著者

邉見 由美 塩﨑 祐斗 山守 瑠奈 伊谷 行

出版者

日本ベントス学会

雑誌

日本ベントス学会誌 (ISSN:1345112X)

巻号頁・発行日

vol.74, no.1, pp.35-40, 2019-08-31 (Released:2019-09-09)

参考文献数

41

被引用文献数

1

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Pseudopinnixa carinata (Crustacea: Decapoda: Varunidae) is a monotypic rare brachyuran endemic to the Japanese coast. Seventeen specimens of the crab were collected from tidal flats in Yamaguchi and Kochi Prefectures, Japan. The collection from Kochi Prefecture sets a new record from the Pacific coast of Shikoku. A review of P. carinata collection sites and the habitat information revealed that the species is widely distributed in Honshu, Shikoku, and Kyushu, but has never been collected in the Ryukyu Islands and southern Kyushu. This crab inhabits intertidal to subtidal sandy sediments with its deepest record being at 55 m depth. Several studies have shown that the crab was collected from sediments where burrowing invertebrates were abundant. Crabs have been found inside burrows of the echiuran Urechis unicinctus, the gebiidean shrimp Upogebia sakaii, and the axiidean shrimp Nihonotrypaea japonica by digging sediments. In this study, some specimens were pulled out from the burrows of N. japonica and other callianassid shrimp species as well as those of the polychaete Arenicola brasiliensis by yabby pumps.

著者

宮園 章

出版者

日本ベントス学会

雑誌

日本ベントス学会誌 (ISSN:1345112X)

巻号頁・発行日

vol.61, pp.45-52, 2006-07-28 (Released:2009-08-07)

参考文献数

30

被引用文献数

3 3

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Hanging culture of Japanese scallops (Mizuhopecten yessoensis) constitutes the most important fishery in Funka Bay, located in the southeastern part of Hokkaido, Japan. Scallop culture started in the early 1970s and developed into an important industry involving scallop processing and distribution not only as locally important industries, but also as a pillar of the Hokkaido economy. The carrying capacity of scallops cultured in Funka Bay was estimated in 1977-1978 for the first time; after that, however, cultured scallop production continued to increase year by year owing to failure to control on the basis of this estimate. At present, scallop production far exceeds the carrying capacity. The carrying capacity model used to calculate that early estimate was based on the difference between food production and food consumption in the scallop culture area. Controllability of product size and quarity is a marked characteristic of mariculture. I have incorporated the idea into the old 1977-78 model. A new model proposed herein will be useful as educational tools for businesses involved in scallop culture. The huge number of scallops hanging in the coastal area, where their culture areas occupy 19% of the total area of Funka Bay, undoutedly has important ecosystem-level effects in the bay. We need to assess the ecosystem-level effects of the scallop culture and devise a new standard of carrying capacity estimation in order to improve the sustainability of this fishery.

著者

大高 明史

出版者

日本ベントス学会

雑誌

日本ベントス学会誌 (ISSN:1345112X)

巻号頁・発行日

vol.73, no.1, pp.48-56, 2018-08-31 (Released:2018-10-12)

参考文献数

54

被引用文献数

1

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Forty taxa of aquatic microdrile oligochaetes (Annelida, Clitellata) that belong to three families were recorded in inundated rice paddies in Japan on the basis of faunistic survey in 81 localities. To our knowledge, three naidine species, Bratislavia dadayi, Dero nivea, and Aulophorus hymanae, are new to Japan. The oligochaete assemblages primarily consisted of widely distributed and thermophile species and were often dominated by desiccation-tolerant species such as Aulodrilus limnobius, Bothrioneurum vejdovskyanum, and Branchiura sowerbyi. The faunal characteristics have been discussed in relation to rice paddy environments.

著者

内田 紘臣

出版者

日本ベントス学会

雑誌

日本ベントス研究会連絡誌 (ISSN:1883888X)

巻号頁・発行日

vol.1983, no.24, pp.1-23, 1983-03-31 (Released:2010-02-05)

参考文献数

39

被引用文献数

1 7

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Many species of polynoids have been famous for the "conrnensal" habit among Polychaeta. The author can count 274 species of cornmensal (or may be commensal) Polychaeta in 34 different families in literature, and 40% of them in polynoids. They are classified into three ranks. Rank A is for the Polychaetes almost always foufhd in commensal condition with hosts. Rank B is for the species not only frequently found in commensal but also in free living condition. Rank C is for the species almost free living, bur sometimes in commensal. The polychactes of strong tendency toward commensal life (A+B=t) are 154 species, and the species of the family Poiynoidae are half of them (72 species).Many groups of marine organisms are well known as involving of many commensal or parasitic species. But almost all the groups are classified as the differentiated or modified situation rather than the primitive one in each higher taxa. Polynoidae is said to one of the most primitive families in Polychaeta, and it is the largest family in Polychaeta. This is he most peculiar point of Polynoidae comparing with other commensal groups. But commensal condition of Polynoe dae is rather similar to that of the shrimps of the family Alpheidae.The setal modifications for comtneusal life in polynoids may be three characters. 1) Basal cusp in neurosetae, 2) Hook-shaped neurosetae to anterior parapodia, 3) short, stout neurosetae with reduced teeth on their free margin. Many genera known to contain commensal species, are applicable to some of three characters mentioned above, but some genera dissatisfy any of those. In opposition, two genera, weberia Horst 1915 and Paraholoepidella Pettibone 1965 never rerorded commensalism, satisfy the third character, therefore, these two genera my be commensas. Adaptive color patterns are also conspicuous in many species. Ventral lamellae aid unusual development of ventral cirri are also characteristic in some commensal species.Poiynoid comensals can be divided into two types, lodging type and clinging type. The former is for the species living in tubes or burrows of polychaetes, holothurians and other marine organisms. The latter is for the species clinging on the body surface of echinoderms, alcyonarians, etc. Polynoids of the subfamily Lepidonotinae prefer to lodging type, and that of the subfamily harmat;loinae to clinging type. Therefore, the range of host types are different between two subfamilies. The species in Lepidonotinae frequently prefer to sedentary polychaetes as theirr hosts, the other hand the species in Harmothoinae usually prefer to echinoderms and anthozoans.It seers reasonable that morphological and color adaptive changes for commensal life are necessary for the clingings rather than the lodgings. Therefore, Hamothoinae has more adaptive modifications in setal morphology or ventral structures than Lepidonotinae.Furthermore, the former has more genera consisted of only commensal species than the latter.

