CONTENTS 



Introduction 1 



Study area 1 



Materials and methods 2 



Data collection 2 



Data analysis 3 



Results 3 



Hydrographic parameters 3 



Community composition and diversity 3 



Temporal and spatial distributions — fishes 8 



Temporal and spatial distributions — decapods 11 



Biomass estimates 12 



Discussion 13 



Acknowledgments 16 



Literature cited 16 



Figures 



1 . Station locations in North and South Santee Rivers, S.C 2 



2. Monthly fluctuations in number of species and number of individuals (log transformed) of fishes and decapod 

 crustaceans at sampling sites in the North and South Santee Rivers, 1975-76 6 



3. Two-way coincidence tables of constancy and fidelity which compare species associations with stations in the 

 North and South Santee Rivers, 1975-76. The species associations, designated alphabetically, resulted from 

 cluster analysis of species (dendrogram not shown) collected from the Santee system. Species comprising these 

 associations are listed in Table 5 



4. Abundance of A) Micropogonias undulatus and B) Anchoa mitchilli by station and season for the North and 

 South Santee Rivers. Ratios over bars indicate number of collections where fishes were captured to total 

 number of collections at a station 9 



5. Abundance of A) Ictalurus catus and B) Bairdiella chrysoura by station and season for the North and South 

 Santee Rivers. Ratios over bars indicate number of collections where fishes were captured to total number of 

 collections at a station 10 



6. Abundance of Trinectes maculatus by station and season for the North and South Santee Rivers. Ratios over 



bars indicate number of collections where fishes were captured to total number of collections at a station 11 



7. Seasonal abundance and length-frequency distribution of Penaeus setiferus within the North and South Santee 

 Rivers. Ratios over the bars indicate number of collections where shrimp were captured to total number of col- 

 lections at a station 12 



8. Abundance of A) Penaeus aztecus and B) Callinectes sapidus. Ratios over the bars indicate number of collec- 

 tions where shrimp were captured to total number of collections at a station 13 



Tables 



1. Total number and total weight of fishes collected from 1975 and 1976 in estuaries of the North and South 

 Santee Rivers, S.C. Species are listed in order of abundance, and data are pooled from the 2-yr sampling 

 period 4 



2. Total number and total weight of decapod Crustacea collected from 1975 and 1976 in the North and South 

 Santee Rivers. Species are listed in order of abundance and data are pooled over the 2-yr sampling period 5 



3. Correlation between In (n + 1) transformed values of number of species and number of individuals of fishes 



and decapods in relation to environmental factors 6 



4. Groups formed from cluster analysis of species of fishes and decapod Crustacea collected in the North and 

 South Santee Rivers from 1975 and 1976 



5. Estimates of density and number of individuals/ha for fishes caught by trawls from estuaries along the Gulf and 



east coasts of the United States 12 



