| selection for high diapause incidence in blow flies (calliphora vicina) maintained under long days increases the maternal critical daylength: some consequences for the photoperiodic clock. | using a population of calliphora vicina from southern scotland (55 degrees n), showing a critical day length for maternal induction of diapause of about 14.5 h per day, strains of flies were selected for a high incidence of larval diapause under long day length (ld 16:8 h). diapause incidence was raised from under 10% to almost 100% within five or six generations. the selected flies showed an increase in their critical day length to over 16 h per day, and a high incidence of larval diapause unde ... | 2003 | 12880658 |