal of exotic species (eucalyptus) on carbon and nitrogen cycles in the soil-plant system in a secondary tropical Atlantic forest in Brazil with a dual-isotope approach.

Author

Carvalho Teixeira, Milena, Pierre Vitória, Angela, de Rezende, Carlos Eduardo, de Almeida, Marcelo Gomes, and Nardoto, Gabriela B.

Subjects
EUCALYPTUS, NITROGEN cycle, TROPICAL forests, INTRODUCED species, CARBON cycle, HUMUS, FOREST soils, SOIL dynamics
Abstract

The impact of exotic species on heterogeneous native tropical forest requires the understanding on which temporal and spatial scales these processes take place. Functional tracers such as carbon (δ13C) and nitrogen (δ15N) isotopic composition in the soil-plant system might help track the alterations induced by the exotic species. Thus, we assess the effects from the removal of the exotic species eucalyptus (Corymbia cytriodora) in an Atlantic forest Reserve, and eucalyptus removal on the alteration of the nutrient dynamics (carbon and nitrogen). The hypotheses were: (1) the eucalyptus permanence time altered δ13C and δ15N in leaves, soils and litter fractions (leaves, wood, flowers + fruits, and rest); and (2) eucalyptus removal furthered decomposition process of the soil organic matter. Hence, we determined the soil granulometry, the δ13C and δ15N in leaves, in the superficial soil layer, and litter in three sites: a secondary forest in the Atlantic forest, and other two sites where eucalyptus had been removed in different times: 12 and 3 months ago (M12 and M3, respectively). Litter samples presented intermediate δ13C and δ15N values in comparison with leaves and soil. In the M3, the greater δ13C values in both litter rest fraction and soil indicate the presence, cycling and soil incorporation of C, coming from the C4 photosynthesis of grassy species (Poaceae). In the secondary forest, the soil δ15N values were twice higher, compared with the eucalyptus removal sites, revealing the negative influence from these exotic species upon the ecosystem N dynamics. In the M12, the leaves presented higher δ13C mean value and lower δ15N values, compared with those from the other sites. The difference of δ13C values in the litter fractions regarding the soil led to a greater fractioning of 13C in all sites, except the flower + fruit fractions in the secondary forest, and the rest fraction in the M3 site. We conclude that the permanence of this exotic species and the eucalyptus removal have altered the C and N isotopic and elemental compositions in the soil-plant system. Our results suggest there was organic matter decomposition in all litter fractions and in all sites. However, a greater organic matter decomposition process was observed in the M3 soil, possibly because of a more intense recent input of vegetal material, as well as the presence of grassy, easily-decomposing herbaceous species, only in this site. Therefore, the dual-isotope approach generated a more integrated picture of the impact on the ecosystem after removing eucalyptus in this secondary Atlantic forest, and could be regarded as an option for future eucalyptus removal studies. [ABSTRACT FROM AUTHOR]

Published
2020
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31. Convergence of soil nitrogen isotopes across global climate gradients

Author

Craine, Joseph M., primary, Elmore, Andrew J., additional, Wang, Lixin, additional, Augusto, Laurent, additional, Baisden, W. Troy, additional, Brookshire, E. N. J., additional, Cramer, Michael D., additional, Hasselquist, Niles J., additional, Hobbie, Erik A., additional, Kahmen, Ansgar, additional, Koba, Keisuke, additional, Kranabetter, J. Marty, additional, Mack, Michelle C., additional, Marin-Spiotta, Erika, additional, Mayor, Jordan R., additional, McLauchlan, Kendra K., additional, Michelsen, Anders, additional, Nardoto, Gabriela B., additional, Oliveira, Rafael S., additional, Perakis, Steven S., additional, Peri, Pablo L., additional, Quesada, Carlos A., additional, Richter, Andreas, additional, Schipper, Louis A., additional, Stevenson, Bryan A., additional, Turner, Benjamin L., additional, Viani, Ricardo A. G., additional, Wanek, Wolfgang, additional, and Zeller, Bernd, additional

Published
2015
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34. Basin-wide variations in Amazon forest nitrogen-cycling characteristics as inferred from plant and soil15N:14N measurements

