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Given the uncertainty around the collated values Yankovich et al. recommended that ratios of between 0.75 and 1.5 should not be applied and that a value of 1.0 should be assumed instead. In the tables which can be accessed below and values between 0.75 and 1.5 have been replaced with a value of 1.0.
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https://wiki.ceh.ac.uk/download/attachments/120291888/Bivalves_Table 1.pdf |
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