scholarly journals Estimating turnover rates of carbon and nitrogen in recently metamorphosed winter flounder Pseudopleuronectes americanus with stable isotopes

2002 ◽  
Vol 236 ◽  
pp. 233-240 ◽  
Author(s):  
KL Bosley ◽  
DA Witting ◽  
RC Chambers ◽  
SC Wainright
Keyword(s):  
Stable Isotopes ◽  
Winter Flounder ◽  
Turnover Rates ◽  
Pseudopleuronectes Americanus ◽  
Carbon And Nitrogen

Metabolic protein replacement drives tissue turnover in adult mice

2006 ◽  
Vol 84 (7) ◽  
pp. 992-1002 ◽  
Author(s):  
Lynne S. Arneson ◽  
Stephen MacAvoy ◽  
Ethan Basset
Keyword(s):  
Skeletal Muscle ◽  
Stable Isotopes ◽  
Whole Blood ◽  
Sulfur Isotopes ◽  
Diet Change ◽  
Turnover Rates ◽  
Migration Routes ◽  
Dietary History ◽  
Carbon And Nitrogen ◽  
Adult Mice

Stable isotopes are increasingly being used to examine ecological and physiological questions, such as dietary choices, migration routes and timing, and physiological condition. To address these questions in the field, laboratory experiments must be done to determine diet–tissue discrimination values and turnover rates for stable isotopes in tissues. In this study, we examined the carbon and nitrogen turnover rates of whole blood, skeletal muscle, liver, kidney, heart, and brain, as well as the sulfur turnover rate of whole blood, skeletal muscle, and liver in Mus musculus L., 1758 following a diet change. By examining tissue isotope change in two groups of mice fed different diets, we found that tissues turnover at different rates (in order of fastest to slowest — liver, kidney, heart, brain, whole blood, skeletal muscle), but that carbon, nitrogen, and sulfur isotopes turned over with similar half-lives within a single tissue. By using a diet with different nutrient isotopic values, we also calculated that up to approximately 90%–95% of carbon in newly synthesized tissue was contributed by dietary protein. These results will provide field researchers with additional tissue isotopic half-lives to elucidate dietary history with a greater degree of certainty. The tissue sulfur half-lives provide an extra stable isotope that may be used in situations where carbon and nitrogen values do not differ between old and new nutrient sources.

Metabolic turnover rates of carbon and nitrogen stable isotopes in captive juvenile snakes

2009 ◽  
Vol 23 (2) ◽  
pp. 319-326 ◽  
Author(s):  
Aaron T. Fisk ◽  
Kim Sash ◽  
John Maerz ◽  
William Palmer ◽  
John P. Carroll ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Turnover Rates ◽  
Nitrogen Stable Isotopes ◽  
Carbon And Nitrogen ◽  
Metabolic Turnover

The Winter Flounder (Pseudopleuronectes americanus) in Long Pond, Conception Bay, Newfoundland

1971 ◽  
Vol 28 (8) ◽  
pp. 1153-1165 ◽  
Author(s):  
V. S. Kennedy ◽  
D. H. Steele
Keyword(s):  
Food Intake ◽  
Growth Rates ◽  
Plant Material ◽  
Early Growth ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Food Items ◽  
Fish Remains ◽  
Males And Females ◽  
Conception Bay

Monthly samples of winter flounder taken in Long Pond from November 1962 to October 1963 indicated that the flounder moved into deeper water (7–10 m) during the summer and returned to shallow water (1–2 m) from September to June. These movements corresponded to the end of the spawning season and the ripening of the gonads respectively. Spawning occurred from March until early June, most of it in May and early June. Most males were mature at age 6 and most females at age 7. Fifty percent of the males and females were mature at 21 and 25 cm respectively. The growth rates of the males and females were similar until the age of 8, after which the females apparently outgrew the males. Early growth and fecundity were similar to those reported for other areas. No feeding took place in December or January but the flounder fed in March and continued to feed throughout the summer; food intake decreased in the fall. They were omnivorous and the type of food eaten varied with the locality. Polychaetes, plant material, and molluscs were the most common food items throughout the year. Capelin eggs and fish remains were found only during a few months of the year but were eaten in great quantities.

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