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INTRODUCTION In the aquatic environment visual predation is strongly
 

Summary: INTRODUCTION
In the aquatic environment visual predation is strongly
affected by absorption and scattering processes giving
rise to poor image transmission and low levels of light
intensity. Poor visibility limits the pelagic visual predator
in their search for food, but enhances the opportunities
for finding refuges for the prey. Because foraging rate
and predation risk have great impact on habitat choice,
growth and survival (MANGEL & CLARK 1986; 1988;
HOUSTON & al. 1993; AKSNES 1996), visual foraging has
become an important element of spatial explicit models
of fish and plankton ( CLARK & LEVY 1988; MASON &
PATRICK 1993; ROSLAND & GISKE 1994; TYLER & ROSE
1994; FIKSEN & al. 1995; GISKE & SALVANES 1995; GISKE
& al. 1997; ROSLAND in press). The competitive
relationship between tactile and visual pelagic predators
is severely affected by optical properties of the water
column (EIANE & al. in press). The study by KAARTVEDT
& al. (1996) demonstrates how horizontal gradients in
optical properties can influence distribution and

  

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

 

Collections: Environmental Sciences and Ecology; Biology and Medicine