National Center for Ecological Analysis and Synthesis

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4911-4920 of 6313
  1. Publication

    Global analysis of nitrogen and phosphorus limitation

    The cycles of the key nutrient elements nitrogen (N) and phosphorus (P) have been massively altered by anthropogenic activities. Thus, it is essential to understand how photosynthetic production across diverse ecosystems is, or is not, limited by N and P. Via a large-scale meta-analysis of experimental enrichments, we show that P limitation is equally strong across these major habitats and that N and P limitation are equivalent within both terrestrial and freshwater systems.

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  2. Publication

    Hurricane related demography of Ardisia escallonioides (FL)

    Demographic rates of a subtropical undestory shrub in seven different states of canopy openness and habitat transition estimates for states of canopy openness in subtropical hardwood hammocks of extreme southern Florida. Demographic rates were estimated from empirical data at 4 sites after Hurricane Andrew, a category 5 hurricane (Aug 24, 1992). Habitat dynamics were estimated from the historical record combined with empirical data on the rate canopy closure (from fisheye photographs).

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  3. Publication

    Incidence of the rust Triphragmium ulmariae on Filipendula ulmaria in the Skeppsvik archipelago, Sweden

    The data set provides information on the incidence and severity of a rust fungus Triphragmium ulmariae occurring in populations of the herbaceous perennial Filipendula ulmaria growing on a range of islands in the Skeppsvik archipelago, northern Sweden. These data, together with information on the size of individual host populations, is being used to monitor temporal and spatial dynamics in a natural plant pathogen - host metapopulation system. See Smith, David L., Ericson, Lars & Burdon, Jeremy J.

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  4. Publication

    Intersection of Calwater River Basins and ECOMAP subsections

    This data set contains an intersection of Calwater River Basins and USDA Forest Service ECOMAP subsections, manually edited to remove slivers and small polygons. The coverage was created as a candidate system of statewide planning units for the California Legacy Project.

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  5. Publication

    Lake Baikal plankton

    This data set was collected at roughly 7-10 day intervals approximately 1 km offshore from Bolshie Koty on Lake Baikal. Depths span 0 - 250 m with regularity and frequently deeper. Zooplankton and phytoplankton are identified to species and lifestage where applicable. Temperature and Secchi depth are available for full time series, chlorophyll a and primary productivity are available since 1979. The data set has been under the direction of Mikhail Kozhov, Olga Kozhova and Lyubov Izmest'eva since roughly 1945. Eugene Silow stewards the data.

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  6. Publication

    Large herbivore censuses from Kruger Park

    The data set includes count totals subdivided among four regions across almost the entire 19,500 km2 extent of the Kruger National Park, for 11 large herbivore species, from "Ecological Aerial Surveys". Surveys were conducted annually from 1977 to 1996 using standard methods, but park coverage was complete only from 1980 to 1993. A finer regional breakdown of these data is also available, but contains some errors and omissions. There are supporting data on the age and sex structure of samples of these populations covering 1983-1996. Rainfall data are also available.

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  7. Publication

    Barro Colorado Island 50 ha forest dynamics plot, Panama

    Barro Colorado Island (BCI) has been the focus of intensive research on lowland tropical moist forest since 1923, and its flora is better known than any site of comparable size throughout the tropics. The Smithsonian Tropical Research Institute and Princeton University established the first Forest Dynamics Plot at BCI in 1980, as part of its comprehensive program of research in tropical forest biology, which includes plant physiology, canopy biology, and animal ecology. BCI Plot Data, Tables of Abundance, Plot Species and Soil Maps data are available.

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  8. Publication

    Lizards in Baja California

    Following the work of Soule and colleagues, we assembled a data set of Uta spp. phenotypic and genetic variation across a set of islands located in the Sea of Cortez. To this data we added community and habitat characteristics of these islands.

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  9. Publication

    Global Seagrass Trajectories Database Compiled October 2006

    Our goal was to establish a global database of seagrass trajectories, i.e. reported, quantitative changes in extent showing decline, increase, or stability over time. We compiled existing quantitative data on seagrass areal extent, density, percent cover, and/or biomass from published studies, reports, websites, online databases, and unpublished sources.

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  10. Publication

    Main causes for discrepancies in species classifications

    Decisions about species conservation status have critical implications for allocation of public and private funding, land use planning decisions, and regulatory actions. A broad range of methods are used to classify species conservation status at a variety of geographic scales (e.g., local, national, international). Different methods produce very different results, yet there is no rationale or benchmark for judging their adequacy or appropriateness. Existing systems also are incomplete because they lack rules that allow decisions to be made when the data are uncertain.

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