Uptake and Assimilation of Dissolved Organic Matter by Bosmina longirostris (Crustacea: Cladocera)

Nikki Preston, Illinois Wesleyan University
William Jaeckle, Faculty Advisor, Illinois Wesleyan University

A considerable amount of dissolved organic matter (DOM) exists in freshwater environments (5-40 µ, g/mL). However, freshwater invertebrates, including crustaceans, are viewed as incapable of taking up and metabolically utilizing DOM. We evaluated this hypothesis by exposing the freshwater crustacean Bosmina longirostris to labeled proteins and polysaccharides. Individuals readily ingested these materials as evidenced by the presence of molecule-specific labels in the digestive system. Histological examination of specimens exposed to the protein ferritin revealed that the label was in the lumen of the digestive tract but not in the surrounding cells. Digestion in crustaceans is extracellular, and the absence of a label within cells is not necessarily unexpected. Bosmina longirostris is capable of supplementing its diet of particulate foods through the acquisition and assimilation of DOM from its environment.

 
Apr 10th, 9:00 AM Apr 10th, 10:00 AM

Uptake and Assimilation of Dissolved Organic Matter by Bosmina longirostris (Crustacea: Cladocera)

Center for Natural Science, Illinois Wesleyan University