著者
福田 宏
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.56, pp.33-41, 2001-07-15 (Released:2009-08-07)
参考文献数
37
被引用文献数
2 2

The present status of the molluscs of the Suô-nada Sea coast is reported, and conservation of the species diversity there is discussed. This place is exceptional in modern Japan due to its extremely high biodiversity. Few people appreciate the rich biota in these tidal-flat ecosystems, and major destruction there has already begun. For the conservation of the biota of the Suô-nada Sea, it is essential to recognize the relationships between species and their microhabitats, because the habitats of most tidal-flat species are very restricted in space. Here I discuss some major problems in the conduct of environmental assessment studies in Japan, as illustrated by research into the expected impact on the molluscan fauna of the construction of the Kaminoseki Nuclear Power Plant on Nagashima Island. These problems include misidentifications, underestimation of faunal or ecological richness, failure of artificial plantings or mitigation, misleading treatment of the concept of conservation, and emphasis on protection of only a few species useful for human beings. I also discuss the role of amateur researchers in the conservation of tidal flats. Amateurs sometimes can provide new and precise information on the status of species, which is important when there have been recent rapid changes in environmental conditions. On the other hand, amateurs must understand that many species are endangered today and should not be overhunted only for private purposes.
著者
吉岡 志帆 木村 妙子
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.72, no.2, pp.83-93, 2018-03-31 (Released:2018-04-19)
参考文献数
51
被引用文献数
1

The red-eared slider, Trachemys scripta elegans, is a freshwater turtle native to the South Central United States of America and Northeastern Mexico. It was introduced into Japan in the late 1960s and is currently the dominant and widely distributed species throughout the country. The species is salt tolerant, and its distribution has recently expanded into tidal flats; however, its ecology in the tidal flats is unknown. The aim of the present study was to analyze the diet of T. s. elegans inhabiting the tidal flats. We collected 46 individuals from the tidal flats and adjacent freshwater waterway of the Tanakagawa River in the Mie Prefecture in November 2014 and from April to November 2015. We compared the intestinal content of the turtles from both the habitats. They consumed a wide variety of plants and animals in both the habitats, with no difference between the habitats in terms of food intake per body weight. There was a higher ratio of animal to plant matter in juveniles and adults from the tidal flats than that in those from the freshwater waterways. In this animal matter, there was a high incidence of decapod species, such as the tidal flat crabs Helice tridens and Macrophthalmus japonicus. To the best of our knowledge, the present study is the first to suggest that the red-eared slider affects the tidal flat ecosystems by preying on the native tidal flat organisms.
著者
頼末 武史
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.75, pp.19-28, 2020-12-25 (Released:2020-12-24)
参考文献数
101

Since the discovery of deep-sea hydrothermal vent communities in 1977, researchers have made efforts to understand the mechanisms underlying the biodiversity of these communities. “Biodiversity” is hierarchical in nature, ranging from genetic to ecosystem levels and local to regional scales, and encompassing genetic, species, ecosystem, and landscape diversity. A previous paper suggested that interactions between local and regional ecological processes in hydrothermal vent ecosystems could be understood through a metacommunity framework. As a first step toward understanding the complex interactions in these ecosystems, summarizing evolutionary-ecology studies conducted at different hierarchical levels for each vent taxon could be useful. Barnacles are suitable model species for studying evolutionary ecology at various spatiotemporal scales because of the good availability of fossil records, and because of their wide distribution and high potential for laboratory/field-based experiments using both larvae and adults. In this paper, studies on hydrothermal vent barnacles at each hierarchical level of biodiversity are reviewed.
著者
木村 妙子 花井 隆晃 木村 昭一 藤岡 エリ子
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.70, no.2, pp.91-94, 2016-03-31 (Released:2016-10-20)
参考文献数
12

The smooth cordgrass Spartina alterniflora, native to the east coast of North America and the Gulf of Mexico, was first found from Japanese tidal flats in 2008. The species has been reported from Aichi and Kumamoto Prefectures where it settles on tidal flats lower than native reed grass Phragmites australis and other saltmarsh plants. In 2014, the Ministry of Environment in Japan designated all Spartina species as the invasive alien species. While S. alterniflora has been exterminated extensively by local governments, it still has invaded other tidal flats in Japan. We review the situation of S. alterniflora in Japan with the comparison of morphological characteristics of S. alterniflora and P. australis native to Japan for early detection on Japanese tidal flats.
著者
後藤 龍太郎 邉見 由美 Jonel Mangente Corral 塩﨑 祐斗 加藤 哲哉 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.72, no.2, pp.79-82, 2018-03-31 (Released:2018-04-19)
参考文献数
21

