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Population Segments (population + segment)

Distribution by Scientific Domains
Life Sciences60%
Medical Sciences20%
Humanities and Social Sciences20%

Kinds of Population Segments

  • distinct population segment
    		•

    Selected Abstracts

    Distinct Population Segments and Congressional Intent: Reply to Waples

    CONSERVATION BIOLOGY, Issue 2 2000
    David S. Pennock
    No abstract is available for this article. [source]

    A Perspective on Developing and Marketing Food Products to Meet Individual Needs of Population Segments

    COMPREHENSIVE REVIEWS IN FOOD SCIENCE AND FOOD SAFETY, Issue 4 2004
    I. Mehrotra
    ABSTRACT The promise of evolving research in the area of genomics suggests a move toward an individualized or customized approach to the diet. However, these advances in research do not come without complexities and raise much tougher questions, such as how will the food industry view this as an opportunity? What challenges will it face? Will it play a pivotal role? [source]

    Restoration of genetic connectivity among Northern Rockies wolf populations

    MOLECULAR ECOLOGY, Issue 20 2010
    MARK HEBBLEWHITE
    Probably no conservation genetics issue is currently more controversial than the question of whether grey wolves (Canis lupus) in the Northern Rockies have recovered to genetically effective levels. Following the dispersal-based recolonization of Northwestern Montana from Canada, and reintroductions to Yellowstone and Central Idaho, wolves have vastly exceeded population recovery goals of 300 wolves distributed in at least 10 breeding pairs in each of Wyoming, Idaho and Montana. With >1700 wolves currently, efforts to delist wolves from endangered status have become mired in legal battles over the distinct population segment (DPS) clause of the Endangered Species Act (ESA), and whether subpopulations within the DPS were genetically isolated. An earlier study by vonHoldt et al. (2008) suggested Yellowstone National Park wolves were indeed isolated and was used against delisting in 2008. Since then, wolves were temporarily delisted, and a first controversial hunting season occurred in fall of 2009. Yet, concerns over the genetic recovery of wolves in the Northern Rockies remain, and upcoming District court rulings in the summer of 2010 will probably include consideration of gene flow between subpopulations. In this issue of Molecular Ecology, vonHoldt et al. (2010) conduct the largest analysis of gene flow and population structure of the Northern Rockies wolves to date. Using an impressive sampling design and novel analytic methods, vonHoldt et al. (2010) show substantial levels of gene flow between three identified subpopulations of wolves within the Northern Rockies, clarifying previous analyses and convincingly showing genetic recovery. [source]

    Using Population Segmentation to Provide Better Health Care for All: The "Bridges to Health" Model

    THE MILBANK QUARTERLY, Issue 2 2007
    JOANNE LYNN
    The model discussed in this article divides the population into eight groups: people in good health, in maternal/infant situations, with an acute illness, with stable chronic conditions, with a serious but stable disability, with failing health near death, with advanced organ system failure, and with long-term frailty. Each group has its own definitions of optimal health and its own priorities among services. Interpreting these population-focused priorities in the context of the Institute of Medicine's six goals for quality yields a framework that could shape planning for resources, care arrangements, and service delivery, thus ensuring that each person's health needs can be met effectively and efficiently. Since this framework would guide each population segment across the institute's "Quality Chasm," it is called the "Bridges to Health" model. [source]

