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  1. Article: Did land protection in Silicon Valley reduce the housing stock

    Denning, Carrie A / Mcdonald, Robert I / Christensen, Jon

    Biological conservation. 2010 May, v. 143, no. 5

    2010  

    Abstract: One widely asserted proposition is that land protection in a metropolitan region can contribute to a scarcity of housing by reducing the total housing stock. However, much land protection occurs on land that is less suitable for development, as slopes ... ...

    Abstract One widely asserted proposition is that land protection in a metropolitan region can contribute to a scarcity of housing by reducing the total housing stock. However, much land protection occurs on land that is less suitable for development, as slopes are too sleep or because the site is too wet. An alternate hypothesis is that development in lands with these characteristics would likely occur at a lower density, and contribute little to housing stock. This study examines these two competing hypotheses for the southern portion of the San Francisco Bay Area, known as the Silicon Valley. We mapped conservation and urban development in the study area from World War II to the present. We created a counterfactual map, using a regression-based model to examine a “what if” proposition - what would the density of development have been in currently preserved lands if they had been developed like other topographically-similar unprotected sites on the landscape? In our study area, there are currently 790000 housing units. If conserved lands, which total 47000ha, were developed there would likely only be an additional 51000 housing units. Most conserved land is either too wet to be developed or is of steep enough slope that housing density would likely be low. Our results suggest that land protection had a relatively minor role in limiting the total housing stock of the region.
    Keywords land values ; conservation areas ; slope ; urban areas ; urban development ; regression analysis ; econometric models ; California
    Language English
    Dates of publication 2010-05
    Size p. 1087-1093.
    Publishing place Kidlington, Oxford: Elsevier Science Ltd.
    Document type Article
    ISSN 0006-3207
    DOI 10.1016/j.biocon.2010.01.025
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: The implications of current and future urbanization for global protected areas and biodiversity conservation

    Mcdonald, Robert I / Kareiva, Peter / Forman, Richard T.T

    Biological conservation. 2008 June, v. 141, no. 6

    2008  

    Abstract: Due to human population growth and migration, there will be nearly 2 billion new urban residents by 2030, yet the consequences of both current and future urbanization for biodiversity conservation are poorly known. Here we show that urban growth will ... ...

    Abstract Due to human population growth and migration, there will be nearly 2 billion new urban residents by 2030, yet the consequences of both current and future urbanization for biodiversity conservation are poorly known. Here we show that urban growth will have impacts on ecoregions, rare species, and protected areas that are localized but cumulatively significant. Currently, 29 of the world's 825 ecoregions have over one-third of their area urbanized, and these 29 ecoregions are the only home of 213 endemic terrestrial vertebrate species. Our analyses suggest that 8% of terrestrial vertebrate species on the IUCN Red List are imperiled largely because of urban development. By 2030, 15 additional ecoregions are expected to lose more than 5% of their remaining undeveloped area, and they contain 118 vertebrate species found nowhere else. Of the 779 rare species with only one known population globally, 24 are expected to be impacted by urban growth. In addition, the distance between protected areas and cities is predicted to shrink dramatically in some regions: for example, the median distance from a protected area to a city in Eastern Asia is predicted to fall from 43km to 23km by 2030. Most protected areas likely to be impacted by new urban growth (88%) are in countries of low to moderate income, potentially limiting institutional capacity to adapt to new anthropogenic stresses on protected areas. In short, trends in global ecoregions, rare species, and protected areas suggest localized but significant biodiversity degradation associated with current and upcoming urbanization.
    Keywords biodiversity ; cities ; conservation areas ; ecoregions ; human growth ; income ; prediction ; urbanization ; vertebrates ; East Asia
    Language English
    Dates of publication 2008-06
    Size p. 1695-1703.
    Publishing place Kidlington, Oxford: Elsevier Science Ltd.
    Document type Article
    ISSN 0006-3207
    DOI 10.1016/j.biocon.2008.04.025
    Database NAL-Catalogue (AGRICOLA)

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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