著者

山川 紘

出版者

日本ベントス学会

雑誌

日本ベントス研究会連絡誌 (ISSN:1883888X)

巻号頁・発行日

vol.1978, no.15-16, pp.41-46, 1978-04-30 (Released:2009-08-07)

参考文献数

7

著者

中田 和義 永野 優季 大橋 慎平 河合 俊郎 大高 明史

出版者

日本ベントス学会

雑誌

日本ベントス学会誌 (ISSN:1345112X)

巻号頁・発行日

vol.69, no.2, pp.90-94, 2014-12-31 (Released:2016-02-06)

参考文献数

24

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In Lake Akan, Hokkaido, northern Japan, the local population of the native and endangered Japanese crayfish Cambaroides japonicus (De Haan, 1841) is extinct, whereas the signal crayfish Pacifastacus leniusculus (Dana, 1852), an invasive species from North America, has become established and rapidly increased. This study provides information about specimens of C. japonicus preserved by Dr. Saburo Hatta from the lake in 1872. The six specimens (two males and four non-ovigerous females) are valuable evidence of C. japonicus formerly inhabiting Lake Akan. The body sizes of the specimens were 24.4–29.5 mm in carapace length and 55.7–67.4 mm in total length, and the estimated age of the largest specimen was ten years, indicating that Lake Akan of that time provided a suitable habitat. Twenty-two ectosymbiotic crayfish worms (Annelida, Clitellata, Branchiobdellida) were found attached to the specimens. Three branchiobdellidan species were identified: Cirrodrilus cirratus Pierantoni, 1905, C. inukaii (Yamaguchi, 1934) and C. megalodentatus (Yamaguchi, 1934). This is the first record of the latter two species from Lake Akan.

著者

岡本 直子 逸見 泰久

出版者

日本ベントス学会

雑誌

日本ベントス学会誌 (ISSN:1345112X)

巻号頁・発行日

vol.57, pp.75-78, 2002-06-27 (Released:2009-08-07)

参考文献数

8

被引用文献数

1 1

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The reproductive strategy of the parasitic isopod Onisocryptus ovalis in the luminescent ostracod Vargula hilgendorfii was studied at a beach in Kumamoto Prefecture, Japan, and in the laboratory, mainly from April 2000 to May 2001. Onisocryptus ovalis is a protandrous hermaphroditic species and changes from a mobile male to an immobile female that loses most of its appendages and has a sack-like body. Male parasites O. ovalis invade female hosts V. hilgendorfii, eat the host eggs, change sex, produce eggs, and die after the eggs have hatched. Some parasites invade immature or male hosts, but move to female hosts immediately afterwards. The percentage of hosts parasitized by O. ovalis was low (0-18%) from summer to autumn, but increased greatly (28-91%) from winter to spring mainly because of a shortage of hosts. Usually, one or two male parasites were found in a host, and only one male of them changed sex. From winter to spring, however, up to 8 male parasites were found in a host and a maximum of five changed sex. The most adaptive parasitic strategy of O. ovalis seems to fertilize eggs as a male as many times as possible, and then to produce more eggs as the only female in a host, although these parameters are not available at present.

著者

西田 睦

出版者

日本ベントス学会

雑誌

日本ベントス研究会連絡誌 (ISSN:1883888X)

巻号頁・発行日

vol.1980, no.19-20, pp.48-50, 1980-05-31 (Released:2009-08-07)

著者

大隅 大 弥益 輝文

出版者

日本ベントス学会

雑誌

日本ベントス学会誌 (ISSN:1345112X)

巻号頁・発行日

vol.55, pp.9-14, 2000-07-25 (Released:2009-08-07)

参考文献数

3

被引用文献数

1 3

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Specimens of the nudibranch Gymnodoris nigricolor were found on the fins of three gobiid fish species, Amblyeleotris ogasawarensis, Ctenogobiops pomastictus, and C, feroculus, near Oujima and Sesoko Islands, Okinawa, in February and May, 1994. These gobiids inhabit the burrows of snapping shrimps. The nudibranchs could be found attached to any fin (caudal, dorsal, pectoral, anal, and pelvic fins) of these fish, and they appeared to feed on a portion of the fin membrane together with one or two of the adjacent fin rays. In the laboratory, G. nigricolor also attached to a free-living gobiid fish, Bathygobius cocosensis. Nudibranchs gathered in glass tubes that had been used as refuges by A. ogasawarensis and C. pomastictus. This suggests that the nudibranchs were attracted to substances that had originated from the fish and remained in the tubes. The nudibranchs did not always attach to the fins of test fish, and individuals that did so detached themselves 1-2 days later. Their association with the fish thus appears to be a predator-prey interaction. Spawning of Gymnodoris nigricolor was observed in a rearing tank. About 200-700 eggs of 0.15 mm in diameter were found in each egg mass. Embryos hatched 10-11 days after oviposition at 24°C.