Shell length-at-age data

Studies on age and growth have focused on estimating average growth trajectories that ignore intrinsic biological variability about individual growth. Growth variability is identified as a source of bias for parameter estimation, if this is not considered, can lead to under or overestimations of individual growth. Commonly, growth analysis only include data from one developmental stage (i.e., adult population), assuming constant growth throughout the life cycle. Dataset provides information about geoduck Panopea globosa from Bahía Magdalena, on the west coast of the Baja California Peninsula, Mexico. Datasets includes two different stages of development: 1) Length-at-age data of early stages were obtained under rearing experimental conditions. 2) The adult individuals were obtained from commercial catches; SL (mm) was measured as the straight-line distance between the anterior and posterior margin of the shell. Age data were collected in the laboratory by processing the shells to count growth rings. Dataset is available in Excel format (csv) and include two spreadsheets. The first contains length (μm) and age (days) data of 797 individuals in the early stages; second comprises length (mm) and age (years) data of 357 adult individuals. Each spreadsheet is structured in two columns, which correspond to each biological variable. More detailed information about the data can be obtained from Luquin-Covarrubias et al. (2016).有关年龄与生长的研究多聚焦于平均生长轨迹的估算，却忽略了个体生长的内在生物学变异。生长变异被认为是参数估计偏差的来源之一，若未对此加以考量，可能会导致个体生长参数的低估或高估。常规生长分析通常仅采用单一发育阶段的数据（即成年种群），并假设整个生命周期内生长速率恒定。本数据集涵盖采自墨西哥下加利福尼亚半岛西侧马格达莱纳湾（Bahía Magdalena）的球首象拔蚌（Panopea globosa，俗称象拔蚌）的相关信息。该数据集包含两个不同发育阶段的样本数据：1）早期个体的体长-年龄数据来源于养殖实验条件下的观测；2）成年个体数据取自商业捕捞样本，其壳长（SL，单位为毫米，mm）定义为贝壳前后缘之间的直线距离。年龄数据通过实验室处理贝壳、计数生长轮的方式获取。本数据集以Excel格式（csv）提供，包含两个工作表：第一个工作表收录了797个早期个体的体长（单位为微米，μm）与年龄（单位为天）数据；第二个工作表则涵盖357个成年个体的体长（单位为毫米，mm）与年龄（单位为年）数据。每个工作表均设两列，分别对应两类生物学变量。有关该数据集的更多详细信息可参阅Luquin-Covarrubias等人（2016）的研究成果。