共查询到17条相似文献,搜索用时 78 毫秒
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Orthotrichum tortifolium Lewinsky,作为一个不丹特有种, 最近在中国首次发现。2021年4月,我们在四川贡嘎山自然保护区采集到2份标本。它们的形态与Orthotrichum tortifolium的模式基本一致。该种的主要鉴定特征是扭曲或卷缩的叶片和具很高基膜的内蒴齿。而且,这2个特征在木灵藓属(Orthotrichum)中都较罕见。我们在此提供了详细的形态描述和照片,并讨论了它与相似种的主要区别。 相似文献
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华模蛛科——采自中国的蜘蛛目一新科(蛛形纲,蜘蛛目) 总被引:1,自引:0,他引:1
记述了采自我国云南西双版纳雨林的1新科,华模蛛科Sinopimoidae fam.nov.,1新属,华模蛛属Sinopimoa gen.nov.,1新种,双色华模蛛Sinopimoa bicolor sp.nov..模式标本保存在中国科学院动物研究所. 相似文献
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报道迄今仙女蝎蛉科的最古老化石(meropeids)在中国陕西发现.经研究确定1新属1新种:Sinothuama ladinica gen.et sp.,归入仙女蝎蛉科Meropeidae Handlisch,1906.此次这类化石的发现,其意义在于:首次发现迄今世界上仙女蝎蛉科的最古老化石(meropeids),从而打破了俄国学者发现最古老仙女蝎蛉化石在晚三叠世所保持30余年的纪录;并根据从晚三叠世至新生代中仙女蝎蛉化石的不同种类所反映出来的脉序变化特征,推论仙女蝎蛉早期分异于在三叠纪,继承和发展于侏罗纪.化石采自中国陕西铜川地区中三叠统铜川组(Tr2t),时代相当于欧洲标准时代的拉丁尼期(Ladinian stage). 相似文献
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小黄斑蜂属Anthidiellum Cockerell,1904为中国首次报道的属.记述中国切叶蜂科小黄斑蜂属AnthidiellumCockerell,小黄斑蜂亚属Anthidiellum s.str.Cockerell的种类,并编制了3新种的检索表,3新种是:大盾小黄斑蜂Anthidiellum(s.str.)scutellatum sp.nov.,北方小黄斑蜂Anthidiellum(s.str.)borealis sp.nov.,新疆小黄斑蜂An-thidiellum(s.str)xinjiangensis sp.nov..模式标本均保存于中国科学院动物研究所. 相似文献
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Genetic relationships between 27 Orthotrichum species of the subgenera Orthotrichum and Pulchella were reconstructed using the internal transcribed spacer regions 1 and 2,the chloroplast trnH-psbA regi... 相似文献
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蓝果杜鹃( Rhododendron cyanocarpum)为大理苍山特有的濒危植物,有粉色和白色两种花冠类型。为了探讨该物种花色多态性的意义,本研究调查了粉色花和白色花植株在已知的各居群的分布频率、花冠的反射光谱及其它的花部特征、有效传粉者及其访花频率与结实情况。结果表明:粉色花植株在所有调查的居群中占优势(77%~100%)。粉色花的花冠反射光谱在430 nm和650 nm有两个峰,而白色花只在430 nm有一个反射峰。同时,花特征如:花柱与柱头颜色、花冠长度、花萼长度、花梗长度以及雌雄蕊最短距离,两种花冠存在显著差异。另外,尽管熊蜂作为这两种花冠的主要传粉者,但粉红花的访花频率以及自然条件下的结实情况显著高于白色花。本研究结果推测粉红色花可能受到了稳定性选择的作用。 相似文献
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Genetic Variation in Chinese Pine (Pinus tabulaeformis), a Woody Species Endemic to China 总被引:1,自引:0,他引:1
Random amplified polymorphic DNA markers were used to investigate genetic variation of the Chinese pine (Pinus tabulaeformis Carr.), a species endemic to China and the most widely distributed pine species in North China. The results revealed that P. tabulaeformis populations had a relatively high level of genetic diversity (H t = 0.3268), distributed mainly within (79.2%) rather than among (20.8%) populations. The populations of Lingkong Mountain and Wuling Mountain had a higher level of diversity (0.2687) than the other four populations (0.2537). No statistically significant relationships were found between genetic diversity and climatic factors by correlation analysis and between genetic distance and geographic distance by the Mantel test. These results suggest that the partitioning of genetic diversity in each population might have been influenced not only by water and temperature conditions but also by other factors such as human activities and the Holocene postglacial history of these populations. 相似文献
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Mitochondrial DNA Genetic Diversity of Black Muntjac (Muntiacus crinifrons), An Endangered Species Endemic to China 总被引:4,自引:0,他引:4
Genetic diversities based on the mtDNA control region were measured for both a wild population (n = 26) and a captive population (n = 18) of the black muntjac. In total, nine haplotypes were obtained from 44 samples. The wild population exhibited a low
nucleotide diversity (π = 0.00562), which suggests that the black muntjac had a small effective population size historically.
In contrast to its low nucleotide diversity, haplotype diversity (h = 0.862) of the wild population was relatively high. Haplotype distribution among local samples shows a distinct difference.
As anticipated because of the paucity of available founders, nucleotide diversity (π = 0.00214) of the captive population
was very low. Additionally, a high degree of haplotype identity and an obvious haplotype frequency bias was revealed in the
captive population, which implies that the current breeding program should be readjusted to balance distributions of haplotypes,
and some new founders should be introduced to the captive population to alleviate potential inbreeding depression. 相似文献
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假桦多孔菌(Polyporus pseudobetulinus)采于吉林省长白山自然保护区,为中国多孔菌属一新记录种。文中根据所采集的材料对其进行了详细描述和绘图,并对相似种进行了讨论。 相似文献