Zoologisches Institut der Universität, Rheinsprung 9, CH-4051, Basel, Switzerland.
J Chem Ecol. 1992 Aug;18(8):1375-87. doi: 10.1007/BF00994363.
Defensive secretions of adultOreina gloriosa, liberated at the surface of the pronotum and elytra, contain a complex mixture of cardenolides, and ethanolamine. Proportions and concentrations of constituents determined by reverse-phase HPLC show considerable variation among individual beetles. Heritabilities of proportions of five main components were estimated by mother-offspring regression providing a validation of the less reliable full-sib correlation estimates. Average heritabilities based on the two methods were 0.51 and 0.58, respectively, estimated by using offspring of two age groups. Regression estimates of 2- and 10-week-old offspring differed significantly for one secretion constituent (RT16). Heritability estimates of concentrations of 16 secretion components were calculated by full-sib correlation analysis. Average heritability was 0.45, indicating a significant genetic component. Estimates did not differ significantly between the two age groups. We also estimated heritabilities of concentrations by a two-way model including data from offspring of both age groups. Heritability estimates based on this model are thought to correspond approximately to estimates based on samples from natural populations. The average of these estimates was lower (h (2) =0.31) than the average heritability of each age group separately (h (2) =0.45), suggesting a developmental effect on variation in chemical defense ofO. gloriosa.
成虫 Oreina gloriosa 从前胸背板和鞘翅表面释放的防御分泌物中含有复杂的强心甾内酯和乙醇胺混合物。通过反相高效液相色谱法确定的各组成比例和浓度在个体甲虫之间存在很大差异。通过母子回归估计了五个主要成分比例的遗传力，为不太可靠的全同胞相关估计提供了验证。使用两个年龄组的后代，基于这两种方法的平均遗传力分别为 0.51 和 0.58。对于一种分泌物成分（RT16），2 周龄和 10 周龄后代的回归估计值存在显著差异。通过全同胞相关分析计算了 16 种分泌物成分浓度的遗传力估计值。平均遗传力为 0.45，表明存在显著的遗传成分。这两个年龄组之间的估计值没有显著差异。我们还通过包括两个年龄组后代数据的双向模型估计了浓度的遗传力。基于该模型的遗传力估计值被认为与基于自然种群样本的估计值大致对应。这些估计值的平均值（h (2) =0.31）低于每个年龄组单独的平均值（h (2) =0.45），表明 Oreina gloriosa 化学防御的变异存在发育效应。