Ikedosoma elegans (Ikeda, 1904) (Annelida: Echiura: Thalassematidae) is a rare, large deep-burrowing spoon worm that has been observed only in Japan. This species was first described based on the specimens collected from Misaki, Sagami Bay (Kanagawa Prefecture), eastern Japan, in 1902. Since the first description, this species has not been collected until the recent studies, which reported that I. elegans was collected from Hamana Lake (Shizuoka Prefecture), Boso Peninsula (Chiba Prefecture), and probably Amakusa, Ariake Sea (Kumamoto Prefecture). Furthermore, the specimen collected from Takasu, Seto Inland Sea (Okayama Prefecture) in 1975 was identified to be I. elegans. In this study, we present a new locality of this species in Japan. We collected a large individual of I. elegans with a probably commensal scale worm (Polynoidae: Polynoinae) by using a yabby pump in a mud flat in the Doki River Estuary, which is facing the Seto Inland Sea, in Marugame (Kagawa Prefecture), northern Shikoku Island. To the best of our knowledge, the present study is the first record of I. elegans from Shikoku Island and the second record from the Seto Inland Sea, following a 42-year-old record from Takasu, Okayama.
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.12-34, 2018-08-31 (Released:2018-10-12)
参考文献数
144
被引用文献数
1

The faunal composition and ecology of aquatic oligochaetes (Annelida, Clitellata) in Japanese lakes have been summarized based on a literature survey. Since Annandale’s initial benthological research in Lake Biwa in 1915, aquatic oligochaetes in Japanese lakes were studied, mainly in terms of lake typology, until the 1970s. Subsequent taxonomic and faunal studies have recorded 40 oligochaete species belonging to five families in the profundal bottom of freshwater lakes on Japanese islands. The profundal forms are generally widely-distributed species, with parallel replacement with European species. A variant form of Branchiura sowerbyi, which is almost devoid of posterior gill filaments, is restricted to the profundal bottom in the North basin of Lake Biwa, and is the only unique representative of lake profundal oligochaetes in Japan. Lim­nodrilus hoffmeisteri and Tubifex tubifex were the most common oligochaete species in profundal bottoms, both occurring irrespective of the trophic status of the lake. Unique oligochaete compositions were found in the bottom of several deep and oligotrophic lakes in northern Japan, and often comprised subterranean species. The taxonomic position of Tubifex (Peloscolex) nomurai, which was described from deep profundal bottoms in Lake Tazawa, and became extinct in the 1940s has been discussed. The composition and abundance of oligochaete communities in Japanese dam-lakes are comparable to meso- and eutrophic natural lakes in Japan. Azoic zones occurred in four lakes owing to the acceleration of artificial eutrophication and global warming recently. Oligochaete diversity in Japanese lakes is poorly understood in littoral zones and brackish lakes, and taxonomic studies will reveal many additional species.
著者
鳥居 高明
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.35-47, 2018-08-31 (Released:2018-10-12)
参考文献数
42

To date, there is limited information on the taxonomic composition of enchytraeids in Japan. In this study, keys to and diagnoses for the genera of Enchytraeidae and Propappidae have been provided. The keys cover 25 terrestrial, marine, and freshwater genera that have been recorded and are potentially distributed in Japan, and some local or dubious genera were excluded. The major diagnostic characters used in the keys were as follows: 1. shape of the prostomium; 2. presence/absence and location of dorsal pores; 3. shape and numerical pattern of chaetae; 4. shape and distribution of nephridia; 5. location of the dorsal blood vessel origin; 6. shape of the chloragocytes; 7. abrupt/gradual transition of the esophagus into the intestine, 8. presence/absence, shape, and position, and size of the esophageal appendages; 9. quantity, size, shape, and texture of the coelomocytes; 10. shape of the male funnel; 11. shape of the spermatheca and its attachment (or not) to the esophagus; 12. presence/absence, size, and shape of the testis sacs or seminal vesicles. In addition, the characters of each genus have been described.
著者
熊川 真二 中田 和義 川井 唯史
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.66, no.1, pp.26-32, 2011-10-15 (Released:2012-10-11)
参考文献数
20
被引用文献数
1 1

