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Association time (mean±s.e.) of female X. birchmanni with computer animations of conspecific (black bars) and heterospecific X. malinche (white bars) males. ‘Humic acid’ indicates trials conducted in 200 mg l−1 HA; ‘Control’ represents trials conducted without supplemental humic acid. Asterisks indicate a significant preference for conspecific cues over heterospecific: *p<0.05; **p<0.01.
