Asymmetrical male mandibular horns and mating behavior in Agathidium Panzer (Coleoptera: Leiodidae)
Asymmetrical male mandibular horns and mating behavior in Agathidium Panzer (Coleoptera: Leiodidae)
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DOI：
10.1080/00222930410001708641
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发表时间：
2005-01-01
影响因子：
0.8
通讯作者：
Wheeler, QD
中科院分区：
文献类型：
--
作者：
Miller, KB;Wheeler, QD
一些种的雄鸟在左下颌的背部表面有一个突出的角。喇叭的独特之处在于它是高度不对称的。其中一个物种，A.marae Miller和Wheeler，在额叶的右侧有一个额外的角。角可分为四种形态类型。本文研究了两个物种的标度关系，它们分别是尖角沙参和普氏沙棘。这些物种表现出一种强烈不连续(S型)的标度关系，其中有一个突出的“转换点”。测量数据(前牙宽度对下颌高度)符合非线性回归模型，以确定每个物种种群的转换点和转换点处的斜率。描述了与交配相关的行为和其他行为。雄鱼会用一种顶着头的动作把竞争对手从底物上赶走。以为家的雄性似乎更有能力赶走对手。雌性在交配前和交配后使用头部推举的力度也较小。
Males of some species of Agathidium Panzer have a prominent horn on the dorsal surface of the left mandible. The horn is unique in that it is highly asymmetrical. One species, A. marae Miller and Wheeler, has an additional horn on the right side of the frons. The horns are categorized into four general morphological types. Scaling relationships are investigated for two species, A. angulare Mannerheim and A. pulchrum LeConte. These species exhibit a scaling relationship that is strongly discontinuous (sigmoid) with a prominent "switch point". Measurement data (pronotal width versus mandible height) are fit to a nonlinear regression model to determine the switch points and slopes at the switch points for the populations of each species. Behaviors associated with mating and other behaviors are described for A. pulchrum. Males use a head-thrusting behavior to dislodge rival males from the substrate. Homed males appear better able to dislodge opponents. Head thrusting is also used less vigorously on females before and after mating.