The discontinuous component of the genetic variation pattern of a species also contains the differences among subpopulations resulting from accidents of sampling genetic drift and others . 物種遺傳變異型不連續(xù)的成分也包含抽樣遺傳播遷和其他事故引起的亞種群之間的差別。
The genetic structure of aegiceras corniculation subpopulations in different tides 亞種群的遺傳結(jié)構(gòu)
Conservationists have now hit on a similar idea : a population of endangered animals will have a better chance of survival if it is divided into interconnected groups 自然資源保護(hù)者最近偶然得出一個(gè)相似的想法:將瀕危物種的種群劃入幾個(gè)互相聯(lián)系的亞種群將增加它們的存活率。
And , in the long term , it matters little if one or two groups do disappear , because immigrants from better - faring patches will eventually re - establish the species ' old haunts 而且,從長期看來,就算物種的一兩個(gè)亞種群消失了也無關(guān)緊要,因?yàn)槟切﹣碜允澄锍渑嬷?斑塊" [ 1 ]的“新移民”最終將重建物種原有的生境。
The results showed that the higher genetic diversity and the genetic differentiation existed in the population of reaumuria soongorica , which was composed of 7 subpopulations and 136 individuals , generated by 15 primers . 71 loci had been detected and 69 were polymorphic 15條隨機(jī)引物對紅砂7個(gè)亞種群的136個(gè)個(gè)體進(jìn)行擴(kuò)增,共檢測71個(gè)位點(diǎn),其中多態(tài)位點(diǎn)69個(gè)。
The populations of cathaica cavimargo are distributed in a number of heterogeneous habitats , from the hillside to the valley . these populations ( more precisely , subpopulations ) have pronounced variations in population density , shell biometric characters and shell colouration 從山腰到山谷, cathaicacavimargo在許多異質(zhì)環(huán)境中均有分布,這些這些種群(或更準(zhǔn)確地講亞種群)的密度、貝殼大小和貝殼顏色之間存在一定程度的差異。
Furthermore , the study indicated that the genetic diversity of the natural population of reawnuria soongorica increased with the decreasing of the content of organic matter , water , total n and total p in soil , which had some relation with more potentiality of the genetic and variation of reawnuria soongorica in its long - term evolution to adapt worse environment 經(jīng)分析表明,無葉假木賊種群與角果藜種群的shannon多樣性指數(shù)分別為0 . 1403和0 . 1615 ,基因分化系數(shù)( g _ ( st ) )為0 . 1469和0 . 1659 ,揭示了兩物種種群遺傳變異多存在于亞種群內(nèi),亞種群間的遺傳分化則不明顯。
The results showed that the mean proportion of polymorphic loci ( ppb ) of anabasis aphylla , which comprised 3 subpopulations ( 58 individuals sampled ) , generated by 16 primers was 94 . 56 % , the value of ppb of ceratocarpus arenarius , which had 4 subpopulations ( 80 individuals sampled ) , using 16 primers was 98 . 00 % . the paper had proved that the higher genetic diversity and the genetic differentiation existed in the populations of boih anabasis aphylla and ceratocarpus arenarius , while the latter had much more genetic diversity than the former . moreover , the study discussed the shannon information index and nei ' s gene diversity index of the two species natural populations , which indicated that there were more genetic variations within the subpopu 另外,通過rapd資料的聚類分析及相關(guān)性分析研究,發(fā)現(xiàn)無葉假木賊和角果藜自然種群的遺傳結(jié)構(gòu)與綠洲沙漠過渡帶的微生境生態(tài)因子(主要是土壤因子)相關(guān),其中無葉假木賊亞種群遺傳多樣性水平不僅與土壤含水量( w ) 、鉀鈉離子濃度( k + na )和氯離子濃度( cl )呈顯著的正相關(guān)( p 0 . 05 ) ,還與土壤中有機(jī)質(zhì)( som ) 、全氮( nt )和全磷( pt )含量呈顯著的負(fù)相關(guān);同時(shí),角果藜種群的遺傳多樣性水平與土壤中有機(jī)質(zhì)( som )和全氮( nt )含量呈顯著的正相關(guān),而與co _ 3 ~ ( 2 - )濃度呈顯著的負(fù)相關(guān);除此之外,其它土壤生態(tài)因子與兩物種遺傳多樣性水平的相關(guān)性均不顯著(卜0 . 05 ) 。
The gene flow among the subpopulations of reawnuria soongorica ( mn = 1 . 1028 , nm > 1 ) was much less than that of the common anemophytes ( atm = 5 . 24 ) , so the species was in the critical state of genetic differentiation to some extent the results of amova showed that there were 61 . 58 % of the total genetic variations existing among the subpopulations , and 38 . 02 % within them 紅砂亞種群間的基因流nm = 1 . 1028 , nm 1但低于一般風(fēng)媒傳粉植物( nm = 5 . 24 )的基因流水平,處于分化的臨界狀態(tài)。 amova分析說明紅砂種群變異的61 . 58存在于亞種群內(nèi),而亞種群間的變異占總變異的38 . 02 。