Investigation into the edge effect by use of capture-recapture data in a vole population

Summary A substantial explication of the edge effect has been attempted by use of capture-recapture data for a vole population (Microtus montebelli), gathered intwo plots of 100×100 m or less during 12 days, cheked twice daily, in August 1970; the sample was quite sufficient for the aim. The edge effect as guessed by increased catch per trap is usually suspected to ensue from range-settlers in the outside boundary strip of a plot and immigrants. But by a theoretical analysis I could attain a tentative conclusion that no increased catch per trap will occur unless any invasion takes place. Then it follows that, apart from the effect of invasion, the role of the adjoining outside settlers in the edge effect is essentially required to be studied in the light of knowledge on the truth of size and shift in home range. The variation in range behavior for 183 adult voles, captured 6 times or more, could be grouped into eight types, of which the range-conservative type possessed 52% of the sample and the group of the type was justly utilized for giving averages of range size. Besides, it was seen from the observed frequency of types that a considerable number of immigrants onto the census plot were induced perhaps being allured by trap baits, but the majority of them proved to be assigned to the voles that have their ranges inside the assessment line ofDice; the rest referable to effective immigrants was only a few (7%). I could perceive no reason such as disproves the idea ofDice’s additional boundary strip. Viewed from maps of ingress shift of ranges, the effect of ingress must have been greater in the outer trap rows than in the inner within the plot, so that it might well be called edge effect in general; such effect, however, is seen gradually diminishing toward the center, and hence it is almost unlikely that one should find any clear-cut intra-plot assessment lines demarcating such an inner square as quite free from edge effects. Averages of observed range length and width (ORL and ORW), as reliable measures for the true range size, were determined from the above group of specimens; as a result, the remarkable concept of elliptic range shape was established by regarding ORL as long axis and ORW as short one, and, directly from these averages, the mean range sizes worked out at 0.04 for females and 0.09 for males in acreage which proved to be surprisingly well agreeable with those of isotope-revealed ranges for voles given byGodfrey (1954) andAmbrose (1969). The catchability for marked voles ( ) was estimated by the maximum likelihood method by use ofJolly’s formulae (1965), but that for unmarked ones ( ) was made by the regression census formula; as a result it was shown that the population was clearly of π>p type and that the trap-experience that voles underwent one month or more ago can make them retain as high catchability as π. Contribution from JIBP-PT No. 110, carried out by the grant from the expenditure of Education Department to the specific study on “Dynamics of Biosphere”.     

Constructing Optimal Instruments by First‐Stage Prediction Averaging

This paper considers model averaging as a way to construct optimal instruments for the two‐stage least squares (2SLS), limited information maximum likelihood (LIML), and Fuller estimators in the presence of many instruments. We propose averaging across least squares predictions of the endogenous variables obtained from many different choices of instruments and then use the average predicted value of the endogenous variables in the estimation stage. The weights for averaging are chosen to minimize the asymptotic mean squared error of the model averaging version of the 2SLS, LIML, or Fuller estimator. This can be done by solving a standard quadratic programming problem.     

Japanese Modernity and Media Studies of Screens

This article aims to construct a new perspective for analyzing the recent omnipresence of screens, the diversity of images, and their impact on our daily lives. Because of the diversification of digitalized images today, research based on film and television studies is unable to grasp the fluid relationships among screen images, spaces, and the bodies of their audience, and important task for recent scholarship is to determine how to include these screen images in media and cultural studies. In response to this issue, this article seeks to reconstruct the concept of screen practice, guided by the perspectives of Jonathan Crary and Friedrich Kittler on media and practices; Koji Taki and Ai Maeda's historical research on Japanese modernity; and Erkki Huhtamo and Yussi Parikka's media archaeological perspectives for screen and visual culture. Although the notion of screen practice was originally proposed in the field of film history, it should be expanded for broader screen cultures as the sites at which scientific discourses and technologies act on the bodies of viewers. Taking the experiences of Japanese modernity as its subject, this is a critical issue, because at these sites we can find traces of dynamic negotiations between the circulation of science and media derived from Western modernity, and existing physical and cultural vernacular practices. Moreover, going back to the screen cultures at the end of the 19th century will make clear how the process of our contemporary media environment was formed.     

