Crucial factors determining the spatio-temporal distribution patterns of threeAthalia sawflies feeding on common cruciferous plants

Summary ThreeAthalia sawflies,A. japonica, A. rosae andA. infumata, feeding on cruciferous plants, coexist in Japan. However, it is not known what ecological strategies they use and what environmental factors are crucial to such strategies. I attempted to explain these questions by examining the relationship between the spatio-temporal distribution patterns of threeAthalia sawflies and their habitats in three districts (Lowland, Intermediate and Mountain). The three sawflies have different spatio-temporal distribution patterns, though they usually used common cruciferous plants.A. japonica was abundant in spring and autumn but disappeared during summer in all the districts. In the Lowland, populations ofA. rosae andA. infumata, like that ofA. japonica, crashed in summer. HoweverA. rosae occurred mainly in summer in the Intermediate and Mountain. AlthoughA. infumata occurred in the same seasons asA. rosae in all districts, population levels ofA. infumata were always lower than those ofA. rosae. The crucial factors controlling their population patterns were the availability of host plants and temperature. Population crashes ofA. rosae andA. infumata were due to food depletion, and those ofA. japonica were due to heat stress. On the other hand, their population patterns may be interpreted as phenological synchronization with their original host plants, though they all existed on common cruciferous plants. The three sawflies may have evolved different strategies to escape from unfavorable habitat conditions. Such strategies are speculated to be summer diapause inA. japonica, long distance migration inA. rosae, and local dispersal inA. infumata.     

Why does onlyAthalia Japonica enter summer diapause among three sympatricAthalia sawflies feeding on crucifers?

Summary This report assesses the primary factor for the evolution of summer diapause of the three species of sawfly,Athalia japonica, A. rosae andA. infumata that feed on cruciferous plants and coexist in the same area.A. japonica has two discrete spring and autumn generations, butA. rosae andA. infumata 5–6 generations. OnlyA. japonica enters summer diapause in response to the long daylengths in spring. Although these three sawflies usually feed on the same cultivated crucifers, they differ markedly in the utilization of wild crucifers. They oviposit only on young leaves.A. japonica mainly usesCardamine plants which sprout in spring and autumn.A. rosae andA. infumata primarily use hosts with new leaves all the year round, i.e. cultivated crucifers andRorippa indica, respectively. The thermal threshold for development is lower inA. japonica than in the other two species. The low heat tolerance ofA. japonica is adapted only to cool shady habitats whereCardamine grows. Presumably, summer diapause ofA. japonica is adaptation to the deterioration of the primary host plants rather than unfavorable climatic conditions. This interpretation is supported by the movement patterns of the threeAthalia sawflies, alternative means to escape from deteriorated habitat conditions.     

Movement patterns of threeAthalia sawflies in relation to the spatio-temporal distributions of their habitats

Summary I compared the differences in the movement intensity of three species of sympatricAthalia sawflies,A. japonica, A. rosae andA. infumata feeding on cruciferous plants. Mark-release-recapture census was conducted to estimate movement distance, sex ratio and age composition of adult sawflies. In addition, the sex ratio of newlyemerged adults was examined by rearing field-collected larvae until adult emergence. Age composition and longevity of adults were estimated experimentally. The movement intensity was evaluated mostly with the indirect information thus obtained. Females moved more actively than males in all three sawflies.A. japonica females of all age classes moved actively in spring and autumn, but in summer they disappeared. Also,A. rosae females of all age classes moved actively in spring and autumn. In summer, in contrast withA. japonica, A. rosae females moved most actively among the three species in all seasons.A. infumata females, in particular the young females, moved most actively among the three species, exceptA rosae in summer. The movement patterns of the three sawflies were deduced in relation to the spatio-temporal distributions of their habitats. In spring and autumn, when host plants were abundant,A. japonica andA. rosae females were dispersed among the host patches within the census are. In summer, however, when host plants were scarce,A. japonica entered diapause, whereasA. rosae migrated to neighboring areas. On the other hand,A. infumata, in particular young famale, innately dispersed to seek for temporary host plants throughout the census seasons.     

