Though
some reports suggest jellyfish are taking over the world’s oceans, long-term
records of these gelatinous animals fail to show a global increase in jellyfish
blooms likely caused by pollution, warming, coastal development and other human
influences.
While
the analysis of a team of researchers who have pulled together records of
jellyfish presence going back to the 19th century don't support a
rising gelatinous menace, the team did find a surprise: roughly 20-year
cycles in the abundance of jellies.
Part
of a recent rise-and-fall cycle may have prompted the perception of a global
swell in jellyfish, according to the international team, whose researchers are
part of the Global Jellyfish Group. They point specifically to the rising phase
that began in 1993 and peaked in 2004.
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