Hoikkala Anneli, Aspi Jouni
Department of Genetics, University of Oulu, SF-90570, Oulu, Finland.
Evolution. 1993 Jun;47(3):768-777. doi: 10.1111/j.1558-5646.1993.tb01232.x.
We examined sexual selection by Drosophila littoralis, D. montana, and D. ezoana females on male courtship sounds to determine whether the females use absolute or relative criteria when choosing their mates. Behavior of the females was observed, when they were courted by a single male producing normal sounds, or by a single wing-manipulated male producing abnormal sounds; and when they were courted by one or both of these males in a choice situation. The females usually accepted short-winged (but not wingless) males producing abnormal sounds, if they had no alternatives. However, if they heard the sound produced by a normal male, they rejected the deficient male. Drosophila littoralis and D. ezoana females selected between two wing-manipulated males with different wing areas. Our results suggest that the females choose their mates on the basis of relative criteria if the signals emitted by the courting males are within the range of acceptable cues.
我们研究了海滨果蝇、蒙塔纳果蝇和北海道果蝇的雌性对雄性求偶声音的性选择，以确定雌性在选择配偶时是使用绝对标准还是相对标准。观察了雌性在被发出正常声音的单个雄性求偶时、被通过翅膀操控发出异常声音的单个雄性求偶时，以及在选择情境中被这两种雄性中的一种或两种求偶时的行为。如果没有其他选择，雌性通常会接受发出异常声音的短翅（但不是无翅）雄性。然而，如果它们听到正常雄性发出的声音，就会拒绝有缺陷的雄性。海滨果蝇和北海道果蝇的雌性在两个翅膀面积不同、通过翅膀操控的雄性之间进行选择。我们的结果表明，如果求偶雄性发出的信号在可接受线索范围内，雌性会根据相对标准选择配偶。
