Abstract
Ecdysteroid titers were determined in tissues (gut plus Malpighian tubules, carcass tissue, fat body, muscles, haemolymph, accessory reproductive glands, and testes) of male adult crickets, Gryllus bimaculatus, during the first 20 days of adult life as well as in spermatophores. In all tissues, except testes, total ecdysteroid titers are high on the day of imaginal moulting and then drop more or less continuously until day 8 after moulting. Distinctly higher levels are found on day 12 and 18 as well. Freshly moulted males contain high quantities of polar ecdysteroid conjugates in the digestive tract, testes, accessory reproductive glands, and haemolymph. Apolar ecdysteroid conjugates are mainly detectable in carcass tissue and fat body, but also in the haemolymph during entire adulthood. Free ecdysteroids represent the domineering class of moulting hormones in the gut during all stages of adult life. The significance of cycling ecdysteroid concentrations during adulthood is discussed in relation to spermatophore production and development of male accessory reproductive glands.
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