Egg size plasticity in a seed beetle: An adaptive maternal effect
Egg size plasticity in a seed beetle: An adaptive maternal effect
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DOI：
10.1086/285983
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发表时间：
1997-01-01
影响因子：
2.9
通讯作者：
Mousseau, TA
中科院分区：
文献类型：
--
作者：
Fox, CW;Thakar, MS;Mousseau, TA
在种子甲虫，Staler limbatus中，卵大小的适合度结果在宿主植物中有很大差异。有强烈的选择产卵大卵时，幼虫将发展的种子Cercidium floridum（造成高死亡率穿透种皮），但选择产卵小卵时，幼虫将发展的种子金合欢（造成非常低的死亡率穿透种皮和卵大小/卵数权衡）。我们测试的假设，宿主相关的变化，在鸡蛋的大小在人口的S。limbatus代表了一种适应性的母体效应，其中雌性会调整卵的大小以响应宿主物种。在实验室实验中，S.缘纹瓢虫雌虫在C. floridum比A.我的天当在不同的宿主之间转换时，雌性会重新调整卵的大小，在C上产生越来越大的卵。floridum和小卵在A.我的天当有条件下，无论是小鸡蛋（在A。gregabe）或大卵（C. floridum），然后在C. floridum，雌性以C. floridum产卵的存活率显著高于以A.这些实验表明，卵大小是一种适应性可塑性状。缘肌
ln the seed beetle, Staler limbatus, the fitness consequences of egg size vary substantially among host plants. There is intense selection for laying large eggs when larvae will develop on seeds of Cercidium floridum (caused by high mortality penetrating the seed coat) but selection for laying small eggs when larvae will develop on seeds of Acacia greggii (caused by very low mortality penetrating the seed coat and an egg size/egg number trade-off). We test the hypothesis that host-associated variation in egg size within populations of S. limbatus represents an adaptive maternal effect in which females adjust egg size in response to host species. In laboratory experiments, S. limbatus females laid significantly larger and fewer eggs on C. floridum than on A. greggii. When switched between hosts, females readjusted egg size, producing progressively larger eggs on C. floridum and smaller eggs on A. greggii. When conditioned to lay either small eggs (on A. greggii) or large eggs (on C. floridum), and then forced to lay on C. floridum, females conditioned on C. floridum laid eggs that had substantially higher survivorship than eggs laid by females conditioned on A. greggii, These experiments demonstrate that egg size is an adaptively plastic character in S. limbatus.