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Simulation of optically conditioned retention and mass occurrences
 

Summary: Simulation of optically conditioned
retention and mass occurrences
of Periphylla periphylla
NICOLAS DUPONT* AND DAG L. AKSNES
DEPARTMENT OF BIOLOGY, UNIVERSITY OF BERGEN, PO BOX 7803, N-5020 BERGEN, NORWAY
*CORRESPONDING AUTHOR: nicolas.dupont@bio.uib.no
Received August 31, 2009; accepted in principle December 18, 2009; accepted for publication January 22, 2010
Corresponding editor: Mark J. Gibbons
Jellyfish blooms are of increasing concern in many parts of the world, and in
Norwegian fjords an apparent increase in mass occurrences of the deep water
jellyfish Periphylla periphylla has attracted attention. Here we investigate the hypothesis
that changes in the water column light attenuation might cause local retention and
thereby facilitate mass occurrences. We use a previously tested individual-based
model of light-mediated vertical migration in P. periphylla to simulate how retention is
affected by changes in light attenuation. Our results suggest that light attenuation, in
combination with advection, has a two-sided effect on retention and that three fjord
categories can be defined. In category 1, increased light attenuation turns fjords into
dark "deep-sea" environments which increase the habitat and retention of P. periphylla.
In category 2, an optimal light attenuation facilitates the maximum retention and
likelihood for mass occurrences. In category 3, further increase in light attenuation,

  

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

 

Collections: Environmental Sciences and Ecology; Biology and Medicine