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排序方式: 共有249条查询结果,搜索用时 15 毫秒
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用同工酶谱法发现中华乌塘鳢Bostrichthy sinensis四个群体的遗传变异水平很低,在所检测的30个基因座位中,多态座位比例只有0—10%,平均杂合度仅为0.2—0.5%,物种的平均杂合度为0.33±0.10%。四个群体共享常见的等位基因。虽然其中三个群体拥有特有的等位基因,但其基因频率都未超过5%。四个群体的Nei氏遗传距只有1.68—12.13×10~(-5)。据分析,近交可能是遗传变异水平低和形态特征分化差的主要原因。种苗生产上应注意广泛采集不同地理群体的鱼作亲鱼,以丰富养殖群体的基因库。 相似文献
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激光扫描共聚焦显微镜具有成像清晰、获得三维图像、进行多标记观察等优势。本文扼要介绍了激光扫描共聚焦显微镜的原理和特点,着重阐述了激光扫描共聚焦显微镜在海洋动物配子发生;受精过程中细胞内Ca~(2 )变化、肌动蛋白转移和蛋白激酶变化;胚胎和幼体发育的三维成像等研究领域中的应用。并对LSCM在DNA含量、RNA含量等领域的定量、定性前景进行展望。 相似文献
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根据1992年8月30日-9月4日在日本名古层如开的第九届国际光合作用大会上交流的以藻类为材料的研究论文,综述了分子遗传学方面的研究成果。认为这些成果体现了光合作用研究的最新进展,蕴含有一定的应用前景;表明类分子遗传学不仅是藻类学研究领域的带头学科,而且已经活跃在光合作用等重大生物学问题研究的前沿;反映了藻类分子遗传学向解决生物学重大问题和推动藻类资料开发方向发展的趋势。 相似文献
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The franciscana dolphin, Pontoporia blainvillei, is endemic to the coastal waters of the southwestern Atlantic Ocean and the most endangered dolphin in the area. Four Franciscana Management Areas (FMAs) are currently recognised; however, results of genetic studies suggest the requirement for additional FMAs and highlight the need for more detailed studies in the southern extreme of the species distribution. With this aim, we studied the genetic diversity and population structure of the species analysing an mtDNA control region fragment (434?bp) in 44 individuals collected in four sampling sites located in Southern Buenos Aires. Haplotype diversity (H?=?0.75?±?0.05) was mostly higher than the observed in endangered or near threatened odontocetes. Population structure analyses suggest that three different genetic populations should be recognised within FMA IV: Northern, Eastern and Southern Buenos Aires. Altogether, these results should be taken into account in future conservation plans for the species. 相似文献
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Johannes Dambach Michael J. Raupach Florian Leese Julia Schwarzer Jan O. Engler 《Marine Ecology》2016,37(6):1336-1344
The coherency among larval stages of marine taxa, ocean currents and population connectivity is still subject to discussion. A common view is that organisms with pelagic larval stages have higher dispersal abilities and therefore show a relatively homogeneous population genetic structure. Contrary to this, local genetic differentiation is assumed for many benthic direct developers. Specific larval or adult migratory behavior and hydrographic effects may significantly influence distribution patterns, rather than passive drifting abilities alone. The Southern Ocean is an ideal environment to test for the effects of ocean currents on population connectivity as it is characterized by several well‐defined and strong isolating current systems. In this study we studied the genetic structure of the decapod deep‐sea shrimp Nematocarcinus lanceopes, which has planktotrophic larval stages. We analysed 194 individuals from different sample localities around the Antarctic continent using nine microsatellite markers. Consistent with a previous study based on mitochondrial DNA markers, primarily weak genetic patterns among N. lanceopes populations around the continent were found. Using ocean resistance modeling approaches we were able to show that subtle genetic differences among populations are more likely explained by ocean currents rather than by geographic distance for the Atlantic Sector of the Southern Ocean. 相似文献
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Jim Glassman 《The Professional geographer》2016,68(2):322-329
Discussions of East Asian developmental states and Asian values discourse have been deformed by national-territorial frameworks that limit scholars' ability to highlight transnational phenomena. Such limits can be overcome by adopting a “Pacificist” perspective, one that highlights the transnational collaborative efforts of Pacific ruling class members, from both Asia and the United States. Such a Pacificist approach has the virtue of highlighting phenomena of transnational class formation that help account for the emergence of both developmental states in East Asia and Asian values discourse, and it also suggested the importance of attending to other kinds of emerging actors in Asian development politics, such as labor and democracy movements. 相似文献