NOTE Cope Intraspecific life history patterns in sharks 



317 



15 



10 



S. acanthias 



Fecundity 



NP NoA GM I CP SP SA 



150 



E 



S 100 



50 



Female size 



0-' 



-r 



NP NoA GM I 



CP SP SA 



Male size 



100 

 80 

 60 -\ 

 40 

 20- 

 



NP NoA GM I CP SP SA 



100 n 

 80 

 60 

 40 

 20 



P. glauca 

 Fecundity 







400 



300 



200 



100 



I 1 1 1 1 1 1 



NP NoA GM I CP SP SA 



Female size 



NP NoA GM 



CP SP SA 



400 



300 



200 



100 



- 



Male size 



All 



- - NP 



 •  NoA 



- • SP 



NP NoA GM I 



CP SP SA 



Area 



Figure 4 



Plots of model predictions derived by cross validation for S. acanthias and P. glauca. 

 Lines representing predicted value are distinguished as follows: "AH"- all areas are 

 included in the prediction; Lines denoted by area are predictions made without that 

 area. Literature values are indicated as follows: triangles — fecundity, circles — size 

 at maturity, squares — maximum size. Size at maturity for male P. glauca was not 

 included because of insufficient data. Areas: NP=North Pacific; NoA = North Atlan- 

 tic; GM = Gulf of Mexico; I = Indian Ocean; CP=Central Pacific; SP=South Pacific; 

 SA=South Atlantic. 



populations that would explain the results. Specifically, 

 there is no reason to believe that species in the south- 

 ern hemisphere have been more heavily fished than 

 conspecifics in the northern hemisphere. 



The results offered in the present study are based on 

 small sample sizes in most areas, but hopefully they 

 will bring attention to the usefulness of collecting spa- 



tially varying intraspecific information with the idea of 

 constructing more robust models. Most investigations 

 describing the patterns of shark life history traits suffer 

 from insufficient biological resolution (either temporally 

 or spatially) of the very parameters and subsequent 

 relationships they attempt to explain (Smith et al., 

 1998; Cortes, 2000). Limited biological knowledge and 