Alcoholics anonymous and gay American men

Self-help groups can be powerful tools for self-change. Thus, counselors and other professionals are wise to consider referrals to such groups when possible. In this article, the nature of self-help groups is explored in general, and Alcoholics Anonymous (A.A.) in particular. A.A. was chosen because it is the "grandparent" of all 12-Step groups, it has proven effective over time, and because of the pandemic incidence of alcoholism among homosexual American men. Therefore, professionals should be well aware of this invaluable resource for the treatment of alcoholism. This article explores the homosexual alcoholic man in relation to A.A., as well as how professionals may be supportive of the gay A.A. member. Finally, some suggestions are provided about how rural homosexual alcoholic men might be better treated.     

Model analysis of the effect of environmental fluctuation on the species replacement pattern of pelagic fishes under interspecific competition

Summary There are two factors affecting long-term fluctuation of planktotrophic pelagic fish: environmental fluctuation and interspecific competition. Long-term catch data of planktotrophic pelagic fishes in Japan suggest that the chub mackerel (species B) was replaced by the sardine (A), A was replaced by the anchovy, Pacific saury and horse mackerel (Group C), and species in group C were replaced by species B. If species A defeats B, B defeats C, and C defeats A in interspecific competitive ability, then the abundance of these three groups fluctuate forever and dominate in the same order. We call this cyclic advantage hypothesis for species replacement. In this model, environmental fluctuation affects the species replacement as a trigger. Environmental fluctuation does not determine the next dominant species but greatly affects when the next replacement occurs.     

Footprints in the Sand: Personal,Psychological, and Relational Profiles of Religious,Spiritual, and Atheist LGB Individuals

The present study offers a comparison of the demographic features and lived experiences of lesbian, gay, and bisexual (LGB) individuals with religious, spiritual, or atheist (R/S/A) belief systems. In this sample of 212 participants, the relationship of participants’ R/S/A beliefs to personal variables (e.g., age, gender, race), mental health variables (e.g., life satisfaction, psychological distress, internalized heterosexism, self-esteem), and relational variables (e.g., outness, connection to LGBTQ communities) were assessed. Correlational analyses indicated that level of R/S/A belief was unrelated to self-esteem, life satisfaction, or psychological distress; however, greater religious belief was correlated positively and significantly with internalized heterosexism and outness as LGB. To test the interactions of R/S/A beliefs and categorical variables of interest (e.g., race), log-linear analyses with follow-up chi-square tests were conducted. Findings suggested more similarities than differences for LGB people across R/S/A systems of belief. Limitations and implications for future research are discussed.     

Optimal Treatment Schedule in Insect Pest Control in Viticulture

A model for the control of the European grapevine moth Lobesia botrana includes two control methods: insecticides and mating disruption. It yields the combination and schedule of application that minimize cost and losses due to the pest. A simulation is presented for an experimental situation.     

城市化模式选择与我国“三农”问题

农民收入严重偏低、城乡收入差别过大是我国“三农”问题的突出表现。实现全面小康和构建和谐社会,必须彻底解决“三农”问题。通过对我国“三农”问题的本质解析,指出解决中国“三农”问题的关键在于大量减少农民数量,实施城市化战略。农村城市化不但是解决“三农”问题的关键,也是建设全面小康社会和构建和谐社会的一个必然过程和选择。     

A study of internal migration in England and Wales : Part I

Abstract Statistics ofpersons classified jointly by county of birth and county ofresidence have been published in the England and Wales census volumes since 1851 and the present study draws mainly on these data. A group of persons recorded in a census as natives of county A and residents of county Bare sometimes referred to as lifetime migrants from county A to county B. Statistics of lifetime migrants have often been used in studies of internal migration but these have one great disadvantage. The number of lifetime migrants from A to B does not relate to a specific period of time. It is impossible, for example, in such studies to consider the association between specific migration streams and differential economic activity. An attempt is made in this study to transform lifetime migration data into intercensal migration streams. Some of the results are presented and the most significant migration patterns during the period 1851-1951 are described.     

