INHERITANCE OF REDUCTION, LOSS, AND ASYMMETRY OF THE PELVIS IN PUNGITIUS-PUNGITIUS (NINESPINE STICKLEBACK)
INHERITANCE OF REDUCTION, LOSS, AND ASYMMETRY OF THE PELVIS IN PUNGITIUS-PUNGITIUS (NINESPINE STICKLEBACK)
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DOI：
10.1038/hdy.1992.4
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发表时间：
1992-01-01
期刊：
影响因子：
3.8
通讯作者：
BOYD, GJ
中科院分区：
文献类型：
--
作者：
BLOUW, DM;BOYD, GJ
刺鱼（Pungitius pungitius）的骨盆通常是一个坚固的，两侧对称的结构，具有坚固的刺。在某些种群中，它的大小减少，有时甚至完全消失。复位的第一个迹象是脊柱的丢失，这伴随着骨盆骨（遗迹）尺寸的减小和双侧不对称性的增加。进一步减少的规模的痕迹导致他们最终的损失。在一个骨盆减少人口的倾向，脊柱不对称是高度遗传（h2 = 0.8 5 +/-0.14），但不对称的骨骼痕迹的鱼没有脊柱是不可遗传的。脊柱的缺失是可遗传的，骨性痕迹的大小也是如此（h2 = 0.49 +/-0.12）。来自减少种群的无刺鱼与来自两个正常种群之一的有刺鱼的杂交只产生有刺的后代。骨盆大小的群体间遗传力为h2 = 0.26 +/-0.10，而双侧不对称的群体间遗传力为0。棘和痕迹的表达的影响相对较小的pH值，钙，和盐度的变化。我们提出了一个多基因模型的遗传与两个表型阈值，上棘的存在和骨盆的完全缺乏较低。渠道化在阈值之间中断。这种遗传系统可能早于棘鱼属的分化。我们讨论了它的相关性，了解骨盆减少现存的和化石棘鱼种群的动态。
The pelvis of Pungitius pungitius (ninespine stickleback) is normally a robust, bilaterally symmetrical structure with stout spines. In some populations it is reduced in size, sometimes to complete absence. The first sign of reduction is loss of the spines, which is accompanied by a reduction in the size of the pelvic bones (vestiges) and an increase in bilateral asymmetry. Further reduction in the size of the vestiges leads to their eventual loss. In a pelvis-reduced population the propensity to spine asymmetry is highly heritable (h2 = 0.8 5 +/- 0.14) but asymmetry of the bony vestiges in fish without spines is not heritable. The absence of spines is heritable, as is size of the bony vestiges (h2 = 0.49 +/- 0.12). Crosses of spineless fish from a reduced population with spined fish from either of two normal populations produce only spined progeny. The inter-population heritability of pelvis size is h2 = 0.26 +/- 0.10, but that of bilateral asymmetry is zero. The expression of spines and vestiges is influenced relatively little by variation in pH, calcium, and salinity. We propose a polygenic model of inheritance with two phenotypic thresholds, the upper for the presence of spines and the lower for complete absence of the pelvis. Canalization breaks down between the thresholds. This genetic system probably predates divergence of the stickleback genera. We discuss its relevance to understanding the dynamics of pelvis reduction in extant and fossil stickleback populations.