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标题：The clam sipho as indicator for growth indices in the soft-shell clam Mya arenaria
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作者：Frank Schäffer ; Michael L. Zettler
期刊名称：Helgoland Marine Research
印刷版ISSN：1438-3888
出版年度：2007
卷号：61
期号：1
页码：9-16
DOI：10.1007/s10152-006-0049-0
出版社：BioMed Central
摘要：Due to the species’ deep burrowing behaviour, growth parameters of the soft-shell clam Mya arenaria L. 1758 are difficult to estimate, especially in deeper habitats which are not directly accessible. In this study, we analysed 192 specimens of M. arenaria and found, contrary to results of most other studies that the sigmoid Gompertz growth model (GGM) is appropriate to describe the growth. Predictions from this model confirm the finding of a life span up to 8 years and as a consequence of this, a maximum shell-length of 60 mm. Individual growth rates calculated from the first deviation indicate a nearly exponential growth in young individuals. The relationship between the clam sipho-width and age, shell-length and biomass conform to the GGM. This is a new approach to assess growth of M. arenaria and to solve practical problems that arise in field studies.
关键词：M ;arenaria;Growth-indices;Sipho-width;Bertalanffy growth model;Gompertz growth model