Claremont Colleges

Journal Article Chapman and Hall Get access Anne Lohrli Anne Lohrli Claremont, California Search for other works by this author on: Oxford Academic Google Scholar Notes and Queries, Volume 32, Issue 3, September 1985, Pages 377–378, https://doi.org/10.1093/notesj/32.3.377-a Published: 01 September 1985

Abstract Aim We surveyed the empirical literature to determine how well six diversity hypotheses account for spatial patterns in species richness across varying scales of grain and extent. Location Worldwide. Methods We identified 393 analyses (‘cases’) in 297 publications meeting our criteria. These criteria included the requirement that more than one diversity hypothesis was tested for its relationship with species richness. We grouped variables representing the hypotheses into the following ‘correlate types’: climate/productivity, environmental heterogeneity, edaphics/nutrients, area, biotic interactions and dispersal/history (colonization limitation or other historical or evolutionary effect). For each case we determined the ‘primary’ variable: the one most strongly correlated with taxon richness. We defined ‘primacy’ as the proportion of cases in which each correlate type was represented by the primary variable, relative to the number of times it was studied. We tested for differences in both primacy and mean coefficient of determination of the primary variable between the hypotheses and between categories of five grouping variables: grain, extent, taxon (animal vs. plant), habitat medium (land vs. water) and insularity (insular vs. connected). Results Climate/productivity had the highest overall primacy, and environmental heterogeneity and dispersal/history had the lowest. Primacy of climate/productivity was much higher in large‐grain and large‐extent studies than at smaller scales. It was also higher on land than in water, and much higher in connected systems than in insular ones. For other hypotheses, differences were less pronounced. Throughout, studies on plants and animals showed similar patterns. Coefficients of determination of the primary variables differed little between hypotheses and across the grouping variables, the strongest effects being low means in the smallest grain class and for edaphics/nutrients variables, and a higher mean for water than for land in connected systems but vice versa in insular systems. We highlight areas of data deficiency. Main conclusions Our results support the notion that climate and productivity play an important role in determining species richness at large scales, particularly for non‐insular, terrestrial habitats. At smaller extents and grain sizes, the primacy of the different types of correlates appears to differ little from null expectation. In our analysis, dispersal/history is rarely the best correlate of species richness, but this may reflect the difficulty of incorporating historical factors into regression models, and the collinearity between past and current climates. Our findings are consistent with the view that climate determines the capacity for species richness. However, its influence is less evident at smaller spatial scales, probably because (1) studies small in extent tend to sample little climatic range, and (2) at large grains some other influences on richness tend to vary mainly within the sampling unit.

Ruthenium-based olefin metathesis catalysts, known for their functional group tolerance and broad applicability in organic synthesis and polymer science, continue to evolve as an enabling technology in these areas. A discussion of recent mechanistic investigations is followed by an overview of selected applications.

This analysis of how the ability to participate in society online affects political and economic opportunity finds that technology use matters in wages and income and civic participation and voting. Just as education has promoted democracy and economic growth, the Internet has the potential to benefit society as a whole. Digital citizenship, or the ability to participate in society online, promotes social inclusion. But statistics show that significant segments of the population are still excluded from digital citizenship. The authors of this book define digital citizens as those who are online daily. By focusing on frequent use, they reconceptualize debates about the digital divide to include both the means and the skills to participate online. They offer new evidence (drawn from recent national opinion surveys and Current Population Surveys) that technology use matters for wages and income, and for civic engagement and voting. Digital Citizenship examines three aspects of participation in society online: economic opportunity, democratic participation, and inclusion in prevailing forms of communication. The authors find that Internet use at work increases wages, with less-educated and minority workers receiving the greatest benefit, and that Internet use is significantly related to political participation, especially among the young. The authors examine in detail the gaps in technological access among minorities and the poor and predict that this digital inequality is not likely to disappear in the near future. Public policy, they argue, must address educational and technological disparities if we are to achieve full participation and citizenship in the twenty-first century.

(Uploaded by Plazi for the Bat Literature Project) No abstract provided.

