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首页> 外文期刊>Marine biology >Pinna nobilis L., 1758 age determination by internal shell register
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Pinna nobilis L., 1758 age determination by internal shell register

机译：Pinna nobilis L.，1758年通过内壳寄存器确定年龄

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The age of the Mediterranean endemic Bivalve mollusc Pinna nobilis is estimated using the total size and the number and position of posterior adductor muscle scars (PAMS): a series of straight lines and rings observed in the dorsal nacre-lobe. Nevertheless, the position of PAMS of adult individuals inhabiting the same population and depth is highly variable. To assess the source of this variability, the shells of nine individuals were cut into radial sections along PAMS and the inner register was studied. The cuts showed clear marks of the inner register formed around the PAMS composed by a short nacre tongue introduced within the calcitic layer and two calcitic strips of differing colour (bright and dark). The three components are directed towards the posterior of the shell. The marks of the inner register coincide only with the straight lines of PAMS, but are observed in an anterior position further than the straight lines and rings, and in a posterior position further than the rings. Also, some of the most posterior marks can be observed one under the other in the oldest individuals. The existence of the inner register's marks in a position further anterior than the straight lines and rings implies that a variable number of PAMS are obscured beneath nacreous deposits. Eventually, we advise against the utilization of PAMS to study P. nobilis age. We instead recommend the use of the inner register as it records more accurately the life history of the individuals, and data indicates that each mark is formed annually.
机译：地中海地区特有的双壳贝类软体动物Pinna nobilis的年龄是使用后内收肌疤痕（PAMS）的总大小，数量和位置来估算的：在珍珠质背叶中观察到一系列直线和环。然而，居住在相同人口和深度的成年个体的PAMS位置是高度可变的。为了评估这种可变性的来源，将9个个体的壳沿PAMS切成径向部分，并研究内部寄存器。切痕显示出PAMS周围形成的内部记号的清晰痕迹，该内部记号由引入钙质层和两个不同颜色（明亮和深色）的钙质条中的短珍珠质舌组成。这三个组成部分都指向壳体的后部。内部套准的标记仅与PAMS的直线重合，但在比直线和圆环更靠前的位置以及比圆环更靠后的位置观察到。同样，在最老的个体中，一些最后部的标记可以一个接一个地观察到。内部寄存器的标记位于比直线和圆环更靠前的位置，这意味着在珍珠质沉积物下方掩盖了数量不等的PAMS。最终，我们建议您不要使用PAMS来研究nobilis年龄。相反，我们建议使用内部寄存器，因为它可以更准确地记录个人的生活史，并且数据表明每个标记都是每年形成的。

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