    Genetic Data and the Listing of Species Under the U.S. Endangered Species Act

    CONSERVATION BIOLOGY, Issue 5 2007
    SYLVIA M. FALLON
    Acta de Especies en Peligro de E. U. A.; decisiones de enlistado; segmento poblacional distinto Abstract:,Genetic information is becoming an influential factor in determining whether species, subspecies, and distinct population segments qualify for protection under the U.S. Endangered Species Act. Nevertheless, there are currently no standards or guidelines that define how genetic information should be used by the federal agencies that administer the act. I examined listing decisions made over a 10-year period (February 1996,February 2006) that relied on genetic information. There was wide variation in the genetic data used to inform listing decisions in terms of which genomes (mitochondrial vs. nuclear) were sampled and the number of markers (or genetic techniques) and loci evaluated. In general, whether the federal agencies identified genetic distinctions between putative taxonomic units or populations depended on the type and amount of genetic data. Studies that relied on multiple genetic markers were more likely to detect distinctions, and those organisms were more likely to receive protection than studies that relied on a single genetic marker. Although the results may, in part, reflect the corresponding availability of genetic techniques over the given time frame, the variable use of genetic information for listing decisions has the potential to misguide conservation actions. Future management policy would benefit from guidelines for the critical evaluation of genetic information to list or delist organisms under the Endangered Species Act. Resumen:,La información genética se está convirtiendo en un factor influyente para determinar sí una especie, subespecie y segmentos poblacionales distintos califican para ser protegidos por el Acta de Especies en Peligro de E. U. A. Sin embargo, actualmente no hay estándares o lineamientos que definan como deben utilizar información genética las agencias federales que administran el acta. Examiné las decisiones de enlistado basadas en información genética tomadas en un período de 10 años (febrero 1996,febrero 2006). Hubo una amplia variación en los datos genéticos utilizados para informar las decisiones de enlistado en términos de cuáles genomas (mitocondrial vs. nuclear) fueron muestreados y el número de marcadores (o técnicas genéticas) y los loci evaluados. En general, las agencias federales identificaron diferencias genéticas entre unidades taxonómicas putativas o poblaciones dependiendo del tipo y cantidad de datos genéticos. Los estudios que se basaron en marcadores genéticos múltiples tuvieron mayor probabilidad de identificar distinciones, y esos organismos tuvieron mayor probabilidad de recibir protección, que los estudios basados en un solo marcador genético. Aunque los resultados pueden, en parte, reflejar la disponibilidad de técnicas genéticas para decisiones de enlistado en el período analizado, el uso variable de información genética para la toma de decisiones puede desinformar acciones de conservación. Las políticas de manejo futuras se beneficiarían de directrices para la evaluación crítica de información genética para enlistar o quitar de la lista a organismos bajo el Acta de Especies en Peligro. [source]

    Populism as political communication style: An empirical study of political parties' discourse in Belgium

    EUROPEAN JOURNAL OF POLITICAL RESEARCH, Issue 3 2007
    JAN JAGERS
    Within the broad discussion about populism and its relationship with extreme-right, this article is confined to three topics: a conceptual, an epistemological and an empirical issue. First, taking a clear position in the ongoing definition struggle, populism is defined primarily as a specific political communication style. Populism is conceived of as a political style essentially displaying proximity of the people, while at the same time taking an anti-establishment stance and stressing the (ideal) homogeneity of the people by excluding specific population segments. Second, it is pointed out that defining populism as a style enables one to turn it into a useful concept that has too often remained vague and blurred. Third, drawing on an operational definition of populism, a comparative discourse analysis of the political party broadcasts of the Belgian parties is carried out. The quantitative analysis leads to a clear conclusion. In terms of the degree and the kinds of populism embraced by the six political parties under scrutiny, the extreme-right party Vlaams Blok behaves very differently from the other Belgian parties. Its messages are a copybook example of populism. [source]

    Site fidelity and the demographic implications of winter movements by a migratory bird, the harlequin duck Histrionicus histrionicus

    JOURNAL OF AVIAN BIOLOGY, Issue 3 2006
    Samuel A. Iverson
    Understanding the degree of demographic connectivity among population segments is increasingly recognized as central to the fields of population ecology and conservation biology. However, delineating discrete population units has proven challenging, particularly for migratory birds as they move through their annual cycle. In this study, radio telemetry was used to assess movement rates among habitats by harlequin ducks Histrionicus histrionicus during the non-breeding season in Prince William Sound, Alaska. A total of 434 females were outfitted with radio transmitters over six years of data collection, and their signals tracked by aircraft. Using a spatially nested design, it was determined that 75% of radioed females remained in the bay or coastline area where they were originally trapped, 94% remained on the same island or mainland region of Prince William Sound where they began the winter period, and 98% remained within the 4500 km2 study area as a whole. Home range analyses corroborated these findings, indicating that the scale of individual movements was small, with 95% kernel home range estimates averaging only 11.5±2.2 km2. A simple demographic model, which incorporated estimates for population size, survival, and movement rates, was used to infer the degree of independence among population segments. Immigrant females were found to contribute little to population numbers in most areas, accounting for only 4% of the adult female population at a scale of approximately 100 km2. These results have important implications for the scale of conservation action for the species and demonstrate that winter movements can have a strong influence local population dynamics. [source]

