Tuesday, December 11, 2007 - 11:32 AM
0875

Rotifers: Friends or foes of mosquitoes

Anwa L. Bilgrami, bilgrami1956@hotmail.com, Peter Bosak, entoman60@hotmail.com, and Diane Mcnnelly, dmmcnelly@hotmail.com. Department of Mosquito Control, 35 North Rt 47, Dias Creek, P. O. Box 66, Cape May Court House, NJ

Mosquito larvae coexist in water with other microorganisms exhibiting interesting relationships that are not clearly understood. Some interactions are detrimental while others are beneficial and helpful to larval survival. Rotifers, commonly known as ‘Wheel animalcule’, are microscopic, transparent organisms inhabiting mostly fresh-water ponds. The relationship rotifers have with mosquito larvae generates an interesting question as to whether rotifers are friend or foe. During our routine surveillance we collected mosquito larvae with rotifers attached to them. These rotifers were mostly attached to the posterior regions of larvae e.g., abdomen, siphon, saddle and gills. The number of rotifers attached to a single larva varied from a few to hundreds. Rotifers appeared not to harm larvae and were observed drawing in minute food particles that were floating around them. They are so firmly attached that the thrashing movements of larvae do not detach them, although they can detach at will and float away. They extend their body to reach up to the food particles and then retract after sucking the food into their mouth. The relationship between mosquito larvae and rotifers appears phoretic whereby rotifers utilize mosquito larvae as carriers in their search for food.


Species 1: Diptera (mosquito)
Species 2: Rotifers (wheel animalcules)