2024-03-28T13:52:19Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02019588
2023-01-10T02:59:20Z
1642838158423:1642838158860:1642838161909
1642838403551:1642838411479
ウォレス線周辺における海洋生物4種の集団遺伝構造の比較研究
Studies on comparative genetic population structure of four marine or ganisms across the biogeographical barrier, the Wallace Line
Hardianto, Eko
The targeted species in this study are the fiddler crab Austruca perplexa, the shallow water shrimp Acetes sibogae sibogae, the Javanese ricefish Oryziasjavanicus, and the Asian monsoon scallops Amusium pleuronectes has long been of interest to evolutionary biologist because of the high level of species diversity, its wide geographic distribution, and its economic and ecologically importance. Many of these pressures, including increasing sea-surface temperatures, ocean acidification, pollution, legal and illegal overfishing, destructive fishing methods, water diversions, and other environmental shifts have the potential to result in significant loss of specific biodiversity stock, necessitating careful management wherever possible.
Genetic approaches are one tool that can help inform the conservation and management objectives unique to marine systems. Population genetic tools offer an opportunity to elucidate the genetic level (speciation and diversification), patterns of dispersal (connectivity and migration), and demographics (past and present), to better understand species' responses to ecological changes, anthropogenic stressors, and biogeographical
We compare the patterns of genetic diversity and natural population structure in the target species were investigated to gain a better understanding.of its evolutionary history. Samples were collected from Western Pacific Region, especially across the biogeographical barrier, the Wallace line. We characterized sequence variation in an mtDNA control region fragment for all targeted species and microsatellite loci for O. javanicus. The genetic diversity result showed the height haplotype diversity and low nucleotide diversity (for Au. perplexa and Am. pleuronectes), intermediate haplotype diversity and low nucleotide diversity (for Ac. s. sibogae), and both low haplotype and nucleotide diversity (for O. javanicus). Analysis of molecular variance revealed significant genetic differentiation (P < 0.0001) among all sampled sites for both genetic markers accept Am. pleuronectes. Furthermore, the mean fixation indices for both genetic markers were relatively high, indicating that dispersal potential among sites was low and that gene flow had been restricted in the past. This pattern of population structure likely reflects a short pelagic larval life and is associated with very limited dispersal potential, leading to isolation by distance, potentially allowing local adaptation to sites that augment any oceanographic, geographic, or biological barriers to gene flow. The patterns of genetic differentiation resulting from this combination of factors represent a source of evolutionary novelty.
博士(学術)
http://purl.org/coar/resource_type/c_db06
琉球大学
University of the Ryukyus
琉球大学
University of the Ryukyus
2022-09-22
VoR
甲第425号
eng
open access