Although some organisms have moved to higher elevations and latitudes in response to recent climate change, there is little consensus regarding the capacity of different species to track rapid climate change via range shifts. Understanding species' abilities to shift ranges has important implications for assessing extinction risk and predicting future community structure. At an expanding front, colonization rates are determined jointly by rates of reproduction and dispersal. In addition, establishment of viable populations requires that individuals find suitable resources in novel habitats. Thus, species with greater dispersal ability, reproductive rate and ecological generalization should be more likely to expand into new regions under climate change. Here, we assess current evidence for the relationship between leading-edge range shifts and species' traits. We found expected relationships for several datasets, including diet breadth in North American Passeriformes and egg-laying habitat in British Odonata. However, models generally had low explanatory power. Thus, even statistically and biologically meaningful relationships are unlikely to be of predictive utility for conservation and management. Trait-based range shift forecasts face several challenges, including quantifying relevant natural history variation across large numbers of species and coupling these data with extrinsic factors such as habitat fragmentation and availability.

Lizard life-history characteristics vary widely among species and populations. Most authors seek adaptive or phylogenetic explanations for life-history patterns, which are usually presumed to reflect genetic differences. However, lizard life histories are often phenotypically plastic, varying in response to temperature, food availability, and other environmental factors. Despite the importance of temperature to lizard ecology and physiology, its effects on life histories have received relatively little attention. We present a theoretical model predicting the proximate consequences of the thermal environment for lizard life histories. Temperature, by affecting activity times, can cause variation in annual survival rate and fecundity, leading to a negative correlation between survival rate and fecundity among populations in different thermal environments. Thus, physiological and evolutionary models predict the same qualitative pattern of life-history variation in lizards. We tested our model with published life-history data from field studies of the lizard Sceloporus undulatus, using climate and geographical data to reconstruct estimated annual activity seasons. Among populations, annual activity times were negatively correlated with annual survival rate and positively correlated with annual fecundity. Proximate effects of temperature may confound comparative analyses of lizard life-history variation and should be included in future evolutionary models.

Recent work indicates that people hold a variety of self-serving biases, be-lieving themselves more capable than they are in fact. Such biases, if ex-tended to the organizational level, would lead to overly optimistic planning for the future. This prediction was tested with two groups of management students and with a sample of corporate presidents. The management students consistently overestimated their abilities; in a marketing exercise, they like-wise indicated that a hypothetical firm, of which they were sales managers, would quickly overtake established competition. The executive sample also predicted inordinate success; the latter group, however, moderated projections somewhat if prior planning experience had been unsatisfactory. The impor-tance of managerial myopia to considerations of marketing, resource manage-ment, and demarketing is discussed. During the past decade, a number of re-searchers have noted that individuals often view themselves more favorably than seems

Journal Article Capital Mobility and State Autonomy: Toward a Structural Theory of International Monetary Relations Get access David M. Andrews David M. Andrews Scripps College, the Claremont Colleges Search for other works by this author on: Oxford Academic Google Scholar International Studies Quarterly, Volume 38, Issue 2, June 1994, Pages 193–218, https://doi.org/10.2307/2600975 Published: 01 June 1994

The importance of effective training in ensuring the success of end-user computing (EUC) has been emphasized by several researchers in information systems. A vast amount of evidence from research in related areas such as educational psychology suggests that individual differences, such as learning style, may affect users learning about a new EUC software package. This article reports the findings of a series of studies that examine the influence of a novice’s learning style in learning typical EUC tools such as spreadsheets and electronic mail. A consistent pattern of findings emerges that indicates that learning modes is an important predictor of learning performance, both by itself and in interaction with training methods. The findings suggest that in the design of training, it is essential to match training methods to individual difference variables. Based on these findings, guidelines are recommended for IS professionals involved in EUC training and further research directions are discussed.

There has been considerable interest in recent years in the question of issue linkages in international negotiations. What is significant about discussions of linkages in the present era is the stress put on making trade-offs explicit among issues. Most of the highly publicized cases of proposed issue linkages appear to have been motivated by attempts of individual countries or groups of countries to extend their dominant bargaining or veto power in one particular issue area into other areas so as to achieve maximum advantage from their whole array of international interactions. The existence of an additional rationale for linkage that relies upon mutual interest has important implications. Drawing on the economic theory of exchange, the use of issue linkages to facilitate the completion of a greater number of mutually beneficial agreements among nations is considered.

