Drought blocking passages to sea for California coho salmon
Peter Moyle, a longtime salmon expert and emeritus professor at UC Davis, recalled the four small streams in San Francisco Bay that once had coho. He has been following the Puget Sound research, which he is also not affiliated with, and now wonders whether all the roads and major freeways that crossed these creeks contributed to their disappearance decades ago, despite all the restoration efforts.
Researchers then soaked tire bits in room temperature water for about 24 hours. As many as 1,500 to 2,800 chemicals would leach out and, using high-resolution mass spectrometry, the team methodically identified and analyzed these compounds.They tried sectioning this tire cocktail into different chemical properties, such as removing all metals from the solution. Then they tested these different sub-mixtures to see which ones were still toxic to the salmon.
Not much is known about 6PPD-quinone, but it does appear to be very toxic and does not degrade as quickly as 6PPD.It remains unclear how exactly this chemical kills coho salmon, but it may be doing something to the lining of the salmon’s vascular system, said Jen McIntyre, an aquatic ecotoxicologist at Washington State University who has been studying this mystery for more than 15 years.
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