CONTENTS 



ch. 18. Biological Species, Water-Masses and Currents by M. 

 Johnson and E. Brinton .... 



1. Introduction ..... 



2. Water-masses and biological species 



3. Water currents and biological species . 



ch. 19. Communities of Organisms by E. W. Eager 



1. Introduction 



2. Definition of community 



3. Identification of communities 



4. Community structure . 



5. Community function . 



6. Comm unity theory 



ch. 20. Theory of Food-Chain Relations in the Ocean by G. A 



1. Introduction ...... 



2. Mathematical models of plankton populations 



3. Complex versus simple models 



4. Prognosis for mathematical models 



5. Higher elements of the food chain 



381 

 381 

 383 

 403 



415 

 415 

 418 

 419 

 424 

 429 

 433 



Riley 438 



438 

 439 

 448 

 453 

 455 



ch. 21. Fishery Dynamics — Their Analysis and Interpretation by 

 M. B. Schaefer and R. J. H. Beverton 



1. Introduction .... 



2. The Beverton-Holt approach 



3. The Schaefer approach 



4. Concluding remarks 



464 

 464 

 466 

 475 

 479 



Section V. Oceanographical Miscellanea 



485 



ch. 22. Seasonal Changes in Sea-Level by June G. Pattullo 



1. Introduction ..... 



2. The observed seasonal variations . 



3. Factors influencing variations in sea-level 



4. Summary ..... 



5. Conclusions ..... 



485 

 485 

 485 

 491 

 494 

 495 



ch. 23. Bathyscaphs and Other Deep Submersibles for Oceano 

 graphic Research by R. S. Dietz 



1. Introduction 



2. Diving chambers 



3. Bathyscaphs 



4. Diving saucer 



5. Buoyant-hulled deep ships or bathynauts 



6. Deep-research vessel (D.R.V.) 



7. Remote underwater manipulator (RUM) 



8. Concluding remarks .... 



497 

 497 

 498 

 500 

 507 

 508 

 510 

 511 

 513 



