23 



Fig. 5 b. Print-out of the first page of the results of the matrix program. Numbers in headings 

 of columns are index numbers corresponding to species code numbers of 139 abundant species. 



been taken with the first two, but were taken jointly with other species and 

 combinations more frequently at other stations. Eventually, with nearly 

 20 million operations, every species and combination of species was com- 

 pared with every other species and combination at every station (See fig. 

 5b). Altogether, 53 species were found to be affiliated with a minimum 

 of six others in the first matrix of species with more than 8 station oc- 