Author

Nardoto, Gabriela B., primary, Quesada, Carlos A., additional, Patiño, Sandra, additional, Saiz, Gustavo, additional, Baker, Tim R., additional, Schwarz, Michael, additional, Schrodt, Franziska, additional, Feldpausch, Ted R., additional, Domingues, Tomas F., additional, Marimon, Beatriz S., additional, Marimon Junior, Ben-Hur, additional, Vieira, Ima C.G., additional, Silveira, Marcos, additional, Bird, Michael I., additional, Phillips, Oliver L., additional, Lloyd, Jon, additional, and Martinelli, Luiz A., additional

Published
2013
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35. On the delineation of tropical vegetation types with an emphasis on forest/savanna transitions

Author

Torello-Raventos, Mireia, primary, Feldpausch, Ted R., additional, Veenendaal, Elmar, additional, Schrodt, Franziska, additional, Saiz, Gustavo, additional, Domingues, Tomas F., additional, Djagbletey, Gloria, additional, Ford, Andrew, additional, Kemp, Jeanette, additional, Marimon, Beatriz S., additional, Hur Marimon Junior, Ben, additional, Lenza, Eddie, additional, Ratter, James A., additional, Maracahipes, Leandro, additional, Sasaki, Denise, additional, Sonké, Bonaventure, additional, Zapfack, Louis, additional, Taedoumg, Hermann, additional, Villarroel, Daniel, additional, Schwarz, Michael, additional, Quesada, Carlos A., additional, Yoko Ishida, F., additional, Nardoto, Gabriela B., additional, Affum-Baffoe, Kofi, additional, Arroyo, Luzmilla, additional, M.J.S. Bowman, David, additional, Compaore, Halidou, additional, Davies, Kalu, additional, Diallo, Adama, additional, Fyllas, Nikolaos M., additional, Gilpin, Martin, additional, Hien, Fidèle, additional, Johnson, Michelle, additional, Killeen, Timothy J., additional, Metcalfe, Daniel, additional, Miranda, Heloisa S., additional, Steininger, Mark, additional, Thomson, John, additional, Sykora, Karle, additional, Mougin, Eric, additional, Hiernaux, Pierre, additional, Bird, Michael I., additional, Grace, John, additional, Lewis, Simon L., additional, Phillips, Oliver L., additional, and Lloyd, Jon, additional

Published
2013
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36. Frozen chicken for wild fish: Nutritional transition in the Brazilian Amazon region determined by carbon and nitrogen stable isotope ratios in fingernails

Author

Nardoto, Gabriela B., primary, Murrieta, Rui Sergio S., additional, Prates, Luís Enrique G., additional, Adams, Cristina, additional, Garavello, Maria Elisa P.E., additional, Schor, Tatiana, additional, De Moraes, André, additional, Rinaldi, Fernando D., additional, Gragnani, Juliana G., additional, Moura, Edila A.F., additional, Duarte‐Neto, Paulo J., additional, and Martinelli, Luiz A., additional

Published
2011
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39. The stable carbon and nitrogen isotopic composition of vegetation in tropical forests of the Amazon Basin, Brazil.

Author

Howarth, Robert W., Ometto, Jean P. H. B., Ehleringer, James R., Domingues, Tomas F., Berry, Joseph A., Ishida, Françoise Y., Mazzi, Edmar, Higuchi, Niro, Flanagan, Lawrence B., Nardoto, Gabriela B., and Martinelli, Luiz A.

Abstract

Here we present the within-site, seasonal, and interannual variations of the carbon (δ13C) and nitrogen (δ15N) isotope ratios of leaves, wood, bark and litter from four sites in the Amazon region, Brazil. Samples were collected in Manaus (3° 06′07″ S; 60°01′30″ W), Ji-Paraná (10°53′07″ S; 61°57′06″ W), and Santarém (2°26′35″ S; 54°42′30″ W) with mean annual precipitation of 2207, 2040 and 1909 mm respectively. The overall average for all leaf samples was−32.3 ± 2.5‰ for δ13C and +5.8 ± 1.6‰ for δ15N (n = 756). The leaf δ values at these sites were often but not always statistically distinct from each other. The d13C values varied from−37.8‰ to−25.9‰ Pronounced differences in δ13C values occurred with height associated with differences in forest structure. The δ13C of leaf dry matter showed seasonal variations associated with the length of the dry season, despite the fact that total annual precipitation was similar among the studied sites. Leaf δ15N values ranged from+0.9‰ to a maximum value of+10.9‰, and the Santarém sites showed more enriched values than Manaus and Ji-Paraná sites. No seasonal variation was detected in the δ15N of leaves, but significant differences were observed among sites and with changes in canopy height. The isotope ratio data are consistent with our current understanding of the roles of light, water availability, and recycling of soil-respired CO2 influences on δ13C and consistent with our understanding that an open nitrogen cycle can lead to high δ15N values despite a significant number of legumes in the vegetation. [ABSTRACT FROM AUTHOR]

