选取幼虫或蛹的脑神经节,通过低渗、固定处理,然后镜检分析,对采自桂林市郊的4种蚂蚁,即粗纹举腹蚁C rem a tog aster artif ex M eyr、伊大头蚁P heid ole yeensis Fore l、印度大头蚁P heid ole ind ica M ayr、平和弓背蚁C amp onotu...选取幼虫或蛹的脑神经节,通过低渗、固定处理,然后镜检分析,对采自桂林市郊的4种蚂蚁,即粗纹举腹蚁C rem a tog aster artif ex M eyr、伊大头蚁P heid ole yeensis Fore l、印度大头蚁P heid ole ind ica M ayr、平和弓背蚁C amp onotus m itis(F.Sm ith)进行了核型分析.结果表明:粗纹举腹蚁2n=34、伊大头蚁2n=18、印度大头蚁2n=18、平和弓背蚁2n=28;除伊大头蚁的第1条染色体及印度大头蚁的第12条染色体分组为sm型外,其余染色体及另2种的所有染色体分组均为m型.展开更多
In the case of recently established populations of Solenopsis invicta in Taiwan,analysis of genetic variation may provide various dimensions regarding the historical demographic events of this invasive species,which r...In the case of recently established populations of Solenopsis invicta in Taiwan,analysis of genetic variation may provide various dimensions regarding the historical demographic events of this invasive species,which represents a novel opportunity to study the genetic consequences of invasiveness over an ex- tremely short time period.Here we describe genetic structure of two introduced S.invicta populations, Taoyuan and Chiayi,in Taiwan using two classes of markers,nuclear(microsatellites)and mitochondrial (mtDNA)genomes.Pronounced regional differentiation inferred from either AMOVA or Bayesian clustering approach at both genomes suggests that the two populations most likely originate from separate introductions. Furthermore,significant mtDNA but not nuclear differentiation between sympatric social forms suggests two scenarios that interform gene flow is mainly mediated by males,and queens of each form commonly fail to become egg-layers of alternate form.Isolation by distance(IBD)obtained from microsatellites is absent in monogynes,indicating sexuals of this form retain the superior dispersal ability to homogenize the nuclear sig- nature among spatially isolated areas;however,lack of IBD in less vagile polygyne may result from frequent human mediated jump dispersal that erodes the geographical restrictions of genetic exchange.The patterns observed here not only provide insights into how social organization influences the interform gene flow but also reinforce different breeding strategies pursued by two forms in the character of shaping the genetic varia- tion at two levels of genomes.展开更多
＂Display of Tree Canopy＂ is a time-honored custom of Han ethnic people practiced in Nuanquan town, Yu county, Hebci province of north China. This unique and distinctive ancient festivity, has been celebrated for mor...＂Display of Tree Canopy＂ is a time-honored custom of Han ethnic people practiced in Nuanquan town, Yu county, Hebci province of north China. This unique and distinctive ancient festivity, has been celebrated for more than 500 years. By definition, it means spraying liquid iron onto old city walls in order to create an intensive display of sparkles, just like display, of tree canopy.＂Display of Tree Canopy＂ is a time-honored custom of Han ethnic people practiced in Nuanquan town, Yu county, Hebei province of north China. This unique and distinctive ancient festivity has been celebrated for more than 800 years. By definition, it means spraying liquid iron onto old city walls in order to create an intensive display of sparkles, just like display of tree canopy. This festivity presents visual effects as spectacular as display of fireworks.展开更多
文摘选取幼虫或蛹的脑神经节,通过低渗、固定处理,然后镜检分析,对采自桂林市郊的4种蚂蚁,即粗纹举腹蚁C rem a tog aster artif ex M eyr、伊大头蚁P heid ole yeensis Fore l、印度大头蚁P heid ole ind ica M ayr、平和弓背蚁C amp onotus m itis(F.Sm ith)进行了核型分析.结果表明:粗纹举腹蚁2n=34、伊大头蚁2n=18、印度大头蚁2n=18、平和弓背蚁2n=28;除伊大头蚁的第1条染色体及印度大头蚁的第12条染色体分组为sm型外,其余染色体及另2种的所有染色体分组均为m型.
文摘In the case of recently established populations of Solenopsis invicta in Taiwan,analysis of genetic variation may provide various dimensions regarding the historical demographic events of this invasive species,which represents a novel opportunity to study the genetic consequences of invasiveness over an ex- tremely short time period.Here we describe genetic structure of two introduced S.invicta populations, Taoyuan and Chiayi,in Taiwan using two classes of markers,nuclear(microsatellites)and mitochondrial (mtDNA)genomes.Pronounced regional differentiation inferred from either AMOVA or Bayesian clustering approach at both genomes suggests that the two populations most likely originate from separate introductions. Furthermore,significant mtDNA but not nuclear differentiation between sympatric social forms suggests two scenarios that interform gene flow is mainly mediated by males,and queens of each form commonly fail to become egg-layers of alternate form.Isolation by distance(IBD)obtained from microsatellites is absent in monogynes,indicating sexuals of this form retain the superior dispersal ability to homogenize the nuclear sig- nature among spatially isolated areas;however,lack of IBD in less vagile polygyne may result from frequent human mediated jump dispersal that erodes the geographical restrictions of genetic exchange.The patterns observed here not only provide insights into how social organization influences the interform gene flow but also reinforce different breeding strategies pursued by two forms in the character of shaping the genetic varia- tion at two levels of genomes.
文摘＂Display of Tree Canopy＂ is a time-honored custom of Han ethnic people practiced in Nuanquan town, Yu county, Hebci province of north China. This unique and distinctive ancient festivity, has been celebrated for more than 500 years. By definition, it means spraying liquid iron onto old city walls in order to create an intensive display of sparkles, just like display, of tree canopy.＂Display of Tree Canopy＂ is a time-honored custom of Han ethnic people practiced in Nuanquan town, Yu county, Hebei province of north China. This unique and distinctive ancient festivity has been celebrated for more than 800 years. By definition, it means spraying liquid iron onto old city walls in order to create an intensive display of sparkles, just like display of tree canopy. This festivity presents visual effects as spectacular as display of fireworks.
