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Global warming could help salmon in Norway
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| Parent(s) |
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| Contributor | Bob |
| Last Edited | Bob Nov 05, 2005 10:37am |
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| Category | News |
| Media | Website - Yahoo News |
| News Date | Saturday, November 5, 2005 04:00:00 PM UTC0:0 |
| Description | OSLO (Reuters) - Global warming may benefit salmon in Norwegian rivers by causing more rainfall that dilutes industrial acids blown from other parts of Europe, scientists said on Friday.
In the past, a spring thaw used to wash out large amounts of poisonous nitrates accumulated in winter snows, according to a long-term study of rain, snow and river acidification by the Norwegian Institute for Water Research (NIVA).
But climate change in the past 20-30 years means that more precipitation falls as rain, washing nitrates more evenly around the year into rivers and curbing a spring surge when salmon smolt are most vulnerable to poisoning.
A smolt is a young salmon at the stage when it migrates from fresh water to the sea.
"For salmon this is a good situation because nitrate is acidifying the rivers. Salmon go through a physiological change in the spring to adapt to the marine environment," said Atle Hindar, a researcher at NIVA who led the study.
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