Coercive mating, fluctuating asymmetry and male mating success in the dung fly Sepsis cynipsea
Coercive mating, fluctuating asymmetry and male mating success in the dung fly Sepsis cynipsea
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DOI：
10.1006/anbe.1996.0218
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发表时间：
1996-10-01
期刊：
影响因子：
2.5
通讯作者：
Simmons, LW
中科院分区：
文献类型：
--
作者：
Allen, GR;Simmons, LW
粪蝇Sepsis cynipsea（L.）（双翅目：Sepsidae）交配前的配偶警卫通过登上女性的背部在她到达粪便。在完成产卵后，雌性离开粪便并大力摇晃以试图驱逐守卫的雄性。只有成功留在雌性背上的雄性才能建立生殖器接触和交配。雄性比雌性小，在守卫时会用翅膀夹（每只前腿的股骨和胫骨上的特殊修饰区域）夹住雌性的翅膀基部。在交配的三个阶段（挣扎前、挣扎中和交配中），测量了雄性和雌性的优势。在三个阶段中，雄性和雌性的前胫骨尺寸没有差异，但是，雄性前胫骨的绝对波动不对称性在不同阶段之间存在显著差异。平均而言，在copula配对的男性是最对称的，而那些配对之前的斗争是最不对称的。得出的结论是，男性更对称foretiabies间接选择为配偶的女性，因为他们更好的竞争能力，抓住女性的翅膀基地，从而保持在一个苦苦挣扎的女性的背部守卫。(C)1996年动物行为研究协会
Males of the dung fly Sepsis cynipsea (L.) (Diptera: Sepsidae) mate guard before copulation by mounting the female's dorsum upon her arrival at the dung. After completing oviposition, females walk off the dung and vigorously shake to attempt to dislodge the guarding male. Only males that succeed in remaining on the female's dorsum will establish genital contact and copulate. Males are smaller than females, and engage wing clamps (specially modified areas on the femur and tibia of each foreleg) to grip the female's wing bases during guarding. The foretibiae of males and females collected at three phases of pairing (prior to struggling, during struggling and in copula) were measured. No differences in the foretibia size of either males or females across the three phases were found. However, the absolute fluctuating asymmetry of the foretibiae of males differed significantly between phases. On average, males paired in copula were the most symmetrical whilst those paired prior to struggling were the least symmetrical. It was concluded that males with more symmetrical foretibiae are indirectly selected as mates by females because of their better competitive ability to grip the female's wing bases and thereby remain on the dorsum of a struggling female during guarding. (C) 1996 The Association for the Study of Animal Behaviour