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. 2015 Jun 11;5:11197. doi: 10.1038/srep11197

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Seasonal switch to reproductive diapause in A) D. montana (strains 3OL8, 26OL8 and 175OJ8), B) D. littoralis (strains 202OJ8, 219J8 and 280OJ8) and C) D. ezoana (strains 67OJ8, 124OJ8 and 143OJ8) females (order of the strains as listed here). The proportion of diapausing females increased sharply in all three species in photoperiods shorter than 20:4LD. The critical day length (CDL), where the proportion of the females entering to reproductive diapause exceeded 50%, was 19:5LD in all species and strains.