||Zur Biologie der Alpinen Gebirgsschrecke, Miramella alpina (Kollar, 1833) (Acrididae: Catantopidae)|
||Roman Asshoff, G. Köhler|
||Jahresbericht der naturforschenden Gesellschaft Graubünden 112:5-18|
To the biology of the alpine grasshopper Miramella alpina (Kollar, 1833) (Acrididae: Catantopinae). - A population of Miramella alpina from Stillberg (2200 m above sea level) near Davos/ Graubünden was observed over two generations in the field and reared under greenhouse conditions. Some hitherto poorly known aspects of juvenile and adult development, reproduction, parasites, food-plants, and embryogenic development have been studied. After hatching in mid June, the juveniles develop over 40-50 days and reach the adult stage towards the end of July. The obligate five juvenile instars are well separated by the length of the postfemora. The adults can survive in the field over 2-3 months. Copulations could be observed from about one week after final molt throughout the whole season, with a maximum in mid August. A female produces about 3 egg-pods with a total of 30 eggs during one season in a subalpine habitat. Nymphs and adults were found to be infested by a fungus (Entomophaga), a nematode (Mermis sp.), and a mite of the genus Eutrombidium.|
About 40 food-plants of M. alpina are known, with a wide spectrum of secondary plant substances. Within the genus Vaccinium leaves of V. uliginosum were preferred to V. myrtillus leaves in early nymphal instars, but this preference diminishes in later instars. The post-diapause development of eggs was broadly scattered, with few eggs hatched.
||Alpine Gebirgsschrecke · Miramella · Life-history · Futterpflanzen · Nymphen-Entwicklung · Reproduktion · Davos|
||Roman Asshoff: email | webpage|
||Treeline tree in a CO₂-enriched world|