Avian color vision and coloration : multidisciplinary evolutionary biology

A fundamental issue in biology is explaining the diversity of coloration found in nature. Birds provide some of the best-studied examples of the evolution and causes of color variation and some of the most arresting color displays in the natural world. They possess perhaps the most richly endowed visual system of any vertebrate, including UV-A sensitivity and tetrachromatic color vision over the 300-700-nm waveband. Birds provide model systems for the multidisciplinary study of animal coloration and color vision. Recent advances in understanding avian coloration and color vision are due to recognition that birds see colors in a different way than humans do and to the ready availability of small spectrometers. We summarize the state of the current field, recent trends, and likely future directions.

Ultraviolet colour perception in European starlings and Japanese quail

Whereas humans have three types of cone photoreceptor, birds have four types of single cones and, unlike humans, are sensitive to ultraviolet light (UV, 320-400 run). Most birds are thought to have either a violet-sensitive single cone that has some sensitivity to UV wavelengths (for example, many non-passerine species) or a single cone that has maximum sensitivity to UV (for example, oscine passerine. species). UV sensitivity is possible because, unlike humans, avian ocular media do not absorb UV light before it reaches the retina. The different single cone types and their sensitivity to UV light give birds the potential to discriminate reflectance spectra that look identical to humans. It is clear that birds use UV signals for a number of visual tasks, but there are few studies that directly demonstrate a role for UV in the detection of chromaticity differences (i.e. colour vision) as opposed to achromatic brightness. If the output of the violet/UV cone is used in achromatic visual tasks, objects reflecting more UV will appear brighter to the bird. 11, however, the output is used in a chromatic mechanism, birds will be able to discriminate spectral stimuli according to the amount of reflected light in the UV part of the spectrum relative to longer wavelengths. We have developed a UV 'colour blindness' test, which we have given to a passerine (European starling) and a non-passerine (Japanese quail) species. Both species learnt to discriminate between a longwave control of orange vs red stimuli and UV vs 'non-UV' stimuli, which were designed to be impossible to differentiate by achromatic mechanisms. We therefore conclude that the output of the violet/UV cone is involved in a chromatic colour vision system in these two species.

Animal visual systems and the evolution of color patterns; sensory processing illuminates signal evolution

Animal color pattern phenotypes evolve rapidly. What influences their evolution? Because color patterns are used in communication, selection for signal efficacy, relative to the intended receiver's visual system, may explain and predict the direction of evolution. We investigated this in bowerbirds, whose color patterns consist of plumage, bower structure, and ornaments and whose visual displays are presented under predictable visual conditions. We used data on avian vision, environmental conditions, color pattern properties, and an estimate of the bowerbird phylogeny to test hypotheses about evolutionary effects of visual processing. Different components of the color pattern evolve differently. Plumage sexual dimorphism increased and then decreased, while overall (plumage plus bower) visual contrast increased. The use of bowers allows relative crypsis of the bird but increased efficacy of the signal as a whole. Ornaments do not elaborate existing plumage features but instead are innovations (new color schemes) that increase signal efficacy. Isolation between species could be facilitated by plumage but not ornaments, because we observed character displacement only in plumage. Bowerbird color pattern evolution is at least partially predictable from the function of the visual system and from knowledge of different functions of different components of the color patterns. This provides clues to how more constrained visual signaling systems may evolve.

Japanese investment on the Gold Coast : the interface of globalization and locality

This study explored the interface between the forces of globalization and a given place, at a given time, the Gold Coast during the 1980s. The global economic boom of the 1980s was one in which the role of Japan was particularly important. In less than half a decade capital flows from Japan surged to make it the world's largest investor. Locations in the Pacific Basin were favoured destinations for Japanese investment, one of the most significant was the Gold Coast. Japanese capital and tourism helped transform its urban area from a national resort to an international tourist destination and resort centre, The surge of capital arriving to the Gold Coast was a function of economic conditions in Japan, as was its steep reduction after November 1989, Thus the Gold Coast became integrated into global capital flows and so dependent on decisions made in Tokyo, one of the main financial centres of the world. However this study has also sought to explore a more complex reality; namely, that this place also became the interface of complex cultural forces and perceptions. The wealth of the Japanese investors on the Gold Coast enabled them to realize their dream of developing projects in the most fashionable global styles. These styles were essentially Western, and it was onto these that their Japanese owners ascribed their own meanings; meanings that reflected the cultural baggage that they had brought from Japan, and through which were filtered the economic and environmental realities of the Gold Coast. The Gold Coast as locality also included residents. Hence it became an interface between two different groups of people, the Japanese and the strongly Anglo-Celtic local community. Some in the local community perceived the Japanese presence as a threat to their perception of the Gold Coast, in fact, a threat to their perception of Australia's national identity. A campaign based on the politics of memory of the Japanese developed on the Gold Coast. Within weeks it became a national debate in which isolationalist, if not xenophobic traditionalists, concentrated on the Gold Coast challenged the economic rationalism and multicultural tolerance of the self-interested and ideologically convinced advocates of globalization. Governments at all levels sought to arbitrate, to legitimize standpoints, but more often than not were seen to move into positions of ineffectual flexibility. The forces of globalization on the Gold Coast were catalysts for change that in turn provoked local opposition which rapidly became a debate about national identity and direction. It is in the exploration of the complex and contradictory economic, cultural and political forces engendered by globalization that this study has sought to make a distinctive contribution.

