Abstract
ABSTRACT Age validation is commonly based on the marginal increment ratio (MIR). This procedure has been used to validate the annual periodicity of growth band deposition. In this study, MIR data from geoducks Panopea globosa and Panopea generosa were analyzed using a new method for age validation based on a sinusoidal model. The model used four parameters, including the amplitude |δ|, defined as half the distance between the highest and the lowest values of the function; ρ, which is the cycle from 0–2π; τ, which is the horizontal shift; and λ, which is the vertical shift, or displacement. When the parameters in the sinusoidal function were estimated, the period could be computed as . The parameters were estimated using a maximum likelihood estimator. In addition, temperature and chlorophyll a were analyzed relative to the individual growth in shells. Based on parametric and nonparametric tests of the MIR data, the analysis identified a monthly progression of growth increment formation over an annual peri...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
