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51.
Although stable isotope ratios in animals have often been used as indicators of the trophic level and for the back-calculation of diets, few experiments have been done under standardized laboratory conditions to investigate factors influencing 15N and 13C values. An experiment using Nile tilapia [Oreochromis niloticus (L.)] was therefore carried out to test the effect of different dietary protein contents (35.4, 42.3, and 50.9%) on 15N and 13C values of the whole tilapia. The fish were fed the isoenergetic and isolipidic semi-synthetic diets at a relatively low level. 15N and 13C values of the lipid-free body did not differ between the fish fed the diets with different protein contents, but the trophic shift for N and C isotopes decreased with increasing protein accretion in the individual fish, for N from 6.5 to 4 and for C in the lipid-free body from 4 to 2.5. This is the first study showing the strong influence of the individual protein balance to the degree to which the isotopic signature of dietary protein was modified in tissue protein of fish. The extrapolation of the trophic level or the reconstruction of the diet of an animal from stable isotope ratios without knowledge of the individual physiological condition and the feeding rate may lead to erroneous results. 相似文献
52.
Adeniyi Lateef Adeleke Afon Abel Omoniyi 《Journal of Material Cycles and Waste Management》2022,24(3):1172-1181
Journal of Material Cycles and Waste Management - This research investigates the types and quantity of different components of solid waste produced at Obafemi Awolowo University, Ile-Ife (OAU)... 相似文献
53.
Nega Worku Balew Abel 《Environmental science and pollution research international》2022,29(28):42493-42508
Environmental Science and Pollution Research - The land surface temperature (LST) has been increased worldwide from time to time with the rapid increase of impervious surfaces such as built-up... 相似文献