Spermatophore Quality and Production in two Heliconius Butterflies with Contrasting Mating Systems
Spermatophore Quality and Production in two Heliconius Butterflies with Contrasting Mating Systems
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两种具有对比交配系统的 Heliconius 蝴蝶的精囊质量和产量
DOI：
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发表时间：
2015
影响因子：
1
通讯作者：
Emmanuelle S. Silva
中科院分区：
文献类型：
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作者：
M. Cardoso;Emmanuelle S. Silva
雄性对精荚质量的投资是一妻多夫程度的函数。在蝴蝶和其他提供礼物的生物中，一妻多夫制倾向于选择比一妻多夫制质量更好的礼物。热带蝶属Heliconius erato和H. melpomene在交配系统中不同，并提供了一个理想的系统来测试关于分配给精荚质量和生产的期望。雄斑蝎蛉在出蛹时与雌斑蝎蛉交配。雌性为生活而交配，没有配偶选择。In H.在melpomene，女性追求男性，并可能在他们的一生中交配几次。为了评估精荚质量（质量和蛋白质含量）是否在两个物种之间存在差异，我们进行了交配实验与处女男性和处女女性在室外昆虫。为了研究在随后的交配过程中精荚生产的动态，雄性也被允许交配两次或更多次。处女H. melpomene雄性比H. erato，证实了理论预期;精荚质量没有不同。多雄蕊花型在第二次交配中也表现出明显的质量和蛋白质含量的减少，而H。ERATO反应混合但不显著。此外，连续交配之间的时间的影响是依赖于物种的身份。我们的研究结果证实，多雄Heliconius投资更多的精荚质量比单雄同类。两种解释建议观察到的损失的质量和蛋白质含量的多雄Heliconius，潜在的成本生产或战略射精。
Male investment in spermatophore quality is a function of the degree of polyandry. Among butterflies and other organisms that provide gifts, polyandry tends to select for gifts of better quality than monandry. Tropical butterfly species Heliconius erato and H. melpomene differ in mating systems and provide an ideal system to test expectations regarding allocation to spermatophore quality and production. Heliconius erato males mate with females while they emerge from pupa. Females mate for life and show no mate choice. In H. melpomene, females are courted by males and may mate several times in their lifetime. In order to evaluate whether spermatophore quality (mass and protein content) differed between the two species we conducted mating experiments with virgin males and virgin females in an outdoor insectary. In order to study the dynamics of spermatophore production during subsequent matings, males were also allowed to mate two or more times. Spermatophores of virgin H. melpomene males contained significantly more protein than those of H. erato, confirming theoretical expectations; spermatophore mass was not different. The polyandrous species also showed a significant reduction in mass and protein content in the second mating, while H. erato responses were mixed but non significant. Additionally, the effect of time between successive matings was dependent on species identity. Our results confirm that polyandrous Heliconius invest more in spermatophore quality than its monandrous congener. Two explanations are suggested for the observed loss of mass and protein content in polyandrous Heliconius, potential cost for production or strategic ejaculation.