Field-acclimated Drosophila suzukii (Diptera: Drosophilidae) from the Saguenay–Lac-Saint-Jean region, Québec, Canada, were examined over two years for winter survival, under the hypothesis that flies select protected overwintering microhabitats. In 2016–2017, flies trapped alive in the field or emerged from infested fruits were submitted to four winter regimes of either constant or daily fluctuating temperatures of 5 °C (2–8 °C) or 10 °C (7–13 °C). In 2017–2018, two fluctuating regimes averaging either 1 °C (–2 to 4 °C) or 3 °C (0–6 °C) were tested. Survival was modelled using Cox proportional hazard models testing probability that mortality risk varies with cold winter regime, fly sex, and fly provenance. Hazard ratios were about 1.7 times higher for males than for females. Models indicate that flies in constant and fluctuating 10 °C, in constant 5 °C, or in fluctuating 1 °C with daily exposure to –2 °C would not survive a six-month winter. Female survival extended to the next summer in fluctuating regimes averaging 5 °C or 3 °C. Estimates of 0.95 quantile survival (5%) indicate that overwintering D. suzukii experiencing such cold temperature regimes during winter, with no prolonged sub-zero temperatures, could survive until July of the following year, which is likely at the high population densities observed.

田间驯养的果蝇铃木根据苍蝇选择受保护的越冬微生境的假说，研究了加拿大魁北克萨格奈–拉克-圣让地区（双翅目：果蝇科）的冬季生存期，为期两年。在2016–2017年，被困在田间或从受侵染果实中飞出的苍蝇被置于四个冬季​​条件下，其恒定温度或每日波动温度为5°C（2–8°C）或10°C（7–13°C） ）。在2017–2018年，测试了两种平均温度波动范围为1°C（–2至4°C）或3°C（0–6°C）的波动方案。使用Cox比例风险模型对生存率进行建模，以测试死亡风险随寒冷的冬季，苍蝇性别和苍蝇种源而变化的可能性。男性的危险比大约是女性的1.7倍。模型表明，苍蝇在恒定且波动10°C，恒定5°C，或在每天暴露于–2°C的情况下波动1°C将无法在六个月的冬季中生存。在平均温度为5°C或3°C的波动状态下，女性的生存期延长至次年夏天。估计的0.95分位数生存率（5％）表明越冬铃木D.suzukii在冬季经历这种寒冷的温度，没有长时间低于零的温度，可以生存到第二年的七月，这可能是由于观察到的高人口密度所致。