Abstract
A study of egg parasitism by zoosporic fungi in a littoral chironomid community was conducted during a single season. Glyptotendipes lobiferus (Say) and Endochironomus nigricans (Johannsen) were the species most abundant as egg masses, accounting for approximately 70% of the total chironomid egg masses collected during most of the study period. While egg masses of E. nigricans were approximately twice as abundant as those of G. lobiferus, larvae of E. nigricans made up a smaller percentage (6.0%) of the total number of larvae compared with G. lobiferus (30.0%). Various fungal parasites and other factors accounted for overall rates of egg mass infection and egg mortality of 55.6% and 15.3%, respectively. Highest levels of parasitism were recorded in egg masses of G. lobiferus (81.1% infection in egg masses, 29.9% mortality in eggs) whereas low levels of parasitism occurred in egg masses of E. nigricans (46.6% infection in egg masses, 7.2% mortality in eggs). Intermediate levels of parasitism were recorded ...
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