Characteristics and Management Implications of the Spring Waterfowl Hunt in the Western Canadian Arctic, Northwest Territories

The species composition, timing of the harvest, sex, age, breeding status, and numbers of geese and swans shot during the spring hunt by residents of Tuktoyaktuk, Paulatuk, and Sachs Harbour, Northwest Territories were studied in each community hunting area for three consecutive years (1987 to 1990). Investigators visited hunters repeatedly in the field, conducting interviews and examining >=27% of the reported harvest. Snow geese (Anser caerulescens caerulescens) accounted for 70% of the harvest, followed by white-fronted geese (Anser albifrons frontalis, 19%), Canada geese (Branta canadensis hutchinsii, 5%), brant (Branta bernicla nigricans, 4%), tundra swans (Cygnus columbianus, 2%), and Ross' geese (Anser rossii, <1%). Sex ratios varied by species and community. Age ratios (yearlings per adult) also varied, and were inversely correlated with the size of the previous year's continental recreational harvest for white-fronted geese. Breeding status of geese with adult plumage varied, but was generally near 80% breeders. Average annual harvest of geese and swans were estimated at 5986 for Tuktoyaktuk, 1605 for Paulatuk, and 2790 for Sachs Harbour. Regional spring harvests, as a percent of continental harvests of regional populations, were 19% for lesser snow geese and 15% for white-fronted geese. Harvest levels require consideration in all stages of management of the resource, from local to continental. Action is required in Canada, through cooperative wildlife management mechanisms of the Inuvialuit Final Agreement and other land claims legislation, and through new regional bodies, to ensure that the spring harvest is incorporated into regional, national and international management of migratory birds.Durant trois années consécutives (de 1987 à 1990), on a étudié la composition des espèces, le moment des prélèvements, le sexe, l'âge, le statut de reproducteur et le nombre d'oies et de cygnes tués par balle au cours de la chasse printanière par les résidents de Tuktoyaktuk, de Paulatuk et de Sachs Harbour (Territoires du Nord-Ouest) dans la zone de chasse de chacune de ces communautés. Les chercheurs ont à plusieurs reprises rendu visite aux chasseurs sur le terrain, mené des entrevues et examiné >= 27 p. cent des prélèvements rapportés. L'oie des neiges (Anser caerulescens caerulescens) comptait pour 70 p. cent des prélèvements, suivie de l'oie à front blanc (Anser albifrons frontalis, 19 p. cent), de la bernache du Canada (Branta canadensis hutchinsii, 5 p. cent), de la bernache noire (Branta bernicla nigricans, 4 p. cent), du cygne siffleur (Cygnus columbianus, 2 p. cent), et de l'oie de Ross (Anser rossii, < 1 p. cent). Le taux mâle / femelle variait suivant les espèces et la communauté. Le taux entre les âges (nombre de petits d'un an par adulte) variait aussi, et était corrélé inversement pour l'oie à front blanc avec le nombre d'oiseaux prélevés au cours de la chasse sportive de l'année précédente à l'échelle du continent. Le statut de reproducteur des oies ayant un plumage d'adulte variait, mais en général, près de 80 p. cent étaient des oiseaux reproducteurs. On a évalué la moyenne des prélèvements annuels d'oies et de cygnes à 5986 pour Tuktoyaktuk, 1605 pour Paulatuk et 2790 pour Sachs Harbour. Les prélèvements printaniers régionaux, en tant que pourcentage des prélèvements de populations régionales à l'échelle du continent, étaient de 19 p. cent pour la petite oie des neiges et de 15 p. cent pour l'oie à front blanc. Il faut porter attention au niveau des prélèvements à tous les stades de la gestion des ressources, du niveau local au niveau du continent tout entier. Des mesures doivent être prises au Canada, par le biais des mécanismes de coopération de gestion de la faune contenus dans la Convention définitive des Inuvialuit et d'autres lois relatives aux revendications territoriales, ainsi que par le biais de nouvelles instances régionales, pour assurer que les prélèvements printaniers soient intégrés dans une gestion régionale, nationale et internationale des oiseaux migrateurs

