Yurista, P.M., 1997. Bythotrephes cederstroemi Diapausing Egg Distribution and Abundance in Lake Michigan and the Environmental Cues for Breaking Diapause, Murray State University.

Reprinted from Journal of Great Lakes Research (1997) 23(2): 202-209

Abstract:
Bythotrephes diapausing eggs found in the sediments of Lake Michigan ranged in density from less then 100 m(-2) in shallow waters (20 m) to densities over 5,000 m(-2) in offshore waters (>60 m). The density of diapausing eggs was observed to increase with depth of the water column and is probably the result of higher input from greater adult abundance in off-shore waters. Temperature and photoperiod are environmental cues that are known to affect the time and success in hatching of diapausing eggs in many species. An increase in temperature above the storage temperature (4 degrees C) was found to increase the success of hatching Bythotrephes diapausing eggs and shorten the incipient time to hatching, however, all temperature treatments had an equivalent effect on success implying that the cue is discrete and occurs close to 4 degrees C. The onset of maximum hatching rate following the cue to break diapause was dependent on temperature, which is the probable result of development rate being a function of temperature. Length of photoperiod did not have a significant effect on the hatching success or development time of Bythotrephes diapausing eggs, unlike past observations for the cladoceran Daphnia. 

Entire Paper
Contact: P.M. Yurista, Murray State University, Murray, KY 42071
Keywords: Bythotrephes, Basic_biology
Product Type: Research, Basic_biology
User Type: General