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 mesoand 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.
{"title":"Faunal and ecological aspects of aquatic oligochaetes (Annelida, Clitellata) in Japanese lakes","authors":"A. Ohtaka","doi":"10.5179/BENTHOS.73.12","DOIUrl":"https://doi.org/10.5179/BENTHOS.73.12","url":null,"abstract":"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 mesoand 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.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"284 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121490039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Ito, Mana Ito, K. Ohta, K. Ohta, Takeshi Hano, N. Ohkubo, K. Mochida
We studied the environmental remediation of polluted marine sediments using annelids and demonstrated that aquatic annelids had a high potential to lower the concentration of pollutant chemicals. We investigated the seasonal variation of dominancy of a marine oligochaete Thalassodrilides cf. briani(Naididae), which has high tolerance to pollution, in the benthic community in Fukuura Bay, Ehime Prefecture, Japan. In addition, the growth rates of oligochaetes under different temperatures were examined in our laboratory to establish an efficient oligochaete culture system. In the field studies, we investigated annual changes in the abundance and biomass of the oligochaete from 2011 to 2014 in Fukuura Bay. Throughout the investigation period, T. cf. briani dominated more than 60% of the total abundance of benthic communities, except in the winter of 2013 and 2014, and reached 121,400 individuals/m in February 2012. From spring to summer, the average body weight per individual reached a maximum, and the proportion of mature individuals was the highest in summer. These results suggested that new generations of this species occur in summer. In the laboratory experiment, T. cf. briani was cultured at 15, 20, or 25°C , and the growth and maturity rates of individuals with egg sacs were measured. The growth and maturity rates cultured at 15, 20, and 25°C after 30 days were 130% , 138% , and 160% and 1% , 23% , and 71% , respectively. Therefore, we determined that temperatures between 20 and 25°C triggered T. cf. briani maturation, and culture at 25°C was the most effective for inducing maturation.
研究了环节动物对污染海洋沉积物的环境修复作用，发现环节动物具有降低污染物浓度的潜力。本研究调查了日本爱元县福浦湾底栖生物群落中对污染具有较高耐受性的海洋寡毛藻(Thalassodrilides cf. briani, Naididae)优势度的季节变化。此外，本实验还考察了不同温度下寡毛菌的生长速率，建立了高效的寡毛菌培养体系。在野外研究中，我们调查了福仓湾2011 - 2014年寡毛藻丰度和生物量的年变化。在整个调查期间，除2013年和2014年冬季外，布氏夜蛾占底栖生物群落总丰度的60%以上，2012年2月达到12.14万只/m。春季至夏季个体平均体重最大，成熟个体比例在夏季最高。这些结果表明，该物种的新一代发生在夏季。在实验室实验中，分别在15℃、20℃和25℃条件下培养布氏弓形虫，测定卵囊个体的生长和成熟率。在15、20和25℃条件下培养30天后的生长率和成熟率分别为130%、138%和160%，1%、23%和71%。因此，我们确定温度在20 ~ 25℃之间触发briani T. c.b.成熟，25℃培养对诱导成熟最有效。
{"title":"Seasonal variation of the biomass of the marine oligochaete Thalassodrilides cf. briani in Fukuura Bay, Japan and its optimal culture conditions","authors":"K. Ito, Mana Ito, K. Ohta, K. Ohta, Takeshi Hano, N. Ohkubo, K. Mochida","doi":"10.5179/BENTHOS.73.57","DOIUrl":"https://doi.org/10.5179/BENTHOS.73.57","url":null,"abstract":"We studied the environmental remediation of polluted marine sediments using annelids and demonstrated that aquatic annelids had a high potential to lower the concentration of pollutant chemicals. We investigated the seasonal variation of dominancy of a marine oligochaete Thalassodrilides cf. briani(Naididae), which has high tolerance to pollution, in the benthic community in Fukuura Bay, Ehime Prefecture, Japan. In addition, the growth rates of oligochaetes under different temperatures were examined in our laboratory to establish an efficient oligochaete culture system. In the field studies, we investigated annual changes in the abundance and biomass of the oligochaete from 2011 to 2014 in Fukuura Bay. Throughout the investigation period, T. cf. briani dominated more than 60% of the total abundance of benthic communities, except in the winter of 2013 and 2014, and reached 121,400 individuals/m in February 2012. From spring to summer, the average body weight per individual reached a maximum, and the proportion of mature individuals was the highest in summer. These results suggested that new generations of this species occur in summer. In the laboratory experiment, T. cf. briani was cultured at 15, 20, or 25°C , and the growth and maturity rates of individuals with egg sacs were measured. The growth and maturity rates cultured at 15, 20, and 25°C after 30 days were 130% , 138% , and 160% and 1% , 23% , and 71% , respectively. Therefore, we determined that temperatures between 20 and 25°C triggered T. cf. briani maturation, and culture at 25°C was the most effective for inducing maturation.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"225 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115593322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Information for contributors","authors":"","doi":"10.5179/benthos.73.69","DOIUrl":"https://doi.org/10.5179/benthos.73.69","url":null,"abstract":"","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127932921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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.
