As illustrated in Figure 1, death was synchronous between all ramets in 7 of 11 colonies (Y8, 275jjr, 403d, 386i, 433z, 435h, 360c), occurring within the same blastogenic cycle.
These changes resulted in the near-simultaneous death of a genet following a given number of blastogenic cycles.
In nonsenescent colonies, ampullae serve as reservoirs for pigment cells during takeover, and thus accumulate within them only during this phase of the blastogenic cycle (Lauzon et al.
In some instances, the onset of senescence was also observed during the takeover phase of the blastogenic cycle.
Histological studies have previously been carried out on nonsenescent zooids during blastogenic growth (Lauzon et al.
4c) not seen in nonsenescent colonies during blastogenic growth (Fig.
During nonrandom senescence, specific parental colonies and their subcloned ramets died within a defined period of time, often within the same blastogenic cycle.
1992) have revealed the existence of a weekly, synchronized cycle of asexual development and regression, known as the blastogenic cycle, which concludes with massive visceral apoptosis (Lauzon et al.
The observation that ramets often die simultaneously within the same blastogenic cycle, months following their separation, further validates this hypothesis.