| Project/Area Number |
19310150
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Resource conservation science
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| Research Institution | Lake Biwa Environmental Research Institute |
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Principal Investigator |
NISHINO Machiko Lake Biwa Environmental Research Institute, 総合解析部門, 部門長 (60237716)
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| Co-Investigator(Kenkyū-buntansha) |
OHTAKA Akifumi 弘前大学, 教育学部, 教授 (20223844)
IKEDA Minoru 東北大学, 大学院・農学研究科, 准教授 (70232204)
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| Co-Investigator(Renkei-kenkyūsha) |
YAMATO Sigeyuki 京都大学, フィールド科学教育研究センター, 助教 (60230497)
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| Research Collaborator |
KAWAKATSU Masaharu 藤女子大学, 教授
NIWA Nobuaki 神戸市立六甲アイランド高等学校, 教諭
遠山 裕子 東北大学, 大学院・農学研究科, 研究生
WANG Hong-Zhu Institute of Hydrobiology, Chinese Academy of Sciences, Professor
CUI Yong-De Institute of Hydrobiology, Chinese Academy of Sciences, Researcher
WANG Zhi-Young Xiamen University, Professor
CHEN Rong-Bin Xiamen University, Researcher
CHEN Rung-Tsung Endemic Species Research Institute, Graduate student
WU Shi-Kuei University of Colorado at Boulder, Professor/Curator Emeritus
PONCE Leonrodrigo Laboratorio de Zoologica de Invertebrados, Faculted de Ciencias, Professor
VOLONTERIO Odile Laboratorio de Zoologica de Invertebrados, Faculted de Ciencias, Researcher
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
Fiscal Year 2009: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2008: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2007: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
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| Keywords | 生物多様性保全 / 遺伝子汚染 / 外来種 / 淡水エビ / 外部共生 / 共生撹乱 / 共生攪乱 / 陸水環境 / 外来個体群 / ヒルミミズ |
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| Research Abstract |
Recent invasion of taxonomically unsettled atyid shrimp Neocaridina spp. from China into Japan has been suspected through the import as fishing bait. To elucidate this suspicion, the shrimps and their symbionts were collected and analyzed both from Japan and China. Two major haplotype clades were found for Neocaridina spp., based on the sequenced partial CO I and 16SrRNA genes of the mtDNA. Clade I was composed of the haplotypes detected only from Japan, while Clade II was composed of those observed from both countries. Clade II included the haplotypes with identical or few nucleotide differences between Japan and China. This indicates that Clades I and II are assigned to the indigenous lineage in Japan (i.e., N.denticulata denticulata) and the exotic ones from China, respectively. These facts suggest that invasion of Neocaridina spp. from China into Japan has really occurred. In four localities of Japan, the two clades were observed sympatrically, implying the genetic pollution through hybridization or introgression between indigenous and exotic populations. Together with the hearing investigation from exporters and importers of the shrimps, exotic Neocaridina spp. were supposed to have been introduced from the northern and middle part of China, and the symbiotic branchiobdellidan, H. truncatus, recently recorded in central Japan from the middle part of China.
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