Concerns by conservation and wildlife groups about the destruction of grebe nests at Lake Hodges because of fluctuating water levels has caught the attention of water managers and the California Department of Fish and Wildlife. The issue was raised last week in a letter to the city of San Diego, owner of the water storage reservoir just south of Escondido. Recent changes in water levels at the reservoir have resulted in as many as 300 grebe eggs being destroyed because adult birds could not reach the nests after water levels suddenly dropped. Brian Caldwell lives adjacent to Lake Hodges and operates Lake Hodges Photo Tours. He was one of the first to sound the alarm about nests being destroyed.