Adult Immigration Research Articles

Surveillance of HIV in the United States and England, Wales, and Northern Ireland

Surveillance of HIV in the United States and England, Wales, and Northern Ireland

A Study of Haitian Immigrant’s Assimilation to Western Practices of Using the Telephony and Internet Technologies / Proučavanje Asimilacije Imigranata Sa Haitija Na Zapadnjačku Praksu Korišćenja Telefonskih I Internet Tehnologija

Abstract This study examines the relationship between the use of technology to stay connected with home country and culture while adapting and integrating into the host culture. Through a survey the authors probe into how Haitian immigrants living in South Florida with varying levels of contact with their home country acculturate into the receiving society, exploring an increasingly salient experience of contemporary global migrants. Immigration is the experience of acculturation by individuals and the emergence of culturally plural societies, where both immigrants and host country citizens can live together in a positive environment. In this study, we report our exploratory findings and insights from a survey conducted among Haitian immigrants in South Florida area, studying the relationship between the scope of their electronic communication, and their level of integration into the mainstream American culture. Considerable research has been devoted to the understanding of immigration, acculturation and adaptation of adults, but much less has addressed these phenomena among Haitian population in reference to the use of communication technologies to keep in touch with their loved ones overseas and being fully adapted to their host country at the same time, asserting both identities. In other words, to what extend Haitians who wish to have contact with American culture, while maintaining their cultural attributes do so through the Internet and telecommunication technologies. The objective of this study is to explore the correlation between cultural integration process and the level of Internet and telephony technologies usage among Haitians living in South Florida. The Internet and telephones are a necessity becoming central for one’s knowledge of environment, for the retention of one’s social contacts but also for the organization of one’s life. This is especially true for immigrants who often rely on their new and old social networks in order to adjust to the host country. This study looks at five well understood measures or indicators of the acculturation process, namely language proficiency, language use, length of time in the host culture, age, and peer contact. It also looks at the preferences of Internet related tools to contact friends and relatives both in Haiti and the USA by email, text messaging, and social sites. In our study, highly integrated Haitian immigrants are those who are young, have lived here for a long time, are proficient in Creole and English, speak to friends and relatives in both languages, and spend their free time with both Americans and other Haitians.

감귤원과 그 주변 기주식물에서 볼록총채벌레의 연중발생 양상

제주지역 노지감귤에서 2007년부터 볼록총채벌레 Scirtothrips dorsalis Hood에 의한 피해가 증가하고 있으나 시기별 발생특성에 관한 연구는 명확하지 못한 실정이다. 본 연구에서는 감귤원 주변에 분포하고 있는 볼록총채벌레의 기주식물 종류와 이와 연관된 발생특성을 구명하였다. 감귤원 주변에서 조사된 볼록총채벌레의 기주식물은 수목류 23과 39종, 초본류 10과 15종으로 총 32과 54종이었다. 조사된 기주식물 중 볼록총채벌레 제1세대 발생과 관련된 것은 인동덩굴과 사위질빵, 송악, 아왜나무였으며, 이들 식물에 월동성충이 3월 하순~4월 상순에 산란하여 성충이 4월 하순~5월 하순에 발생되는 것으로 추정되었다. 감귤 피해와 관련된 기주식물은 예덕나무와 동백나무 그리고 사위질빵, 계요등, 거지덩굴 같은 덩굴성 식물이었다. 황색끈끈이트랩을 감귤나무와 감귤원 경계에 설치하여 볼록총채벌레의 시기별 발생밀도를 조사한 결과 비슷한 발생양상을 보였으며, 연간 7세대를 경과하는 것으로 추정되었다. 감귤 열매에 피해를 주는 시기는 6월 하순~7월 상순과 8월 하순~9월 상순으로 어린 열매와 성숙 초기 2회에 걸쳐 피해를 주며, 이는 각각 볼록총채벌레 제 3세대와 제 6세대 성충 발생 최성기와 일치하였다. 볼록총채벌레 발생밀도는 기주식물의 새순 발생량에 따라 차이가 컸으며, 감귤원 주변 기주식물에서 번식한 후 감귤나무로 이동하여 피해를 주는 것으로 나타났다. The damage of citrus by Scirtothrips dorsalis Hood appears to have increased since 2007 in Jeju, although the characteristics of seasonal abundance are not clear. This study was conducted to investigate the relationship between host plants and the seasonal abundance of S. dorsalis, observing plants distributed around citrus orchards. The host plants of S. dorsalis surrounding citrus orchards were determined to include 32 families, 54 species: 39 woody plant species and 15 herbaceous plant species. The host plants which related to the occurrence of 1st generation of S. dorsalis were Lonicera japonica, Clematis apiifolia, Hedera rhombea, and Viburnum awabuki. The occurrence of 1st generation S. dorsalis was estimated to be due to overwintered female adults having laid eggs into those plants from late March to early April, and the new adults having emerged from late April to late May. The host plants which were associated with fruit damage of citrus were Mallotus japonicus, and Camellia japonica, as well as creeping plants such as Clematis apiifolia, Paederia scandens and Cayratia japonica. The adult phase density of S. dorsalis caught on yellow-color sticky traps placed on the citrus trees on the edge of the citrus orchard. S. dorsalis were predominantly 3rd generation from late of June to early of July, and 6th generation from late of August to early of September, and their numbers were directly related to the degree of damage caused to the citrus fruit. The density of S. dorsalis depended on the number of new growing shoots of host plants, which indicated that the immigration of adults of S. dorsalis to the citrus was based in the suitability of host plants surrounding the orchards.

