Saturday , July 2 2022

B.C. Salmon in warm water blob – Terrace Standard



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An abnormality or new norm, the researchers are watching carefully what they mean for the heated hot water blob and the salmon in the northeastern Pacific Ocean.

In the last two months, a high-pressure back on the coastal zone of B.C. The storm season was late and the water was two to three degrees hotter.

In the fall of 2013, Richard Dewey, director of science at Ocean Networks Canada and Victoria University, followed closely the nearly 2000 kilometer-long unspoiled hot zone that made its first appearance in the autumn of 2013 and was even more noticeable in the spring of 2014 – the researchers used the term müdür blob Ocean.

Dı This incident woke us up to what happened here. The atmosphere, the storm and the jet streams are coming together, and we're getting weaker winds than the bay, so we don't stay cool with cold water and things, ve said Dewey.

Now they're paying attention. By 2017, oceanographers began to see the hot audience scattered in depth, but this year in the northeastern Pacific and the Bering Sea.

Trend Maybe this trend. Perhaps this is how climate change will reflect on our backyard, but we don't know it yet, iklim Dewey said.

Ocean Networks Canada has coastal and coastal vehicles. They did not receive the 2014 block to their sensors until months ago, so researchers are closely following satellite data and sea surface temperature maps for the Gulf of Alaska.

Effects on salmon

Ocean heat also affects fresh water temperatures.

Sue Grant is the State of Salmon Program for Fisheries and Oceans Canada (DFO). His role is to integrate what we know about salmon and ecosystems. Oceanography and freshwater researchers see a relationship between bubble and warming in rivers and streams.

”The block itself is an oceanographic phenomenon, but it also comes into being through the echoes of fresh water and the atmosphere, f he said.

Salmon is abnormal with fresh water and marine life stages and live in warmer weather in both habitats. Grant said the effects of the 2015 and 2015 hot blob changed according to the salmon stocks in B.C. and Yukon region.

Da While some of our southern stock and some of our northern regions are not as successful this year, the reactions are mixed. Last year we found that the average survival rate in salmon stocks in Fraser Watershed was low, and this year we were still below average survival rates in Fraser. There are other examples in the north. Kuzey

Grant uses the analogy of a marathon to describe what temperatures are done in salmon at temperatures of 3-5 degrees Celsius.

If he was to run a marathon at 50 degrees Celsius, he might not survive because he was out of the 50-60 Celsius degree. Salmon has the most suitable temperature range and can have a negative impact on migration when trying to migrate upwards in summer.

The warmer average water temperatures also affect the nutrient level.

When the ecosystem changed during 2014-2015, the surface layer of the Gulf of Alaska was weaker in nutrients. Ocean Networks Canada found that cold water types that are in need of a nutrient-rich environment are not common, and that hot water species that can adapt to low nutrient conditions prevail.

D When the salmon was fed under these conditions in the bay and in coastal conditions, they returned back in 2016-17, which is slightly smaller than normal, lend said Dewey.

Etk The numbers I see show that these hot conditions can result in smaller fish sizes, which has some effect. “

Both Grant and Dewey say they pay attention, but it's too early to make a projection, and 2018 is what the hot blob means for salmon.

However, they can take data from the last few years – salmon reactions to warming in freshwater and marine ecosystems – and see if they are a model and what it means for the future of salmon stocks.


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