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 de julho de 2022
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It’s a particular quality that makes something different from other similar things.
10 de julho de 2022
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A mark of something. Andy said it best!
8 de julho de 2022
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