从人口普查看美国200余年社会政治的变化

自 1790年到 2 0 0 0年 ,美国每隔十年就进行一次人口普查。本文根据美国人口普查的历史资料和 2 0 0 0年人口普查的最新资料 ,对 2 0 0余年来美国社会经济及政治的变化进行了分析。     

BOOK REVIEWS

Books reviewed in this article: Vaclav Smil, Feeding the World: A Challenge for the Twenty‐First Century Robert William Fogel, The Fourth Great Awakening and the Future of Egalitarianism Massimo Livi Bacci, The Population of Europe: A History Richard G. Rogers, Robert A. Hummer, and Charles B. Nam, Living and Dying in the USA: Behavioral, Health, and Social Differentials of Adult Mortality     

BOOK REVIEWS

Book reviewed in this issues. Low‐Cost Routes to Good Health: A Review Essay Review of James C. Riley, Low Income, Social Growth, and Good Health: A History of Twelve Countries. Gregory Clark A Farewell to Alms: A Brief Economic History of the World Tomas Frejka , Jan M. Hoem , Tomá? Sobotka , and Laurent Toulemon (eds. ) Childbearing Trends and Policies in Europe (Special Collection 7, Demographic Research, Volume 19, July 2008) Susan Greenhalgh Just One Child: Science and Policy in Deng's China     

Dual record demographic surveys: A re-assessment

Summary A Review of 'Population Growth Estimation': A Handbook of Vital Statistics Measurement, by Eli S. Marks, W. Seltzer and K. J. Krotki. pp. 496.     

A midwife program of newborn resuscitation

A very small proportion of newborns fail to establish a normal respiratory pattern without some assistance at birth and newborns requiring resuscitative measures at birth should have a skilled practitioner able to provide it. In this small hospital midwives felt unskilled in newborn resuscitation and paediatricians were not always immediately available. A stakeholder group gathered to discuss the problem. A training program was implemented that improved the skills, confidence and support of the attending midwife to resuscitate the newborn effectively. The aim was to improve the outcome for the infant whilst maintaining the mother's choice of birthing in a small local hospital close to family and friends.     

A study of internal migration in England and Wales : Part I

Statistics ofpersons classified jointly by county of birth and county ofresidence have been published in the England and Wales census volumes since 1851 and the present study draws mainly on these data. A group of persons recorded in a census as natives of county A and residents of county Bare sometimes referred to as lifetime migrants from county A to county B. Statistics of lifetime migrants have often been used in studies of internal migration but these have one great disadvantage. The number of lifetime migrants from A to B does not relate to a specific period of time. It is impossible, for example, in such studies to consider the association between specific migration streams and differential economic activity.

An attempt is made in this study to transform lifetime migration data into intercensal migration streams. Some of the results are presented and the most significant migration patterns during the period 1851–1951 are described.     

A Probabilistic Perspective on Re-Identifiability

A quasi-identifier is a set of attributes that can be used to re-identify entries in anonymized data sets. A group of individuals is considered about whom quasi-identifying numerical information is disclosed such as date of birth, age, weight, and height. The fraction of individuals is determined whose information is unique in that group and hence is identifiable unambiguously. Nonuniformity can be captured well by a single number, the Kullback-Leibler distance. For example sets of real microdata, given approximations based on Kullback-Leibler distances are accurate. Second, the effect of disclosing more specific or less specific information is analyzed experimentally. Third, the effect of correlation between numerical attributes is measured. A formula gives the re-identifiability level. The approximations are validated using publicly available demographic data sets.     

A note on the population of seventeenth century London

A least-squares analysis of the various estimates of the population of London during the seventeenth century discloses the probable degree of error in the work of William Petty and other early demographers. A new “average” population is calculated and the regression equation given which best satisfies the contemporary estimates.     

Using Alternate Forms of the Multidimensional Health Locus of Control Scale: Caveat Emptor

This study examined whether Forms A and B ofthe Multidimensional Health Locus of ControlScale (MHLCS) are parallel by comparing (a)mean performance on the internal, powerfulothers, and chance subscales, (b) the internalconsistency and one-week test-retestreliability estimates for each of thesubscales, (c) the intercorrelations among thesubscales, (d) the relationship betweenself-rated health status and each of thesubscales, and (e) the fit of the three-factorstructure for the MHLCS proposed by Wallston etal. (1978) using confirmatory factor analysis(CFA). A non-clinical sample (N = 245) wasused. Overall, the results of the study do notsupport treating Forms A and B of the MHLCS asparallel or exchangeable forms. Directions forfurther revisions to the MHLCS are proposedbased on both the present study as well asfindings from the literature.     

Intelligence and family size

This paper describes the results obtained in administering a modified Terman intelligence test to 327 Greek children aged from 7 to 12 years. A negative correlation between intelligence and family size was obtained. The results are compared with those obtained in similar inquiries in Britain and the U.S.A.