terminal; new options can be added easily; and routine periodic updates of the 

 data base are easily made. This gives the biologist the use of a sophisticated 

 computerized software system as a research tool. 



e. Capabil i ties 



(1) Data Storage 



(a) Physical-chemical data (by area, station, date, time of day, and depth) 

 -dissolved oxygen, color, turibidty, Secchi disk depth, temperature, pH, 



river flow, rainfall, bottom type 

 -nitrate, phosphate, ammonia, water-column productivity 



(b) Fish and invertebrate data (by area, station, date, and time of day): 

 -genus and species, number of individuals, mean size (with standard 



deviation), biomass (ash-free dry wt.), sex (invertebrates only) 



(c) Plant data (by area, station, date, and time of day): 



-genus and species, total wet and dry weight stems and roots (wet and 

 dry weight), tops (wet and dry weight) 



(2) Data Processing 



(a) Retrieval 



-for any area, station or group of stations, date or range of dates 



(b) Sorting 



-by area, date, station, time of day, or any combinaton of these 

 -biological data sorted by species 



(c) Calculation of biological indices (based on numbers of individuals or 

 biomass per species for any area, station or group of stations, date or 

 range of dates, or time of day): 



-Species Richness (number of species, Margalef Index) 



-Species Diversity (Simpson index, Brillouin Index, Shannon Index, 

 Mclntosh/indices, Hurlbert's E(Sn)) 

 -Species equitablity (Brillouin J,' Shannon J') 



(3) Graphics 



-for any area, station or group of stations, range of dates, or time of 

 day): plotted as a function of time or any other variable 



-all physical chemical variables 

 -fish and invertebrates 



a) number of individuals (single species or collective total) 



b) average size 



c) dry weight biomass (single species or collective total) 



d) number of species 

 -plants 



a) dry weight biomass (single species or collective total) 



b) number of species 



-Versatec high-resolution electrostatic plotter 



(4) Statistics 



-for virtually any set(s) of numbers that can be generated by any other 

 routine in the system 



136 



