Norcross et a I.: Habitat models for juvenile pleuronectids 
515 
highly intercorrelated (Norcross et al., 1995; Fig. 3). 
These parameters have been linked to the habitat 
quality of juvenile flatfishes in many other locations 
(Gibson, 1994). Larvae of many flatfish species are 
known to settle either in shallow water (Edwards 
and Steele, 1968; Lockwood, 1974) or offshore water 
Pacific halibut 
distance <7.9 km >7.9 km 
Node 
Figure 7 
Pruned regression tree for age-0 Pacific halibut with predictions of log(CPUE+l) at each termi- 
nal node, and number of stations in parentheses (top figure). Bottom figure contains box plots of 
log(CPUE-t-l) by terminal node. Each box plot summarizes distribution of CPUE at stations rep- 
resented by the terminal node directly above it. Box plots indicate median (filled circle), 
interquartile range (box height), and outliers (open circles). Whiskers indicate upper quartile 
plus 1.5 times interquartile range and lower quartile minus 1.5 times interquartile range. Width 
of boxes is proportional to square root of number of stations at that node. See text for sediment 
abbreviations. 
