Ecological and isotopic discrimination of syntopic rodents in a neotropical rain forest of French Guiana

2003 ◽  
Vol 19 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Jean-François Mauffrey ◽  
François Catzeflis
Keyword(s):  
Stable Isotopes ◽  
Isotopic Composition ◽  
Rain Forest ◽  
French Guiana ◽  
Ecological Studies ◽  
Carbon Isotope Ratios ◽  
Photosynthetic Pathways ◽  
Feeding Process ◽  
Neotropical Rain Forest

Stable isotopes are commonly used in ecological studies to infer food resources (Ambrose & DeNiro 1986, Bocherens et al. 1990,1991,1994;Yoshinaga et al. 1991) since isotopic composition is conserved during the feeding process. Moreover,for herbivorous (sensu lato) species, it is often possible to identify the main resource because different photosynthetic pathways generate different values of carbon isotope ratios (Park & Epstein 1961, Sternberg et al. 1984). This allows the characterization of broad biota such as savannas or forest and discrimination of grazers from sympatric folivorous species (DeNiro & Epstein 1978).

Tracing dietary protein in red-backed voles (Clethrionomys gapperi) using stable isotopes of nitrogen and carbon

2005 ◽  
Vol 83 (5) ◽  
pp. 717-725 ◽  
Author(s):  
David T.J Sare ◽  
John S Millar ◽  
Frederick J Longstaffe
Keyword(s):  
Stable Isotopes ◽  
Isotopic Composition ◽  
Small Mammal ◽  
Dietary Protein ◽  
Diet Composition ◽  
Isotopic Fractionation ◽  
Bone Collagen ◽  
Carbon Isotope Ratios ◽  
Dietary Nitrogen ◽  
Protein Levels

We examined the stable isotopes of nitrogen and carbon in a small mammal, the red-backed vole (Clethroinomys gapperi (Vigors, 1830)), to determine if isotope signatures reflect diet composition. Nitrogen- and carbon-isotope ratios in tissues from voles maintained on different protein levels in the laboratory were compared with wild-trapped voles. The isotopic fractionation of dietary nitrogen and carbon was also examined as food was digested in the stomach, incorporated into bone collagen, bioapatite, and hair, and excreted as feces. Nitrogen and carbon isotopes were fractionated differently depending on the isotopic composition and protein content of the diet. δ15N and δ13C values appear to be influenced by factors in addition to diet, such as macronutrients metabolized for respiration, metabolic rate, and periods of protein shortage.

scholarly journals Characterization of the isotopic composition and bulk ion deposition of precipitation from Central to West Hawaiʻi Island between 2017 and 2019

2021 ◽  
Vol 34 ◽  
pp. 100786
Author(s):  
Diamond K. Tachera ◽  
Nicole C. Lautze ◽  
Giuseppe Torri ◽  
Donald M. Thomas
Keyword(s):  
Isotopic Composition ◽  
Ion Deposition

Diversity and vertical distribution of epiphytic liverworts in lowland rain forest and lowland cloud forest of French Guiana

2013 ◽  
Vol 35 (4) ◽  
pp. 243-254 ◽  
Author(s):  
Christine Gehrig-Downie ◽  
André Obregon ◽  
Jörg Bendix ◽  
Robbert Gradstein
Keyword(s):  
Vertical Distribution ◽  
Rain Forest ◽  
French Guiana ◽  
Cloud Forest ◽  
Lowland Rain Forest

CHARACTERIZATION OF NITROGEN AND CARBON STABLE ISOTOPES IN EPIPHYTIC FORAMINIFERAL MORPHOTYPES

2016 ◽  
Vol 46 (3) ◽  
pp. 271-284 ◽  
Author(s):  
Guillem Mateu-Vicens ◽  
Teresa Sebastián ◽  
Anna Khokhlova ◽  
Maria del Mar Leza ◽  
Salud Deudero
Keyword(s):  
Stable Isotopes ◽  
Carbon Stable Isotopes

Life History Diversity of Canopy and Emergent Trees in a Neotropical Rain Forest

1992 ◽  
Vol 62 (3) ◽  
pp. 315-344 ◽  
Author(s):  
Deborah A. Clark ◽  
David B. Clark
Keyword(s):  
Life History ◽  
Rain Forest ◽  
Neotropical Rain Forest

Characterization of late Campanian and Maastrichtian planktonic foraminiferal depth habitats and vital activities based on stable isotopes

2003 ◽  
Vol 202 (1-2) ◽  
pp. 1-29 ◽  
Author(s):  
Sigal Abramovich ◽  
Gerta Keller ◽  
Doris Stüben ◽  
Zsolt Berner
Keyword(s):  
Stable Isotopes

Using stable isotopes to estimate the time since disconnection of pools in temporary rivers 

2021 ◽  
Author(s):  
Pilar Llorens ◽  
Sebastián González ◽  
Jérôme Latron ◽  
Cesc Múrria ◽  
Núria Bonada ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Isotopic Composition ◽  
River Flow ◽  
Meteorological Data ◽  
Global Network ◽  
Balance Model ◽  
Water Volume ◽  
Ecological Quality ◽  
Temporary Rivers ◽  
Hydrological Variable

<p>Temporary rivers, characterized by shifts between flowing water, disconnected pools and dry periods, represent over 50% of the world’s river network and future climatic projections suggest their increase. These rivers are understudied, especially when only disconnected pools remain, because gauging stations or hydrological models do not inform of what happens after the cessation of flow. In addition, most of biological indicators for water quality are designed for flowing waters and their adequacy for temporary rivers is uncertain.</p><p>The development of biological metrics adequate for the assessment of disconnected pools is difficult, because the high species replacement during and following flow cessation. For this reason, one hydrological variable of paramount importance for the assessment of ecological quality of disconected pools is the time since disconnection from the river flow.</p><p>The objective of our work is to present a methodology to estimate the time since disconnection of pools from the river flow. This methodology, following the Gonfiantini (1986) model, is based on the sampling of water stable isotopes in disconnected pools. For pools disconnected from the groundwater, knowing the isotopic modification of the water in time due to evaporation, allows to estimate the relative volume of water evaporated since the pool has been disconnected. However, this approach gets complicated when pools have relevant rainfall inputs or exchanges with groundwater.</p><p>Within the Vallcebre research area (42º12’N and 1º49’E), two artificial pools, one covered with a transparent lid to prevent the input of rainfall and another uncovered, were installed to validate this methodology in controlled conditions. From July to November 2020, water volume of these pools were weekly measured and sampled for isotopic analysis. In parallel, meteorological variables were monitored and rainfall was also sampled for water stable isotopes.</p><p>To develop and validate an operational methodology for estimating the time since disconnection, we first calculated the relative amount of evaporated water based on the variations of isotopic composition of the covered pool samples, and estimated the time since disconnection (for a given natural pool) using the potential evaporation calculated from the meteorological data. For the uncovered pool, the information of amount and isotopic composition of rainfall was added in a mass balance model. Additionally, the same estimations were calculated with standard information (i.e. the meteorological data obtained from the National Meteorological Service and precipitation isotopes data from the Global Network of Isotopes in Precipitation (GNIP) of the International Atomic Energy Agency). Finally, measured volumes changes in pools, were used to assess the limitations of the operational methodology and the sensitivity of the results to meteorological conditions.</p><p>Our approach suggests that changes in isotopic composition can be a reliable method to estimate time since disconnection of pools in temporary rivers to better assess their ecological quality.</p>

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