ISSN:
1615-6102
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary Photographic illustration of the several stages in the life cycle ofObelia hydranths, together with a correlation of these with the direction of hydroplasmic streaming within the pedicels is used to demonstrate the significance of the structural changes as expressions of developmental and metabolic activity. When developmental growth induces anabolism, the current of hydroplasmic granules is out into the growing part; when feeding activity provides materials for growth and maintenance, the current is alternately towards and away from the functioning animal; when senility induces catabolism, the current is away from the disintegrating organism as the resolved substance is removed; and when the ground is being prepared for new growth initiation by cytoplasmic reconstitution, there is no current and the hydroplasmic granules are quiescent. Thus there is, as would be expected, positive correlation between the developmental and metabolic activity of the hydranth, and the direction of hydroplasmic streaming within its pedicel.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01603333
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