Sessile Organisms
Online ISSN : 1883-4701
Print ISSN : 1342-4181
ISSN-L : 1342-4181
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Volume 27, Issue 2
Displaying 1-6 of 6 articles from this issue
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Original article
  • Larval output from barnacles, Amphibalanus amphitrite, settled on a test plate in the Hyogo Canal (Shinkawa), Kobe, Japan.
    Hiroichi Tsukamoto
    Article type: Original article
    2010 Volume 27 Issue 2 Pages 73-76
    Published: 2010
    Released on J-STAGE: November 05, 2015
    DOIhttps://doi.org/10.4282/sosj.27.73
    JOURNAL FREE ACCESS
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    Barnacles have been recognized as fouling organisms for a long time. Adhering to ship hulls, piers, wharves and cooling-water pipes of power stations, they cause significant industrial damage. Nonetheless, barnacle nauplius larvae constitute a significant food source for the larvae and juveniles of various animal species in the coastal ecosystem. In order to evaluate the contribution of fouling barnacles to this larval output, every two weeks in 2008, the author examined the number of brooded eggs of barnacles settled on a test plate hung in the water in the Hyogo Canal, Kobe. Measurements of sea water temperature and salinity at the observation site, the density of barnacle nauplii in the plankton, and the number of settled barnacles on the test plate were made. The number of nauplius larvae hatched from the barnacles settled on the test plate was thereby estimated to be 100,000/cm2 over the whole year.
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Lecture invited
Note
  • The introduced barnacle Megabalanus coccopoma (Darwin 1854) in Tokyo Bay – reexamination of samples collected from lighted buoys in 2004-2005
    Toshiyuki Yamaguchi, Masashi Kiuchi, Ayaka Horikoshi, Ken Okamoto, Hir ...
    Article type: Note
    2010 Volume 27 Issue 2 Pages 89-92
    Published: 2010
    Released on J-STAGE: November 05, 2015
    DOIhttps://doi.org/10.4282/sosj.27.89
    JOURNAL FREE ACCESS
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    The introduced barnacle species Megabalanus coccopoma (Darwin 1854), which was originally described from the Pacific coast of Panama, was recently recorded in Tokyo Bay (Yamaguchi et al., 2009). Following this discovery, we reexamined previously published collection of preserved specimens of Megabalanus taken from lighted buoys in Tokyo Bay in 2004–2005 (Horikoshi & Okamoto, 2007), when M. coccopoma had not yet been recognized in Japan, to clarify whether this species was already present then or not. Among 24 buoys, M. coccopoma was found on 13 nearly throughout distributed the bay, while the indigenous congeneric species Megabalanus rosa (Pilsbry, 1916), the only megabalanid previously reported from these samples, was found on only 9 buoys in the southern part of the bay. Therefore, M. coccopoma must have been introduced to Tokyo Bay before 2004.
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