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Mating behavior and sexual selection in a polygamous beetle

Current Zoology 2013年第2期59卷 257-264页

作者： Wen LU Qiao WANG Mingyi TIAN Jin XU Jian LV Aizhi QIN College of Agriculture Guangxi University Narming 530005 China Institute of Natural Resources Massey University Private Bag 11222 Palmerston North New Zealand College of Natural Resources and Environment South China Agricultural University Guangzhou 510642 China College of Agriculture Yunnan University Kunming 650091 China Library Guangxi University Narming 530005 China

Mating behavior and sexual selection in relation to morphometric traits in a polygamous beetle, Glenea cantor （F.）（Coleoptera： Cerambycidae）, were investigated. Upon encounter, a male approached a female, mounted her, grasped her terminal abdomen with his hind tarsi, and attempted to mate. Successful mating lasted about 3.5 h. Although all traits measured in females and half of traits in males were significantly correlated with mating success, the primary selection on virgin females was the genital trait, thebursa copulatrix length, and that on males was the body length and hind tarsal length. Longer bursa copulatrix accommodated a larger ejaculate, suggesting that this female trait benefits the male that first mates with the female in terms of in- creasing ejaculate size to beat subsequent males in sperm competition. Under a female-biased sex ratio, more than 20% of mat- ings failed within 20s after the male genitalia had been inserted into hers, suggesting that males assess genital features of the re- ：male before insemination and undertake cryptic male mate choice. Larger males were more capable of grasping females and achieving mating. During the premating struggle the male almost always used his hind tarsi to lift the female terminal abdomen to the position for his genitalia to insert, and as a result, males with longer hind tarsi achieved higher mating success [Current Zoolo- gy 59 （2）： 257-264, 2013].

关键词： Bursa Body length Mating behavior Sexual selection tarsal length

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