A possible effect of obligatory parthenogenesis on the flight activity of some tropical larvo-aquatic insects | Årbok for Universitetet i Bergen Matematisk-naturvitenskapelig serie = Series mathematica rerumque naturalium
1970 | 2021
Tjønneland, Audfinn
It is suggested that obligatory parthenogenesis may lead to a "decay" of the flight activity patterns in tropical species of Trichoptera and Ephemeroptera. Most species of Trichoptera and Ephemeroptera at Jinja, Uganda, fly between Sunset and sunrise. CORBET and TJ0NNELAND (1955) and TJ0NNELAND (1960) have shown that, with a few exceptions, these species have their flight activity peaks at twilight. Some species are eocrepuscular, showing a bimodal activity pattern, while others fly only at dusk or at dawn. Common to most species studied is that the periods of flight activity, as judged by the catches in light traps, are very restricted in time.
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