Life: Its Origins and Evolution - PART ONE: THE CELL - Life and Chemistry: Small Molecules - Life and Chemistry: Large Molecules - Cells: The Basic Units of Life - Cellular Membranes - Energy, Enzymes, and Metabolism - Cellular Pathways that Harvest Chemical Energy - Photosynthesis: Energy from the Sun - PART TWO: INFORMATION AND HEREDITY - Chromosomes, the Cell Cycle, and Cell Division - Transmission Genetics: Mendel and Beyond - DNA and its Role in Heredity - From DNA to Protein: Genotype to Phenotype - The Genetics of Viruses and Prokaryotes - The Eukaryotic Genome and its Expression - Cell Signaling and Gene Expression - Recombinant DNA and Biotechnology - Molecular Biology and Medicine - Natural Defenses against Disease - PART THREE: DEVELOPMENT - Differential Gene Expression in Development - Animal Development: From Genes to Organism - Development and Evolutionary Change - PART FOUR: EVOLUTIONARY PROCESSES - The History of Life on Earth - The Mechanisms of Evolution - Species and their Formation - Constructing and Using Phylogenies - Molecular and Genomic Evolution - PART FIVE: THE EVOLUTION OF DIVERSITY - Bacteria and Archaea: The Prokaryotic Domains - Protists and the Dawn of the Eukarya - Plants without Seeds: From Sea to Land - The Evolution of Seed Plants - Fungi: Recyclers, Killers, and Plant Partners - Ancestors and Lophotrochozoans - Ecdysozoans: The Molting Animals - Deuterostomate Animals - PART SIX: THE BIOLOGY OF FLOWERING PLANTS - The Plant Body - Transport in Plants - Plant Nutrition - Plant Growth Regulation - Reproduction in Flowering Plants - Plant Responses to Environmental Challenges - PART SEVEN: THE BIOLOGY OF ANIMALS - Physiology, Homeostasis, and Temperature Regulation - Animal Hormones - Animal Reproduction - Neurons and Nervous Systems - Sensory Systems - The Mammalian Nervous System: Structure and Higher Functions - Effectors - Gas Exchange in Animals - Circulatory Systems - Animal Nutrition - Salt and Water Balance and Nitrogen Excretion - Animal Behavior - PART EIGHT: ECOLOGY AND BIOGEOGRAPHY - Behavioral Ecology - Population Ecology - Community Ecology - Biogeography - Conservation Biology - Earth Systems Science

Two different prompting procedures to teach visual and auditory discriminations to autistic children were compared. The first involved presenting an added cue as an extra-stimulus prompt. This required the child to respond to both prompt and training stimulus. The second involved the use of a within-stimulus prompt. This consisted of an exaggeration of the relevant component of the training stimulus and thus did not require that the child respond to multiple cues. The results indicated that (1) children usually failed to learn the discriminations without a prompt, (2) children always failed to learn when the extra-stimulus prompt was employed but usually did learn with the within-stimulus prompt, and (3) these findings were independent of which modality (auditory or visual) was required for the discrimination.

Haematophagous insects are frequently carriers of parasitic diseases, including malaria. The mosquito Anopheles gambiae is the major vector of malaria in sub-Saharan Africa and is thus responsible for thousands of deaths daily. Although the role of olfaction in A. gambiae host detection has been demonstrated, little is known about the combinations of ligands and odorant binding proteins (OBPs) that can produce specific odor-related responses in vivo. We identified a ligand, indole, for an A. gambiae odorant binding protein, AgamOBP1, modeled the interaction in silico and confirmed the interaction using biochemical assays. RNAi-mediated gene silencing coupled with electrophysiological analyses confirmed that AgamOBP1 binds indole in A. gambiae and that the antennal receptor cells do not respond to indole in the absence of AgamOBP1. This case represents the first documented instance of a specific A. gambiae OBP-ligand pairing combination, demonstrates the significance of OBPs in odor recognition, and can be expanded to the identification of other ligands for OBPs of Anopheles and other medically important insects.

