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

Ometto, Jean Pierre Henry Balbaud; Ehleringer, James R.; Domingues, Tomas F.; Ishida, Françoise Yoko; Mazzi, Edmar A.; Higuchi, Níro; Flanagan, Lawrence B.; Nardoto, Gabriela Bielefeld; Martinelli, Luiz Antônio

doi:10.1007/978-1-4020-5517-1_12

Cited by 57 publications

(108 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Although mean staple food and mean total diet plants have similar δ N values, which is consistent with previous studies on tropical forest ecosystems (70,71). While represented by only a single sample, the very positive δ 13 C value of fungus falls within the range of previously reported saprotrophic fungi δ 13 C values and is more positive than cultivated representatives of the genus by only 1-2‰ (72,73).…”

supporting

confidence: 90%

Detecting intraannual dietary variability in wild mountain gorillas by stable isotope analysis of feces

Blumenthal

Chritz²,

Rothman

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

We use stable isotope ratios in feces of wild mountain gorillas (Gorilla beringei) to test the hypothesis that diet shifts within a single year, as measured by dry mass intake, can be recovered. Isotopic separation of staple foods indicates that intraannual changes in the isotopic composition of feces reflect shifts in diet. Fruits are isotopically distinct compared with other staple foods, and peaks in fecal δ 13 C values are interpreted as periods of increased fruit feeding. Bayesian mixing model results demonstrate that, although the timing of these diet shifts match observational data, the modeled increase in proportional fruit feeding does not capture the full shift. Variation in the isotopic and nutritional composition of gorilla foods is largely independent, highlighting the difficulty for estimating nutritional intake with stable isotopes. Our results demonstrate the potential value of fecal sampling for quantifying short-term, intraindividual dietary variability in primates and other animals with high temporal resolution even when the diet is composed of C 3 plants.C3 photosynthesis | feeding ecology | great apes | Uganda

show abstract

supporting

confidence: 90%

Detecting intraannual dietary variability in wild mountain gorillas by stable isotope analysis of feces

Blumenthal

Chritz²,

Rothman

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…Increased incidence of landslides in the Andes during the months leading up to April, i.e., the Amazon rainy season, would increase the input of high altitude 13 C-enriched POC from these tributaries to Óbidos (Clark et al, 2013;Clark et al, 2016). The higher N:C of POC in this sampling month would also imply that these sources are more degraded (Ometto et al, 2006;Cleveland and Liptzin, 2007), consistent with lower bulk and RPO gas fraction F m values observed for the Solimões and Madeira river samples. Thus, we posit that preferential transport of the more degraded pools of this Andean soil source to Óbidos would explain the both more degraded and 13 C-enriched signatures of POC observed in April (Feng et al, 2016;Mayorga et al, 2005).…”

Section: Radiocarbon Distribution Of Poc Flux At óBidossupporting

confidence: 64%

Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles

Rosengard¹

2017

View full text Add to dashboard Cite

Particulate organic carbon (POC) in the ocean and mobilized by rivers on land transfers ~0.1% of global primary productivity to the deep ocean sediments. This small fraction regulates the long-term carbon cycle by removing carbon dioxide from the atmosphere for centuries to millennia. This thesis investigates mechanisms of POC transfer to the deep ocean by analyzing particles collected in transit through two globally significant carbon reservoirs: the Southern Ocean and the Amazon River Basin. These endeavors test the hypothesis that organic matter composition controls the recycling and transfer efficiency of POC to the deep ocean, and illustrate new applications for ramped pyrolysis/oxidation (RPO), a growing method of POC characterization by thermal stability. By coupling RPO to stable and radiocarbon isotope analyses of riverine POC, I quantify three thermally distinct soil organic carbon pools mobilized by the Amazon River, and evaluate the degradability and fate of these different pools during transport to the coastal Atlantic Ocean. More directly, RPO analyses of marine samples suggest that POC transfer in the water column is in fact selective. Observations of consistent biomolecular changes that accompany transport of phytoplankton-derived organic matter to depth across the Southern Ocean support the argument for preferential degradation of specific POC pools in the water column. Combining discussions of POC recycling and transfer across both marine and terrestrial systems offer new perspectives of thermal stability as a proxy for diagenetic stability and POC degradation state. The challenges of interpreting RPO data in these two environments set the stage for applying the technique to more controlled experiments that trace POC from source to long-term sink.

show abstract

“…2 for focal ant genera). N isotope values are reported using delta notation (d 15 N) where: (Scheu and Falca, 2000;Ometto et al, 2006;Hyodo et al, 2010), l was 1 (the trophic level of the organisms used to estimate the base, i.e., autotrophs), d 15 N secondary consumer was directly measured, and we used the standard 3.4& enrichment per trophic level as our DN (Fry, 1988;Post, 2002).…”

Section: Trophic Positionmentioning

confidence: 99%

Short-term sodium inputs attract microbi-detritivores and their predators

Clay

Yanoviak

Kaspari

2014

Soil Biology and Biochemistry

View full text Add to dashboard Cite

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

Cited by 57 publications

References 71 publications

Detecting intraannual dietary variability in wild mountain gorillas by stable isotope analysis of feces

Detecting intraannual dietary variability in wild mountain gorillas by stable isotope analysis of feces

Novel analytical strategies for tracing the organic carbon cycle in marine and riverine particles

Short-term sodium inputs attract microbi-detritivores and their predators

Contact Info

Product

Resources

About