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Search Results: 1 - 10 of 58906 matches for " Canchao Yang "
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Coevolution in Action: Disruptive Selection on Egg Colour in an Avian Brood Parasite and Its Host
Canchao Yang,Wei Liang,Yan Cai,Suhua Shi,Fugo Takasu,Anders P. M?ller,Anton Antonov,Frode Foss?y,Arne Moksnes,Eivin R?skaft,B?rd G. Stokke
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0010816
Abstract: Trait polymorphism can evolve as a consequence of frequency-dependent selection. Coevolutionary interactions between hosts and parasites may lead to selection on both to evolve extreme phenotypes deviating from the norm, through disruptive selection.
Are Cuckoos Maximizing Egg Mimicry by Selecting Host Individuals with Better Matching Egg Phenotypes?
Anton Antonov, B?rd G. Stokke, Frode Foss?y, Peter S. Ranke, Wei Liang, Canchao Yang, Arne Moksnes, Jacqui Shykoff, Eivin R?skaft
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0031704
Abstract: Background Avian brood parasites and their hosts are involved in complex offence-defense coevolutionary arms races. The most common pair of reciprocal adaptations in these systems is egg discrimination by hosts and egg mimicry by parasites. As mimicry improves, more advanced host adaptations evolve such as decreased intra- and increased interclutch variation in egg appearance to facilitate detection of parasitic eggs. As interclutch variation increases, parasites able to choose hosts matching best their own egg phenotype should be selected, but this requires that parasites know their own egg phenotype and select host nests correspondingly. Methodology/Principal Findings We compared egg mimicry of common cuckoo Cuculus canorus eggs in naturally parasitized marsh warbler Acrocephalus palustris nests and their nearest unparasitized conspecific neighbors having similar laying dates and nest-site characteristics. Modeling of avian vision and image analyses revealed no evidence that cuckoos parasitize nests where their eggs better match the host eggs. Cuckoo eggs were as good mimics, in terms of background and spot color, background luminance, spotting pattern and egg size, of host eggs in the nests actually exploited as those in the neighboring unparasitized nests. Conclusions/Significance We reviewed the evidence for brood parasites selecting better-matching host egg phenotypes from several relevant studies and argue that such selection probably cannot exist in host-parasite systems where host interclutch variation is continuous and overall low or moderate. To date there is also no evidence that parasites prefer certain egg phenotypes in systems where it should be most advantageous, i.e., when both hosts and parasites lay polymorphic eggs. Hence, the existence of an ability to select host nests to maximize mimicry by brood parasites appears unlikely, but this possibility should be further explored in cuckoo-host systems where the host has evolved discrete egg phenotypes.
Waterbirds diversity, seasonal dynamics, and interspecific correlation in the wetlands of Beili and Houshui Bays, Hainan

Canchao Yang,Yan Cai,Wei Liang,Guogang Zhang,Haitao Shi,

生物多样性 , 2009,
Abstract: 2004年11月至2005年11月, 采用逐月定点统计的方法, 对海南北黎湾和后水湾两个湿地黑脸琵鹭(Platalea minor)的越冬种群和水鸟的季节动态进行了调查。共记录到水鸟50种, 隶属于5目10科, 首次发现海南新记录种半蹼鹬(Limnodromus semipalmatus)。两地水鸟种类和数量的最高峰均发生在11月, 最低谷在次年6月, 与湿地水鸟的全年变化相关。黑脸琵鹭的越冬种群最早到达海南为9月, 离开时间为次年4月, 数量最高峰在北黎湾为12月(75只), 在后水湾为1月和2月(9只)。北黎湾水鸟的Shannon-Wiener指数、Pielou均匀度指数和最大多样性值均大于后水湾, 湿地面积大小及其生境的多样性是两地水鸟丰富度差异的主要原因, 而人为干扰强度可能是影响黑脸琵鹭对两地越冬地利用的重要因素。研究表明, 北黎湾和后水湾是许多水鸟, 尤其是黑脸琵鹭在海南的重要越冬地, 需进一步加强监测和保护。
Fundamental Research on the Administrative Discretion Standard  [PDF]
Yang Yang
Beijing Law Review (BLR) , 2012, DOI: 10.4236/blr.2012.33017
Abstract: This paper describes a system for the analysis of the administrative discretion standard. Now, it is a new phenomenon in the practice of administrative law enforcement. We shall first briefly introduce fuzzy sets and related concepts of the administrative discretion standard, and then, we try to introduce the intrinsic value of its legitimacy. At the same time, the research standard of interpretation, procedure and “requirements-effect” are discussed based on the analysis through its content. From the above discussion, the conclusion can be reached that it is the power’s structure to deal with individuals and societies on the micro side.
Study of Improving the Management System of Temporary Resident Population  [PDF]
Yang Yang
Current Urban Studies (CUS) , 2013, DOI: 10.4236/cus.2013.14019
Abstract: Due to the function for management is abnormally amplified, its service’s function is not well reflected when it is carried out for the Management System for Temporary Resident Population. So it will face enormous pressure and there are many problems for the management system for the temporary residential permit and it need to further be strict and improved. Our government should change from the prevention and control management for the past into the service management which emphasizes on both management and service according to the concept of people-oriented on the basis of retaining and improving the tem-porary residence registration in current. Firstly, they should further intensify the reform of the household registration system to introduce the concept of citizen treatment and continue to reinforce the value of temporary residential permits. Secondly, the departments will perform their functions and adhere to com-prehensively management. Thirdly, they should establish the population management information net-work to share the resources.
Procedure Standard and Administrative Investigation
—Realization of the Self-Discipline Principle

