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鸟类的一种

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A novel method that can identify moving status of birds accurately was proposed. The method can search the cross correlation coefficient of two neighboring high- resolution range profiles with advance-retreat method in spectrogram, based on the principal of generating micro-Doppler effects with the frequency-stepped chirp radar and characteristics of birds.

基于线性调频步进体制雷达微多普勒效应的产生原理,在距离一慢时间谱图上,针对鸟类目标特性,通过对精高分辨距离像进行分析,提出了一种利用进退法搜索相邻精高分辨距离像的互相关系数的方法来判别鸟类目标运动状态。

The diagnostic features for the species include deep excavation on the posteroventral margin of the premaxilla, a diastema between the premaxillary and maxillary teeth, a a number of many pits and ridges on the anterolateral surface of the antorbital fossa, the posterolateral process of the parietal being long and sharply posteriorly directed, the column ar -like margin of the pterygoid process of the quadrate, the bifurcated posterior margin of the dentary, a distinctive groove posterior to the anterior carina on the medial surface of the premaxillary tooth crowns, absence of ventrolateral processes on intercentrum of t he atlas, T-shaped centrum of the first caudal in ventral view, transverse process on anterior caudals with rounded , and strongly anteroposteriorly expanded distal end, presence of two fossae separated by an oblique ridge on the lateral side of the anterior chevrons near the articular end, and pubis strongly curved psoteriorly.

这一属种的主要鉴定特征包括:前上颌骨后腹缘有一深凹、前上颌齿和上颌齿之间有一齿缺、眶前窝外表面前部有许多坑窝和脊、顶骨侧后突伸向后方、方骨的翼骨支边缘柱状、靠近前上颌齿齿冠舌面前缘有槽、环椎间椎体外腹突缺失、第一尾椎椎体腹视 T 形、前部尾椎横突远端前后向强烈扩展呈圆形、前部脉弧近端外侧面有两个被一斜脊分离的窝以及耻骨强烈向后弯曲。通过分析千禧中国鸟龙的96个骨骼学特征,发现其中21个特征支持奔龙类与鸟类的亲缘关系最近,9个特征支持奔龙类与伤齿龙类亲缘关系最近,25个特征支持奔龙类、伤齿龙类和鸟类亲缘关系较为接近。

A member of the subphylum Vertebrata, a primary division of the phylum Chordata that includes the fishes, amphibians, reptiles, birds, and mammals, all of which are characterized by a segmented spinal column and a distinct, well-differentiated head.

脊椎动物脊索动物门的一个原始分支,属于脊椎动物分门的一种动物,包括鱼类、两栖动物、爬行动物、鸟类和哺乳动物,其共同特征是都有节段的脊柱和很明显的、分化的头部

A member of the subphylum Vertebrata,a primary division of the phylum Chordata that includes the fishes,amphibians,reptiles,birds,and mammals,all of which are characterized by a segmented spinal column and a distinct,well - differentiate d head.

脊椎动物脊索动物门的一个原始分支,属于脊椎动物分门的一种动物,包括鱼类、两栖动物、爬行动物、鸟类和哺乳动物,其共同特征是都有节段的脊柱和很明显的、分化的头部

A member of the sub phylum Vertebrata,a primary division of the phylum Chordata that includes the fishes,amphibians,reptiles,birds,and mammals,all of which are characterized by a segmented spinal column and a distinct,well - differentiated head.

脊椎动物脊索动物门的一个原始分支,属于脊椎动物分门的一种动物,包括鱼类、两栖动物、爬行动物、鸟类和哺乳动物,其共同特征是都有节段的脊柱和很明显的、分化的头部

Of 163 species represented by 163 305 individuals had been banded, among them 26 157 birds are Carduelis flammea the most species banded., One banded bird C . flammea banded at the Station was recovered in Norway on February 10, 2003. It is the first bird captured by Europe more than 20 years after the initiation of bird banding program in China.

自1998年开展环志以来,截止2005年12月末,在该地区发现鸟类210种,隶属15目36科,环志鸟类163种163 305只,其中,白腰朱顶雀环志26 157只,是高峰鸟类保护环志站环志数量最多的种类。2003年2月10日挪威回收到由高峰鸟类保护环志站环志的一只白腰朱顶雀,成为中国开展鸟类环志20多年来,欧洲国家回收到的第一只中国环志鸟。

Moreover, CoI gene was more conservative and a lower evolutionary rate than Cyt b gene. CoI gene was an effective marker in analysing the phylogenesis of families in Passeriformes. It can be used in identifying the species of Passeriformes, but it was revealed that CoI gene was more suitable to identify the phylogenetic relationship of avian family unit than Cyt b gene, and CoI gene can be a molecular marker to identify avian species. But in species identification, CoI gene was less stable and accurate than Cyt b gene. We suggested youd better employ the other marker if you have the CoI gene only.(2) In the phylogenetic trees of birds from Lanius, L.

比较分析了雀形目6科15种鸟类的细胞色素b全序列和CoI基因部分序列,结果显示细胞色素b和CoI基因序列的变异位点分别为454个和366个、简约信息位点为337个和303个,而且线粒体CoI基因比细胞色素b基因略微保守、进化速率也较低;CoI基因在确定雀形目科级阶元之间的系统发生关系方面是一种有效的分子标记,同时它也能够用于雀形目鸟类的物种鉴定,但在物种鉴别方面不如细胞色素b基因稳定、准确。

Parus varius, a kind of small cavity-nest forest bird with obvious rupture distribution, had eight subspecies all over the word.

杂色山雀Parus varius是一种分布区域狭窄的小型森林洞巢鸟类,为东亚特有鸟类,主要分布在中国、日本和朝鲜半岛,全球现有8个亚种。

Avian influenza, or fowl plague, is a potentially devastating disease, predominantly of chickens and turkey s, although the virus can also affect game birds, ratites, psittacine and passerine birds.

禽流感,也叫真性鸡瘟,是一种潜在的毁灭性的疾病,主要感染鸡和火鸡,同时也可感染鸟类,平胸鸟类,鹦鹉和雀形目鸟类。

Avian influenza, or fowl plague, is a potentially devastating disease, predominantly of chickens and turkeys, although the virus can also affect game birds ( pheasant s, partridge and quail), ratites, psittacine and passerine birds.

禽流感,也叫真性鸡瘟,是一种潜在的毁灭性的疾病,主要感染鸡和火鸡,同时也可感染鸟类,平胸鸟类,鹦鹉和雀形目鸟类。

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