bluuebunny/crossref_metadata_2025 huggingface dataset:
Durability of brown planthopper, Nilaparvata lugens, resistance in rice variety IR64 in greenhouse selection studies
Authors: Alam Syed N. , Cohen Michael B.
Published: October 2003

Colonies of brown planthopper, Nilaparvata lugens (Stål), established from three locations on Luzon Island, Philippines, were selected for adaptation to four rice varieties: IR22 (no major resistance genes), IR26 (Bph1 gene), IR64 (Bph1 and additional moderate resistance from minor genes), and IR72 (Bph3). In each of the first eleven generations, and the fifteenth generation, the fitness of N. lugens from subcolonies reared on each of the varieties was measured with four tests: survival to adult, feeding rate, female weight, and developmental time. In three of the four tests, insects from all three locations showed slower adaptation to IR64 than to IR22, IR26, and IR72. In the fourth test, developmental time, the rate of adaptation on IR64 and IR72 was similar, and both varieties retained a significant level of resistance after 15 generations of selection. However, as measured by survival to adult, feeding rate, and female weight, after 15 generations the fitness on IR64 of N. lugens from two locations no longer differed from those on other varieties. In these two locations, Central Luzon and IRRI, IR64 has been widely grown for 10 years. After 15 generations of selection IR64 remained resistant to insects from Banaue, an isolated location where modern resistant varieties are not grown, as measured by all four tests. Our results demonstrate that the relatively greater durability of brown planthopper resistance in IR64, which has been suspected on the basis of its performance in the field, is also evident under greenhouse conditions in the absence of natural enemies and other mortality factors.
The relative performance of pheromone and light traps in monitoring the seasonal activity of both sexes of the eastern hemlock looper, Lambdina fiscellaria fiscellaria
Authors: Delisle Johanne , West Richard John , Bowers Wade Woodrow
Published: October 2003

The seasonal flight activity of both sexes of the eastern hemlock looper, Lambdina fiscellaria fiscellaria Guenée (Lepidoptera: Geometridae) was studied during two consecutive years in Quebec and Newfoundland, using light (L), pheromone (P) and combined light and pheromone (LP) traps. Moth density significantly affected the performance of the different traps, with P traps being more effective at low than high density. However, P trap catches decreased just prior to the onset of female captures, probably as a result of competition between traps and virgin calling females. Nearly all females caught in L and LP traps were already mated and even the first females caught had laid at least half of their egg complement. In Quebec under warm nights, the pattern of male activity occurred at different times, with peak P catches being later in the scotophase than those of L traps, but overall similar numbers of males were caught in both traps. In contrast, under cool nights, males were caught early in the night in both P and L traps, suggesting a strong competition effect between traps, although more males were caught in P than L traps overall. In Newfoundland, the pattern of male captures in L and P traps was similar at both high and low temperatures, so competition between trap types would always be high. Under these conditions P traps were more effective than L traps. Irrespective of the region, year or temperature, significantly more males were captured in LP, with the effect of L and P being additive. In both regions, females responded similarly to L and LP traps with peak activity occurring early in the night. Captures of females were lower than those of males under cool temperatures, suggesting that the temperature threshold for flight is higher for females. The use of L and P traps simultaneously and/or in combination is discussed in relation to integrated pest management programs and ecological considerations.
Reduction of insect cold‐hardiness using ice‐nucleating active fungi and surfactants
Authors: Lee Marcia R. , Lee Richard E. , Strong Janet M. , Minges Stacey R. , Mugnano John A.
Published: October 2003

The supercooling point (SCP) of an insect model, the lady beetle Hippodamia convergens Guérin‐Menéville (Coleoptera, Coccinellidae) was markedly elevated by treatment with aqueous suspensions of the filamentous, ice nucleation active (INA) fungi Fusarium avenaceum and slightly elevated by Fusarium acuminatum. Addition of the surfactant Tween 80 to the fungal suspensions further reduced the supercooling capacity of adult beetles. When used alone the surfactant Triton X‐100 produced a greater SCP elevation than Tween 20 or Tween 80. The emulsifier gum arabic was ineffective in elevating beetle SCPs when applied alone and when added to INA fungal preparations it decreased their efficacy. Aqueous suspensions of both viable sporulating and viable pleomorphic (a permanent, degenerative, nonsporulating cultural state) forms of both fungal species were more effective in elevating the SCP than killed preparations except for the pleomorphic F. acuminatum suspension in which the killed form was slightly more active. Application of INA fungi applied in combination with surfactants may be useful in the development of methods for the biological control of overwintering freeze‐susceptible insect pests by decreasing their capacity to avoid lethal freezing by supercooling.
Interaction of treatment of both adult and immature Coleoptera with a chitin synthesis inhibitor affects mortality and development time of their progeny
Authors: Elek Jane A.
Published: October 2003