Yang Yang
Open Journal of Political Science (OJPS) , 2013, DOI: 10.4236/ojps.2013.34016

How to effectively protect the interests and rights of individuals and how to even realize a higher-level goal, individual justice and creative property are disturbing problems in administrative investigation. However, the complexity of the problem is increased because it includes arbitrary investigation and compulsory investigation. The specialness of the problem can be discovered through the clarity of administrative investigations on the attribution of concrete administrative acts. There is another effective method, namely the procedure standard reflecting the self-discipline principle except the mainstream method of right-control (i.e. judicial review). It is a combination of self-discipline with right-control, and may be one of the methods keeping pace with judicial review to realize the above-mentioned goal.

Analysis of Solution to Environmental Law Education for College Students  [PDF]
Yang Yang
Beijing Law Review (BLR) , 2013, DOI: 10.4236/blr.2013.43013

The environmental crisis is one of three major crises to human’s development. But there are a series of issues in present for environmental law education of college students, such as this course, which are low offered and lack of sustainability, colleges and universities do not pay enough attention to it. They are weak in the relevant basic theory and they are lack of vocational training and so on. In order to solve the above problems, we can try to do the “two combinations”. The first is the combination vocational training and basic knowledge and the second is combining vocational training in the classroom with outside of the classroom in environmental law.

Study of the Development of Youth Culture under the Background of Advanced Culture  [PDF]
Yang Yang
Sociology Mind (SM) , 2014, DOI: 10.4236/sm.2014.41008

It refers to the sum total of value system, behavioral norms and social relationships accepted by young generations for youth culture which has the characteristic of hierarchy, variability and rebellion. It has also had positive and negative functions. It is the mutual influence and mutual promoting relationship between the youth culture and advanced culture. Comrade Hu Jintao puts forward three wishes to the majority of young people, but also gives the youth culture three new elements, which are diligent in learning, good at creating and making contribution. In the new period, the youth culture will further be boosted when we are developing advanced culture.

Study of the Role of NGO in Strengthening the Food Safety and Construction of the Relevant Law  [PDF]
Yang Yang
Open Journal of Political Science (OJPS) , 2014, DOI: 10.4236/ojps.2014.43015
Food safety, which is a key part of livelihood projects, is not only closely related to the thousands of households table, but enormously affecting the whole country. The government departments as the manager of the public interests have been committed to strengthen the construction of food safety, but its results are always unremarkable. In order to prevent “the government failure” in the process of food supervision, the food NGO is now entering the people’s view. It has a comparative advantage in specialization, independence and efficiency, however, as an emerging force, it is also plagued by problems such as small number, weak power, lack of necessary support in law and so on. Therefore, the food NGO might be worth a great deal; it is essential for the system construction especially the construction of relevant Law apart from continuous development and ceaseless accumulation.
Study of the Standard Insurance Provisions’ Interpretation  [PDF]
Yang Yang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.24021
Abstract: The new insurance law has been implemented for a long time, but it is still disputed frequently for the application of standard insurance clause. We can see this from many cases, e.g. the Sued People’s Insurance Company of China LLC, Jinyun Branch office Insurance contract Dispute Case by Li Shangzhi. This paper is trying to take the standard insurance clause as the beginning point to briefly analyze the reason for the terms’ understanding differences and to study their unfavorable interpretation principle through comparing the provisions’ samples in the old and new insurance law, which can be looked forward to providing some ideas for their corresponding practice.
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