Abstract
Comparison of Records of Baleen Plates and of Ear Plugs in Female Fin Whales, Balaenoptera Physalus (Linnaeus, 1758)
Highlights
Purves (1955, 1958), Laws and Purves (1956) and Purves and Mountford (1959) have given extensive descriptions of the presence of alternating light and dark layers in the ear plugs of baleen whales
Ichihara (1966) started the comparison of the record of the ear plug with the record of the baleen plate at the point where the baleen plate is out of the gum, while for the ear plug he used the complete record, from the part last formed at the epithelium up to the tip of the plug
In both records the sequence of peaks and hollows is the same. This may be reasonably explained by the assumption that factors influencing the mitotic activity in the epidermal tissue which forms the baleen plate, influence the epidermal tissue forming the ear plug
Summary
Purves (1955, 1958), Laws and Purves (1956) and Purves and Mountford (1959) have given extensive descriptions of the presence of alternating light and dark layers in the ear plugs of baleen whales. Their assumption that these layers are seasonal depositions is based on the regular sequence of a feeding season and a non feeding season with migratory movements in between. They have counted the number of layers visible in the core of the ear plug and correlated these with data about the body length of e.g. the fin whales at sexual and physical maturity
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