CVClient

高橋 鉄美

Tetsumi Takahashi

基本情報

所属
兵庫県立大学 自然・環境科学研究所 教授 (主任研究員)
学位
博士(1999年12月 北海道大学)

J-GLOBAL ID
202001011489422091
researchmap会員ID
R000010113

委員歴

 2

受賞

 2

論文

 47
  • Shun Satoh, Tetsumi Takahashi, Seiya Okuno, Kento Kawasaka, Mabo Lwabanya
    Fisheries 2024年2月7日  
    We conducted an investigation into ghost fishing, a phenomenon in which abandoned fishing equipment remains operational for extended durations, in the southern region of Lake Tanganyika, Republic of Zambia. The perils associated with ghost fishing have achieved international recognition; however, there exists a conspicuous dearth of scholarly investigations in particular regions, notably inland aquatic environments and developing countries. Employing scuba diving for field observations, we discovered that ghost fishing was solely evident in monofilament nylon nets, despite the presence of four different net types in the littoral area of the lake. Notably, endemic crabs Platythelphusa armata and P. maculata from Lake Tanganyika constituted 65.2% of the organisms captured by abandoned nets, with the remainder comprising various fish species. The number of captured organisms exhibited a dependence on the interplay between the length and mesh size of the abandoned nets, indicating that the risk of ghost fishing is heightened when both net and mesh size are substantial. Furthermore, we encountered predatory Spiny Eels Mastacembelus moorii ensnared in nets around their jaws and teeth. Intriguingly, the digestive tract of one of the Spiny Eels contained a partially digested cichlid species entangled in the same nets, strongly suggesting the occurrence of secondary ghost fishing.
  • Tetsumi Takahashi
    Hydrobiologia 850(10-11) 2385-2392 2022年10月19日  査読有り筆頭著者最終著者責任著者
  • Tetsumi Takahashi, Atsushi J. Nagano, Teiji Sota
    BMC Genomics 22 615 2021年8月  査読有り筆頭著者責任著者
  • Tetsumi Takahashi
    Hydrobiologia 848 3655-3665 2021年  査読有り筆頭著者責任著者
  • Tetsumi Takahashi, Atsushi J. Nagano, Lina Kawaguchi, Norio Onikura, Jun Nakajima, Takuya Miyake, Noriyasu Suzuki, Yoshihiko Kanoh, Tetsuya Tsuruta, Takuya Tanimoto, Yukio Yasui, Noriyuki Oshima, Kouichi Kawamura
    Conservation Genetics 21(4) 641-652 2020年8月  査読有り筆頭著者責任著者
    Rhodeus ocellatus kurumeus is a small cyprinid fish endemic to the Japanese archipelago. This fish frequently hybridizes with an exotic subspecies Rhodeus ocellatus ocellatus, and non-introgressed populations of R. o. kurumeus have greatly decreased. Previous studies based on mitochondrial and nuclear DNA identified introgressed populations and inferred phylogenetic relationships, but these approaches may lead to underestimates of introgression or ambiguous results owing to the small number of genetic markers used. The present study applied double digest restriction site-associated DNA (ddRAD) sequencing to assignment tests and phylogenetic inferences. Data matrices can vary in size and content depending on the strategies used to process ddRAD sequences; therefore, we prepared 25 data matrices with various processing strategies. The assignment tests based on the 25 data matrices resulted in similar assignment patterns and provided evidence for introgression in some populations that had been identified as non-introgressed populations in previous studies. The maximum-likelihood (ML) phylogenetic trees differed in robustness and topology among the 25 matrices; interestingly, ML trees with low statistical support reflected geographical distributions of fish better than ML trees with high statistical support. These results indicate that ddRAD sequencing can detect introgression with greater sensitivity than conventional DNA markers, that ddRAD sequencing is useful for phylogenetic inference among closely related populations within a subspecies, and that statistically robust ML trees do not necessarily reflect the true phylogeny. Application of ddRAD data to conservation genetics and evolutionary history of this subspecies are also discussed.

MISC

 11

書籍等出版物

 6

講演・口頭発表等

 2

担当経験のある科目(授業)

 5

所属学協会

 5

共同研究・競争的資金等の研究課題

 14

学術貢献活動

 2

社会貢献活動

 39