著者

鈴木 廣志 津田 英治

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

日本ベントス学会誌 (ISSN:02894548)

巻号頁・発行日

vol.1991, no.41, pp.37-46, 1991-09-01 (Released:2009-08-07)

参考文献数

13

被引用文献数

8

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Specimens of the freshwater crab Geothelphusa dehaani (WHITE) were collected at 60 points of Kagoshima Prefecture to study the color variations appeared on the carapace, cheliped, and am-bulatory legs from May to September of 1989. The color variations were fundamentally distin-guished into three types : Blue Type, Red Type, and Brown Type. The color of young crabs were Brown Type and changed into Blue Type or Red Type when the crabs reached more than 14mm in carapace width. Red Type crabs were distributed to the north of Kamino River, Satsuma Peninsula and Kimotsuki River, Oosumi Peninsula, while Blue Type crabs were distributed to the south of these rivers. The predominant carotenoids were lutein, astaxanthin, astaxanthin diester, and astaxanthin monoester in the Red Type crabs, while in the Blue Type crabs they were β-carotene and lutein.

著者

Komai Tomoyuki Mishima Shinji

出版者

Japanese Association of Benthology

雑誌

Benthos research (ISSN:02894548)

巻号頁・発行日

vol.58, no.1, pp.15-30, 2003-06-01

被引用文献数

1

著者

レイモンド 中村 田中 雅生

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

日本ベントス学会誌 (ISSN:02894548)

巻号頁・発行日

vol.1995, no.49, pp.29-37, 1995-08-31 (Released:2010-02-05)

参考文献数

21

被引用文献数

4 4

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九州天草西岸において,潮間帯に棲息するカメノテ,Capitulum mitellaの集団内の個体を1年間にわたり追跡し,サイズと生存の有無を記録した. サイズの指標として峰板の先端と嘴板の先端の距離を測定した.成長曲線については,ロジスチック,ベルタランフィ,ゴンパーツ,指数の4つの曲線を使って適合度を検討したが,指数式が最も合いがよかった.指数式を使って検討を行ったが,成長は集団の内側の個体と外側の個体とで統計的な有意差はみられなかった.内外個体を込みにした指数式のパラメータの値a=1.2902,b=0.008843,t0=80.73であった.1年間の生存率をみると,内側と外側の個体で有意差はみられなかった.内外個体込みの生存率は0.804であった.

著者

伊藤 泰弘

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

日本ベントス学会誌 (ISSN:02894548)

巻号頁・発行日

vol.1994, no.47, pp.23-36, 1994-08-30 (Released:2009-08-07)

参考文献数

25

被引用文献数

1 1

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Two discrete morphological types were recognized among the populations of a boring bivalve, Penitella kamakurensis, based mainly on whether the anterior end of the shell (beak) is pointed (P-type) or rounded (R-type). The relative abundance of the two types varies from place to place according to the hardness of the rock in each locality. P-type individuals are abundant in softer rocks and R-type in harder rocks. In R-type individuals, the width of growth band is narrower, the size of posterior adductor muscle scar is larger, and the shell is thicker than in P-type individuals from the same locality. Individuals of either shell type living in harder rocks show the same tendencies in comparison with those of the same shell type from softer rocks.

著者

HIROMICHI IMABAYASHI HIDETOSHI SAITO CHIAKI OHMASA KOICHIRO KAWAI

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

BENTHOS RESEARCH (ISSN:02894548)

巻号頁・発行日

vol.1996, no.50, pp.11-17, 1996-02-15 (Released:2009-08-07)

参考文献数

20

被引用文献数

1 9

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A unique foraging behavior of the carnivorous polychaete Halla okudai (Lysaretidae) is described in detail. Living bivalves, Ruditapes philippinarum were supplied to adult H. okudai, which were burrowing in sandy sediment in aquariums. The foraging behavior was divided into 4 stages ; responding, searching, handling, and feeding. Responding and searching were considered to be dependent on the olfactory sense, and searching was significantly responsible for the variation in total foraging time. Handling was performed by inhibiting the escape of the bivalve and then opening its shell while secreting a jelly-like material. Bivalve size (23.8-26.3mm shell length) showed a significant correlation to handling time, which ranged from 0.87 to 6.67hr. During feeding, the ploychaete continued to secrete the jelly-like material, which was different in hue from that secreted during handling.