Published
2006
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40. Basin-wide variations in Amazon forest nitrogen-cycling characteristics as inferred from plant and soil N: N measurements.

Author

Nardoto, Gabriela B., Quesada, Carlos A., Patiño, Sandra, Saiz, Gustavo, Baker, Tim R., Schwarz, Michael, Schrodt, Franziska, Feldpausch, Ted R., Domingues, Tomas F., Marimon, Beatriz S., Marimon Junior, Ben-Hur, Vieira, Ima C.G., Silveira, Marcos, Bird, Michael I., Phillips, Oliver L., Lloyd, Jon, and Martinelli, Luiz A.

Subjects
*NITROGEN cycle, *CLIMATE change, *LEGUMES, *FOREST canopies, *EFFECT of phosphorus on plants, *NITROGEN fixation, *FOREST soils
Abstract

Background:Patterns in tropical forest nitrogen cycling are poorly understood. In particular, the extent to which leguminous trees in these forests fix nitrogen is unclear. Aims:We aimed to determine factors that explain variation in foliar δ15N (δ15NF) for Amazon forest trees, and to evaluate the extent to which putatively N2-fixing Fabaceae acquire nitrogen from the atmosphere. Methods:Upper-canopy δ15NFvalues were determined for 1255 trees sampled across 65 Amazon forest plots. Along with plot inventory data, differences in δ15NFbetween nodule-forming Fabaceae and other trees were used to estimate the extent of N2fixation. Results:δ15NFranged from −12.1‰ to +9.3‰. Most of this variation was attributable to site-specific conditions, with extractable soil phosphorus and dry-season precipitation having strong influences, suggesting a restricted availability of nitrogen on both young and old soils and/or at low precipitation. Fabaceae constituted fewer than 10% of the sampled trees, and only 36% were expressed fixers. We estimated an average Amazon forest symbiotic fixation rate of 3 kg N ha−1year−1. Conclusion:Plant δ15N indicate that low levels of nitrogen availability are only likely to influence Amazon forest function on immature or old weathered soils and/or where dry-season precipitation is low. Most Fabaceae species that are capable of nodulating do not fix nitrogen in Amazonia. [ABSTRACT FROM PUBLISHER]

Published
2014
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42. Nitrogen flows and fate in urban landscapes

Author

Anastasia Svirejeva-Hopkins, Stefan Reis, Jakob Magid, Nardoto, Gabriela B., Sabine Barles, Bouwman, Alexander F., Ipek Erzi, Marina Kousoulidou, Howard, Clare M., and Sutton, Mark A.

43. Convergence of soil nitrogen isotopes across global climate gradients

Author

Craine, Joseph M., Elmore, Andrew J., Wang, Lixin, Augusto, Laurent, Baisden, W. Troy, Brookshire, E. N. J., Cramer, Michael D., Hasselquist, Niles J., Hobbie, Erik A., Kahmen, Ansgar, Koba, Keisuke, Kranabetter, J. Marty, Mack, Michelle C., Marin-Spiotta, Erika, Mayor, Jordan R., McLauchlan, Kendra K., Michelsen, Anders, Nardoto, Gabriela B., Oliveira, Rafael S., Perakis, Steven S., Peri, Pablo L., Quesada, Carlos A., Richter, Andreas, Schipper, Louis A., Stevenson, Bryan A., Turner, Benjamin L., Viani, Ricardo A. G., Wanek, Wolfgang, and Zeller, Bernd

Subjects
2. Zero hunger, 13. Climate action, 15. Life on land, 6. Clean water

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