Hello,
Signature just means distinctive. Distinctive means unique or peculiar. So, it's talking about the river's sediments, which is the special identifying mark for salmon's to go back to the Yukon.
Regards,
Andy
8 luglio 2022
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It’s a particular quality that makes something different from other similar things.
10 luglio 2022
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A mark of something. Andy said it best!
8 luglio 2022
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