SO-CALLED ANEZDYSIS IN BALANUS BALANOIDES AND THE EFFECT OF BREEDING UPON THE GROWTH OF THE CALCAREOUS SHELL OF SOME COMMON BARNACLES
The moulting frcqucncy when IUznus bahoitles is brought into the laboratory and fed at a constant tcmpcrature is roughly the same throughout the year and there is no cvidencc of a major cndogcnous anccdysis comparable with that in many other crustaceans. Variations in the moulting frequency under no...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.538.5285 http://www.aslo.org/lo/toc/vol_7/issue_4/0462.pdf |
| Summary: | The moulting frcqucncy when IUznus bahoitles is brought into the laboratory and fed at a constant tcmpcrature is roughly the same throughout the year and there is no cvidencc of a major cndogcnous anccdysis comparable with that in many other crustaceans. Variations in the moulting frequency under normal seasonal conditions are largely de-tcrmincd by the metabolic reserves, available food, and tcmperaturc, all of which are at a low lcvcl in a borco-arctic winter. There is, howcvcr, a short period immediately following the laying clown of the egg-masses when the moulting frequency is grossly reduced and evidence is presented that this is largely due to a debilitated condition which results from the discharge of reproductive material; this in turn lcads to an uptake of water with a subsequent reduction of feeding activity. For this period the term reproductive anecdysis is suggested. The reduced &ding activity during reproductive anccdysis will largely explain the lower growth rate achieved by breeding animals compared with that of non-breeding animals. |
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