The halloween effect and Japanese equity prices : myth or exploitable anomaly

Bouman and Jacobsen (American Economic Review 92(5), 1618–1635, 2002) examine monthly stock returns for major world stock markets and conclude that returns are significantly lower during the May–October periods versus the November–April periods in 36 of 37 markets examined. They argue that, in general, the Halloween strategy outperforms the buy and hold strategy thereby casting doubt on the validity of the efficient market paradigm. More recently, Maberly and Pierce (Econ Journal Watch 1(1), 29–46, 2004) re-examine the evidence for U.S. equity prices and conclude that Bouman and Jacobsen’s results are not robust to alternative model specifications. Extending prior research, this paper examines the robustness of the Halloween strategy to alternative model specifications for Japanese equity prices. The Halloween effect is concentrated in the period prior to the introduction of Nikkei 225 index futures in September 1986. After the internationalization of Japanese financial markets in the mid-1980s, the Halloween effect disappears.

Prelude to the birth of Wayo-Secchu (Japanese hybrid style) in Japanese early modern architecture

This paper will investigate the background of the emergence of Wayo-secchu (Japanese Hybrid Style), by re-examining the rhetoric of the government-oriented early Meiji Western style architecture and Japanese traditionalism's reaction to it. I will elucidate the undercurrent of the intentional shift in nineteenth-century Japan towards the recuperation of traditional Japanese style, a shift which initiated the Japanese hybrid style we now call Wayo-secchu. I will discuss the effect of institutional pressure to Westernize, by investigating what was meant by a new architectural method as expressed by the government of the time.

Narrative analysis of female student 'resistance' in a Japanese private university

The thesis points to the emergence of a series of distinctive tensions which were informed by the author's position as a Western male researcher living in Japan, and the changing perceptions of what occured as notions of 'empowerment' and 'voice' touched the 'grounded' data. It argues that the generative narrative(s) constitutes a form of ongoing 'conversation' which succeed in producing an unstructured reading or pedagogy. Although the research does not achieve tangible liberatory outcomes, the generative narrative(s) provides the lens through which to view the student 'resistance' and, as such, permits the examination of an instance of student 'resistance' in Japan.

Team teaching and communicative language teaching in Japanese secondary schools

Explores team teaching and communicative language teaching in Japanese schools. The study's first phase uses the ethnographic approach of participant observation. The second phase uses eleven case study interviews to discover the teachers' conceptions of communicative language teaching. Identifies elements of team taught lessons and elucidates the conceptions of communicative language teaching held by a sample of teachers.

Fractured lives : Australian prisoners of war of the Japanese and their families

Examines how the particular nature of captivity by the Japanese during World War II intensified and complicated the impact, legacy and memory of war for POWs and their families. It presents insights into the experience of the prisoners' wives and how battalion associations protect and promote the remembrance of war.

A case study exploring the sociocultural characteristics of adult Japanese ESL learners in Australian EAP programs

Research findings show that the poor level of English accomplishment amongst Japanese students in English as Second Language (ESL) settings continues to be an issue of concern. This interpretative study adopted an ethnographic case method to explore and advance reader’s understanding of Japanese learner’s sociocultural characteristics and, also, to investigate how cross-cultural similarities/ differences between the sociocultural heritage of Japanese learners and the contextual factors of Australian English for Academic Purposes (EAP) study abroad programs interact. This study aims to interpret the problems surrounding the poor performance of Japanese students in Australian ESL contexts and identify issues not present in the literature that warrant further investigation. Interviews, structured by a thematic reporting framework, were used as the interpretive instrument for data collection. Data, supported by the reporting framework, was analysed using a constant comparative method. The exploratory nature of this report led to the following conclusions. Firstly, Japanese students’ past educational experience interferes with Second Language Acquisition (SLA) in Australian EAP study abroad programs. Secondly, Japanese students have a predisposition towards integrative motivation. Thirdly, significant others influence Japanese learners’ ability to cope with transition issues, such as managing academic and social problems. Finally, contextual factors of Australian EAP programs (e.g. course materials, teaching and learning methodology and assessment) negatively impact English language learning. This study raises questions about the difficulties experienced by Japanese learners in Australian EAP study aboard programs.