Z
- Zoogeography: - barriers: - East Pacific, 803 
- land, 803 
- Wyville Thompson Ridge, 810, 849 
 
- faunal areas, 273, 799–810 
 
- Zooplankton (see also Plankton), 812–823 - adaptations, 821–823 
- collection and analysis, 378–382 
- neritic and oceanic, 820–821 
- permanent, 816–819 
- production, 934–936 
- relation to physical-chemical environment, 823 
- relation to phytoplankton, 898–904 
- temporary, 814–815 
 
- Zostera (see Eel grass) 
