Premolt and vitellogenesis are mutually exclusive events in the wild population of the brachyuran crab, Metopograpsus messor; active vitellogenesis occurs only in intermolt females, at a relatively low ecdysteroid profile, judged from radioimmunoassay. Bilateral eyestalk ablation, however, has resulted in simultaneous precipitation of premolt and ovarian growth in the same crab, thus severing the normal antagonistic programming of these two high-energy demanding processes. This result argues for the necessity of eyestalk principles in maintaining the normal (antagonistic) programming of growth and reproduction in the species. Ovaries of the eyestalk ablated crabs precociously accumulate yolk and the oöcytes could attain the size of a fully grown egg within 10 days post-ablation. The eyestalk ablated females have also shown dramatic rise in haemolymph ecdysteroid levels, even surpassing the levels (P < 0.05) of the normal premolt individuals, revealing that ovarian growth can occur under a high ecdysteroid titre in M. messor. It remains to be seen whether the precociously grown ovaries were influenced by the elevated ecdysteroid titer.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 27 • No. 2