{"title":"Classification of the genera that belong to the families Enchytraeidae Vejdovsky, 1879 and Propappidae Coates, 1986 (Annelida: Clitellata: Tubificidae)","authors":"Takaaki Torii","doi":"10.5179/benthos.73.35","DOIUrl":"https://doi.org/10.5179/benthos.73.35","url":null,"abstract":"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.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116681535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
伊藤真奈 ・大高明史 ・鳥居高明 ・伊藤克敏 1) 1) 国立研究開発法人水産研究・教育機構瀬戸内海区水産研究所.〒739–0452 広島県廿日市市丸石 2–17–5 2) 弘前大学教育学部理科教育講座.〒036–8560 青森県弘前市文京町 1 3) いであ株式会社環境創造研究所.〒421–0212 静岡県焼津市利右衛門 1334–5 Mana ITO, Akifumi OHTAKA, Takaaki TORII and Katsutoshi ITO 1) National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research and Education Agency, Maruishi 2–17–5, Hatsukaichi, Hiroshima 739–0452, Japan 2) Department of Natural Science, Faculty of Eduation, Hirosaki University, Bunkyo-cho 1, Hirosaki, Aomori 036–8560, Japan 3) IDEA Consultants Inc., 1334–5 Riemon, Yaizu-shi, Shizuoka 421–0212, Japan
伊藤真奈 ・大高明史 ・鳥居高明 ・伊藤克敏 1) 1) 国立研究開発法人水産研究・教育機構瀬戸内海区水産研究所.〒739–0452 広島県廿日市市丸石 2–17–5 2) 弘前大学教育学部理科教育講座.〒036–8560 青森県弘前市文京町 1 3) いであ株式会社環境創造研究所.〒421–0212 静岡県焼津市利右衛門 1334–5 Mana ITO, Akifumi OHTAKA, Takaaki TORII and Katsutoshi ITO 1) National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research and Education Agency, Maruishi 2–17–5, Hatsukaichi, Hiroshima 739–0452, Japan 2) Department of Natural Science, Faculty of Eduation, Hirosaki University, Bunkyo-cho 1, Hirosaki, Aomori 036–8560, Japan 3) IDEA Consultants Inc., 1334–5 Riemon, Yaizu-shi, Shizuoka 421–0212, Japan
{"title":"The current state and prospects of the aquatic oligochaete research in Japan","authors":"Mana Ito, A. Ohtaka, Takaaki Torii, K. Ito","doi":"10.5179/BENTHOS.73.11","DOIUrl":"https://doi.org/10.5179/BENTHOS.73.11","url":null,"abstract":"伊藤真奈 ・大高明史 ・鳥居高明 ・伊藤克敏 1) 1) 国立研究開発法人水産研究・教育機構瀬戸内海区水産研究所.〒739–0452 広島県廿日市市丸石 2–17–5 2) 弘前大学教育学部理科教育講座.〒036–8560 青森県弘前市文京町 1 3) いであ株式会社環境創造研究所.〒421–0212 静岡県焼津市利右衛門 1334–5 Mana ITO, Akifumi OHTAKA, Takaaki TORII and Katsutoshi ITO 1) National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research and Education Agency, Maruishi 2–17–5, Hatsukaichi, Hiroshima 739–0452, Japan 2) Department of Natural Science, Faculty of Eduation, Hirosaki University, Bunkyo-cho 1, Hirosaki, Aomori 036–8560, Japan 3) IDEA Consultants Inc., 1334–5 Riemon, Yaizu-shi, Shizuoka 421–0212, Japan","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129114989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Tsutsumi, T. Nishioka, N. Kitagawa, Y. Fujiyoshi, Moriyuki Kozaki, Mitsuharu Yamamoto, Mutsuo Ichinomiya, Tomohiro Komorita
: Quantitative samplings of the macro-benthic communities were conducted on the sandy tidal flats, Sashiki Tidal Flats, that face Yatsushiro Bay in Kumamoto Prefecture, to monitor the seasonal dynamics of the macro-benthic communities and the population dynamics of the short-neck clam, Ruditapes philippinarum . This clam is one of the most dominant species of the macro-benthic communities on the sandy tidal flats of the Japanese coast. The larvae produced in the autumn breeding season settled on the tidal flats between November and December. The density of the newly settled juveniles reached about 85,000 ind. m − 2 in January 2015, and 4,760 ind. m − 2 of the juveniles with shell