Chitin synthesis inhibitors, like many other insect growth regulating insecticides, do not kill adult insects but cause mortality of the immature stages. Pre‐exposure of adult stored grain Coleoptera, Rhyzopertha dominica (F.) (Bostrichidae) and Sitophilus oryzae (L.) (Curculionidae) and development of their progeny in grain treated with the chitin synthesis inhibitor, chlorfluazuron, influenced the mortality and development rate of the progeny. Hatch rate of eggs from R. dominica adults that had both developed and laid on wheat treated with 0.75 mg kg−1 chlorfluazuron was reduced by almost 50% compared with untreated eggs, with an LC50 of 0.84 mg kg−1. Eggs laid on treated wheat by R. dominica adults that had been exposed only to treated wheat for 2 weeks before oviposition showed greater reduction in hatch: 75% reduction of normal hatch rate at 0.25 mg kg−1 and almost 100% reduction at 2 mg kg−1 chlorfluazuron, with an LC50 of 0.19 mg kg−1 chlorfluazuron. X‐rays were used to monitor the development and mortality of the immature stages of S. oryzae that developed within the wheat grains. Numbers of eggs laid were not affected by chlorfluazuron treatment. The combination of pre‐exposure of adults and chlorfluazuron concentration had an additive effect on mortality of immature S. oryzae. Pre‐exposure of adults caused most mortality in the first three weeks of development (eggs and larvae), whereas development in treated wheat caused mortality from weeks 3 to 8 (pupae and adults); higher concentrations of chlorfluazuron caused higher mortality. Development in wheat treated with 1 mg kg−1 chlorfluazuron caused 12% corrected overall mortality of progeny while pre‐exposure to the same concentration and development in untreated wheat caused 29% corrected mortality. Pre‐exposure combined with development in wheat treated with 1 mg kg−1 caused 30% corrected mortality. Thus, pre‐exposure of adults appears to have a greater effect on mortality of S. oryzae progeny than development of immature stages in treated grain. Development on treated grain had no effect on development rate. Pre‐exposure of adults did not appear to affect the rate of immature development, as assessed by X‐rays, but did slow the emergence of adults, lengthening development time by about 2 days. This significant, additive effect of pre‐exposure of adults on the mortality of their progeny will enhance the toxicity of chitin synthesis inhibitors such as chlorfluazuron, since most adults receive treatment when the immature stages are treated in crops either before they are harvested or in storage. Assessing the proportion of eggs that hatch from pre‐exposed adults would be a simpler bioassay for CSIs.
Intrinsic rate of population increase of the spider mite Tetranychus urticae on the ornamental crop gerbera: intraspecific variation in host plant and herbivore
Authors: Krips O.E. , Witul A. , Willems P.E.L. , Dicke M.
Published: October 2003

Eight cultivars of the ornamental crop Gerbera jamesonii Bolus (Asteraceae) were compared in host plant suitability for the two spotted spider mite Tetranychus urticae Koch (Acarina: Tetranychidae). This was done by determining the intrinsic rate of population increase, rm, of spider mites on leaf discs of plants from each of the cultivars. Large differences in rm values were found, ranging from 0.088/day on cultivar Bianca to 0.242/day on cultivar Sirtaki. This variation in rm was mainly caused by differences in developmental time of the spider mites.

We assessed the performance of spider mites on young and old leaves of the two gerbera cultivars Bianca and Sirtaki. On Sirtaki the spider mites had a shorter developmental time and higher peak oviposition rate on young leaves than on old leaves. However, on Bianca such an effect was not found.

We also determined the performance of two spider mite strains on the resistant gerbera cultivar Bianca. We compared the rm of a strain that had been reared on this cultivar for approximately half a year with the rm of a strain that was reared on bean. The rm of the strain that was reared on cultivar Bianca increased to 0.208/day, which is however still substantially lower than the rm on the susceptible cultivar Sirtaki.
An evaluation of (Z)‐9‐tricosene and food odours for attracting house flies, Musca domestica, to baited targets in deep‐pit poultry units
Authors: Chapman Jason W. , Knapp Jennifer J. , Howse Philip E. , Goulson Dave
Published: October 2003

Field trials investigating the effect of food baits on catches of Musca domestica at toxic targets impregnated with the female sex pheromone, (Z)‐9‐tricosene, were conducted in a caged‐layer deep‐pit poultry unit in southern England. Targets treated with an Alfacron‐sugar mixture and baited with 2.5 g of 40% (Z)‐9‐tricosene beads caught significantly greater numbers of both male and female M. domestica than control targets. Egg and milk‐baited targets were less attractive than controls, while brewers yeast slightly increased the numbers of M. domestica attracted. However, the inclusion of brewers yeast in (Z)‐9‐tricosene‐impregnated targets produced a significant reduction in the number of male M. domestica attracted. Increased female attraction was elicited by baiting the targets with 2‐phenylethanol, at the quantities of 1 mg and 10 mg. However, 2‐phenylethanol had no effect on female attraction when presented in conjunction with (Z)‐9‐tricosene. The implications of these results in relation to the control of M. domestica populations in poultry units are discussed.
Diapause survival and post‐diapause performance in bumblebee queens (Bombus terrestris)
Authors: Beekman M. , van Stratum P. , Lingeman R.
Published: October 2003

Diapause survival and post‐diapause performance (i.e., if a queen starts to lay eggs) of in total 2210 bumblebee queens (Bombus terrestris) were measured under different diapause regimes: 5 temperatures (−5, 0, 5, 10 and 15 °C) in combination with 5 durations of exposure (1, 2, 4, 6 and 8 months).

