Although recent articles state that jellyfish populations are increasing, most available
evidence shows that jellyfish abundances fluctuate with climatic cycles. Reports of …

Zooplankton is a morphologically and taxonomically diverse group and includes organisms
that vary in size by many orders of magnitude, but they are all faced with the common …

By the pulsed nature of their life cycles, gelatinous zooplankton come and go seasonally,
giving rise in even the most undisturbed circumstances to summer blooms. Even …

Medusae, siphonophores and ctenophores (here grouped aspelagic coelenterates') interact
with fish in several ways. Some interactions are detrimental to fish populations, such as …

Much speculation and some evidence suggest that jellyfish and ctenophore populations
have increased in recent decades. Unfortunately, few past records exist with which to …

Jellyfish blooms occur in many estuarine and coastal regions and may be increasing in their
magnitude and extent worldwide. Voracious jellyfish predation impacts food webs by …

The introduction of alien, or nonindigenous, animals and plants has been identified by
scientists and policy makers as a major threat to biodiversity in marine ecosystems. Although …

A population explosion of the giant jellyfish Nemopilema nomurai (Scyphozoa:
Rhizostomeae) occurred in the Sea of Japan in 2002 and 2003, causing severe damage to …

European brackish water seas (Baltic Sea, Black Sea and Sea of Azov, Caspian Sea) are
subject to intense invasion of non-indigenous species (NIS). In these seas, salinity is the …

Although eutrophication is a widespread problem in marine waters, its effects are often
difficult to separate from normal fluctuations of pelagic coelenterate populations and from …