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Reproductive ecology of the pedunculate barnacle Scalpellum stearnsii (Cirripedia: Lepadomorpha: Scalpellidae)

Published online by Cambridge University Press:  15 February 2008

Yuki Ozaki ,
Yoichi Yusa ,
Shigeyuki Yamato  and
Tohru Imaoka
Yuki Ozaki
Affiliation:
Department of Biological Sciences, Faculty of Science, Nara Women's University, Kitauoya-nishimachi, Nara 630-8506, Japan
Yoichi Yusa*
Affiliation:
Department of Biological Sciences, Faculty of Science, Nara Women's University, Kitauoya-nishimachi, Nara 630-8506, Japan
Shigeyuki Yamato
Affiliation:
Seto Marine Biological Laboratory, Kyoto University, Shirahama, Wakayama 649-2211, Japan
Tohru Imaoka
Affiliation:
Katata 2760-96, Shirahama, Wakayama 649-2201, Japan
*
Correspondence should be addressed to: Yoichi Yusa Department of Biological Sciences Faculty of ScienceNara Women's UniversityKitauoya-nishimachi Nara 630-8506Japan email: yusa@cc.nara-wu.ac.jp
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Abstract

The sexuality of large (non-dwarf) individuals and the characteristics of eggs, larvae and dwarf males were investigated in the pedunculate barnacle Scalpellum stearnsii. All 103 large individuals collected in this study were not hermaphrodites but females. The major length axis of the egg was on average 0.50 mm, which was larger than that in most thoracican barnacles with planktotrophic larvae. The larvae hatched as nauplii and metamorphosed into cyprids without feeding (i.e. lecithotrophic development). There was a positive relationship between body weight and egg mass weight in ovigerous females. The number of males attached per female ranged from 0 to 35 (average: 5.9) and there was a positive relationship between the number of males and female body weight. The distribution of dwarf males was skewed significantly towards the lower part of the occludent margin, which is near the fertilization site.

Keywords

barnacleScalpellum stearnsiireproductiondwarf malelecithotrophydeep sea
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 1 , February 2008 , pp. 77 - 83
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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