RICHARD HERRMANN, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY RICHARD HERRMANN, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY
Pelagic red crabs during an El Nino. Pelagic red crabs (Pleuroncodes planipes), also called tuna crabs, are a type of squat lobster. They are found in the eastern Pacific, normally restricted to the areas south and west of San Diego. However, during an El Nino weather event, as shown here, they appear further northwards on beaches in California, USA. The El Nino Southern Oscillation (ENSO) is an irregular occurrence of periodic climate change. It is caused by variations in sea surface temperatures over the tropical eastern Pacific Ocean. It affects climate in the tropics and subtropics. It is thought that an El Nino event has been forming in 2014 and 2015.
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