著者

Youichi Seto Yukiko Moriyama Daisuke Fujita Mieko Komatsu

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

BENTHOS RESEARCH (ISSN:02894548)

巻号頁・発行日

vol.55, no.2, pp.85-93, 2000-12-31 (Released:2011-11-11)

参考文献数

17

被引用文献数

2 4

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Abstract: Sexual and asexual reproduction of the fissiparous asteroid Coscinasterias acutispina(Stimpson)was studied in two populations(Kurosaki and Uozu)in Toyama Bay, Sea of Japan, during April 1998-March 1999(Kurosaki)and April 1998-October 1999(Uozu). A total of 96% and 87% of all starfish collected at Kurosaki and Uozu, respectively, showed signs of asexual reproduction by fission. Monthly changes in the ratio of regenerated arm length to maximum arm length revealed that starfish in these populations split most frequently in summer. There was a marked difference in the development of gonads between the two populations. In the Kurosaki population, monthly changes of gonad indices and histological observations on gonads indicated a distinct annual cycle, with a winter spawning season in both males and females. In the Uozu population, gonad indices remained low, and no starfish with mature gonads were observed during the study. An unbalanced sex ratio was observed in both populations; the Uozu population was composed entirely of males. The absence of mature gonads and the extremely biased sex ratio suggest that larval recruitment was low or absent in the Uozu population.

著者

中村 レイモンド 田中 雅生

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

日本ベントス学会誌 = Benthos research (ISSN:02894548)

巻号頁・発行日

vol.49, pp.29-37, 1995-08-31

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九州天草西岸において,潮間帯に棲息するカメノテ,Capitulum mitellaの集団内の個体を1年間にわたり追跡し,サイズと生存の有無を記録した. サイズの指標として峰板の先端と嘴板の先端の距離を測定した.成長曲線については,ロジスチック,ベルタランフィ,ゴンパーツ,指数の4つの曲線を使って適合度を検討したが,指数式が最も合いがよかった.指数式を使って検討を行ったが,成長は集団の内側の個体と外側の個体とで統計的な有意差はみられなかった.内外個体を込みにした指数式のパラメータの値a=1.2902,b=0.008843,t<SUB>0</SUB>=80.73であった.1年間の生存率をみると,内側と外側の個体で有意差はみられなかった.内外個体込みの生存率は0.804であった.

著者

Minoru Ikeda Toshiya Suzuki Yoshihisa Fujio

出版者

JAPANESE ASSOCIATION OF BENTHOLOGY

雑誌

BENTHOS RESEARCH (ISSN:02894548)

巻号頁・発行日

vol.53, no.1, pp.47-52, 1998 (Released:2009-08-07)

参考文献数

20

被引用文献数

5

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Genetic differentiation among five populations of the Japanese freshwater crab Geothelphusa dehaani, each comprising one of three different body color types, dark brown (RE), dark purplish brown (DA), and grayish blue (BL), was examined by means of electrophoretic analysis of 16 enzyme loci. Allelic replacement was observed between the BL-type population and populations of the other two types (RE and DA) at three loci (α Gpd, Gpi, and Sod-1), but not between the RE-and DA-type populations. The average of Nei's genetic distance (D) was 0.035 between the RE and DA populations (range of 0.013-0.061), 0.251 between the RE and BL populations (0.244-0.260), and 0.296 between the DA and BL populations. These results suggest that the BL type is only distantly related to the other two color types (RE and DA).