Immigration and Recruitment in an Urban White-Winged Dove Breeding Colony

Abstract Dove population management necessitates estimates of vital rates for use in mechanistic models used to evaluate and predict population responses to environmental variation and/or alternative harvest scenarios. Estimating recruitment (number of juveniles per adult) is complicated because a compendium of factors drives production in doves. White-winged doves Zenaida asiatica exhibit a fairly unique breeding strategy wherein they commonly return to the same breeding area and reproduce in large breeding aggregations (i.e., colonies). We used an open-population capture–recapture model to estimate annual immigration and in situ recruitment of white-winged doves breeding in an urban colony during 2009 and 2010. We captured 5,101 unique white-winged doves in 2009 (2,894 after hatch year, 2,207 hatch year) and 3,502 unique white-winged doves in 2010 (3,106 after hatch year, 486 hatch year). Immigration of adults into the breeding colony peaked during late April and early May, with in situ recruitment occurring during a 6-wk period from 19 June to 30 July. Our results predicted that >90% of all hatch-year individuals had entered the local population by 1 August. The Jolly–Seber model used allows white-winged dove recruitment values to be estimated directly (rather than as a conglomerate of multiple parameters), separates immigration from in situ recruitment within a season, and can be useful for monitoring recruitment and evaluating alternative recruitment indices for future use in harvest management-planning actions.

Evaluating the Effects of Population Management on a Herbivore Grazing Conflict

Abundant herbivores can damage plants and so cause conflict with conservation, agricultural, and fisheries interests. Management of herbivore populations is a potential tool to alleviate such conflicts but may raise concerns about the economic and ethical costs of implementation, especially if the herbivores are ‘charismatic’ and popular with the public. Thus it is critical to evaluate the probability of achieving the desired ecological outcomes before proceeding to a field trial. Here we assessed the potential for population control to resolve a conflict of non-breeding swans grazing in river catchments. We used a mathematical model to evaluate the consequences of three population management strategies; (a) reductions in reproductive success, (b) removal of individuals, and (c) reduced reproductive success and removal of individuals combined. This model gave accurate projections of historical changes in population size for the two rivers for which data were available. Our model projected that the River Frome swan population would increase by 54%, from 257 to 397 individuals, over 17 years in the absence of population control. Removal of ≥60% of non-breeding individuals each year was projected to reduce the catchment population below the level for which grazing conflicts have been previously reported. Reducing reproductive success, even to 0 eggs per nest, failed to achieve the population reduction required. High adult and juvenile survival probabilities (>0.7) and immigration from outside of the catchment limited the effects of management on population size. Given the high, sustained effort required, population control does not represent an effective management option for preventing the grazing conflicts in river catchments. Our study highlights the need to evaluate the effects of different management techniques, both alone and in combination, prior to field trials. Population models, such as the one presented here, can provide a cost-effective and ethical means of such evaluations.

