Fig. 1

Mean mating frequency (number of mating pairs) and egg viability (Experiment 1). A We measured the egg viability at two different time-points post cold shock. Under the cold shock condition, both FSB and FCB populations had extremely low egg viability (~ 1.3%) of 0–6 h of measurement compared to 24–30 h of measurement or with no shock of 0–6 h and 24–30 h period of egg viability measurement. However, there was no significant difference in the egg viability measured 0–6 h for cold shock or no shock treatment between the FSB and FCB populations. Post cold shock, 24–30 h of egg viability had improved about 30–68% compared to egg viability of 0–6 h. Post cold shock, 24–30 h of egg viability was significantly different between FSB and FCB, FSB populations had higher egg viability ~ 2.27 times higher than FCB populations suggesting that the FSB population recovered faster than FCB population post cold shock. B Selections had significant effects on the number of mating pairs. Post cold shock, FSB populations had a roughly double number of mating pairs compared to the FCB populations. Treatment had significant effects on the mean number of mating pairs compared to no shock treatment, indicating that cold shock treatment had a significantly higher number of mating pairs than no shock treatment. The light gray box plot represents the FCB, and the dark gray box plot represents the FSB populations