Age determination and growth rate of a Callista chione population from the southwestern coast of Portugal
Age determination and growth rate of a Callista chione population from the southwestern coast of Portugal
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葡萄牙西南海岸 Callista chione 种群的年龄测定和增长率
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
C. Monteiro
中科院分区：
文献类型：
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作者：
P. Moura;M. Gaspar;C. Monteiro
在为期 1 年的研究期间，通过使用表面生长环和内壳微生长线（通过醋酸盐剥离法）估算了来自葡萄牙西南海岸的光滑蛤 Callista chione 的年龄和生长情况。这2种方法得到的von Bertalanffy生长曲线分别为：Lt=91.9(1-e-0.18(t+0.22))和Lt=98.1(1-e-0.15(t+0.43))。基于这些，表面年轮的计数适合于快速估计 10 岁以下个体的年龄（~75 毫米壳长，SL）。对于较老的标本，建议分析贝壳横截面的生长线，因为靠近贝壳边界，很难区分贝壳表面的年轮。春季和夏季贝壳生长迅速，秋季和冬季缓慢生长，并沉积年轮。总体生长性能和 phi-prime 指数用于将生长参数与来自有关双壳类双壳类文献的数据进行比较。这些参数表明 Callista spp。与其他双壳类动物相比，它们具有更高的生长性能，这与地理纬度相关。光滑蛤在 4 岁时达到性成熟，并在 5 岁时达到最小着陆尺寸（60 毫米 SL）。
The age and growth of the smooth clam Callista chione from the southwestern coast of Portugal were estimated during a 1 yr study period by using both the surface growth rings and internal shell microgrowth lines (by acetate peel method). The von Bertalanffy growth curves obtained by these 2 methods were, respectively: Lt = 91.9(1 - e - 0.18 (t + 0.22) ) and Lt = 98.1(1 - e - 0.15 (t + 0.43) ). Based on these, the counting of surface growth rings is appropriate for a quick age estimation of individuals up to 10 yr old (~75 mm shell length, SL). For older specimens, analysis of the growth lines in the cross section of shells is recommended, because close to the shell border it becomes difficult to distinguish growth rings on the shell surface. Rapid shell growth occurred in spring and summer, whereas slow growth occurred during autumn and winter, with the deposition of an annual growth ring. The over- all growth performance and the phi-prime index were used to compare growth parameters with data from literature about venerid bivalves. These parameters indicated that Callista spp. have a higher growth performance than other venerid bivalves and this is correlated with geographical latitude. The smooth clam achieves sexual maturation at 4 yr of age and reaches the minimum landing size (60 mm SL) after 5 yr.