Transnational Aging: The Impacts of Adult Children's Immigration on Their Parents' Later Lives

AbstractIn an age of international migration, we do not yet well understand the impacts of adult children's immigration processes on their parents' later lives. Drawing on data from a larger study of Chinese grandparents' caregiving experiences in Canada, this article explores three interconnected aspects of aging in a context of transnational care—the intergenerational relationships, the cultural idea of filial piety, and elder care arrangements. The findings reveal that adult children's immigration has not only changed their parents' life trajectories, it has also confirmed the relevance of state borders and multi-stranded transnational connections (e.g. material, cognitive, emotional, and symbolic) to the parents' movement into older age. I argue that in a context of transnationalism, aging can no longer be understood as solely an age-based individual experience “in place,” as it includes dynamic processes that are simultaneously shaped by various familial, social, cultural, economic, and political for...

A study of Haitian immigrant's assimilation to western practices of using the telephony and internet technologies

This study examines the relationship between the use of technology to stay connected with home country and culture while adapting and integrating into the host culture. Through a survey the authors probe into how Haitian immigrants living in South Florida with varying levels of contact with their home country acculturate into the receiving society, exploring an increasingly salient experience of contemporary global migrants. Immigration is the experience of acculturation by individuals and the emergence of culturally plural societies, where both immigrants and host country citizens can live together in a positive environment. In this study, we report our exploratory findings and insights from a survey conducted among Haitian immigrants in South Florida area, studying the relationship between the scope of their electronic communication, and their level of integration into the mainstream American culture. Considerable research has been devoted to the understanding of immigration, acculturation and adaptation of adults, but much less has addressed these phenomena among Haitian population in reference to the use of communication technologies to keep in touch with their loved ones overseas and being fully adapted to their host country at the same time, asserting both identities. In other words, to what extend Haitians who wish to have contact with American culture, while maintaining their cultural attributes do so through the Internet and telecommunication technologies. The objective of this study is to explore the correlation between cultural integration process and the level of Internet and telephony technologies usage among Haitians living in South Florida. The Internet and telephones are a necessity becoming central for one's knowledge of environment, for the retention of one's social contacts but also for the organization of one's life. This is especially true for immigrants who often rely on their new and old social networks in order to adjust to the host country. This study looks at five well understood measures or indicators of the acculturation process, namely language proficiency, language use, length of time in the host culture, age, and peer contact. It also looks at the preferences of Internet related tools to contact friends and relatives both in Haiti and the USA by email, text messaging, and social sites. In our study, highly integrated Haitian immigrants are those who are young, have lived here for a long time, are proficient in Creole and English, speak to friends and relatives in both languages, and spend their free time with both Americans and other Haitians.

Modeling a Regime Shift in a Kelp Forest Ecosystem Caused by a Lobster Range Expansion

The South African West Coast rock lobster, Jasus lalandii (H. Milne-Edwards, 1837), has expanded its range to the southeast, where its abundance has increased radically. The ecological consequences of this are likely to be considerable. We employed a minimally realistic model to simulate the and to explore interactions of J. lalandii with the sea urchin, Parechinus angulosus (Leske, 1778), and the abalone, Haliotis midae Linnaeus, 1758, juveniles of which shelter beneath this urchin. Model fits to empirical data were good, although species-interaction terms were difficult to estimate. Base-case trajectories indicated: (1) Lobster biomass peaked at about 1000 t in 1994 and was then reduced by fishing to a stable value approximately 50% lower by 2008. (2) Urchins remained close to carrying capacity in areas but collapsed to local extinction by 1997 in the area. (3) Abalone declined over 2000-2008 in noninvaded areas because of illegal fishing and collapsed to near zero in the invaded area because of illegal fishing combined with increased lobster abundance. Sensitivity analyses favored the hypothesis that the invasion was due to adult immigration rather than larval recruitment. Modeled 50-yr projections indicated that urchins will remain locally extinct in the area, even 50 yrs into the future. The abalone collapse in the area would persist >50 yrs, even if lobsters were absent. We argue that the lobster triggered an alternative stable state, making a return to pre-invasion conditions unlikely.

