1. The seasonal variations in the frequency of moulting of boreo-arctic species of the operculate barnacle Balanus balanoides L. were studied during the years 1954-57 by observing groups of barnacles kept in the laboratory at temperatures corresponding to that of sea water. The rate of moulting, which was about 8 to 12% casts per day per barnacle during October-November, fell sharply by November-December and fertilised animals underwent a period of anecdysis for about 6 to 8 weeks. They resumed moulting at a slower rate, reaching a maximum by May with a slight decrease in June-August, rising again towards the breeding season in November.2. In this species the first cast after the period of anecdysis always contained all tissues of the penis, separated by an abscission layer of new cuticle. Neither food, temperature nor the act of fertilisation were directly responsible for the loss of the penis. The evidence indicates that the loss of the penis is part of a physiological cycle in which gonads undergo rece...
ABSTRACT
PUBLICATION RECORD
- Publication year
1960
- Venue
The Biological Bulletin
- Publication date
1960-02-01
- Fields of study
Biology, Environmental Science
- Identifiers
- External record
- Source metadata
Semantic Scholar
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