The results show that weight at the start of diapause determines to a large extent whether a queen will be able to survive diapause. Queens with a wet weight below 0.6 g prior to diapause did not survive, but for those queens exceeding this threshold a higher pre‐ diapause weight did not increase their post‐diapause performance.

There was no effect of temperature on diapause survival; 76% of the variance in survival could be explained by the duration of the treatment. Neither temperature nor duration of exposure had an effect on post‐diapause performance. The preoviposition period of the queens that laid eggs was also determined. The preoviposition period was affected by both temperature and duration of exposure: the preoviposition period decreased with decreasing temperature but also with increasing duration of the treatment.
Settling behaviour and reproductive potential of the green peach aphid Myzus persicae on peach varieties and a related wild Prunus
Authors: Sauge Marie‐Hélène , Kervella Jocelyne , Pascal Thierry
Published: October 2003

Discovery in the late seventies of resistance to the green peach aphid Myzus persicae (Sulzer) (Homoptera: Aphididae) in Prunus species was based on screening in the field or in greenhouses with natural aphid populations. Here, we assess the impact of these wild and domesticated peach trees on the behaviour, development, reproductive performance and demography of cloned aphids under controlled light and temperature. Four peach varieties, i.e., Rubira, Weeping Flower Peach, Summergrand and Malo konare and the clone P1908 of the related species Prunus davidiana were tested against the highly susceptible cultivar GF305. Besides a variability in the performance of aphids among experiments, our results showed that (i) distinct mechanisms were involved in the sources of resistance studied and (ii) the ranking of the genotypes on their resistance/susceptibility status remained roughly stable throughout the experiments. Observations on the settling behaviour of first instar nymphs demonstrated antixenosis components in the resistance conferred by Rubira and Weeping Flower Peach. Nymphs began to leave the plants after a short exposure (19–21 h) and no aphid was left after 4 days. Nymphal mortality remained rather low (16%) compared to the repellent effect on aphids of both genotypes. Nymphs disappeared from Weeping Flower Peach significantly earlier than from Rubira. Summergrand, Malo konare and P. davidiana clone P1908 were accepted as host plants by aphids. On P. davidiana, decreased fecundity and intrinsic rate of natural increase (rm= 0.20, averaged on all experiments) were clear expression of antibiosis. In addition, the mean length of the mature embryos within the gonads of the females on the day of adult moult was negatively correlated with the total number of embryos, providing evidence that aphids on this genotype lacked sufficient ressources to be directed both towards production and growth of embryos. Compared to the most susceptible cultivar GF305 (rm= 0.36), Summergrand (rm= 0.26) and Malo konare (rm= 0.28) had, to a lesser extent, a negative impact on nymph production and rate of increase.
Hyperparasitism by an exotic autoparasitoid: secondary host selection and the window of vulnerability of conspecific and native heterospecific hosts
Authors: Hunter Martha S. , Kelly Suzanne E.
Published: October 2003

Encarsia transvena is an ‘autoparasitoid’ in the hymenopteran family Aphelinidae. In this species, female eggs are laid in whitefly nymphs. Male eggs are laid externally on immature parasitoids enclosed within the whitefly integument, either their own species, or other primary parasitoids. We explored parasitism by E. transvena of conspecific female immatures and those of a native primary parasitoid, Eretmocerus eremicus, in laboratory experiments. In the first experiment, female E. transvena were offered different combinations of two stages of E. transvena (late larvae – prepupae (ET2), and early pupae (ET3)), and one stage of E. eremicus (prepupae – early pupae (EE2)) in paired choice tests. The results indicated very little parasitism of ET3 relative to the host it was paired with, either EE2 or ET2. However, when EE2 was offered with ET2, there was no statistically significant difference in parasitism. In a no‐choice experiment in which oviposition patterns and male progeny development were examined in four stages of both species of wasp, clear differences were observed between the host species. Only one stage of E. transvena (ET2) was parasitized and supported development of male E. transvena to any significant degree. In contrast, in E. eremicus, EE2, EE3 (red‐eyed pupae), and EE4 (late pupae) were all parasitized, and male E. transvena emerged from all three stages, although fewer males emerged from EE4. In both species, wasp larvae that were still enclosed within the wet whitefly remains (ET1 and EE1) were parasitized at a very low rate. Lastly, an experiment that determined the length of the later developmental stages of E. transvena and E. eremicus suggested that the duration of the period in which E. transvena is susceptible to parasitism by conspecific females is less than half the period of susceptibility of E. eremicus. These results taken together suggest the potential for interference of E. eremicus by E. transvena, but other factors not examined here may also influence the outcome of interactions in the field.
Eggsac development rates and phenology of agrobiont linyphiid spiders in relation to temperature
Authors: Thorbek P. , Sunderland K.D. , Topping C.J.
Published: October 2003

