Sessile Organisms

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 年 23 巻 2 号 p. 1-12
発行日: 2006/08/25
公開日: 2009/10/09

DOIhttps://doi.org/10.4282/sosj.23.2_1

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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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外来付着動物と特定外来生物被害防止法

岩崎敬二

2006 年 23 巻 2 号 p. 13-24
発行日: 2006/08/25
公開日: 2009/10/09

DOIhttps://doi.org/10.4282/sosj.23.2_13

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港湾環境における付着生物群集の捉え方

古川恵太

2006 年 23 巻 2 号 p. 25-31
発行日: 2006/08/25
公開日: 2009/10/09

DOIhttps://doi.org/10.4282/sosj.23.2_25

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港湾環境における付着生物は、港湾構造物 (防波堤や護岸、桟橋等) の材料の劣化に関係があるものとして、それを付着させない技術開発等が行われてきた。その状況の転機となったのが、関西国際空港の緩傾斜護岸で行われた藻場造成である。その後、シーブルー事業やエコポート政策、自然再生事業等が進められ、生態系との共生のための生物生息場の創出を命題として、藻場再生への多角的な取り組みや、サンゴ着生を目指した防波堤設計や移築技術の開発、さらには、付着生物を指標とした場の評価法の開発などに取り組んできた。

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アカフジツボ幼生飼育条件に関する検討

吉村えり奈, 野方靖行, 坂口勇

2006 年 23 巻 2 号 p. 33-37
発行日: 2006/08/25
公開日: 2009/10/09

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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フジツボ幼生の簡便な飼育方法について

吉村えり奈, 野方靖行, 坂口勇

2006 年 23 巻 2 号 p. 39-42
発行日: 2006/08/25
公開日: 2009/10/09

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 年 23 巻 2 号 p. 43-46
発行日: 2006/08/25
公開日: 2009/10/09

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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研究情報

2006 年 23 巻 2 号 p. 47-54
発行日: 2006/08/25
公開日: 2009/10/09

DOIhttps://doi.org/10.4282/sosj.23.2_47

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文献情報

2006 年 23 巻 2 号 p. 55-57
発行日: 2006/08/25
公開日: 2009/10/09

DOIhttps://doi.org/10.4282/sosj.23.2_55

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