The energetics of migration and reproduction of dusky Canada geese (Branta canadensis occidentalis)

Adult female Dusky Canada Geese were studied on the Copper River Delta, Alaska and in the Willamette Valley, Oregon during April through July, 1977 to 1979. Objectives of the research were to: 1) determine the chronology of use of protein and energy reserves in relation to four periods of reproduction defined as the migration, prelaying, egg laying and incubation periods, and 2) to assess the role of food in meeting energy requirements during these four periods. During the study, 162 geese were collected for composition analysis. Endogenous lipids were heavily utilized during migration, egg laying and incubation. Endogenous protein was important during egg laying and incubation. Food supplied about half of the energy requirements calculated for the migration period, all needs during prelaying, over 75% during egg laying and about one third of energy requirements during incubation. Food was most important for supplementing high' protein needs of laying geese and both protein and energy needs of geese during the last third of the incubation period when endogenous reserves were depleted. Although northern nesting geese have been assumed to be largely independent of food during prelaying through incubation, it was suggested that food is in fact proximately important, influencing both clutch size and patterns of energy use during incubation. Ultimately, the timing of nesting and clutch size of northern nesting geese may have evolved in response to the need for an optimal food supply about two-thirds of the way through incubation

Problems in Interpreting Unusually Large Burrows

Although marine burrows of unusually large dimensions have long been known in certain areas, they are probably much more widespread in the rock record than is generally recognized. Such burrows constitute a heterogeneous group, having little in common other than exceptional size. Yet their size alone unites them in difficulty of interpretation: e.g., densely spaced-dwelling burrows of combined dwelling-escape burrows as much as 12 cm in diameter and 5 m long; vertical dwelling burrows only 0.5 cm in diameter but up to 9 m long; possible escape structures as much as 24 cm in diameter and 3 m long, subsequently penetrated in some cases by secondary burrow-like structures. Numerous special problems are encountered in the study and interpretation of burrows of these extreme dimensions: (1) field exposure and accessibility, so that the full extent, or a large part, of the structures can be studied; (2) preservation of the burrows in continuity, not merely in places where they pass through certain beds or within concretion horizons; (3) the fossilization barrier ; our knowledge of comparable modern structures of similar dimensions or of the animals responsible for them is negligible; and (4) the possibility that certain of these unusual structures were formed by physical rather than organic processes; again, our criteria for comparisons are limited. The examples selected by us—from the Permian of Montana, Idaho, and Wyoming, the Cretaceous and Paleocene of northwestern Europe, and the Pleistocene of North Carolina—are intended primarily (1) to call additional attention to such intriguing structures, and (2) to illustrate some of the problems involved in interpreting their origin and function. Hopefully, future work will solve many of these problems

The Periodic Standing-Wave Approximation: Overview and Three Dimensional Scalar Models

The periodic standing-wave method for binary inspiral computes the exact numerical solution for periodic binary motion with standing gravitational waves, and uses it as an approximation to slow binary inspiral with outgoing waves. Important features of this method presented here are: (i) the mathematical nature of the ``mixed'' partial differential equations to be solved, (ii) the meaning of standing waves in the method, (iii) computational difficulties, and (iv) the ``effective linearity'' that ultimately justifies the approximation. The method is applied to three dimensional nonlinear scalar model problems, and the numerical results are used to demonstrate extraction of the outgoing solution from the standing-wave solution, and the role of effective linearity.Comment: 13 pages RevTeX, 5 figures. New version. A revised form of the nonlinearity produces better result

Spectral Classification and Luminosity Function of Galaxies in the Las Campanas Redshift Survey

