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Courtship intensity and targeting. The proportion of males that are (a) actively courting and, if courting, (b) targeting the receptive female over a 20 min time course when the environment consists of one receptive and five unreceptive females (n = 29–32 males per population). Means (±s.e.) are depicted for monogamous (blue squares) and polygamous (red triangles) selection regimes. (Online version in colour.)