Managed metapopulations: do salmon hatchery 'sources' lead to in-river 'sinks' in conservation?

Maintaining viable populations of salmon in the wild is a primary goal for many conservation and recovery programs. The frequency and extent of connectivity among natal sources defines the demographic and genetic boundaries of a population. Yet, the role that immigration of hatchery-produced adults may play in altering population dynamics and fitness of natural populations remains largely unquantified. Quantifying, whether natural populations are self-sustaining, functions as sources (population growth rate in the absence of dispersal, λ>1), or as sinks (λ<1) can be obscured by an inability to identify immigrants. In this study we use a new isotopic approach to demonstrate that a natural spawning population of Chinook salmon, (Oncorhynchus tshawytscha) considered relatively healthy, represents a sink population when the contribution of hatchery immigrants is taken into consideration. We retrieved sulfur isotopes (34S/32S, referred to as δ34S) in adult Chinook salmon otoliths (ear bones) that were deposited during their early life history as juveniles to determine whether individuals were produced in hatcheries or naturally in rivers. Our results show that only 10.3% (CI = 5.5 to 18.1%) of adults spawning in the river had otolith δ34S values less than 8.5‰, which is characteristic of naturally produced salmon. When considering the total return to the watershed (total fish in river and hatchery), we estimate that 90.7 to 99.3% (CI) of returning adults were produced in a hatchery (best estimate = 95.9%). When population growth rate of the natural population was modeled to account for the contribution of previously unidentified hatchery immigrants, we found that hatchery-produced fish caused the false appearance of positive population growth. These findings highlight the potential dangers in ignoring source-sink dynamics in recovering natural populations, and question the extent to which declines in natural salmon populations are undetected by monitoring programs.

The changing determinants of UK young adults´ living arrangements

The postponement of partnership formation and parenthood in the context of an early average age at leaving home has resulted in increased heterogeneity in the living arrangements of young adults in the UK. More young adults now remain in the parental home, or live independently of the parental home but outside of a family. The extent to which these trends are explained by the increased immigration of foreign-born young adults, the expansion in higher education, and the increased economic insecurity faced by young adults are examined. Shared non-family living is particularly prominent among those with experience of higher education, whilst labour market uncertainty is associated with an extended period of co-residence with parents. © 2011 Juliet Stone, Ann Berrington & Jane Falkingham.

The rise and fall of local populations of ortolan buntings Emberiza hortulana: importance of movements of adult males

Changes in population size of local populations of birds have usually been interpreted in relation to adult return rate and recruitment of young individuals after natal dispersal. Little is known about the importance of redistribution of adult individuals through breeding dispersal. The small Norwegian population of ortolan buntings Emberiza hortulana has a patchy distribution with about 30 long-term local populations. During a period of general population decline (29% decrease over 7 years), the population trends of local populations (measured as number of males recorded) were highly variable, with some even increasing four-fold. Comparisons of demographic parameters showed that adult immigration rate (i.e. dispersal of adult males) explained both yearly changes in male population size and population trends over the whole study period better than adult return rate or adult emigration rate, or a measure of recruitment of young males. Adult immigration rates and recruitment rates were correlated, suggesting that both young and adult males find the same places attractive. In the study area, adult sex ratio was strongly male-biased, and immigration rate was higher when local sex ratio was less skewed. In addition, less skewed sex ratio was related to higher adult return rate and lower emigration rate. We found no relationships between measures of breeding success and population change. We suggest that conspecific attraction may explain the observed patterns. Some local populations may act as hot-spots attracting adult males from other populations. Thus, local population changes need not reflect overall population growth rate, but may be a consequence of redistribution of adult birds.

