Abstract
Two life-cycle patterns can be identified in heterospecific or conspecific populations of Dolichopoda cave crickets. One pattern, typical of populations living in artificial caves, is characterized by strong seasonality in the age structure, egg and nymphal diapause and reproductive period. The second pattern, typical of populations inhabiting natural caves, is characterized by absence of such seasonality. These seasonal and aseasonal life cycles also involve demographic differences. In particular aseasonal populations have smaller clutches and larger eggs than seasonal populations. Moreover, studies on several populations revealed that the natural caves tend to hold smaller populations.
Variation in the life-cycle traits of Dolichopoda populations does not fit any geographical cline, but appears to be related to ecological and historical features of individual caves. Particularly, the availability of guano, as a cave-restricted food resource, represents the main factor determining life-cycle variation. Such variation can be interpreted as adaptation to a particular coarse-grained discontinuous landscape, where different cave habitats favour the expression of different life-cycle types.
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Di Russo, C., Carchini, G., Sbordoni, V. (1994). Life-history variation in Dolichopoda cave crickets. In: Danks, H.V. (eds) Insect life-cycle polymorphism. Series Entomologica, vol 52. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1888-2_10
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DOI: https://doi.org/10.1007/978-94-017-1888-2_10
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