    Harlequin duck Histrionicus histrionicus population structure in eastern Nearctic

    JOURNAL OF AVIAN BIOLOGY, Issue 2 2002
    Serge Brodeur
    During May 1996 and April 1997, eight harlequin duck males were captured and fitted with satellite transmitters while migrating along the shores of Forillon National Park, Québec, Canada. Another 17 males were equipped with satellite transmitters in river systems of eastern Hudson Bay, Ungava Bay and northern Labrador in June 1997 and 1998. Our objectives were to determine relationships between breeding, moulting and wintering areas, and to determine whether distinct population segments existed among harlequin ducks in eastern North America. All birds tracked from Forillon migrated to Labrador. Moulting areas were identified for six birds. Forillon males were followed to the eastern North American major wintering site in Maine. Males captured in northern Québec and Labrador migrated to moult and winter in south-western Greenland. Our data suggest the presence of two demographically distinct population segments in eastern North America, perhaps originating from the Pleistocene glacial refuge in western Greenland and south of the Laurentide ice sheet in eastern Canada or United States. [source]

    Coat condition of ringtailed lemurs, Lemur catta at Berenty Reserve, Madagascar: I. differences by age, sex, density and tourism, 1996,2006

    AMERICAN JOURNAL OF PRIMATOLOGY, Issue 3 2009
    Alison Jolly
    Abstract An index of coat condition can be a non-invasive tool for tracking health and stress at population level. Coat condition in ringtailed lemurs, Lemur catta, was recorded during September,November birth seasons of 1996, 1997, 1999, and 2001,2006 at Berenty Reserve, Madagascar. Condition was scored on a scale from 0: full, fluffy coat with guard hairs present, to 5: half or more of body hairless. Adult males did not differ overall from adult females. Coats were worse in adults than in 2-year-old subadults; 1-year-old juveniles were intermediate. Mothers and adult males lost coat condition as the season progressed: non-mother females maintained condition. Years 1999,2002 scored better coats than either 1996,1997 or 2003,2006. Lemurs in high population density areas had worse coats than in natural forest, but tourist presence had less effect than density. Monitoring coat condition in an apparently healthy population reveals differences between population segments, and in a forest fragment with limited immigration or emigration it can track progressive changes, correcting impressions of progressive improvement or degradation over time. Above all it gives a baseline for response to climate changes or eventual pathology. Am. J. Primatol. 71:191,198, 2009. © 2008 Wiley-Liss, Inc. [source]

    Physical activity advice in the primary care setting: results of a population study in New Zealand

    AUSTRALIAN AND NEW ZEALAND JOURNAL OF PUBLIC HEALTH, Issue 3 2006
    Karen Croteau
    Objectives: To determine the prevalence of physical activity advice, including the Green Prescription (a physical activity scripting scheme), given in the primary care setting, and the characteristics of New Zealanders who receive such advice. Method: Questions from a 2003 national postal survey (n=8,291), ,Obstacles to Action', were examined. The survey was designed to identify population segments to target for physical activity interventions. Binary logistic regression was used to examine independent factors associated with receiving a physician or practice nurse recommendation to increase physical activity and receiving a Green Prescription. Results: Overall, 13.3% of the sample reported receiving physical activity advice while 3.0% reported receiving a Green Prescription from their general practitioner or practice nurse in the last year. Those more likely to receive physical activity advice were Maori or Pacific, overweight or obese, sedentary, or suffering chronic disease. Results were similar for Green Prescription advice. When controlling for these and other demographics, physical inactivity was not related to the odds of receiving a Green Prescription. Conclusions: One out of every eight New Zealanders reported being given general physical activity advice in the primary care setting. While the physically inactive but otherwise healthy were not specifically targeted, the Green Prescription was more likely to be given on the basis of existing chronic conditions related to physical inactivity and other high-risk populations. Implications: Primary care settings provide an important opportunity to promote physical activity for New Zealand adults. While those most at risk are more likely to receive such advice, there are many more that may benefit. [source]