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Figure 8. — Abundance of A» Penaeus aztecus and B) Callinectes sapidus. Ratios over the bars indicate number of collections where shrimp 



were captured to total number of collections at a station. 



We obtained the following density estimates of decapod 

 Crustacea from the Santee system: 





Biomass 



Density 





(kg/ha) 



(no. /ha) 



South Santee 



5.5 



836 



North Santee 



1.9 



255 



These estimates are comparable to 6.1 kg/ha and 1,190 in- 

 dividuals/ha reported by Hoese (1973) for all invertebrates col- 

 lected from Doboy Sound, Ga. 



DISCUSSION 



The distributional patterns of estuarine fishes and decapod 

 Crustacea are influenced by numerous environmental factors. 

 Factors such as salinity (e.g., Gunter 1938, 1945, 1961; Kilby 

 1955; Kinne 1966; Copeland and Bechtel 1974), temperature 

 (Gunter and Hildebrand 1951; Reid 1954; Kinne 1963), substrate 

 and detritus (Carr and Adams 1973; Mills 1975; Livingston et al. 

 1977), and river discharge (Aleem 1972; Ruello 1973; Livingston 

 et al. 1977; Glaister 1978) influence animal distributions, with 

 the extent of these influences dependent on spatial (habitat) 



13 