Spider densities are often low after winter in annual crops, and crop management decimates spider populations several times per year. Population recovery rates and phenology depend on reproductive and development rates, which in turn are driven largely by temperature. We aimed to quantify the relationships between eggsac development rates and temperature in order to understand the relative value of different linyphiid species for the biological control of agricultural pests. Female adults of nine linyphiid species were collected from winter wheat in the UK over 3 years; Bathyphantes gracilis (Blackwall), Erigone atra (Blackwall), Erigone dentipalpis (Wider), Erigone promiscua O.P.‐Cambridge), Tenuiphantes tenuis (Blackwall) [formerly Lepthyphantes tenuis (Blackwall)], Meioneta rurestris (C.L. Koch), Oedothorax apicatus (Blackwall), Oedothorax fuscus (Blackwall), and Oedothorax retusus (Westring). These are agrobiont species that are dominant in agroecosystems. We tested how well development in the field can be predicted on the basis of laboratory experiments. We also built a simple phenology simulation model to test whether spider phenology in the field can be predicted by a general knowledge of the relationship between temperature and development rate. The relationships between temperature and development rates of eggsacs were not linear as described by a day‐degree model, but exponential as described by a biophysical model. Duration of the eggsac development period in the field was predicted accurately from laboratory experiments. We only found minor differences between development thresholds of eggsacs at constant temperatures compared with fluctuating temperatures. The phenology model predicted the phenology of L. tenuis and E. atra well, but the number of generations predicted for O. fuscus was not realised in the field. This suggests that development of this species may be affected by factors other than temperature. The methods used here could also be applied to other natural enemies, to determine whether their thermal biology is conducive to a role as biocontrol agents in disturbed agricultural systems.
Trap cropping to control Delia radicum populations in cruciferous crops: first results and future applications
Authors: Rousse P. , Fournet S. , Porteneuve C. , Brunel E.
Published: October 2003

This study evaluates the efficacy of a new approach to the control of Delia radicum populations. We suggest associating the primary crop with a trap crop that is expected to be more attractive to D. radicum females and to attract and sustain their natural enemies such as Aleochara bilineata and A. bipustulata. Various cruciferous species were compared in terms of their preference for adult D. radicum females, and performance, as estimated by larval survival. Laboratory results were complemented by field experiments in which the selected trap crops were associated with broccoli plants. The following results were obtained. Of the six different cruciferous plant species tested, Delia radicum females showed a strong preference for Chinese cabbage, with turnip also being attractive. Following the laboratory results, turnip was chosen as a trap crop because it was easier to cultivate and presented good preference and performance. In the field experiments, Aleochara adults were present in higher numbers in plots associated with turnips than in pure broccoli plots. The presence of Aleochara adults in plots with turnips improved plant protection; as fewer broccoli plants were attacked, the attacked plants were less severely damaged, and more D. radicum pupae were parasitised than in pure broccoli plots. Delia radicum females did not lay fewer eggs on broccoli plants associated with turnips. Moreover, protection and parasitism were more effective in the rows closest to the central row of turnips, suggesting that Aleochara adults limit their activity to its immediate vicinity.
Effect of optical brighteners on the insecticidal activity of a nucleopolyhedrovirus in three instars of Spodoptera frugiperda
Authors: Martínez Ana‐Mabel , Simón Oihane , Williams Trevor , Caballero Primitivo
Published: October 2003

Certain optical brighteners are effective UV protectants, and can improve the insecticidal activity of baculoviruses. We evaluated the effect of 10 optical brighteners, from four chemically different groups, on the insecticidal activity of a nucleopolyhedrovirus (SfMNPV) in third instar Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae). The most effective optical brighteners were Blankophor BBH and Calcofluor M2R, both of which are stilbenes. The distyryl‐biphenyl derivative, Tinopal CBS, had no effect, whereas the stilbenes, Blankophor CLE and Leucophor SAC and the styryl‐benzenic derivative, Blankophor ER, resulted in a decrease in virus induced mortality compared to larvae infected with SfMNPV alone. Mixtures of SfMNPV + 0.1% Calcofluor M2R had relative potencies of 2.7, 6.5, and 61.6 in the second, third, and fourth instars, respectively. The mean time to death differed with instar, but was not affected by the addition of 0.1% Calcofluor M2R. Analysis of published studies indicated that the concentration of Calcofluor M2R‐related stilbenes was positively correlated with the relative potency observed in mixtures with homologous NPVs. The average magnitude of optical brightener activity did not differ significantly between early instars of 10 species of Lepidoptera. We conclude that virus formulations containing optical brighteners may be valuable for control of late instar lepidopteran pests.
Effect of expected offspring survival probability on host selection in a solitary parasitoid
Authors: Goubault Marlène , Plantegenest Manuel , Poinsot Denis , Cortesero Anne Marie
Published: October 2003

Optimal Foraging Theory predicts that parasitoid females should optimize their host selection to maximize their lifetime fitness gain and parasitize the most profitable hosts. In particular, in solitary parasitoids, females should avoid superparasitism, at least when sufficient unparasitized hosts are available. However, when unparasitized hosts are scarce, they should prefer, among already parasitized hosts, those that provide the best survival probability to their progeny, which depends on the age and the developmental stage of the first parasitoid.

