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Factors affecting mesozooplankton distributions in the northeastern tropical Pacific Ocean were investigated using data obtained along a meridian line (5°–12°N, 131.5°W) in the summers of 1998, 1999, and 2003. The survey periods corresponded to a sharp transition between the 1997–1998 El Niño and 1998–1999 La Niña events, the 1999 La Niña event, and near-normal conditions after the moderate 2002–2003...
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