Sexual behaviour of immature male eastern mosquitofish: a ... - CPRG

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sexual behaviour of immature male mosquitofish 731 Table III. Effect of precocious sexual experience on the efficiency of copulatory attempts of adult males (mean numbers.d.) n Ratio between male T.L. and females T.L. (mm) Copulatory attempts Successful copulatory attempts Frequency of successful copulatory attempts (%) Naïve males 15 0·620·039 136·4626·53 7·263·71 5·492·8 Experienced males 15 0·630·040 75·7333·95 4·061·33 6·012·5 d.f.=9, 130; P
No. of females Successful copulatory attempts (%) 10 7.5 5.0 2.5 0.0 0–10 min P < 0.05 N.S. N.S. N.S. 10–20 min 20–30 min Fig. 1. Frequency of successful gonopodial thrusts (mean with 1 s.d.) of males with precocious sexual experience () compared with that of males grown in the absence of females (). Table IV. Effect of sex ratio during male development on the body size (means.d.) No. of immatures tested T.L. of adults (mm) T.L. of immature (mm) Total length increase Large male Small male Stage 1 to 2 Stage 10 (%) 1 19 24·852·66 22·122·05 17·482·08 25·862·21 49·418·8 4 16 25·002·51 21·781·47 17·681·57 23·951·57 35·912·9 Table V. Mean number (s.d.) of aggressive interactions with adult males, of copulatory attempts, and of time spent in the same sector where at least an adult male was also present for immature males in different sex ratio conditions Adult sex ratio M:F 732 a. bisazza et al. No. of females No. of replicates Attacks by adults EFFECT OF THE SEX RATIO EXPERIENCED BY IMMATURE MALES ON THEIR SIZE AT MATURITY (Tables IV and V) Immature males that grew in aquaria with a low sex ratio increased on average their body size at maturation by about 35% of their original size. Males that grew in aquaria with a high sex ratio increased their size by about 50%; the Total Aggressive interactions Time spent Attacks by immature Total with adult male(s) Copulatory attempts 2 : 1 1 19 41·726·4 6·211·5 47·924·0 26·410·2 3·6 5·2 1 : 2 4 16 37·923·3 8·713·9 46·626·6 20·710·1 13·111·7 Immature males used for this experiment were at stages 5 and 6 of their gonopodium maturation.
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