Factors affecting wing length and emergence in the winter stonefly Capnia nana

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Brachyptery was found to occur in several Rocky Mountain species of Capnia (Plecoptera, Capniidae), especially in the southern regions at the higher altitudes. Capnia nana was found to exhibit all degrees of wing development from fully longwinged to almost completely wingless and because of this was investigated further in an attempt to determine some of the factors which might influence this phenomenon. Emergence of adults can be shown to be directly affected by altitude and water temperature as there is a delay of several months at higher altitudes and at lower temperatures. However, the various environmental factors discussed have not shown a direct and immediate influence on the wing development of individuals. The factors may account for minor variations in wing length, and probably did in the past, but it has become apparent from this study that the populations exhibiting different wing lengths are probably genetically different and that this is the factor which largely determines wing size at the present time.

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Reference Code: A67NEB02IDUS

Full Citation: Nebeker, A. V., and A. R. Gaufin. 1967. Factors affecting wing length and emergence in the winter stonefly Capnia nana. Entomological News 78(4): 85-92.

Location: ANIMAL EF: INSECTS - PLECOPTERA