Ontogenetic variation

We determined the shell C and O isotopic composition of the cultured foraminifera, and compared these isotopic values with the water chemistry of the culture chambers, and also with the shell chemistry of field specimens collected from sites on the North Carolina and South Carolina (USA) continental margin. The culmred foraminifera showed substantial offsets from the 8 C of system water dissolved inorganic carbon (—0.5 to —2.5%c, depending on species) and smaller offsets (0 to — 0.5%o) from the predicted 8 0 of calcite in equilibrium with the culture system water at the growth temperature. These offsets reflect at least three factors species-dependent vital effects ontogenetic variations in shell chemistry and the aqueous carbonate chemistry ([COJ] or pH) of the experimental system. 

Hintz, C. J., Shaw, T. J., Bernhard, J. M., Chandler, G. T., McCorkle, D. C. Blanks, J. K. 2006b. Trace/minor elementicalcium ratios in culmred benthic foraminifera. Part U Ontogenetic variation. Geochimica et Cosmochimica Acta, 70, 1964-1976, doi 10.1016/j.gca.2005.12.019. 

Berkov S, Doncheva T, Philipov S, Alexandov K. Ontogenetic variation of the tro-pane alkaloids in Datura stramonium. Biochem Syst Ecol 2005 33(10) 1017-29. 

The intraindividual variation between the plant parts and depending on the developmental stages ( morpho and ontogenetic variation ). 

Intraindividual Variation between Plant Parts and Depending on the Developmental Stage (Morpho- and Ontogenetic Variation)... 

N. hesperis). Ontogenetic variation of the alkaloid profile was observed for N. glauca (Lovkova et al. 1976). Nicotine was the main nicotinoid in 15-day-old seedlings whereas anabasine prevailed in 48-day-old plants. Anatabine turned out to be always a minor component with the exception of N. otophora where it represented the principal alkaloid in the leaves (roots nicotine). 

Ontogenetic Variations. The significance of certain solanaceous taxa as a commercial source of hyoscyamine and scopolamine, respectively, stimulated studies on ontogenetic variations. Thus, in an extensive study roots and stems of Datura stramonium were checked in four different stages of development, as well as leaves, pericarp, and seeds in two different stages each (Berkov et al. 2005). As expected the number and the structural types of tropanes turned out to depend on the stages of development. Due to the very complex alkaloid profile of this species a lot of interesting results could be obtained. 

Mancenido, M.O. and Walley, C.D. (1979) Functional morphology and ontogenetic variation in the Callovian brachiopod Septirhynchia from Tunisia. Palaeontology, 22, 317-337. 

---