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Articles 1 - 6 of 6
Full-Text Articles in Geography
Impacts Of Climate Warming And Permafrost Thaw On The Riverine Transport Of Nitrogen And Phosphorus To The Kara Sea, Karen E. Frey, James W. Mcclelland, Robert M. Holmes, Laurence G. Smith
Impacts Of Climate Warming And Permafrost Thaw On The Riverine Transport Of Nitrogen And Phosphorus To The Kara Sea, Karen E. Frey, James W. Mcclelland, Robert M. Holmes, Laurence G. Smith
Geography
Measurements of nitrogen and phosphorus (N and P) concentrations from previously unstudied streams and rivers throughout west Siberia suggest that climate warming and/or associated permafrost thaw will likely amplify the transport of N and P to the Kara Sea and adjacent Arctic Ocean. We present concentrations of dissolved organic nitrogen (DON), ammonium (NH4-N), nitrate (NO3-N), total dissolved nitrogen (TDN), and total dissolved phosphorus (TDP) from 96 streams and rivers within the Ob'-Iriysh, Nadym, and Pur river drainage basins. The sampled sites span ∼106 km2, a large climatic gradient (∼55°N-68°N), and include 41 cold, permafrost-influenced and 55 warm, permafrost-free watersheds. Concentrations …
Bureacratizing Ethics: Institutional Review Boards And Participatory Research, Deborah Martin
Bureacratizing Ethics: Institutional Review Boards And Participatory Research, Deborah Martin
Geography
This paper provides a brief history of regulatory research ethics, as embodied in Institutional Review Boards in the United States. The purpose is to foster common disciplinary understanding of the origin and purpose of IRBs, and to identify the core conflict between the philosophies of participatory action research and regulatory ethics. That conflict centers on the contradictory language and associated understandings of research "subjects" and "participants". I suggest a need for more disciplinary engagements around this conflict, to foster more open ethical debates and competencies among geographers. © Deborah G. Martin, 2007; journal compilation © ACME Editorial Collective, 2007.
Household Land Management And Biodiversity: Secondary Succession In A Forest-Agriculture Mosaic In Southern Mexico, Rinku Roy Chowdhury
Household Land Management And Biodiversity: Secondary Succession In A Forest-Agriculture Mosaic In Southern Mexico, Rinku Roy Chowdhury
Geography
This study evaluates anthropogenic and ecological dimensions of secondary forest succession in Mexico's southern Yucatán peninsular region, a hotspot of biodiversity and tropical deforestation. Secondary succession in particular constitutes an ecologically and economically important process, driven by and strongly influencing land management and local ecosystem structures and dynamics. As agents of local land management, smallholding farmers in communal, i.e., ejido lands affect rates of forest change, biodiversity, and sustainability within and beyond their land parcels. This research uses household survey's and land parcel mapping in two ejidos located along the buffer of the Calakmul Biosphere Reserve to analyze how household …
The Association Between Distance To Water Pipes And Water Bodies Positive For Anopheline Mosquitoes (Diptera: Culicidae) In The Urban Community Of Malindi, Kenya, Daniel E. Impoinvil, Joseph Keating, Rinku Roy Chowdhury, Robert Duncan, Gabriel Cardenas, Sajjad Ahmad, Charles M. Mbogo, John I. Githure, John C. Beier
The Association Between Distance To Water Pipes And Water Bodies Positive For Anopheline Mosquitoes (Diptera: Culicidae) In The Urban Community Of Malindi, Kenya, Daniel E. Impoinvil, Joseph Keating, Rinku Roy Chowdhury, Robert Duncan, Gabriel Cardenas, Sajjad Ahmad, Charles M. Mbogo, John I. Githure, John C. Beier
Geography
The increasing risk of mosquito-borne diseases in African urban environments has been partly attributed to failed planning and resource underdevelopment. Though engineered systems may reduce mosquito proliferation, there are few studies describing this relationship. This study investigates how engineered systems such as roads and piped water systems affect the odds of anopheline immatures (i.e., larvae and pupae) occurring in water bodies located in Malindi, Kenya. Anopheles gambiae s.s. (Giles), An. arabiensis (Patton), and An. merus (Dointz) were identified in urban Malindi, with Anopheles gambiae s.s. being the predominant species identified. The Breslow-Day test was used to explore interactions among independent …
Africa And The Global Carbon Cycle, Christopher A. Williams, Niall P. Hanan, Jason C. Neff, Robert J. Scholes, Joseph A. Berry, A. Scott Denning, David F. Baker
Africa And The Global Carbon Cycle, Christopher A. Williams, Niall P. Hanan, Jason C. Neff, Robert J. Scholes, Joseph A. Berry, A. Scott Denning, David F. Baker
Geography
The African continent has a large and growing role in the global carbon cycle, with potentially important climate change implications. However, the sparse observation network in and around the African continent means that Africa is one of the weakest links in our understanding of the global carbon cycle. Here, we combine data from regional and global inventories as well as forward and inverse model analyses to appraise what is known about Africa's continental-scale carbon dynamics. With low fossil emissions and productivity that largely compensates respiration, land conversion is Africa's primary net carbon release, much of it through burning of forests. …
How Well Do We Know Northern Land Cover? Comparison Of Four Global Vegetation And Wetland Products With A New Ground-Truth Database For West Siberia, Karen E. Frey, Laurence C. Smith
How Well Do We Know Northern Land Cover? Comparison Of Four Global Vegetation And Wetland Products With A New Ground-Truth Database For West Siberia, Karen E. Frey, Laurence C. Smith
Geography
An unprecedented collection of 2161 geolocated, irregularly spaced field observations of land cover spanning ∼106 km2 throughout West Siberia suggests that currently available land cover classification products are remarkably poor indicators of vegetation type and water body extent in this northern Welland environment. The ground-truth data are compared with (1) the Global Land Cover Characteristics database derived from Advanced Very High Resolution Radiometer data (GLCC.AVHRR), (2) the Global Land Cover Classification derived from Moderate Resolution Imaging Spectroradiometer data (GLCC.MODIS), (3) the Global Lakes and Wetlands Database (GLWD), and (4) the West Siberian Lowland Peatland Database (WSLPD) using: (1) all land …