Frequency-dependent Batesian mimicry maintains colour polymorphism in a sea snake population.

This parameter was highly significant for the annual change in relative numbers of melanic snakes (F 1,35 = 27.15, P < 0.0001), intermediate-phase snakes (F 1,35 = 25.01, P < 0.0001), and black-and-white banded snakes (F 1,35 = 38.27, P < 0.0001; see Fig. 4 ).

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A negative binomial model with colour morph and site as factors detected a marginally significant divergence among sites in the relative numbers of each morph (interaction morph*site F 4,122 = 2.46, P = 0.049), with Anse Vata having slightly more black-and-white morphs than did the other sites.

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