To test this hypothesis in a solitary ectoparasitoid, Pachycrepoideus vindemmiae Rondani (Hymenoptera: Pteromalidae), we first assessed the survival probability of a second parasitoid according to the time elapsed since initial parasitism. We then analyzed the female selection behavior in patches containing a mixture of hosts parasitized over various time intervals.

Our results showed that the older the opponent larva was, the lower the survival probability of the second parasitoid was. However, when the first individual had reached the prepupal stage, both individuals could complete their development. At this stage, the survival probability of the second parasitoid was surprisingly high but such individuals were reduced in size.

Our study also showed that host acceptance by females was strongly correlated with the survival probability of their progeny when the first parasitoid was from 0 to less than 10 days‐old. When the first parasitoid had reached the prepupal stage, females usually rejected these hosts, although the survival probability of the offspring was quite high. This discordance between female host selection behavior and progeny survival probability is discussed.
Effects of an optical brightener and an abrasive on iridescent virus infection and development of Aedes aegypti
Authors: Marina Carlos F. , Arredondo‐Jiménez Juan I. , Ibarra Jorge E. , Fernández‐Salas Ildefonso , Williams Trevor
Published: October 2003

The insecticidal properties of certain entomopathogenic viruses can be greatly improved in mixtures with substances that affect the integrity of the insect peritrophic membrane, particularly optical brighteners. We aimed to determine the effect of an optical brightener, Blankophor BBH, and an abrasive compound, silicon carbide, alone and in mixtures, on the prevalence of patent and covert infection of Aedes aegypti (L.) (Diptera: Culicidae) by Invertebrate iridescent virus 6 (IIV‐6) (Iridoviridae). The prevalence of patent infection by IIV‐6 was < 1.5% in all treatments involving virus. Contrary to predictions, there were significantly fewer patent infections in virus treatments involving Blankophor with or without silicon carbide compared with controls. Covert infection of adults detected by insect bioassay was between 6.7 and 12.2%, although no significant differences were observed between treatments. Exposure to IIV‐6 alone or silicon carbide alone did not significantly increase larval mortality compared to the controls, whereas exposure to Blankophor alone, or in any combination with IIV‐6 or silicon carbide, clearly increased larval mortality. These effects did not carry‐over to the pupal stage. Adult females emerged ∼1.5 days later than males. Compared to control insects, female development rate was extended by 11.4 and 12.6% in the treatments involving IIV‐6 alone and silicon carbide alone, respectively. The sex ratio at adult emergence did not differ significantly between control insects and those of other treatments. These results support the hypothesis that the gut is unlikely to represent the principal point of infection of mosquito larvae by iridescent viruses.
Surgery for Secondary Hyperparathyroidism in Patients Undergoing Dialysis
Authors: Garcia‐Pallares Marta , Bernaldez Ricardo , Sanchez M. Carmen , Gavilán Javier
Published: October 2003

Despite recent advances in the diagnosis and therapy of patients with chronic renal failure and secondary hyperparathyroidism (HPT), 5% of these patients may need parathyroidectomy. The purpose of this article is to present our experience with parathyroid surgery in 30 patients with chronic renal failure at “La Paz” University Hospital, analyzing the clinical and biochemical evolution after surgery as well as the recurrence rate. In the first month after surgery, calcium, parathyroid hormone, phosphorus, and alkaline phosphatase levels, as well as bone pain and pruritus, all decreased significantly. Within the first postoperative year, 24 patients remained asymptomatic, and no recurrent secondary HPT was detected. Within the second year after surgery, 15 patients were asymptomatic, and 3 patients showed a recurrence. According to these results, parathyroidectomy is an appropriate surgical procedure for patients with severe overt secondary HPT.
Freud and Jung: an incomplete encounter1
Authors: McFarland Solomon Hester
Published: October 2003

Abstract:  The author discusses the bases of the close, personal and professional relationship between Freud and Jung, and conjectures that the eventual schism between them was the result of the different profound psychological needs that each had for the  other. Because of his identification with the psychoanalytic enquiry, particularly as it was based in large measure on his own self analysis, Freud looked to Jung as a collaborator who would not deviate from the principles at the basis of psychoanalysis, seeking psychoanalysis’ acceptance within the established scientific community. From Jung's point of view, Freud fulfilled the role of a respected father figure who, Jung hoped, would grant him the autonomy and freedom to pursue his own scientific enquiry, based on Freud's ideas, but which he would revise according to his own researches. These led Jung to certain revisions and additions, such as the nature and function of the libido, the broadening of the idea of the complex (as in the Oedipus complex) to include a number of universal, archetypal themes, and the elaboration of the concept of the self.

