Sessile Organisms
Online ISSN : 1883-4701
Print ISSN : 1342-4181
ISSN-L : 1342-4181
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Volume 23, Issue 2
Displaying 1-8 of 8 articles from this issue
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  • The shallow-water barnacles (Cirripedia, Balanomorpha) of Bahía de La Paz, Baja California Sur, México, including seven previously unrecorded species and amended descriptions of three species
    Liza Gomez-Daglio, Enrique González
    2006 Volume 23 Issue 2 Pages 1-12
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_1
    JOURNAL FREE ACCESS
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    Characters of the opercular and parietal calcareous plates are commonly used in formulating barnacle descriptions and discussing their taxonomy. However, in some groups these characters have created taxonomic confusion due to a high level of intraspecific variability. We redescribe the shallow-water balanomorph barnacles from Bahía de La Paz in Mexico for which the original descriptions were incomplete or did not include the arthropodal parts. The descriptions present here are based on classical characters derived from calcareous plates (external features) as well as internal characters derived from flexible cuticular body parts such the cirri and parts of the oral cone. The latter character set proved helpful in resolving taxonomic confusion among some of the barnacle species studied. Detailed redescriptions of three species from three genera are presented, along with remarks on their distribution ranges.
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  • Introduced sessile animals and Invasive Alien Species Act in Japan
    Iwasaki Keiji
    2006 Volume 23 Issue 2 Pages 13-24
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_13
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  • How is sessile organisms' community treated in port and harbour environment?
    Keita Furukawa
    2006 Volume 23 Issue 2 Pages 25-31
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_25
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    Sessile organisms have been thought as related on material deterioration of port and harbour structures. Thus, prevention of sessile organisms is one of main objectives for research and development in this area. Success of macro algae transplantation on mild slope sea wall surrounding Kansai International Airport changed the situation drastically. “Sea Blue Project” and “Eco-Port Policy” followed by “Ecosystem Restoration Work” promotes implementation of symbiosis with ecosystem in port and harbour environment. Multi objective restoration of macro algae habitats, break water design for coral habitat recruitment, and environment assessment using sessile organisms as a indicator are now a new R/D target.
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  • Experiments on rearing the barnacle Megabalanus rosa to the cyprid stage in the laboratory
    E. Yoshimura, Y. Nogata, I. Sakaguchi
    2006 Volume 23 Issue 2 Pages 33-37
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_33
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    In order to develop a culture method for larvae of the major fouling barnacle Megabalanus rosa, we examined the effects of food concentration and larval density on the naupliar larval development and metamorphosis into the cyprid. When nauplius larvae were cultured with the diatoms Chaetoceros gracilis and/or Skeletonema costatum at different concentrations, metamorphosis rates to the cyprid increased with the diatom concentration up to 60×104cells/ml. Naupliar survival rates and metamorphosis rates to the cyprid decreased with increasing larval density when nauplii were cultured at 20°C with 60×104cells/ml of the diatom mixture. From these results, it appears that larval density should be kept below 2 larvae/ml, and food concentration above 60×104cells/ml, during mass culture of M. rosa larvae.
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  • Simple methods for mass culture of barnacle larvae
    E. Yoshimura, Y. Nogata, I. Sakaguchi
    2006 Volume 23 Issue 2 Pages 39-42
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_39
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    In this paper we describe simple culture methods for barnacle larvae that do not involve changing the culture seawater during rearing to the cyprid stage. Larvae of the barnacles Amphibalanus amphitrite and Fistulobalanus albicostatus were reared under three different conditions: 1, the culture seawater was changed every day; 2, the culture seawater was not changed, but modified Provasoli Erd-Schreiber medium for diatoms was added to it; and 3, the culture seawater was not changed but the diatom medium and antibiotics (penicillin G and streptomycin) were added to it. Larvae of both barnacle species cultured without changing the seawater grew sufficiently well and metamorphosed into cyprids. Using the same method, cyprids of Megabalanus rosa were reliably produced. Therefore, a maintenance-free culture method that adds diatom medium and antibiotics into the rearing water can be effective in producing large amounts of cyprids.
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  • Effect of emetine, a protein synthesis inhibitor, on larval tail resorption in the ascidian Halocynthia roretzi
    Kiyotaka Matsumura, Manami Nagano, Sachiko Tsukamoto, Haruko Kato, Nob ...
    2006 Volume 23 Issue 2 Pages 43-46
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_43
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    Ascidian tadpole larvae settle and metamorphose after a free-swimming period, and one of the typical morphological changes during metamorphosis is tail resorption. Halocynthia roretzi larvae cannot metamorphose for 6hrs after hatching even in the presence of metamorphosis inducers, which suggests that some internal changes occur in the larvae during this period. Larval protein synthesis was examined as one possibility by using a protein synthesis inhibitor, emetine. When tadpole larvae just after hatching were incubated with 5-10μM emetine, tail resorption did not occur. In contrast, larvae that were treated after a free-swimming period of 8 or 24hrs underwent tail resorption, although some were abnormal. These results suggest that protein synthesis during the swimming period is necessary for tail resorption.
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  • Information
    2006 Volume 23 Issue 2 Pages 47-54
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_47
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  • List of papers
    2006 Volume 23 Issue 2 Pages 55-57
    Published: August 25, 2006
    Released on J-STAGE: October 09, 2009
    DOIhttps://doi.org/10.4282/sosj.23.2_55
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