Multilingual Development in Germany in the Crossfire of Ideology and Politics: Monolingual and Multilingual Expectations, Polylingual Practices

The years since German reunification have seen changes in ideologies and policies toward societal multilingualism, linguistic pluralism of linguistic minorities. These changes have responded to the increasing diversity of minority languages as a result of immigration from the former Soviet Union and Eastern Europe, and the subsequent expansion of the European Union. At the same time, the use of polylingualism or hybrid linguistic practices in everyday, informal contexts by both migrants and Germans has risen to public prominence. In contrast to the official policies that stress German-only education as the key to academic success and social integration, the (covert) prestige and use of languages other than German, especially Turkish, by members of other ethnic groups has been rising, and hybrid linguistic practices are gaining ground, particularly among youth. This paper examines the underlying ideologies, policies, and debates, especially with respect to the role of proficiency in German for adult immigration, naturalization and integration, as well as educational polices and practices for German and other languages.

Potential re-colonisation by cladocerans of an acidic tropical pond

To predict how re-colonisation of acidified lakes will proceed, at least two approaches are possible: (i) to compare the life history traits of candidate species and determine which one has the highest fitness, and (ii) to simulate a more realistic scenario carrying out experiments with the grouping of the candidate species, so that the intrinsic rate of natural increase of each species is integrated with its sensitivity to low pH and its ability to compete with the other candidate populations. The objective of the present study was to investigate the future re-colonisation of such acidified systems, taking as case-study a tropical pond (Lagoa das Dunas, Camaçari, BA, Brazil) and four species of cladocerans occurring in nearby water bodies ( Ceriodaphnia cornuta, Ceriodaphnia silvestrii, Latonopsis australis and Macrothrix elegans), by comparing the two above mentioned approaches. The second approach included two sets of in situ microcosms experiments, one simulating the re-colonisation by immigrating ephippia, thus using neonates of each species as colonisers, and another simulating the immigration of adults. Both these simulations followed nearly the same trends. The integration of the effects of a higher temperature, a different photoperiod and species competition determined differences in the species densities ranking between the two approaches: life history versus microcosms. The densities of C. cornuta in the microcosms matched the biphasic concentration/response hormetic model, in the simultaneous presence of two increasingly intense stressors (interspecific competition and acidity), with a low-dose stimulation and a high-dose inhibition. The present study provided, thus, a further support to the acceptance of hormesis in ecotoxicology, also at the population level in multispecies experiments.

Evidence of source–sink metapopulations in a vulnerable native galaxiid fish driven by introduced trout

Introduced predators with patchy distributions can create demographic sinks within native prey populations. Such invasions may give rise to source-sink metapopulations if there are still sources of native species colonists in the landscape. In New Zealand, introduced brown trout (Salmo trutta) and rainbow trout (Oncorhychus mykiss) are linked with declines in native non-diadromous galaxiids but co-occur with these galaxiids in some locations. We investigated whether trout create sinks in Galaxias vulgaris populations, and whether trout-free reaches could act as sources, allowing persistence in the sink habitat. We conducted quantitative seasonal monitoring of G. vulgaris population structure across two subcatchments of the Waimakariri River, South Island. Two trout-free and seven trout-invaded sites in the Porter River catchment and two trout-free and five trout-invaded sites in the Broken River catchment were monitored over two winters and the adjoining summer. Spatially continuous monitoring of young-of-the-year (YOY) galaxiid distributions and apparent survival across the Broken River catchment was also undertaken. Galaxias vulgaris YOY recruitment was high in trout-free reaches, indicating positive population growth. Galaxias vulgaris was absent from three trout-invaded sites, and the remaining invaded sites had significantly depleted juvenile recruitment. Information-theoretic model selection indicated that trout, rather than habitat, drove recruitment failure. Trout-invaded sites could be divided into "sinks" that retained no YOY galaxiids, indicating no local recruitment, and "pseudosinks," which had very few recruits. Absence of small G. vulgaris at sink sites suggested population maintenance through immigration of adults from sources, whereas pseudosink sites appear capable of self-recruitment at low carrying capacities. Trout-free reaches appear to act as sources in a river network but are susceptible to future invasions by trout. Thus, not only may invasive species cause source-sink metapopulations in native species, but also the potential of refugia for natives (sources) to become future sinks highlights the vulnerability of these metapopulations when invasive predators are the principal demographic driver.

