18488
These experimentally observed atrazine - induced decreases of r and K were used to parameterize a Rosenzweig - MacArthur model representing a simple food chain including the tested diatom and its grazer , the harpacticoid copepod Delavalia palustris var . palustris .
 Chemical: atrazine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: atrazine