28171
The biofilm composition , however , did change , as reflected in a decline in cyanophytes and an increment in the proportions of diatoms and chlorophytes ; with Hippodonta hungarica , Navicula novaesiberica , Nitzschia palea , and Sellaphora pupula being the most frequent and abundant species .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None