During the years of their relationship, they shared a mutual psychological support which was deeply important to each, based on reciprocal love and respect but also on a fantasy that each would be able to supply to the other a key capacity that the other lacked. Jung was able to offer important scientific verifications of a number of psychoanalytic notions via the Word Association Test, such as the concept of repression, of the complex, including the Oedipus complex, and the proof of the existence of the unconscious. However, neither could supply to the other what each looked for in the other at the psychological level.

The final breakdown and rupture in their relationship was caused by their theoretical differences and by the fact that they became bitter competitors in a race to publish treatises on the nature and origins of spirituality and religion. It has left in its wake the implicit traces of discord and misapprehension which have characterized much of subsequent professional relationships between the two traditions.
Attending to the General Interest: New Mechanisms for Mediating between the Individual, Collective and General Interest in Québec
Authors: Bernier Luc , Bouchard Marie , Lévesque Benoît
Published: October 2003

We develop an approach to studying new business governance models and we illustrate how these models take the general interest into account. We outline the main prevailing trends, in the context of the Québec model of development, and discuss the new conceptions of the state and of its role in governance. As a result of this, organizations and institutions are playing a new role in the pursuit of the general interest, which we examine using the ‘Solidarity Fund’ of the Fédération des travailleurs et travailleuses du Québec (FTQ). We suggest that a partnership‐based governance model may help support the emergence of a new mixed economy that weds the general interest with individual and collective interests in an original way.
Earnings and Schooling of Cooperative Managers
Authors: Pestana Barros Carlos , Gomes Santos J.C.
Published: October 2003

Abstract This paper estimates econometrically the economic return on schooling among Portuguese cooperative managers, based on a survey carried out in 1999. The main findings indicate that the rate of return is in line with previous published research. The results also indicate that in this sector, the return on education does not depend on the dimensions of the cooperative in which the individual works.
Residual Claims in Co‐operatives: Design Issues
Authors: Srinivasan R. , Phansalkar S.J.
Published: October 2003

This paper examines issues in the design of a co‐operative member's contractual relationship with the other agents (including the remaining members) using organizational economics. The paper assumes that the central defining characteristic of a co‐op is the residual claim specification. Agency theory identifies certain inherent problems of the co‐op form, the horizon problem, common property problem, and non‐transferability. Non‐transferability both reduces the incentive to monitor and imposes limits on portfolio diversification. This paper argues that features such as claim incompleteness and non‐transferability are not inherent to the co‐op but may be transaction‐cost economizing. The paper also argues that the pre‐emptive payoff feature by which the residual claimants (the co‐op members) also become fixed payoff agents can affect the risk of other agents, and is an important determinant of co‐op risk. A co‐op may have more than one potential residual claim base. Five generic design choices are available for handling possible multiple claim bases: battleground, pre‐specified allocation, limited return, alignment, and fixed payoff. The paper uses the design of residual claims in sugar co‐ops to show how a co‐op can partly overcome some of the problems identified by agency theory. This illustration ties together the issues of claim incompleteness and non‐transferability, pre‐emptive payoff, and multiple claim bases.
Production et rationalisation des intermédiaires financiers: Leçons à tirer de l’expérience des Caisses Populaires Acadiennes
Authors: Leclerc André , Fortin Mario
Published: October 2003

Resume

Nous mesurons à l’aide du DEA (Data Envelopment Analysis) l’efficacité des caisses populaires acadiennes en utilisant la valeur des produits d’intermédiation ainsi que le nombre de transactions réalisées par chaque caisse entre 1997 et 2000, au moment où un important programme de fusions et de réingénierie financière était mis en place. Cette analyse permet d’établir plusieurs résultats. Tout d’abord, l’inclusion des produits transactionnels réduit environ de moitié l’inefficacité technique et économique par rapport à l’inefficacité obtenue lorsque l’output des caisses est limité seulement aux produits transactionnels. Un algorithme d’auto‐amorçage permet de vérifier que ce résultat est statistiquement significatif. Ensuite, nous montrons que le programme de fusions a touché surtout les caisses moins efficaces et a permis d’augmenter de façon importante leur efficacité grâce à une baisse du nombre d’employés en équivalent temps complet. Finalement, nous montrons que d’importants progrès technologiques ont été réalisés entre 1997 et 2000 en raison de l’accroissement du nombre de transactions informatisées. Des gains additionnels de productivité ont été rendus possible grâce à l’amélioration de l’efficacité des caisses ayant participéà une fusion tandis que les caisses n’ayant pas fusionné, bien que plus efficaces au départ que les autres, n’ont pas réalisé de gains d’efficacité.
The Role of United Charities in Fundraising: The Case of Singapore
Authors: Chua Vincent C.H. , Ming Wong Chung
Published: October 2003

Abstract: Theory suggests that a united charity helps to economize on fundraising costs by reducing competition for donations among member charities. However, donors often cannot control the allocation of their donations, and charities may dislike the monitoring of their activities. This paper examines these and other issues relating to the Community Chest of Singapore. The results, based on analysis of financial positions and fundraising costs of a large number of charities, suggest that the Community Chest does possess important fundraising advantages. Thus charities in financial difficulties or in need of funds for additional programs tend to seek membership. However, organizations that value their autonomy and independence, and that are able to achieve low fundraising costs tend to remain as non‐members. Thus a monopoly agency raising funds for all charities in the future is unlikely in the case of Singapore.
Monitoring for Increases in Process Variance
Authors: Sparks Ross
Published: October 2003

