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Causes for mass occurrences of the jellyfish Periphylla periphylla: a hypothesis
 

Summary: Causes for mass occurrences of the
jellyfish Periphylla periphylla: a hypothesis
that involves optically conditioned
retention
TOM A. SØRNES1, DAG L. AKSNES1*, ULF BA° MSTEDT1,2 AND MARSH J. YOUNGBLUTH3
1
DEPARTMENT OF BIOLOGY, UNIVERSITY OF BERGEN, PO BOX 7800, N-5020 BERGEN, NORWAY, 2
UMEA° MARINE SCIENCE CENTRE, NORRBYN, SE-910 20
HO¨ RNEFORS, SWEDEN AND
3
HARBOR BRANCH OCEANOGRAPHIC INSTITUTION, 5600 US 1 NORTH, FORT PIERCE, FL 34946, USA
*CORRESPONDING AUTHOR: dag.aksnes@bio.uib.no
Received May 30, 2006; accepted in principle October 9, 2006; accepted for publication November 21, 2006; published online January 15,
2007
Communicating editor: K.J. Flynn
The mesopelagic coronate medusa Periphylla periphylla has been very abundant (20­320 indi-
viduals m22
), with as many as 2.5 individuals m23
, for more than a decade in certain Norwegian
fjords. These abundances are two to three orders of magnitude higher than reported from open ocean

  

Source: Aksnes, Dag L. - Institutt for biologi, Universitetet i Bergen

 

Collections: Environmental Sciences and Ecology; Biology and Medicine