Models to estimate maternal genetic effects for juvenile body
weight in broiler chickens.
Plasticity of juvenile body length, juvenile body depth, and juvenile tailspine length were calculated as the absolute difference in clone mean values in the presence and absence of the extract.
For juvenile body length, variation was found among treatments and for the treatment-clone (G x E) interaction.
We controlled for these confounding effects by calculating average within-clone correlations between life-history traits and juvenile body length, juvenile body depth, or juvenile tailspine length (Table 3).
For each treatment, the average within-clone correlations of life history traits with juvenile body length, juvenile body depth, or juvenile tailspine length are shown.
For both tailspine length and juvenile body length, none of the regression coefficients were statistically significant (Table 4).
pulicaria was characterized by low levels of juvenile body lipid, adult fecundity, and population birth rates (Figs.
pulicaria population growth rates was associated with variation in juvenile body lipid.
Our objective was to examine the food habits of juvenile walleye pollock for evidence of an annual cycle and to elucidate how these food habits may vary regionally in relation to previously observed geographic variation in juvenile body
condition and growth rate.
The episphere continues to recede, and the dorsal levators contract and pull the apical organ toward the esophagus until it becomes attached to the juvenile body
Data on molluscan embryogenesis and cell lineage suggest that the trochophore-like stage of molluscs is little more than a ciliated gastrula when it first forms and the juvenile body differentiates from this as development progresses through the veliger stage.
Results of an important study on the neomeniomorph Epimenia babai (Okusu, 2002), when compared to observations on species with a more typical test-cell larva, corroborate an early interpretation of the test as an expanded pretrochal area and prototroch of a trochophore-like form, with the juvenile body developing from more vegetal (posterior) blastomeres of the embryo.
The remainder of the gastrula gives rise to the juvenile body, which may or may not spend a transient period as a planktonic veliger.
If larvae of extant molluscs represent a body plan that is qualitatively different from that of the juvenile body because it predates the bilaterally symmetric benthic stage, then collinear expression of Hox genes should not occur during early stages of molluscan larval development.
Alternatively, the intercalation hypothesis suggests that the plankton-to-benthos transition requires little body remodeling because, from the outset, development has built a juvenile body along with transient larval structures to allow swimming and, in some cases, feeding.