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Figure 3


Fig. 3. The reversion scores of (A) 7-day-old, (B) 14-day-old and (C) 21-day-old Holopneustes purpurascens larvae after exposure to 10 µmol l–1 histamine for varying time periods. The reversion score was calculated as the difference between the proportion of larvae that had metamorphosed in SSW, 24 h after commencing the histamine exposure, and the proportion of larvae deemed to have settled during exposure to 10 µmol l–1 histamine before transfer to SSW. Thus, a negative score indicates that a proportion of settled larvae reverted back to swimming larvae after transfer to SSW. A positive score indicates that all settled larvae metamorphosed in SSW along with additional larvae over 24 h. *, not tested; **, all settled larvae metamorphosed.





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