Give 'til it hurts: trade-offs between immunity and male reproductive effort in the decorated cricket, Gryllodes sigillatus
Give 'til it hurts: trade-offs between immunity and male reproductive effort in the decorated cricket, Gryllodes sigillatus
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DOI：
10.1111/j.1420-9101.2010.01951.x
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发表时间：
2010-04-01
影响因子：
2.1
通讯作者：
Sakaluk, S. K.
中科院分区：
文献类型：
--
作者：
Gershman, S. N.;Barnett, C. A.;Sakaluk, S. K.
生活史变量之间的权衡可以在表型或遗传水平上表现出来，其进化结果截然不同。在这里，我们研究了来自8个近交系的雄性装饰蟋蟀(Gryllodes Sigillatus)和它们衍生的近交系创始人群体是否权衡了免疫努力[裂解活性、酚氧化酶(PO)活性或包裹体]来产生精原：昂贵的婚礼食物礼物，对成功的精子移植至关重要。典型相关分析表明，在精叶质量和裂解活性之间存在权衡。然而，对我们的自交系的分析表明，虽然PO活性、包封率、体质量、精叶质量和壶腹(精子囊)质量都是高度遗传的，但裂解活性不是高度遗传的，因此，裂解活性与精芽质量之间不存在负遗传相关。因此，雄性在精子数量和裂解活性之间表现出表型上的权衡，而不是遗传上的权衡，这表明这种权衡很大程度上是由环境因素调节的。
Trade-offs between life-history variables can be manifested at either the phenotypic or genetic level, with vastly different evolutionary consequences. Here, we examined whether male decorated crickets (Gryllodes sigillatus) from eight inbred lines and the outbred founder population from which they were derived, trade-off immune effort [lytic activity, phenoloxidase (PO) activity or encapsulation] to produce spermatophylaxes: costly nuptial food gifts essential for successful sperm transfer. Canonical correlation analysis of the outbred population revealed a trade-off between spermatophylax mass and lytic activity. Analysis of our inbred lines, however, revealed that although PO activity, encapsulation, body mass, spermatophylax mass and ampulla (sperm capsule) mass were all highly heritable, lytic activity was not, and there was, therefore, no negative genetic correlation between lytic activity and spermatophylax mass. Thus, males showed a phenotypic but not a genetic trade-off between spermatophylax mass and lytic activity, suggesting that this trade-off is mediated largely by environmental factors.