Recent US corporate governance reforms introduced extensive regulations and guidelines for public corporations, particularly corporate boards. This article evaluates the extent to which empirical research on corporate boards and firm performance supports these reforms. Building on the meta‐analysis conducted by Zahra and Pearce (1989 ), we review 105 studies published between 1989 and 2005. We find most of the practices mandated by the Sarbanes‐Oxley Act of 2002, and the regulations issued by the New York Stock Exchange (NYSE) and the NASDAQ, had not been subject to prior study. Where board characteristics have been studied, we find limited guidance for policymakers on identifying governance practices that result in more effective firm performance. In an effort to increase the relevance of future research on boards and firm performance, we provide a framework on corporate boards.

Abstract An analytic solution to Skeist's copolymerization equation has been obtained for the case of binary copolymerization. From this solution, a differential copolymer composition equation is also derived. For given values of the reactivity ratios, these equations then permit the convenient calculation of expected binary copolymerization behavior as a function of conversion. Critical conditions leading to incompatible copolymerizations are also discussed.

Abstract We examine how charitable giving is influenced by who in the household is primarily responsible for giving decisions. Looking first at single-person households, we find men and women to have significantly different tastes for giving, setting up a potential conflict for married couples. We find that, with respect to total giving, married households tend to resolve these conflicts largely in favor of the husband's preferences. Bargaining over charitable giving, rather than letting one spouse take charge, is estimated to reduce giving by at least 6 percent. When the woman is the decisionmaker, she will still make a significantly different allocation of those charity dollars, preferring to give to more charities but to give less to each. Our results give new insights into both the demographics of charitable giving and the costliness of household bargaining.

Predicting when, where and with what magnitude climate change is likely to affect the fitness, abundance and distribution of organisms and the functioning of ecosystems has emerged as a high priority for scientists and resource managers. However, even in cases where we have detailed knowledge of current species' range boundaries, we often do not understand what, if any, aspects of weather and climate act to set these limits. This shortcoming significantly curtails our capacity to predict potential future range shifts in response to climate change, especially since the factors that set range boundaries under those novel conditions may be different from those that set limits today. We quantitatively examine a nine-year time series of temperature records relevant to the body temperatures of intertidal mussels as measured using biomimetic sensors. Specifically, we explore how a 'climatology' of body temperatures, as opposed to long-term records of habitat-level parameters such as air and water temperatures, can be used to extrapolate meaningful spatial and temporal patterns of physiological stress. Using different metrics that correspond to various aspects of physiological stress (seasonal means, cumulative temperature and the return time of extremes) we show that these potential environmental stressors do not always occur in synchrony with one another. Our analysis also shows that patterns of animal temperature are not well correlated with simple, commonly used metrics such as air temperature. Detailed physiological studies can provide guidance to predicting the effects of global climate change on natural ecosystems but only if we concomitantly record, archive and model environmental signals at appropriate scales.

Higher cognitive function depends on accurate detection and processing of subtle features of sensory stimuli. Such precise computations require neural circuits to be modulated over rapid timescales, yet this modulation is poorly understood. Brain-derived steroids (neurosteroids) can act as fast signaling molecules in the vertebrate central nervous system and could therefore modulate sensory processing and guide behavior, but there is no empirical evidence for this possibility. Here we report that acute inhibition of estrogen production within a cortical-like region involved in complex auditory processing disrupts a songbird's ability to behaviorally respond to song stimuli. Identical manipulation of local estrogen levels rapidly changes burst firing of single auditory neurons. This acute estrogen-mediated modulation targets song and not other auditory stimuli, possibly enabling discrimination among species-specific signals. Our results demonstrate a crucial role for neuroestrogen synthesis among vertebrates for enhanced sensory encoding. Cognitive impairments associated with estrogen depletion, including verbal memory loss in humans, may therefore stem from compromised moment-by-moment estrogen actions in higher-order cortical circuits.

The present paper is devoted to the space of minimal prime ideals of a more-or-less arbitrary commutative ring. Rings C(X) of continuous functions on topological spaces X appear only in §5 where they serve largely to provide significant examples.