Kotwicki et a\ Variation in the distribution of Theragra cholcogromma 



577 



Biomass decrease Biomass increase 



with temperature 180 w 176 ° w 172 ° w 168 ° w 164 ° w with temperature 



Clusters: 



Slope < - 0.3 (biomass decreases 

 with temperature) 



^m Slope > 0.3 (biomass increases with 

 ^™ temperature) 



Columns: 



mm Predicted % of total biomass in the 

 ^^ area during warmest year 



Predicted % of total biomass in the 

 area during coldest year 



Standard error bar 



172°W 168 W 164 : W 



Figure 2 



Clusters of positive and negative slopes of the linear regression of pollock (Theragra chalcogramma) density 

 (detected by echo-integration trawl survey) when plotted against temperature. Columns represent predicted per- 

 cent biomass offish in these clusters within the observed range of temperatures. Predicted percent of biomass is 

 shown only for clusters with the strongest relationship between temperature and fish density with the exception 

 of cluster Fl (see results for explanation). Labels are located at the geographic centers of the clusters. 