Official documents and archives suggest that the alien crayfish Pacifastacus leniusculus (Dana, 1852) was introduced into Japan from North America on five occasions from 1926 to 1930, and populations have survived in Hokkaido, Nagano, and Shiga Prefectures. The chemical conditions and biological environment of an established habitat near their original a release point in Akashina, Azumino City, Nagano Prefecture, were surveyed on four occasions in 1998 and 1999. Water quality (pH, DO, BOD) and WT were recorded seasonally at each of eight stations, and crayfish and other aquatic macro-organisms were collected. Some predatory fishes (Oncorhynchus mykiss, Anguilla japonica, and Lepomis macrochirus) that might actively eat juveniles of P. leniusculus were recorded. Individual density of P. leniusculus was relatively low compared to its other habitats in Japan. Only 52 crayfish were collected during this study, on 19 of 32 sampling occasions (eight sites, four times each). The shape of the acumen and the species composition of ectosymbiotic crayfish worms (Annelida: Clitellata: Branchiobdellidae) can be used as tools to trace the origin of introduced of P. leniusculus in Japan. The present crayfish from Nagano Prefecture have a relatively short acumen, different from those of specimens from Shiga and Hokkaido Prefectures. Furthermore, the crayfish worm Xironogiton victoriensis occurs only on crayfish from Akashina, Nagano Prefecture. The dates of introduction of P. leniusculus in Nagano (1926, 1929) also differ from those for Hokkaido (1930) and Shiga Prefecture (1926). These findings suggest that the regional population of P. leniusculus in Nagano has a different origin than those in Shiga and Hokkaido, having originated from crayfish that were introduced independently from North America.
著者
松尾 匡敏 首藤 宏幸 東 幹夫 近藤 寛 玉置 昭夫
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.62, pp.17-33, 2007-07-25 (Released:2010-02-05)
参考文献数
88
被引用文献数
1 1

In April, 1997, construction of a dike in the inner part of Ariake Sound to close off the innermost area of Isahaya Bay was completed. In June of both 1991 and 2002, benthic surveys were conducted using a Smith-McIntyre grab sampler at 88 stations over the entire sublittoral area of Ariake Sound. The structure of the gammaridean amphipod assemblage was compared between 1997 and 2002 with regard to any change in grain-size composition of the substrates and dissolved oxygen concentration of the bottom waters. No noticeable changes were observed in the distribution of the median particle diameter and silt-clay content, nor in the spatial arrangement of the sediment types of the substrates. Hypoxic water masses were observed in the bottom waters in 1997 in and around Isahaya Bay and in the southern part of Ariake Sound. Other studies also recorded hypoxic water masses in the former area in 1999 and 2001. For the amphipod assemblage, a total of 12, 434 individuals of 94 species belonging to 24 families was collected in 1997; the most dominant species was Photis longicaudata (family Isaeidae). In 2002, those values had changed to 37, 649 individuals, 89 species, and 27 families, with the most dominant species being Corophium sp. A (family Corophiidae). In both years, the amphipod assemblage was dominated by six families, including Isaeidae, Ampeliscidae, Corophiidae, Priscomilitaridae, Melitidae, and Aoridae, although the dominance order changed partially. The amphipod assemblage in both years inclusive was divided into eight groups using group-averaged clustering and non-metric multidimensional scaling. The group with the highest number of stations occupied the largest bottom area, composed of poorly-sorted medium to coarse sand along the longitudinal axis of Ariake Sound; the number of stations in this group increased from 41 in 1997 to 57 in 2002. Increase in individual density and expansion of distribution range of seven species of the superfamily Corophioidea (Corophiidae, Isaeidae, Priscomilitaridae), which occurred around the two hypoxic areas, contributed most to the range extension. For the above-mentioned six most dominant families, density of individuals and proportional composition of number of individuals in each of the two hypoxic areas and other, non-hypoxic areas were compared between the two years. In particular, both values remarkably increased for several members of the Corophiidae, including Corophium sp. A and C. crassicorne, in 2002; the exception was the value for density of individuals in the southern hypoxic area. The Shannon-Wiener species diversity index values were lower in 2002 for both the two hypoxic areas and the combined non-hypoxic areas, and for the three main groups of the amphipod assemblage.
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
5

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
五嶋 聖治
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.71, no.2, pp.83-89, 2017-03-31 (Released:2018-04-17)
参考文献数
41
被引用文献数
2

The occurrence of the ghost crab Ocypode stimpsoni was surveyed at 32 beaches within southern Hokkaido, and Itanki Beach at Muroran was detected as the northernmost edge of its range. The burrow distribution of the ghost crab at Omori Beach, Hakodate, near the northern edge, was investigated from January to December 2014. Burrow opening was initially observed in late June near the upper area of the beach with vegetation. The number of burrows increased in the following months, with their distribution extending down the beach. During mid-summer with high temperature, severe dryness of the sand restricted the upper limit of the burrow digging area to immediately below the high-tide water mark with moist sand. The lower limit was determined by excavation of the sand by rough waves, concentrating the burrow area to a narrow band within the beach. In autumn, the dryness decreased and the burrow area extended upward, becoming wider. Burrow activity halted by the end of October. After October, the ghost crab overwintered in deep burrows within the upper area until late next June. These results suggest that at the northernmost edge of the distributional range, seasonal activity patterns are severely restricted by environmental factors such as extreme temperatures, dryness, and rough waves, which is coincident with the general rule of geographical range pattern of organisms. A possibility that the famous poet Takuboku Ishikawa played with the ghost crab at Omori Beach was discussed based on the findings.
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

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
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

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
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

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

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
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

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.