Acipenseriformes is an endangered primitive fish group, which occupies a special place in the history of ideas concerning fish evolution, even in vertebrate evolution. However, the classification and evolution of the ...Acipenseriformes is an endangered primitive fish group, which occupies a special place in the history of ideas concerning fish evolution, even in vertebrate evolution. However, the classification and evolution of the fishes have been debated. The mitochondrial DMA (mtDNA) ND4L and partial A7D4 genes were first sequenced in twelve species of the order Acipenseriformes, including endemic Chinese species. The following points were drawn from DNA sequences analysis: (i) the two species of Huso can be ascribed to Acipenser; (ii) A. dabryanus is the mostly closely related to A. sinensis, and most likely the landlocked form of A. sinensis; (iii) genus Acipenser in trans-Pacific region might have a common origin; (iv) mtDNA ND4L and ND4 genes are the ideal genetic markers for phylogenetic analysis of the order Acipenseriformes.展开更多
A list of the world wide distribution of Acipenseriformes is given including 32 species and subspecies, their distributions, and conservation levels. Most of the species and subspecies of sturgeons are threatened ...A list of the world wide distribution of Acipenseriformes is given including 32 species and subspecies, their distributions, and conservation levels. Most of the species and subspecies of sturgeons are threatened or endangered in at least some of their habitats. Many are nearing extinction. The threat against sturgeons will continue to grow as the world's population increases. Therefore, the problem of conserving sturgeons and replenishing their stock in the entire range has become urgent for scientists of various countries. Materials given here will be useful for solving this difficult but important problem. The problems concerning the Acipenseridae, such as the investigation of resource classification and biological conservation, are also discussed.展开更多
文摘Acipenseriformes is an endangered primitive fish group, which occupies a special place in the history of ideas concerning fish evolution, even in vertebrate evolution. However, the classification and evolution of the fishes have been debated. The mitochondrial DMA (mtDNA) ND4L and partial A7D4 genes were first sequenced in twelve species of the order Acipenseriformes, including endemic Chinese species. The following points were drawn from DNA sequences analysis: (i) the two species of Huso can be ascribed to Acipenser; (ii) A. dabryanus is the mostly closely related to A. sinensis, and most likely the landlocked form of A. sinensis; (iii) genus Acipenser in trans-Pacific region might have a common origin; (iv) mtDNA ND4L and ND4 genes are the ideal genetic markers for phylogenetic analysis of the order Acipenseriformes.
文摘A list of the world wide distribution of Acipenseriformes is given including 32 species and subspecies, their distributions, and conservation levels. Most of the species and subspecies of sturgeons are threatened or endangered in at least some of their habitats. Many are nearing extinction. The threat against sturgeons will continue to grow as the world's population increases. Therefore, the problem of conserving sturgeons and replenishing their stock in the entire range has become urgent for scientists of various countries. Materials given here will be useful for solving this difficult but important problem. The problems concerning the Acipenseridae, such as the investigation of resource classification and biological conservation, are also discussed.
