Phylogeographic study on the chub mackerel (Scomber japonicus) in the Northwestern Pacific indicates the late Pleistocene population isolation          下载免费PDF全文

Shuai Yan  Gaetano Catanese  Christopher L. Brown  Ming Wang  Chaopin Yang  Tingbao Yang 《Marine Ecology》2015,36(3):753-765

In the present study, the population genetic structure and historical demography of the chub mackerel, Scomber japonicus, in the Northwestern Pacific were examined based on the full‐length sequences of the mitochondrial control region and cytochrome b gene. A total of 320 individuals was sampled from 11 localities along the coast of China and Japan from August 2011 to May 2013. Two main clades representing Chinese and Japanese populations, respectively, were detected, suggesting population isolation of S. japonicus during the late Pleistocene era. The Chinese clade was further divided into two small clades and the distribution of haplotypes were not related to sampling locality, which may be a signature of secondary contact following past division. Analyses of molecular variance and pairwise F_ST revealed significant genetic differentiation between the Chinese and Japanese populations, but a lack of genetic structure for the populations along the coast of China. Both neutrality tests and mismatch distribution analysis suggested that the populations along the coast of China experienced population expansion during the late Pleistocene. Historical events, biological characteristics and other extrinsic forces such as ocean currents may all be associated with the current phylogeographic pattern of S. japonicus in the Northwestern Pacific.  相似文献   

基于AMSR-E数据的多年冰密集度反演算法研究   总被引：2，自引：1，他引：1  

郝光华  苏洁 《海洋学报(英文版)》2015,34(9):102-109

In recent years, the rapid decline of Arctic sea ice area(SIA) and sea ice extent(SIE), especially for the multiyear(MY) ice, has led to significant effect on climate change. The accurate retrieval of MY ice concentration retrieval is very important and challenging to understand the ongoing changes. Three MY ice concentration retrieval algorithms were systematically evaluated. A similar total ice concentration was yielded by these algorithms, while the retrieved MY sea ice concentrations differs from each other. The MY SIA derived from NASA TEAM algorithm is relatively stable. Other two algorithms created seasonal fluctuations of MY SIA, particularly in autumn and winter. In this paper, we proposed an ice concentration retrieval algorithm, which developed the NASA TEAM algorithm by adding to use AMSR-E 6.9 GHz brightness temperature data and sea ice concentration using 89.0GHz data. Comparison with the reference MY SIA from reference MY ice, indicates that the mean difference and root mean square(rms) difference of MY SIA derived from the algorithm of this study are 0.65×106 km2 and0.69×106 km2 during January to March, –0.06×106 km2 and 0.14×106 km2 during September to December respectively. Comparison with MY SIE obtained from weekly ice age data provided by University of Colorado show that, the mean difference and rms difference are 0.69×106 km2 and 0.84×106 km2, respectively. The developed algorithm proposed in this study has smaller difference compared with the reference MY ice and MY SIE from ice age data than the Wang's, Lomax' and NASA TEAM algorithms.  相似文献   

地热系统深部热能聚敛理论及勘查实践     

王贵玲  蔺文静  刘峰  甘浩男  王思琪  岳高凡  龙西亭  刘彦广 《地质学报》2023,97(3):639-660

深部热能聚敛及富集过程研究是地热资源探测评价的重要基础。地热壳构热控理论是以地球动力学理论为基础,以构造控热作用研究为主线,通过大地构造学、构造地质学、地热地质学等学科理论和方法,研究深部热能聚敛过程及热异常分布规律,分析各种构造要素间的相互作用及控热机制,探讨地热资源靶区预测方法,从而指导地热勘查的科学。本文系统论述了地热壳构热控理论的内涵与外延,提出了我国不同类型地热资源“同源共生-壳幔生热-构造聚热”的客观自然规律,分析了我国陆区壳幔尺度热流配分格局与不同地质背景条件下影响浅地表温度场的主要控热构造,并以渤海湾盆地、青藏高原、东南沿海等我国主要地热系统为研究对象,以壳构热控理论为指导,以勘查区找热为出发点,以控热作用内生因素(壳幔生热)和外生因素(构造聚热)为切入点,通过研究影响壳幔生热、壳内传热、勘查靶区聚热这一地球物理过程,确定了不同构造背景下地热系统的主要控热构造。从传统的经验式找热到建立构造控热预测标志,再到水热型地热资源-干热型地热资源共生富集认知,理论认识的创新发展,将引领和支撑我国地热资源不断实现高效勘探和开发利用。  相似文献   

依兰盆地达连河油页岩成矿控制因素研究          下载免费PDF全文

刘志逊  代鸿章  张鑫刚  马腾  葛佐  贾音传 《地质科学》2014,49(4):1232-1246

达连河油页岩含矿区位于黑龙江省依兰地区,该区是一个半地堑式断陷盆地。油页岩形成受到多重因素制约,构造上在靠近断裂F₂的煤和油页岩厚度较厚,随着湖盆沉积范围的扩大,表现了一种从湖平面逐渐向岸上上超的过程;高水位体系域浅湖-半深湖相和水进体系域湖泊-沼泽相形成不同成因类型油页岩;孢粉分析结果可知油页岩形成的气候总体呈现出气候温和、 温度下降的发展趋势;而气候的波动影响了古生物的发育,降低了有机质生产能力,进而造成油页岩含油率低。  相似文献   