Time and frequency of thiamethoxam application for control of Japanese gall-forming thrips, Ponticulothrips diospyrosi (Thysanoptera: Phlaeothripidae) on persimmon

Ponticulothrips diospyrosi Haga et Okajima has several characteristic features of damage, such as leaf rolling and dotted scars on fruit skin. The objectives of this study were to find out the optimum timing and frequency of insecticide application to reduce this damage. The effect of spraying twice at a 7-day interval before adult immigration was tested. The efficacy of the insecticide was delayed by the favorable microhabitat produced by adults and offspring within damaged leaf. Twice spraying in 2005 was effective in reducing the number of surviving insects and damaged leaves 1 month later. The time of adult immigration was coincident with the growth of persimmon shoots to 2 cm approximately, or the stage of four to five leaves, on April 22. Spraying three times in 2006 was the most effective, starting the first spray at the five to six leaf stage, immediately before immigration, and the second 9 days later (on immigration), and the third after the flowers faded. By using this control regime, no leaves were damaged, and residues of thiamethoxam and its metabolite were trace levelled when they were analysed by HPLC in late October. The growers could obtain the highest portion of marketable fruits, > 99%, yielding an acceptable net income.

Biogeographical origin and varicella risk in the adult immigration population in Catalonia, Spain (2004-2006)

Immigrants to the European Union may have a higher susceptibility to varicella-zoster virus primo-infection than the indigenous population. There is no evidence as yet that this is caused by genetic or social factors. Therefore, susceptibility could be due to a lesser transmission of the virus in their ecosystems of origin. A multicentre observational study was performed from July 2004 to June 2006 in four primary healthcare centres in Catalonia, Spain, monitoring varicella incidences and comparing standardised incidence rates and standardised rate ratios among different populations classified according to their biogeographical origin (holarctic, Asian paleotropical, African paleotropical or neotropical). Overall, 516 varicella cases were recorded. The standardised incidence rates per 1,000 inhabitants per year were: holarctic: 2.17 (95% confidence interval (CI): 1.95-2.39); autochthonous 2.26 (95% CI: 2.03-2.49); immigrants 3.59 (95% CI: 2.92-4.26); neotropical 4.50 (95% CI: 3.28-5.71); non-holarctic 5.38 (95% CI: 4.27-6.14); Asian paleotropical 7.03 (95% CI: 4.77-9.28); and African paleotropical 7.05 (95% CI: 1.12-23.58). The difference to the autochthonous population was greatest in immigrants of neotropical origin (standardised rate ratio = 2.07 (95% CI: 1.61-2.64) or 4.5 excess cases per 1,000 inhabitants per year) and Asian paleotropical origin (standardised rate ratio = 3.24 (95% CI: 2.47-4.11) or 9.6 excess cases per 1,000 inhabitants per year). Biogeographical origin may therefore account for the vulnerability of certain immigrant populations to varicella, in particular those from Asian paleotropical (Indostan and Southeast Asia) and neotropical (South America and the Caribbean) ecosystems. Vaccination of immigrants at high risk (fertile women, healthcare workers) could be recommendable.

