366 



COMMUNITY ECOLOGY: 



extinction 



Figure 19.10 The stages and events in biogeogrophical succession. 



PRIMARY BIOSERE 



When an abiotic area opens to life, the consequence 

 is an unstable assemblage of plants and animals, a 

 primary biosere. To a great degree the ecological 



factors of the new area determine the form and spec- 

 ies composition of the primary biosere and further 

 seres. The species composition of the primary biosere 

 may be unique and only remotely related to the areas 

 previously inhabited by the various species. Also, 