Process variation is made up of a wandering mean (signal) and the variation of the process around this wandering mean (noise). The paper advocates a new process monitoring method that uses various forms of moving variances to signal changes in process noise or variance. The monitoring plans are compared to the current approaches in terms of their average run length properties.
Models with Errors due to Misreported Measurements
Authors: Henderson Brent , Jarrett Richard
Published: October 2003

Measurement error and misclassification models feature prominently in the literature. This paper describes misreporting error, which can be considered to fall somewhere between these two broad types of model.

Misreporting is concerned with situations where a continuous random variable X is measured with error and only reported as the discrete random variable Z. Data grouping or rounding are the simplest examples of this, but more generally X may be reported as a value z of Z which refers to a different interval from the one in which X lies. The paper discusses a method for handling misreported data and draws links with measurement error and misclassification models.

A motivating example is considered from a prenatal Down's syndrome screening, where the gestational age at which mothers present for screening is a true continuous variable but is misreported because it is only ever observed as a discrete whole number of weeks which may in fact be in error. The implications this misreporting might have for the screening are investigated.
Non‐Parametric Testing of Conditional Variance Functions in Time Series
Authors: Laïb Naâmane
Published: October 2003

This paper proposes a non‐parametric test for examining hypotheses about variance functions under stationarity and ergodicity conditions. Special cases of nonlinear time series models are studied, and it is found that under mild conditions the test is consistent. Its power is examined in a simulation study.
A Lack‐of‐Fit Test for Heteroscedastic Regression Models via Cosine‐Series Smoothers
Authors: Li Chin‐Shang
Published: October 2003

In this paper, a test is derived to assess the validity of heteroscedastic nonlinear regression models by a non‐parametric cosine regression method. For order selection, the paper proposes a data‐driven method that uses the parametric null model optimal order. This method yields a test that is asymptotically normally distributed under the null hypothesis and is consistent against any fixed alternative. Simulation studies that test the lack of fit of a generalized linear model are conducted to compare the performance of the proposed test with that of an existing non‐parametric kernel test. A dataset of esterase levels is used to demonstrate the proposed method in practice.
Material Geographies and Postcolonialism
Authors: McEwan Cheryl
Published: October 2003

While postcolonial studies have inspired new ideas, a new language and a new theoretical inflection for a wide range of teaching and research in human geography, there have been few sustained discussions about what might constitute a postcolonial geography. This paper attempts to deal with this absence by exploring the possibilities of material geographies of postcolonialism. It suggests that geographers are particularly well placed to respond to criticisms of postcolonialism as remaining overwhelmingly textual, cultural and/or historical in focus by contributing towards a productive engagement between postcolonialism and the material realities of global inequalities, and towards a revivified political and ethical project. It explores how particular tactics might inform postcolonial methodologies within geography and makes some tentative suggestions on what a postcolonial political praxis might look like.
Collaboration Across Borders: Moving Beyond Positionality
Authors: Nagar Richa , Ali Frah
Published: October 2003

Discussions about collaborative spaces in postcolonial feminist and geographical analyses have often hinged on questions of positionality, reflexivity and identity, largely in relation to the politics of representation. Such approaches have often led to an impasse, especially in fieldwork‐based feminist research, where reflexivity has mainly focused on examining the identities of the individual researcher rather than on the ways in which those identities intersect with institutional, geopolitical and material aspects of their positionality. This kind of identity‐based reflexivity does not distinguish systematically between the ethical, ontological and epistemological aspects of fieldwork dilemmas; it also fails to adequately address how our ability to align our theoretical priorities with the concerns of communities whose struggles we want to advance is connected to the opportunities, constraints and values embedded in our academic institutions. This article takes this discussion forward by arguing for a postcolonial and transnational feminist praxis that focuses explicitly and deliberately on (a) conceptualising and implementing collaborative efforts that insist on crossing multiple and difficult borders; (b) the sites, strategies and skills deployed to produce such collaborations; and (c) the specific processes through which such collaborations can find their form, content and meaning. To ground this discussion, I draw upon two collaborative initiatives that I have begun recently in the state of Uttar Pradesh, north India.
American Empire and Globalisation: Postcolonial Speculations on Neocolonial Enframing
Authors: Sparke Matthew
Published: October 2003

