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Habitat and food preference and development of B serricauda Fabricius, 1798 and B constrictus Brunner von Wattenwyl, 1878 Phaneropterinae Habitatwahl, Nahrungswahl und Entwicklung von B serricauda Fabricius, 1798 und B constrictus Brunner von Wattenwyl, 1878 Phaneropterinae


Articulata, 172: 51-78
Habitat and food preference and development of B serricauda Fabricius, 1798 and B constrictus Brunner von Wattenwyl, 1878 Phaneropterinae Habitatwahl, Nahrungswahl und Entwicklung von B serricauda Fabricius, 1798 und B constrictus Brunner von Wattenwyl, 1878 Phaneropterinae
The demands of B. serricauda referring to exposure to the sun and temperature are small. For a successful development and reproduction sufficient expose to the sun's rays a few days after hatching and after the adult shedding of skin is necessary. A tie to certain types of wood as a habitat and cracked bark as egg laying media does not exist. The species is modest regarding habitats and occurs in pure spruce woods. The leaves of Fagus sylvatica are not suitable for nourishment. Individuals do not reach the adult phase on copper beech. As an egg laying media soft wood is taken by B. serricauda in 100% of the cases in an experiment of selection. In an experiment of selection B. constrictus lays eggs into the ground just as the species B. yersini and B. ocskayi do. There have to be small twigs or stones on the surface to which the animals can cling while boring in the ovipositor. The ability of B. serricauda to spread can be estimated as low. Changing of place occur mainly in the vertical line up to the tree tops. There are only few occurrences regarding changing of place in the horizontal line. Isolated occurrences, especially in non- pure copper beech woods could exist as isolates for decades up to centuries. The development stages of B. serricauda prefer certain species of deciduous trees and herbaceous plants. In an experiment of selection grasses are not eaten. Ligneous plants are eaten twice as much as herbaceous plants. Adult animals use herbaceous plants as one quarter of their nourishment in an experiment of selection. If being fed herbaceous plants exclusively from the first stage on, adult animals will mate and lay eggs. After 2-3 years the next generation will hatch. B. constrictus can also be brought up exclusively on herbaceous plants. In an experiment of selection coniferous plants are preferred, but those are not essential for the development of the species. The change between strata of individuals of both species obviously doesn't take place because of a necessary change of nourishment, since the animals can reproduce on herbaceous plants alone. The change between strata probably takes place as a result of better acoustic conditions in the tree tops, since fewer disturbing structures can be found there. The females of the Barbistini respond to the stridulating males with a single syllable to a trigger. Disturbing structures can reduce the quality of acoustic communication in this case. Three stages of diapause can occur in eggs of both species. Development up to the final diapause is only possible under the influence of high temperatures and an oviposition before the beginning of the first decade of august. Whether the individual development speed of an embryo runs through an initial and/or intermediate diapause depends on environmental influences on the egg, the parental generation and also endogene factors of maternal origin. B. serricauda and B. constrictus have a development period of 2-3 years, which is only under favourable conditions as short as 1 year. Post-embryonic development proceeds, as with B. versini and B. ocskavi. in six stages.


Accession: 038291047



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