Stehlik et al.: Distribution patterns of various crab species in the Hudson-Raritan Estuary 



701 



Blue crab, winter 



E3 Males 



 Females 



1 



12 



4 5 6 7 8 9 



Blue crab, summer 



fll 



12 3 4 5 



J 



6 7 8 9 



Lady crab, summer 



12 3 4 5 6 



l DO 

 80 

 60 

 40 

 20 

 



Rock crab, winter 



n 



q_q_ 



gj 





6- 

 4 

 2 

 



Rock crab, summer 



^R - n I 



2mlA 



m 



3 4 



Strata of Hudson-Raritan estuary 



Figure 6 



Catch per unit of effort for male and female crabs by seasons and strata, 

 January 1992-December 1994. Note differences in scale among j axes. 



100 



Blue 



Lady 



Rock 



Figure 7 



Percent volume of prey (of the 12 chosen categories) of 

 blue, lady, and rock crabs from the Hudson-Raritan 

 Estuary, including all strata and size classes, June 

 1991-June 1992. n=713. Codes for prey taxa are from 

 Table 3. 



Rock_M_Imm 

 Rock_M_Mat 



Blue_M_Imm 

 Blue_F_Mat 

 Blue_M_Mat 

 Blue_F_Imm 

 Lady_M_Mat 

 Lady_F_Mat 



Lady_M_Imm 

 Lady_F_Imm 



i 1 1 1 1 1 1 1 1 



100 90 80 70 60 50 40 30 20 



Percent similarity in diet 



Figure 8 



Cluster analysis dendrogram of similarities of the 

 diets of species, sexes (M=male. F=female), and matu- 

 rity stages (Imm=immature, Mat = mature) of blue, 

 lady, and rock crabs, including all seasons and strata, 

 June 1991-June 1992. Female rock crabs were not 

 included because of the small sample size. 