In this paper, I examine the ways in which widely reproduced discourses and theories about globalisation elide American dominance. Drawing on arguments about enframing made by Timothy Mitchell in his postcolonial analysis of Egypt's colonisation, I suggest that one significant cause of this elision relates to a commonplace imagined geography of globalisation that enframes economic interdependency as constitutive of a smooth, decentred and somehow levelled global space of flows. I argue that this imagined geography is structured into dominant political‐economic forms of practice and governance, and that in this way it both enables and elides American dominance. Notwithstanding this force in the world, and notwithstanding the tendency of many commentators on globalisation to ignore American dominance, recent events have made such elisions more difficult. I therefore suggest that we need to do more to theorise how American dominance is interwoven with economic globalisation.
Identifying Children's Peer Social Networks in School Classrooms: Links Between Peer Reports and Observed Interactions
Authors: Gest Scott D. , Farmer Thomas W. , Cairns Beverley D. , Xie Hongling
Published: October 2003

Links between peer reports of social cluster membership and observed classroom interactions were examined in a sample of 72 children in 4th grade and 7th grade. All participating children in each classroom identified as many social clusters in the classroom as they could recall. Using the social‐cognitive map (SCM) procedure, these individual reports were aggregated to summarize the number of times a given child was nominated as being in the same social cluster as each of his or her classmates (i.e., a co‐nomination profile) and to identify the classmates in each child's social cluster. Extensive classroom observations allowed for a parallel summary of the number of times a given child was observed to interact with each of his or her classmates (i.e., an interaction profile). Results indicated that correlations between conomination profiles and interaction profiles were positive and statistically reliable. Children were observed to interact with members of their SCM‐identified social cluster at a rate four times higher than with other same‐sex classmates. These effects did not vary reliably by grade, sex or aggressive risk status.
Relational Aggression, Relational Victimization, and Language Development in Preschoolers
Authors: Bonica Cheryl , Arnold David H. , Fisher Paige H. , Zeljo Alexandra , Yershova Kseniya
Published: October 2003

We investigated language development, relational aggression, and relational victimization in ethnically, socioeconomically diverse preschoolers. Relational aggression was positively related to language development. Girls were more relationally aggressive than boys, and higher‐socioeconomic status (SES) children were more relationally aggressive and victimized than lower‐SES children. Neither gender nor SES conclusively moderated the relation between language and relational aggression, though some findings suggest the possibility of stronger relations among boys and lower‐SES children. Teachers agreed on ratings of relational aggression and relational victimization to a moderate extent.
The Effect of Gender Context on Children's Social Behavior in a Limited Resource Situation: An Observational Study
Authors: Green Vanessa A. , Cillessen Antonius H. N. , Berthelsen Donna , Irving Kym , Catherwood Di
Published: October 2003

Knowing when to compete and when to cooperate to maximize opportunities for equal access to activities and materials in groups is critical to children's social and cognitive development. The present study examined the individual (gender, social competence) and contextual factors (gender context) that may determine why some children are more successful than others. One hundred and fifty‐six children (M age=6.5 years) were divided into 39 groups of four and videotaped while engaged in a task that required them to cooperate in order to view cartoons. Children within all groups were unfamiliar to one another. Groups varied in gender composition (all girls, all boys, or mixed‐sex) and social competence (high vs. low). Group composition by gender interaction effects were found. Girls were most successful at gaining viewing time in same‐sex groups, and least successful in mixed‐sex groups. Conversely, boys were least successful in same‐sex groups and most successful in mixed‐sex groups. Similar results were also found at the group level of analysis; however, the way in which the resources were distributed differed as a function of group type. Same‐sex girl groups were inequitable but efficient whereas same‐sex boy groups were more equitable than mixed groups but inefficient compared to same‐sex girl groups. Social competence did not influence children's behavior. The findings from the present study highlight the effect of gender context on cooperation and competition and the relevance of adopting an unfamiliar peer paradigm when investigating children's social behavior.
The Fine Structure of Cyclic Agree
Authors: Rezac Milan
Published: October 2003

Abstract.This paper argues for an implementation of cyclicity through a natural economy condition, the Earliness Principle (EP), which requires a feature to be eliminated as early as possible. EP predicts that the search space for feature checking should increase throughout the derivation with the growth of the phrase marker. This prediction is shown to be manifested in “agreement displacement,” where agreement morphology under certain conditions cross‐references a noncanonical argument. Agreement displacement shows that (ϕ‐features of a head may seek a DP outside the complement of that head, after the cycle on which search exhausts the complement, as predicted by EP. A detailed look at Basque ergative displacement, which differentially affects person and number, leads to the conclusion that agreement may happen only once per interpretable feature. The blocking of multiple Agree relationships is implemented as a locality effect, based on the construal of Case as a functional category introduced by Agree.
Negative Inversion as Nonmovement
Authors: Sobin Nicholas
Published: October 2003

Abstract. In a substantial body of work, negative inversion (NT) is argued to be movement of a verb toward a negative expression and out of IP/AgrP. NI constructions are claimed to work in parallel with w/h‐questions. This paper offers an AgrP‐internal account of NI constructions, which is consistent with positing a simpler CP layer. I argue here that there is no attraction of the verb to the negative expression (i.e., no Negative Criterion) and that the apparent inversion is impeded movement where the elements involved (verb and subject) fail to arrive at the normal declarative surface positions. It is demonstrated that such an analysis accounts straightforwardly for a variety of phenomena that require complexity or dual analysis in IP/AgrP‐external approaches to NI.