Discussion
Lavens & Sorgeloos (1987) present a general model of
the relationship between incubation temperature and
hatching for cysts of Artemia. The results presented
here suggest their model probably has general applicability for all members of the order Anostraca. The
shape of the hatching curve will, of course, change in
species specific ways as shown by the hatching studies
presented in Belk (1977). The portion of their model that will require the most refinement is the region
of 'reversible interruption' of diapause. Their model accords well with the situation presented here for
T. platyurus where the cysts simply remain dormant at
low temperature and initiate development leading to
hatching once placed in a thermal environment favorable to eclosion. However, the results for B. lindahli
introduce the element of exposure time as a factor altering the future readiness of the cysts to end diapause
and hatch without the intervention of dehydration to
in effect reestablish a state of readiness to terminate
diapause.
181
Acknowledgments
We thank Dr Dallas Weaver for his generous gift of
several large jars of Thamnocephalus platyurus eggs.
They have proved a valuable research resource in severallaboratories.
References
Belk, D., 1977. Zoogeography of the Arizona fairy shrimps (Crustacea:Anostraca). Arizona Acad. Sci. 12: 70-78.
Lavens, P. & P. Sorge\oos, 1987. The cryptobiotic state of Artemia
cysts, its diapause deactivation and hatching: a review. In
P. Sorge\oos, D. A. Bengtson, W. Decleir & E. Jaspers (eds),
Artemia Research and its Applications 3: 27-63.