银鱼是我国重要的经济鱼类,为了解云南杞麓湖和星云湖银鱼群体的遗传多样性与遗传结构,经PCR扩增与测序获得653 bp COI和1205 bp Cytb基因序列。COI基因39条序列共检测到5个单倍型,单倍型多样性、核苷酸多样性、平均核苷酸差异数分别为0...银鱼是我国重要的经济鱼类,为了解云南杞麓湖和星云湖银鱼群体的遗传多样性与遗传结构,经PCR扩增与测序获得653 bp COI和1205 bp Cytb基因序列。COI基因39条序列共检测到5个单倍型,单倍型多样性、核苷酸多样性、平均核苷酸差异数分别为0.323±0.093、0.00060±0.00020、0.39406。Cytb基因38条序列共检测到6个单倍型,单倍型多样性、核苷酸多样性、平均核苷酸差异数分别为0.413±0.097、0.00102±0.00033、1.22760。COI和Cytb基因的AMOVA分子变异显示群体内的方差组分比率(92.39%,87.03%)大于群体间的方差组分比率(7.61%,12.97%),显示遗传变异主要发生在群体内;且群体间存在中度遗传分化和基因流。COI系统发育树显示杞麓湖和星云湖银鱼序列同新银鱼属未定种、太湖新银鱼和陈氏新银鱼聚为单系支;Cytb树显示两湖银鱼序列同太湖新银鱼和陈氏新银鱼聚为单系支,支持率为100%。单倍型网络图显示两湖银鱼群体的所有单倍型并没有单独聚在一起。此外,COI基因的中性检验和核苷酸错配分布结果显示杞麓湖和两个湖泊总的数据集的群体在历史上发生过群体扩张事件。上述结果表明杞麓湖和星云湖银鱼群体遗传多样性水平较低,无显著的群体遗传结构。展开更多
The Chaenocephalus aceratus were sampled in summers between 1979 and 1990. Their otoliths show pattern of daily microincrements as otoliths of similar species--Pseudochaenichthys georgianus and fishes both temperate a...The Chaenocephalus aceratus were sampled in summers between 1979 and 1990. Their otoliths show pattern of daily microincrements as otoliths of similar species--Pseudochaenichthys georgianus and fishes both temperate and tropical waters. Changes of the microincrements growth pattern and otolith shape are described in relation to larval, hatching and metamorphosis stages have similar patterns for Ps. georgianus and Charnpsocephalus gunnari, reflecting similar habitats in their early life. Width of larvae-postlarvae daily increments are： （1.0-1.6）×10-3 SSI, （1.8-2.8）×10-3 SG1 and （1.5-2.4）×10-3 ANI. They were search and chosen automatically from density profiles of otolith tissues. Tissues were prepared by new saving time and materials way--one time up to 40 ones per microscopic glass. Age of fish estimated from microincrements was alike to that inferred from the body length distribution, otoliths mass （age （years） = 140.82 OM （g） ＋ 0.8546） and otolith shape changes--large in length and surface on medial plane. Those parameters create age groups of close neighbours. They have different environments. C. aceratus due to its adaptation to cold water, attain rapidly large body according to a growth equation： Lt= 75.1 ×10-3 （1-e-0.26（t-0.51）. Among large fishes there were only females.展开更多
文摘银鱼是我国重要的经济鱼类,为了解云南杞麓湖和星云湖银鱼群体的遗传多样性与遗传结构,经PCR扩增与测序获得653 bp COI和1205 bp Cytb基因序列。COI基因39条序列共检测到5个单倍型,单倍型多样性、核苷酸多样性、平均核苷酸差异数分别为0.323±0.093、0.00060±0.00020、0.39406。Cytb基因38条序列共检测到6个单倍型,单倍型多样性、核苷酸多样性、平均核苷酸差异数分别为0.413±0.097、0.00102±0.00033、1.22760。COI和Cytb基因的AMOVA分子变异显示群体内的方差组分比率(92.39%,87.03%)大于群体间的方差组分比率(7.61%,12.97%),显示遗传变异主要发生在群体内;且群体间存在中度遗传分化和基因流。COI系统发育树显示杞麓湖和星云湖银鱼序列同新银鱼属未定种、太湖新银鱼和陈氏新银鱼聚为单系支;Cytb树显示两湖银鱼序列同太湖新银鱼和陈氏新银鱼聚为单系支,支持率为100%。单倍型网络图显示两湖银鱼群体的所有单倍型并没有单独聚在一起。此外,COI基因的中性检验和核苷酸错配分布结果显示杞麓湖和两个湖泊总的数据集的群体在历史上发生过群体扩张事件。上述结果表明杞麓湖和星云湖银鱼群体遗传多样性水平较低,无显著的群体遗传结构。
文摘The Chaenocephalus aceratus were sampled in summers between 1979 and 1990. Their otoliths show pattern of daily microincrements as otoliths of similar species--Pseudochaenichthys georgianus and fishes both temperate and tropical waters. Changes of the microincrements growth pattern and otolith shape are described in relation to larval, hatching and metamorphosis stages have similar patterns for Ps. georgianus and Charnpsocephalus gunnari, reflecting similar habitats in their early life. Width of larvae-postlarvae daily increments are： （1.0-1.6）×10-3 SSI, （1.8-2.8）×10-3 SG1 and （1.5-2.4）×10-3 ANI. They were search and chosen automatically from density profiles of otolith tissues. Tissues were prepared by new saving time and materials way--one time up to 40 ones per microscopic glass. Age of fish estimated from microincrements was alike to that inferred from the body length distribution, otoliths mass （age （years） = 140.82 OM （g） ＋ 0.8546） and otolith shape changes--large in length and surface on medial plane. Those parameters create age groups of close neighbours. They have different environments. C. aceratus due to its adaptation to cold water, attain rapidly large body according to a growth equation： Lt= 75.1 ×10-3 （1-e-0.26（t-0.51）. Among large fishes there were only females.
