Bioindicators to assess

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  • Field and laboratory studies were conducted to evaluate the use of bacterial growth on aquatic insects as a metric for determining the existence of nutrient impacts in wetlands. Results from field investigations indicated that elevated concentrations of nitrate and phosphate...

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  • Our current level of long-term and comparative information on estuaries in many cases prohibits objective determination of the status and trends among these ecosystems. The way to resolve this situation is to develop and evaluate estuarine environmental indicators that will permit objective and meaningful evaluation of estuaries. However, this effort far exceeds the ability of one or a few well-intentioned scientists.

    pdf0p 951628473 07-05-2012 34 5   Download

  • Defi ning, gathering, and disseminating international statistics is a collective effort of many people and organizations. The indicators presented in World Development Indicators are the fruit of decades of work at many levels, from the fi eld workers who administer censuses and household surveys to the committees and working parties of the national and international statistical agencies that develop the nomenclature, classifi cations, and standards fundamental to an international statistical system.

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  • The different sources of potential confounding in time series studies of air pollution and mortality can be broadly classified as either measured or unmeasured. Important measured confounders include weather variables such as temperature and dewpoint temperature. Daily temperature measurements are readily available for metropolitan areas in the USA and numer- ous studies have demonstrated a relationship between temperature and mortality which is gen- erally positive for warm summer days and negative for cold winter days (e.g. Curriero et al. (2002)).

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