length of 2 to 5 mm remained until April. However, the newly recruited cohort almost collapsed between May and June. The same phenomenon was observed on the tidal flats in the spring of 2014. It was, therefore, one of the main reasons why the adult clams were sparse on the tidal flats throughout the year. Our results suggest that the predation pressure caused by ray Hemitrygon akajei and gastropod Philine argentata was a major mortality factor that collapsed the clam population in spring. In spring, numerous dips were created by the rays on the tidal flats. It is likely that the young spats newly recruited in the autumn breeding season are predated on by these predators by the spring of the next year.
{"title":"Seasonal changes in short-neck clam (Ruditapes philippinarum) population and its controlling factors on Sashiki Tidal Flats","authors":"H. Tsutsumi, T. Nishioka, N. Kitagawa, Y. Fujiyoshi, Moriyuki Kozaki, Mitsuharu Yamamoto, Mutsuo Ichinomiya, Tomohiro Komorita","doi":"10.5179/BENTHOS.73.1","DOIUrl":"https://doi.org/10.5179/BENTHOS.73.1","url":null,"abstract":": Quantitative samplings of the macro-benthic communities were conducted on the sandy tidal flats, Sashiki Tidal Flats, that face Yatsushiro Bay in Kumamoto Prefecture, to monitor the seasonal dynamics of the macro-benthic communities and the population dynamics of the short-neck clam, Ruditapes philippinarum . This clam is one of the most dominant species of the macro-benthic communities on the sandy tidal flats of the Japanese coast. The larvae produced in the autumn breeding season settled on the tidal flats between November and December. The density of the newly settled juveniles reached about 85,000 ind. m − 2 in January 2015, and 4,760 ind. m − 2 of the juveniles with shell length of 2 to 5 mm remained until April. However, the newly recruited cohort almost collapsed between May and June. The same phenomenon was observed on the tidal flats in the spring of 2014. It was, therefore, one of the main reasons why the adult clams were sparse on the tidal flats throughout the year. Our results suggest that the predation pressure caused by ray Hemitrygon akajei and gastropod Philine argentata was a major mortality factor that collapsed the clam population in spring. In spring, numerous dips were created by the rays on the tidal flats. It is likely that the young spats newly recruited in the autumn breeding season are predated on by these predators by the spring of the next year.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114253285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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.
{"title":"Aquatic microdrile oligochaete fauna (Annelida, Clitellata) in paddy fields of Japan","authors":"A. Ohtaka","doi":"10.5179/BENTHOS.73.48","DOIUrl":"https://doi.org/10.5179/BENTHOS.73.48","url":null,"abstract":"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.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131882045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Business Report","authors":"Skorczynska Sznajder, Hanna Teresa","doi":"10.5179/benthos.73.67","DOIUrl":"https://doi.org/10.5179/benthos.73.67","url":null,"abstract":"","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127791438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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