Abstract
The Morabinae of Australia (0rthoptera : Eumastacidae) include species which
come to maturity in the winter and those which do so in the summer; both have high
threshold temperatures for development. For complete development nymphs of
"winter" species require temperatures above 24�C in the later instars of the females, but
"summer" species require high temperatures at all stages and in both sexes.
The eggs require about 7 days of moisture and will then hatch, even if in dry
sand, in about 30 days at 30-35�C; only the eggs of winter species will hatch at temperatures
below 25�C. The eggs lose negligible amounts of water once partly developed.
Water is absorbed until the weight of the egg is about doubled, but saline water is lethal
above about 2% salt concentration and sublethal concentrations delay absorption
of water.
Adults rarely reach population densities greater than one morabine per square
metre. The adults are long-lived, up to 16 weeks in the field and 30 weeks in the
laboratory, and may move as much as 5 m in a week. Morabines have an annual life
cycle with no true diapause. The eggs of some species may spend up to 6 months
in the soil.
Subject
Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics
Cited by
10 articles.
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