National Center for Ecological Analysis and Synthesis

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4901-4910 of 6350
  1. Publication

    Evolutionary significant units (ESU) table

    This table was shared in conjunction with a working group project to assess the usefulness of algorithms and quantitative approaches to measuring biodiversity in terms of 'taxonomic distinctiveness' or 'independent evolutionary units'. The group evaluated whether and how phylogenetic information can be used to measure species value. Specifically, they analyzied the effects of sample size, topology, branch lengths and model of evolutionary change on various quantitative measures of phylogenetic diversity.

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  2. Publication

    Foraging trait variation in Ambystoma maculatum

    Predator-prey interactions often vary markedly across natural landscapes. One explanation for this variation is local genetic differentiation of prey traits due to selection from predators. Here, I evaluated the relative contributions of selection from a gape-limited predator (Ambystoma opacum) and spatial location within a larger landscape to explanations of variation in foraging, growth, and survival in 10 populations of temporary pond breeding salamander larvae (Ambystoma maculatum).

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  3. Publication

    Geochemistry of Colorado Spring

    This data set contains a full suite of geochemistry, dissolved organic carbon, and spectral qualities of 21 stream sites in the Colorado Rockies collected from 5-2003 to 10-2003.

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  4. Publication

    Geographic range occupancy of North American birds

    Although the geographic range is a fundamental unit of analysis for many macroecological and biogeographical studies, as a representation of the spatial distribution of individuals it is clearly a scale-dependent abstraction. As any amateur naturalist realizes, a species is not guaranteed to be present at every point within the range delimited by a field guide. Geographically extensive survey data such as the North American Breeding Bird Survey (BBS) allow the characterization of distribution patterns within the geographic range.

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  5. 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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  6. 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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  7. 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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  8. 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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  9. 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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  10. 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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