New regression formula to estimate the whole population for recapture-addicted small mammals

Summary We have devised a census formula of curvilinear regression suitable for capture-recapture data of recapture-addicted populations of the Japanese field vole (Microtus montebelli) obtained under a grid-plan with single-catch traps in order to estimate the whole population. The equation is founded on the assumption that the trappable population on the initial day is increased in way of an exponential curve until it reaches to the whole during one trapping period. The effect of trap-preoccupation by marked and multiple collisions is considered in the formula. As a result of its application to field data of the vole, it has turned out that the equation is required for the data gained under the trapping plan with trap spacing 10m, but not for those under the plan with spacing 5m, to estimate the whole. A convenient method of analysis of the formula is offered here, but we have been yet unable to introduce assymptotic variance of estimates. Contributions from JIBP-PT No. 19, carried out by the grant from the expenditure of Education Department to the specific study on “Dynamics of Biosphere”.     

Inquiry into effects of prebaiting on removal census in a vole population

Summary A field work with two plots of grid, a snap trap being set on each station spaced 5 m apart, was executed in the summer of 1968 to evaluate prebaiting in census trapping by comparing the result in one plot, prebaited for three days, with that in the other not prebaited. Since the population was as high as some 230 per acre on the average in density and formed of the vole,Microtus montebelli, alone, sufficient samples were gathered irrespective of the plot size as small as 50×50 m. Owning to the circumstances, multiple collisions inflicted so intense influence on sampling especially in the prebaited plot thatz-equation for census adjusted to the effect was well applicable to the data in either plot. In sampling, the fact that small voles are apt to be caught later than large voles was statistically evidenced in either sex, and yet any proof that males tend to be caught prior to females was not offered. It was ascertained in either plot that the daily catch was realized according to the same rule through the whole period of trapping in both external belt and internal square within the plot; hence it follows that no considerable immigration occurred. One of the beneficial effects of prebaiting is sure to be that the probability of capture was markedly enhanced in the prebaited plot, and a second is supposed, though inconclusively, to be that a good sampling could be executed consistently through the census period giving rise to no inordinate catches perhaps due to heterogeneous sampling as was seen in earlier days in the not prebaited plot. The supposition has derived from the condition that most of the whole population is trappable, which is established by interrelation among population density, size of home range and trap spacing. It was suggested that the effect of prebaiting should be evaluated from the view-point of the interrelation, because the basic utility of prebaiting consists in that it may help to our utlimate purpose to estimate the whole population. Contribution from JIBP-PT No. 55, carried out by the grant from the expenditure of Education Department to the specific study on “Dynamics of Biosphere”     

Population dynamics of the Smith's red-backed vole in highlands of Shikoku

Summary and Conclusion Population dynamics of theSmith's red-backed vole predominantly common through uplands of Shikoku have been in some degree disclosed by the use of my own and Government Forest Station's samples collected since 1955 onward. It has proved that the upper-range population reaches its density peak possibly in late summer or early fall, but the lower-range one does probably in October–November as the seasonal trend in usual years. The upper one produced a peak three times at 3–4 year intervals, the first peak being an outbreak followed by a crash, during the last decade. It seems likely that all the populations through the range have, in the gross, fluctuated in phase after 1959 at least. The cyclic fluctuation may readily be explained by the theory of intrinsic mechanism, because no external factors are considered to have exerted a conclusive effect. Except what was concerned in the outbreak, the role of the social stress could be set at naught. The regulation of fecundiy by density was expressed more markedly in litter size and less in active reproductivity rate and incidence of pregnancy. The mean litter size at term as small as 2.00 is contrary to our expectation in view of the supposed prolific potential, nevertheless the observed frequency of litter poduction and intra-uterine survival rate has proved not to be so high as to make up for the small litter size. The problem in the postnatal mortality has remained to be solved.     

