Global Warming Could Account for Sardines[?]

Here's a short one from the LA Times. I don' think
they've quite established a link to global warming.
Please correct me if I'm wrong, but doesn't La Nina
bring more sardines? Or is that a feature of El Nino?

- - - Roger
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IN BRIEF / THE STATE / MONTEREY
Global Warming Could Account for Sardines
From LA Times Staff and Wire Reports

Warming ocean currents are bringing sardines back to Monterey Bay after
decades of decline.

Some scientists think global warming could be partly responsible for
the burgeoning sardine population, although no one can say for sure
whether warmer water is part of a natural cycle.

"Global warming may make it so that we always have sardines in
California," said oceanographer Jerrold Norton of the National Marine
Fisheries Service.

The silvery fish are making a comeback from Mexico to British Columbia.