We construct a spectral classification scheme for the galaxies of the Las Campanas Redshift Survey (LCRS) based on a principal component analysis of the measured galaxy spectra. We interpret the physical significance of our six spectral types and conclude that they are sensitive to morphological type and the amount of active star formation. In this first analysis of the LCRS to include spectral classification, we estimate the general luminosity function, expressed as a weighted sum of the type-specific luminosity functions. In the R-band magnitude range of -23 < M <= -16.5, this function exhibits a broad shoulder centered near M = -20, and an increasing faint-end slope which formally converges on an alpha value of about -1.8 in the faint limit. The Schechter parameterization does not provide a good representation in this case, a fact which may partly explain the reported discrepancy between the luminosity functions of the LCRS and other redshift catalogs such as the Century Survey (Geller et al. 1997). The discrepancy may also arise from environmental effects such as the density-morphology relationship for which we see strong evidence in the LCRS galaxies. However, the Schechter parameterization is more effective for the luminosity functions of the individual spectral types. The data show a significant, progressive steepening of the faint-end slope, from alpha = +0.5 for early-type objects, to alpha = -1.8 for the extreme late-type galaxies. The extreme late-type population has a sufficiently high space density that its contribution to the general luminosity function is expected to dominate fainter than M = -16. We conclude that an evaluation of type-dependence is essential to any assessment of the general luminosity function.Comment: 21 pages (LaTeX), 7 figures (Postscript). To appear in the Astrophysical Journal. The discussion of environmental dependence of luminosity functions has been shortened; the material from the earlier version now appears in a separate manuscript (astro-ph/9805197

Association of Genetic Variants With Primary Open-Angle Glaucoma Among Individuals With African Ancestry.

Importance:Primary open-angle glaucoma presents with increased prevalence and a higher degree of clinical severity in populations of African ancestry compared with European or Asian ancestry. Despite this, individuals of African ancestry remain understudied in genomic research for blinding disorders. Objectives:To perform a genome-wide association study (GWAS) of African ancestry populations and evaluate potential mechanisms of pathogenesis for loci associated with primary open-angle glaucoma. Design, Settings, and Participants:A 2-stage GWAS with a discovery data set of 2320 individuals with primary open-angle glaucoma and 2121 control individuals without primary open-angle glaucoma. The validation stage included an additional 6937 affected individuals and 14 917 unaffected individuals using multicenter clinic- and population-based participant recruitment approaches. Study participants were recruited from Ghana, Nigeria, South Africa, the United States, Tanzania, Britain, Cameroon, Saudi Arabia, Brazil, the Democratic Republic of the Congo, Morocco, Peru, and Mali from 2003 to 2018. Individuals with primary open-angle glaucoma had open iridocorneal angles and displayed glaucomatous optic neuropathy with visual field defects. Elevated intraocular pressure was not included in the case definition. Control individuals had no elevated intraocular pressure and no signs of glaucoma. Exposures:Genetic variants associated with primary open-angle glaucoma. Main Outcomes and Measures:Presence of primary open-angle glaucoma. Genome-wide significance was defined as P &lt; 5 × 10-8 in the discovery stage and in the meta-analysis of combined discovery and validation data. Results:A total of 2320 individuals with primary open-angle glaucoma (mean [interquartile range] age, 64.6 [56-74] years; 1055 [45.5%] women) and 2121 individuals without primary open-angle glaucoma (mean [interquartile range] age, 63.4 [55-71] years; 1025 [48.3%] women) were included in the discovery GWAS. The GWAS discovery meta-analysis demonstrated association of variants at amyloid-β A4 precursor protein-binding family B member 2 (APBB2; chromosome 4, rs59892895T&gt;C) with primary open-angle glaucoma (odds ratio [OR], 1.32 [95% CI, 1.20-1.46]; P = 2 × 10-8). The association was validated in an analysis of an additional 6937 affected individuals and 14 917 unaffected individuals (OR, 1.15 [95% CI, 1.09-1.21]; P &lt; .001). Each copy of the rs59892895*C risk allele was associated with increased risk of primary open-angle glaucoma when all data were included in a meta-analysis (OR, 1.19 [95% CI, 1.14-1.25]; P = 4 × 10-13). The rs59892895*C risk allele was present at appreciable frequency only in African ancestry populations. In contrast, the rs59892895*C risk allele had a frequency of less than 0.1% in individuals of European or Asian ancestry. Conclusions and Relevance:In this genome-wide association study, variants at the APBB2 locus demonstrated differential association with primary open-angle glaucoma by ancestry. If validated in additional populations this finding may have implications for risk assessment and therapeutic strategies