Generalized average rules as stable Nash mechanisms to implement generalized median rules

We consider a problem in which a policy is chosen from a one-dimensional set over which voters have single-peaked preferences. While Moulin (Public Choice 35:437–455, 1980) and others subsequent works have focused on strategy-proof rules, Renault and Trannoy (Mimeo 2011) and Renault and Trannoy (J Pub Econ Theory 7:169–199, 2005) have shown that the average rule implements a generalized median rule in Nash equilibria and provide an interpretation of the parameters in Moulin’s rule. In this article, we first extend their result by showing that a wide range of voting rules which includes the average rule can implement Moulin’s rule in Nash equilibria. Moreover, we show additionally that within this class, generalized average rules are Cournot stable. That is, from any strategy profile, any best response path must converge to a Nash equilibrium.     

Conditional Difference Asymmetry Model for Square Contingency Tables with Nominal Categories

This paper proposes a model, which is an extension-of-symmetry model, for square contingency tables with the same nominal row and column classifications. The model states that the absolute values of difference between the conditional probability that an observation will fall in cell (i, j) on condition that it falls in cell (i, j) or (j, i) and the conditional probability that it falls in cell (j, i) on the same condition, are constant for every i≠j. The model describes a structure of asymmetry (not symmetry), and it is applied to the data on a nominal scale. An example is given.     

Your Money or Your Life: Behavioral and Emotional Predictors of Money Pathology

This study sought to examine self-reportedemotional and behavioral correlates of money pathology,defined as inappropriate behavior with respect to moneyand associated material goods. In all, 267 British adult subjects completed a battery ofquestionnaires including Rubinstein's (1981) extensivePsychology Today survey on money and Forman's ipsativemeasures that describe five Money Pathology Scales(miser, spendthrift, tycoon, bargain hunter, gambler),an overall pathology scale combining the five and hisshort moneysanity measure. The former measure was factoranalyzed and selected factor scores regressed on to the moneysanity measure along withdemographic measures in order to attempt to establishwhich individual difference factors best predicted thedifferent types of money pathology. Thus females were more extravagant, prone to depression, but lesslikely to take moral risks for money, while richer, moreright-wing people tended to be more materialistic. Thosewith overall less money sanity tended more to believe luck and dishonesty were moreimportant in making money; were self-denying andeconomically pessimistic, and had powerful negativeemotions like anger and anxiety around money. Multiple regressions on to the money types showed thatbetween 15 and 30% of the variance could be explainedand accounted for, by the selected independent variables(demographic, religious and political belief, illness, and more general attitudes towardwealth). Demographic variables like age, and negativeemotions about money were consistent predictors of moneypathology. Results are discussed in terms of the small, but growing literature on the psychologyof money (Furnham, 1997; Furnham & Argyle,1998).     

Partisan difference in social desirability bias on anti-immigrant sentiments: Covert and overt expression among French voters

Various types of anti-immigrant sentiments have been taken as the characteristic independent variable to explain specific support for radical right parties. However, some survey respondents tend to conceal their attitudes towards socially sensitive issues. To overcome this challenge, the present study used a list experiment method (item count technique) to reveal respondents' covert attitudes towards immigrants (and compared these with overt expressions) based on party support in France. Results indicated similar levels of anti-immigrant sentiments among radical right National Front supporters and other centre-rightist parties. In addition, comparison with the direct question method revealed that while supporters of centre-right parties were reluctant to express their anti-immigrant sentiment in overt expressions, National Front supporters willingly expressed it overtly more than in covert expressions. Using regression analysis, this paper demonstrates the diversity of anti-immigrant norms and the social desirability bias gap in the French political space.