There were also highly significant differences between the level of matching on different beaches, especially for luminance (interaction between same/different and beach ID: F 12,2614.1 = 77.07, p < 0.001 for colour, and F 12,2617.7 = 34.83, p < 0.001 for luminance JNDs), with fleas on some beaches better at matching their substrate than fleas on other beaches.
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