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A progress report on insect emergence at Findley Lake during 1972
The preliminary results of a study of the insect emergence at Findley Lake in the Cascade Mountains of Washington during 1972 are presented. Bottom samples were taken from different regions of the lake to compare
the insect emergence at the surface, the physical conditions of the bottom,
and the biological communities within the bottom sediments. Those insects that have both an aquatic larval stage and an adult flying stage in their life cycles were collected when they emerged from the lake by ten floating and ten shore-emergence traps.
The insects were identified to family, then counted, dried, weighed, and the total biomass that emerged was determined. Graphs were constructed showing the biomass that emerged per day for those orders and families that contributed more than one percent of the total biomass. The dominant insects were
Trichoptera (Limnephilidae), Diptera (Tendipedidae and the culicid genus
Chaoborus), and Ephemeroptera (Baetidae). There were two main periods of
emergence, one consisting mainly of Diptera a few days after the ice melted off the lake in early July, and another consisting mainly of
Trichoptera in late August and early September. The greatest insect emergence
was near the inlet streams that provided undecomposed plant material to the lake