NOTE Jensen et al.. Differenuating Paralithodes larvae using telson spines 



779 



Figure 2 



Measurements taken from Paralithodes spp. zoeae. (A) 

 rostrum length, (B) eye length, (C) carapace length. 



zoeae of both species in the two areas. Those with an 

 anomalous number of spines (8-i-7 and "BKC" with 

 7-1-7) were then similarly plotted for comparison. 



Unless otherwise indicated, data are presented as 

 mean ± 1 standard deviation. ANOVAs were used to 

 test for significant differences (a < 0.05) between the 

 means of different groups, and the means compared 

 using Tukey's T method. A two-way ANOVA was used 

 to examine intraspecific variation in zoeae I between 

 the two areas. 



Results 



Plotted ratios of rostrum length/carapace length for 

 Pribilof Island specimens fell into two distinct clouds 

 representing those thought to be RKC (longer rostrum) 

 and BKC (Fig. 3). These were not so clearly separated 

 in the samples from Herendeen Bay; nevertheless, all 

 those with an asymmetric telson spine pattern or a 

 short rostrum, large body, and spine count of 7 -i- 7 fell 

 within the cloud of 8 -i- 8 BKC larvae (Fig. 4). These lar- 

 vae were designated as BKC and divided into groups 

 based on number of telson spines. The ratios for all of 

 these groups were significantly different (p<0.05) at 

 each zoeal stage from the means for RKC zoeae; Figure 

 5 shows combined results for both species at the two 

 locations. Both the carapace and eyes of BKC larvae 

 were significantly longer than those of RKC at all 



c 



Q. 



to 



O 



o 



cc 



0.7 



0.6- 



0.5 



0.4- 



= 0.3- 



0.2 



••• 



• 7+7 Red King Crab 



O 7*7 Blue King Crab 



A 7+8 Blue King Crab 



D 8+8 Blue King Crab 



A n 



1.7 1.9 2.1 2.3 2.5 



Carapace Length (mm) 



2.7 



Figure 4 



Ratios of rostrum length/carapace length for first-stage 

 Paralithodes spp. zoeae collected from Herendeen Bay, 

 Alaska. 



stages, but these differed considerably between the two 

 areas. Two-way ANOVA revealed no significant dif- 

 ference in rostrum/carapace length ratio for zoeae-I 

 BKC from the two areas, but significantly smaller 