Fitting probability models to population dynamics data

Methods for modeling population dynamics in probability using the generalized point process approach are developed. The life history of these populations is such that seasonal reproduction occurs during a short time. Several models are developed and analyzed. Data about two species: colonial spiders ( Stegodyphus dumicola) and a migratory bird (wood thrush, Hylocichla mustelina) are used to estimate model parameters with appropriate log maximum likelihood functions. For the spiders, the model is fitted to provide evolutionary feasible colony size based on maximum likelihood estimates of fecundity and survival data. For the migratory bird species, a maximum likelihood estimates are derived for the fecundity and survival rates of young and adult birds and immigration rate. The presented approach allows computation of quantities of interest such as probability of extinction and average time to extinction.

Are artificial reefs surrogates of natural habitats for corals and fish in Dubai, United Arab Emirates?

Artificial reefs are often promoted as mitigating human impacts in coastal ecosystems and enhancing fisheries; however, evidence supporting their benefits is equivocal. Such structures must be compared with natural reefs in order to assess their performance, but past comparisons typically examined artificial structures that were too small, or were immature, relative to the natural reefs. We compared coral and fish communities on two large (>400,000 m3) and mature (>25 year) artificial reefs with six natural coral patches. Coral cover was higher on artificial reefs (50%) than in natural habitats (31%), but natural coral patches contained higher species richness (29 vs. 20) and coral diversity (H′ = 2.3 vs. 1.8). Multivariate analyses indicated strong differences between coral communities in natural and artificial habitats. Fish communities were sampled seasonally for 1 year. Multivariate fish communities differed significantly among habitat types in the summer and fall, but converged in the winter and spring. Univariate analysis indicated that species richness and abundance were stable throughout the year on natural coral patches but increased significantly in the summer on artificial reefs compared with the winter and spring, explaining the multivariate changes in community structure. The increased summer abundance on artificial reefs was mainly due to adult immigration. Piscivores were much more abundant in the fall than in the winter or spring on artificial reefs, but had low and stable abundance throughout the year in natural habitats. It is likely that the decreased winter and spring abundance of fish on the artificial reefs resulted from both predation and emigration. These results indicate that large artificial reefs can support diverse and abundant coral and fish communities. However, these communities differ structurally and functionally from those in natural habitats, and they should not be considered as replacements for natural coral and fish communities.

Mental health implications of detaining asylum seekers: systematic review

The number of asylum seekers, refugees and internally displaced people worldwide is rising. Western countries are using increasingly restrictive policies, including the detention of asylum seekers, and there is concern that this is harmful. To investigate mental health outcomes among adult, child and adolescent immigration detainees. A systematic review was conducted of studies investigating the impact of immigration detention on the mental health of children, adolescents and adults, identified by a systematic search of databases and a supplementary manual search of references. Ten studies were identified. All reported high levels of mental health problems in detainees. Anxiety, depression and post-traumatic stress disorder were commonly reported, as were self-harm and suicidal ideation. Time in detention was positively associated with severity of distress. There is evidence for an initial improvement in mental health occurring subsequent to release, although longitudinal results have shown that the negative impact of detention persists. This area of research is in its infancy and studies are limited by methodological constraints. Findings consistently report high levels of mental health problems among detainees. There is some evidence to suggest an independent adverse effect of detention on mental health.

カンキツ園におけるチャノキイロアザミウマ成虫の飛来時期と薬剤防除適期の関係

To determine the optimum time for chemical control, I investigated the infestation and damage of citrus fruits by Scirtothrips dorsalis Hood in four experimental plots where insecticide was applied at different times. The peak days of adult immigration into citrus orchards from the 2nd to the 7th generation were predicted by real-time calculation of the total effective temperature in 2000, 2001, and 2002. The four experimental plots were set up as follows: insecticides were applied at 6.6±1.5 days before the peak days, at 1.0±1.7 days before the peak days, at 5.2±2.1 days after the peak days; no insecticides were applied to one plot, which was considered the control plot. In the two plots where the insecticides were applied at 6.6 or 1.0 days before the peak days, the density of S. dorsalis and the rate of damage caused to the fruits were significantly lower than those in the control plot. However, in the plot where insecticides were applied at 5.2 days after the peak days, the density of adults temporally increased and the rate of damage caused to the fruits were higher than in those in the above two plots.