Dynamic Model Re-construction and Corresponding Abnormal Characteristics Anatomy of Subtropical High based on Actual DataTime SeriesSamples     

Zhang Ren  Hong Mei  Liu Kefeng  Zhu Weijun 《地球科学进展》2014,29(11):1250-1261

Aiming at the abnormal activity of West Pacific Subtropical High(WPSH) inducing the serious flood disaster in 1998, and considering the complex seasonal activity of WPSH in summer, based on the actual geopotential height field time series observational data in 1998, a non-linear dynamic model of WPSH was reconstructed by using the idea of dynamic system retrieval and genetic algorithms. Combined with the synchronous actual weather process, the corresponding dynamic characteristics and variation mechanism of WPSH, such as the equilibrium state destabilization and bifurcation of the WPSH system, were analyzed and discussed. The research showed that due to the advantages of global optimization and parallel calculation of GA, a nonlinear dynamic model could be reasonably and quickly reconstructed, and the reconstructed nonlinear dynamic model of WPSH derived from the actual abnormal case data could be used for describing objectively and explaining reasonably the basic characteristics and the abnormal activity process of WPSH. The dynamic discussion showed that the configuration and diversification of WPSH system equilibriums, such as bifurcation, catastrophe had a good matching with the actual medium short period abnormal activity of WPSH, such as northward jumping and southward droping, as well as double-ridge line pattern. The modality of WPSH geopotential height field induced by multi-equilibriums destabilization was more complex than that of by single-equilibriums bifurcation, and their exhibition patterns were more different. With the forcing parameters increaseing, closing with and exceeding critical value, the WPSH system equilibrium state destabilization or bifurcation would occur. Especially, when the equilibrium state jump/drop from low/high to the high/low value, corresponding WPSH system behaved as a leap northward /fall southward, moreover, when the stable equilibriums state from 1 to 2, corresponds with the pattern of “double-ridges” phenomenon of WPSH, contrariwise, “double-ridges” phenomenon would disappear. A meaningful technique route was provided to the mechanism research and dynamic characteristic discussion for the complex weather system of hardly modeling such as WPSH.  相似文献   

四川康定四家寨金矿地质特征及找矿标志     

和玉红 《云南地质》2014,33(3):384-386

四家寨金矿是康定杂岩内典型的石英脉-蚀变岩型金矿床,金矿（化）石英脉呈似层状,透镜状充填于构造破碎带中,硅化、黄铁矿化与金矿关系密切,脆-韧性剪切带是本区重要的找矿标志.  相似文献   

云南兰坪科登涧构造热液型铜多金属矿     

刘仕军  周癸武 《云南地质》2014,(1):51-54

铜矿赋存于上三叠统小定西组中段变质火山岩中,圈出两条铜矿体,分别受F1和F2压扭性断层破碎带控制,似层状产出.金属硫化物大多呈大斑块状集合体密集分布,属与脆韧性断裂有关的构造热液型铜多金属矿床.  相似文献   

个旧东区东西向断裂控岩控矿特征   总被引：1，自引：0，他引：1  

韩冬梅  谭敏 《云南地质》2014,(1):71-75

对东西向构造控岩控矿特征进行全面总结分析,讨论了东西向断裂深部找矿的意义,指出深部找矿方向.  相似文献   

印尼苏拉威西超大型红土型镍矿找矿标志     

张俊熙  杨玉华 《云南地质》2014,(1):28-31,35

超大型红土型镍矿主要控矿因素,板块边界三联点构造控制的白垩纪、三叠纪、二叠纪蛇绿岩底部镁质超基性岩,基岩MgO/Fe0比值14～18,通过风化作用后,形成结构分带较好的风化壳,风化壳对数Mgo/全铁比值0.4～1,地貌20～400米标高、5～ 20度坡度角,中、低山面型地貌.  相似文献   

A general equation for performance analysis of multi-component propulsor with propeller     

《Applied Ocean Research》2017

An integral panel method (IPM) that treats the different components of multi-component propulsors as a whole is presented for efficient propulsor performance analysis. The IPM requires consider only one blade of the propeller in the performance analysis, which significantly reduces the number of computation grid. The control equations of the IPM are derived in detail for podded propulsors, contra-rotating propellers and hybrid contra-rotating shaft pod propulsors, and based on these derivations, a general control equation for multi-component propulsors with propeller is derived. Comparison between numerical results and experimental data show that the IPM provides good accuracy for the performance analysis of multi-component propulsors with propeller. In addition, the error sources of IPM are discussed, and the reasonableness of these errors is evaluated.  相似文献