The use of interpretive phenomenological analysis in couple and family therapy research

This article proposes a research methodology that is newer to the field of couple and family therapy research called Interpretive Phenomenological Analysis (IPA). Researchers exploring couple and family therapy research continue to establish the efficacy of couple and family interventions in a context that favors a positivist view of phenomena. This research continues to be critical for establishing the role of couple and family therapy in the field of mental health as well as further clarifying which interventions are best for specific clinical issues and when. IPA offers researchers the opportunity to explore how couples and families make meaning of their experiences from an intersubjective perspective. Meaning making is central to understanding couples and families as well as part of the many clinical approaches to working with couples and families. Despite the importance of meaning, few research methodologies allow for this central concept in couple and family therapy to be the focus of exploration. The following article outlines one such methodology and the possible use of IPA in couple and family therapy research

GHQ increases among Scottish 15 year olds 1987–2006

BACKGROUND: Increases in a number of psychosocial disorders have been identified among Western youth in the second half of the Twentieth century. However findings are not consistent, trends are complex, and comparisons over time are hampered by methodological problems. METHODS: Data were drawn from three samples identical in respect of age (15 years), school year (final year of statutory schooling) and geographical location (the West of Scotland). Each sample was administered the 12-item General Health Questionnaire, a measure of self-report psychological distress, in 1987 (N = 505), 1999 (N = 2,196) and 2006 (N = 3,194). Analyses were conducted to examine changes in: GHQ 'caseness'; individual items; and factors, derived via confirmatory factor analysis representing (a) 'negative' and 'positive' items, and (b) 'anxiety and depression', 'loss of confidence or self-esteem' and 'anhedonia and social dysfunction'. RESULTS: Based on the standard (2/3) cut-off, 'caseness' rates in 1987, 1999 and 2006 were 12.7, 15.1 and 21.5% (males) and 18.8, 32.5 and 44.1% (females). Similar increases were observed with more stringent 'caseness' cut-offs. Examination of individual items showed some to have increased much more markedly over time than others. There were larger increases among females for all except two items and some evidence, among both genders, of steeper increases among 'negative' items compared with 'positive' ones. However, the differences in slope were very small compared with the overall increases in both types. CONCLUSIONS: Data from three samples identical in respect of age, school year and geographical location, show marked increases in GHQ-12 'caseness' among females between 1987 and 1999 and among both males and females between 1999 and 2006. Although slightly steeper increases in 'negative' items raise the possibility that endorsing such symptoms may have become more acceptable, these were small in comparison with increases in all dimensions of psychological distress. The next step is to identify causal explanations for the increases reported here

Host Genetic Background Strongly Influences the Response to Influenza A Virus Infections

The genetic make-up of the host has a major influence on its response to combat pathogens. For influenza A virus, several single gene mutations have been described which contribute to survival, the immune response and clearance of the pathogen by the host organism. Here, we have studied the influence of the genetic background to influenza A H1N1 (PR8) and H7N7 (SC35M) viruses. The seven inbred laboratory strains of mice analyzed exhibited different weight loss kinetics and survival rates after infection with PR8. Two strains in particular, DBA/2J and A/J, showed very high susceptibility to viral infections compared to all other strains. The LD50 to the influenza virus PR8 in DBA/2J mice was more than 1000-fold lower than in C57BL/6J mice. High susceptibility in DBA/2J mice was also observed after infection with influenza strain SC35M. In addition, infected DBA/2J mice showed a higher viral load in their lungs, elevated expression of cytokines and chemokines, and a more severe and extended lung pathology compared to infected C57BL/6J mice. These findings indicate a major contribution of the genetic background of the host to influenza A virus infections. The overall response in highly susceptible DBA/2J mice resembled the pathology described for infections with the highly virulent influenza H1N1-1918 and newly emerged H5N1 viruses