HACUNDA: TROPHIC RELATIONSHIPS AMONG DEMERSAL FISHES 

 Table 14. — Numerical percentage of prey types in predator diets. 



Predator 



Nekton 



Epifauna 



Infauna 



fishes. Another factor to consider is the mul- 

 tidimensional aspect of resource partitioning. 

 Previous studies of fish assemblages have 

 suggested that subtle differences of resource use 

 along complimentary dimensions offer a possible 

 means of reducing interspecific competition 

 (Werner 1977; Ross 1977; Keast 1978). There is 

 evidence that time (e.g., daily and seasonal activ- 

 ity patterns) and space (e.g., foraging pattern) are 

 additional dimensions of importance influencing 

 food utilization by the demersal fish community in 

 Johns Bay. However, unraveling the confounding 

 effects of resource use along several dimensions 

 depends upon more detailed study of these 

 cohabiting fishes as well as increased sophistica- 

 tion of techniques for community analysis (Pianka 

 1980). 



ACKNOWLEDGMENTS 



I wish to thank the members of my thesis com- 

 mittee: Hugh DeWitt, John Dearborn, Leslie Wat- 

 ling, and Bernard McAlice. I am grateful to 

 Richard Langton, Northeast Fisheries Center, 

 Woods Hole Laboratory, NMFS, NOAA, Woods 

 Hole, Mass., for critically reading the manuscript. 

 I am indebted to Gilbert Jaeger, Alan Hillyard, 

 Heather Holman, Terry Cucci, and John Stewart 

 for assistance in identifying specimens. Sincere 

 thanks are extended to David Hodges and Mar- 

 garet Hunter for their help in computer pro- 

 gramming. I also wish to thank Jonathan Land 

 for his conscientious laboratory work. The compe- 

 tent assistance of boat captain Michael Dunn is 

 also gratefully acknowledged. Finally, special ap- 

 preciation is given to David Townsend, Richard 

 Shaw, Paul Grecay, and an anonymous reviewer 

 for valuable discussion and comments. 



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