Light trap catches of Neoperla spio (Newman) (Insecta, Plecoptera) at Jinja, Uganda
1960
Tjønneland, Audfinn
When studying the flight activity of some species of mayflies at Jinja, Uganda in 1956-8, records were also kept of the catches of Neoperla spio (NEWMAN). This stone-fly has a wide distribution in Africa (HYNES, 1952). Little is however known about certain aspects of its biology. And one of the questions that has been raised is -whether the species shows a seasonal or a continuous emergence. My observations, few as they are, might here be of interest. A Robinson mercury vapour light trap, design no. 862769 (ROBINSON, 1952) was employed to attract the insects. The trap was kept in the same position and locality, approximately 150 meters from the shore of Lake Victoria, for the whole of the time when the insects were collected. For details see TJØNNELAND (1960). During the first year (from 14th September 1956 till 6th September 1957) the trap was run every seventh night. The sampling was started at sunset and continued till sunrise the following morning. The trap was emptied every ten minutes, a sampling night yielding seventy two ten-minute samples.
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