Effects of temperature on isotopic enrichment inDaphnia magna: implications for aquatic food-web studies

2003 ◽  
Vol 17 (14) ◽  
pp. 1619-1625 ◽  
Author(s):  
M. Power ◽  
K. R. R. A. Guiguer ◽  
D. R. Barton
Keyword(s):  
Food Web ◽  
Isotopic Enrichment ◽  
Aquatic Food Web ◽  
Web Studies ◽  
Effects Of Temperature ◽  
Aquatic Food

Dynamics of bacteria–substrate stable isotope separation: dependence on substrate availability and implications for aquatic food web studies

2008 ◽  
Vol 65 (9) ◽  
pp. 1983-1990 ◽  
Author(s):  
Daryl J. McGoldrick ◽  
David R. Barton ◽  
Michael Power ◽  
Ryan W. Scott ◽  
Barbara J. Butler
Keyword(s):  
Food Web ◽  
Exponential Growth Phase ◽  
Substrate Availability ◽  
Aquatic Food Web ◽  
Fish Food ◽  
Web Studies ◽  
Isotopic Signatures ◽  
C And N ◽  
Isotopic Separation ◽  
Aquatic Food

Heterotrophic bacteria growing without substrate limitation discriminate against the heavier stable isotopes of C and N, which is reflected in the isotopic signatures of consumers of bacteria. We measured bacteria and substrate isotopic separation (C and N) during glucose and ammonium uptake by three strains of bacteria ( Pseudomonas putida , Bacillus megaterium , and Enterobacter aerogenes ) grown in batch culture at 4 and 30 °C. Isotopic separation between bacteria and substrate was dependent on substrate availability. Higher discrimination against the heavier isotopes, and therefore more depleted δ13C and δ15N values of bacterial biomass, were observed during the exponential growth phase when the nutrient supply was in excess of the demand. We also compared the isotopic ratios of Chironomus tentans grown on aged macrophyte detritus and commercial fish food. Isotopic signatures of Chironomus larvae grown on fish food were within the ranges typical of one trophic step, whereas larvae grown on detritus were strongly depleted in13C, suggesting assimilation of bacteria that had grown on the C-rich detritus. Our results are consistent with the very few other studies of bacterial fractionation of nonlimiting nutrients and may also explain the frequent observation of unexpectedly depleted isotopic signatures in aquatic food web studies.

Assigning hydrogen, carbon, and nitrogen isotope values for phytoplankton and terrestrial detritus in aquatic food web studies

Inland Waters ◽  
2014 ◽  
Vol 4 (2) ◽  
pp. 233-242 ◽  
Author(s):  
Carol Yang ◽  
Grace Wilkinson ◽  
Jonathan Cole ◽  
Stephen Macko ◽  
Michael Pace
Keyword(s):  
Food Web ◽  
Nitrogen Isotope ◽  
Aquatic Food Web ◽  
Web Studies ◽  
Carbon And Nitrogen ◽  
Aquatic Food

scholarly journals Modeling vitamin B1 transfer to consumers in the aquatic food web

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
M. J. Ejsmond ◽  
N. Blackburn ◽  
E. Fridolfsson ◽  
P. Haecky ◽  
A. Andersson ◽  
...  
Keyword(s):  
Food Web ◽  
Vitamin B1 ◽  
Aquatic Food Web ◽  
Aquatic Food

scholarly journals The influence of fish cage culture on δ13C and δ15N of filter-feeding Bivalvia (Mollusca)

2013 ◽  
Vol 73 (4) ◽  
pp. 743-746
Author(s):  
E. Benedito ◽  
L. Figueroa ◽  
A.M Takeda ◽  
GI. Manetta
Keyword(s):  
Food Web ◽  
Native Species ◽  
Corbicula Fluminea ◽  
Cage Culture ◽  
Aquatic Food Web ◽  
Δ13c And Δ15n ◽  
Value Analysis ◽  
Fine Powders ◽  
Before And After ◽  
Aquatic Food

The objective of this study was to evaluate the effect of Oreochromis niloticus cage culture promoted variations in the δ13C and δ15N in Corbicula fluminea (Mollusca; Bivalvia) and in the sediment of an aquatic food web. Samples were taken before and after net cage installation in the Rosana Reservoir (Paranapanema River, PR-SP). Samples of specimens of the bivalve filterer C. fluminea and samples of sediment were collected using a modified Petersen grab. All samples were dried in an oven (60 °C) for 72 hours, macerated to obtain homogenous fine powders and sent for carbon (δ13C) and nitrogen (δ15N) isotopic value analysis in a mass spectrometer. There were significant differences in the δ13C and δ15N values of the invertebrate C. fluminea between the beginning and the end of the experiment. There were no differences between the δ13C and δ15N values of sediment. These results indicate that the installation of fish cage culture promoted impacts in the isotopic composition of the aquatic food web organisms, which could exert influence over the native species and the ecosystem.

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