Temporal variability in stable isotope ratios of C and N in the vibrissa of captive and wild adult South American sea lions Otaria byronia : More than just diet shifts

2017 ◽  
Vol 33 (4) ◽  
pp. 975-990 ◽  
Author(s):  
Luis Cardona ◽  
Damián Vales ◽  
Alex Aguilar ◽  
Enrique Crespo ◽  
Lisette Zenteno
Keyword(s):  
Stable Isotope ◽  
Temporal Variability ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
South American ◽  
Sea Lions ◽  
C And N ◽  
Diet Shifts

Long-term variation in isotopic baselines and implications for estimating consumer trophic niches

2008 ◽  
Vol 65 (10) ◽  
pp. 2191-2200 ◽  
Author(s):  
Christopher T. Solomon ◽  
Stephen R. Carpenter ◽  
James A. Rusak ◽  
M. Jake Vander Zanden
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Isotope Ratios ◽  
Trophic Niche ◽  
Accurate Estimation ◽  
Stable Isotope Ratios ◽  
Turnover Rates ◽  
C And N ◽  
Trophic Niches

Carbon and nitrogen stable isotope ratios are increasingly used to study long-term food web change. Temporal variation at the base of the food web may impact the accuracy of trophic niche estimates, but data describing interannual baseline variation are limited. We quantified baseline variation over a 23-year period in a north-temperate lake and used a simulation model to examine how this variation might affect consumer trophic niche estimates. Interannual variation in C and N stable isotope ratios was significant for both benthic and pelagic primary consumer baselines. Long-term linear trends and shorter-term autoregressive patterns were apparent in the data. There were no correlations among benthic and pelagic C and N baselines. Simulations demonstrated that error in estimated fish trophic niches, but not bias, increased substantially when sampling of baselines was incomplete. Accurate trophic niche estimates depended more on accurate estimation of baseline time series than on accurate estimation of growth and turnover rates. These results highlight the importance of previous and continued efforts to constrain bias and error in long-term stable isotope food web studies.

scholarly journals Foraging ecology of Mediterranean juvenile loggerhead turtles: insights from C and N stable isotope ratios

2020 ◽  
Vol 167 (3) ◽  
Author(s):  
Julia C. Haywood ◽  
Paolo Casale ◽  
Daniela Freggi ◽  
Wayne J. Fuller ◽  
Brendan J. Godley ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Foraging Ecology ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Loggerhead Turtles ◽  
C And N

scholarly journals Spatial and Temporal Variability of Ice Algal Trophic Markers—With Recommendations about Their Application

2020 ◽  
Vol 8 (9) ◽  
pp. 676
Author(s):  
Eva Leu ◽  
Thomas A. Brown ◽  
Martin Graeve ◽  
Jozef Wiktor ◽  
Clara J. M. Hoppe ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Sea Ice ◽  
Temporal Variability ◽  
Climate Change Impacts ◽  
Isotope Ratios ◽  
Arctic Sea Ice ◽  
Stable Isotope Ratios ◽  
Spatial And Temporal Variability ◽  
Web Studies ◽  
The Impact

Assessing the relative importance of sea ice algal-based production is often vital for studies about climate change impacts on Arctic marine ecosystems. Several types of lipid biomarkers and stable isotope ratios are widely used for tracing sea ic-associated (sympagic) vs. pelagic particulate organic matter (POM) in marine food webs. However, there has been limited understanding about the plasticity of these compounds in space and time, which constrains the robustness of some of those approaches. Furthermore, some of the markers are compromised by not being unambiguously specific for sea ice algae, whereas others might only be produced by a small sub-group of species. We analyzed fatty acids, highly branched isoprenoids (HBIs), stable isotope ratios of particulate organic carbon (POC) (δ13C), as well as δ13C of selected fatty acid markers during an Arctic sea ice algal bloom, focusing on spatial and temporal variability. We found remarkable differences between these approaches and show that inferences about bloom characteristics might even be contradictory between markers. The impact of environmental factors as causes of this considerable variability is highlighted and explained. We emphasize that awareness and, in some cases, caution is required when using lipid and stable isotope markers as tracers in food web studies and offer recommendations for the proper application of these valuable approaches.

Influence of the Danube River inputs on C and N stable isotope ratios of the Romanian coastal waters and sediment (Black Sea)

2007 ◽  
Vol 54 (9) ◽  
pp. 1385-1394 ◽  
Author(s):  
Daniela Bănaru ◽  
Mireille Harmelin-Vivien ◽  
Marian-Traian Gomoiu ◽  
Teodora-Maria Onciu
Keyword(s):  
Stable Isotope ◽  
Black Sea ◽  
Coastal Waters ◽  
Isotope Ratios ◽  
Danube River ◽  
Stable Isotope Ratios ◽  
The Danube River ◽  
C And N
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